JP2010026862A - Ordering system, information management system, method for preventing order information from disappearing, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ordering system which assures correctness of order information even in occurrence of power interruption in the middle of writing to a volatile memory. <P>SOLUTION: An order information processing part 12 receives order information from an order input device 20 and registers the order information to sequential data in a RAM 13. The order information processing part 12 registers in an index table in the RAM 13 an index showing the tail position of information whenever information is registered in the sequential data. When a host device 10 is restarted, the order information processing part 12 obtains the tail information of the sequential data on the basis of the index in the index table, and recovers the host device 10 on the basis of the tail information. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an ordering system used in the restaurant industry, etc., an information management system for preventing loss of information when the system is turned off, and an order information loss prevention method for preventing loss of order information when the ordering system is turned off. And the program.

2. Description of the Related Art Conventionally, in restaurants and the like, an ordering system is used in which a customer attendant inputs an order using an order input device and transmits the order to a host device in the kitchen by wireless communication. Usually, the host device is operated by power from a commercial power source. Therefore, it is necessary to avoid the loss of the order information written in the volatile memory in the host device when a power failure or a cable connected to the power source is dropped. Therefore, conventionally, an uninterruptible power supply is provided, and the loss of information in the volatile memory is prevented by switching the power supply to the uninterruptible power supply when the power is turned off.
In addition, the technique of patent document 1 and the patent document 2 is disclosed as an emergency stop processing method at the time of the power failure in a host apparatus.
JP-A-7-220180 JP 2006-235868 A

In the technique of Patent Document 1, the volatile memory of the host device is provided with a power backup, and the order information stored in the volatile memory is prevented from being lost. However, there is a possibility that the order information stored in the volatile memory may be lost due to a power failure during the writing to the volatile memory, and it is impossible to guarantee that the order information is error-free. there were.
In the technique of Patent Document 2, the ordering system includes a plurality of host devices, and the plurality of host devices store the same information, so that even if a failure occurs in a certain host device, another host device is operating. Therefore, the ordering system prevents the loss of order information. However, when the power is cut off due to a power failure or the like, the operation of all the host devices is stopped. Since the host device has a power backup, the order information stored in the volatile memory can be prevented from being lost. In this case, as in Patent Document 1, a power interruption occurs during writing to the volatile memory. For example, the order information stored in the volatile memory may be lost, and it may not be possible to guarantee that the order information is free of errors.
The present invention has been made in view of the above points, and an object of the present invention is to provide an ordering system that can prevent order information from being lost even if a power failure occurs during writing to a volatile memory. There is.

  The present invention has been made in order to solve the above-described problem. An order input device that receives an order input from a user and transmits order information including a slip number and indicating the content of the order, and the order input device. An accounting apparatus that receives the order information from the host, manages the order information, performs accounting for the order, generates accounting information including the slip number and indicates completion of the accounting, and transmits the accounting information And an output device that generates output information based on information received from the host device and outputs the output information, wherein the host device is the order input device, the accounting device, or the A communication means for communicating with the output device, and the order information or the accounting information received from the order input device or the accounting device are sequentially registered in the storage means. Registration information registration means, and the order management information indicating the order information or the accounting information integrated for each slip number in association with the slip number is registered in the order management information storage means, and the registration is completed. Order management information registration means for registering the order management information registration identification information shown in the sequential storage means, and a reception completion notification indicating that the registration of the order management information is completed to the order input device or the accounting device, A reception completion notification transmission means for registering the reception completion notification transmission identification information indicating that the transmission of the reception completion notification is completed in the sequential storage means, and a slip information output command indicating the contents of the order is transmitted to the output device. A slip output command transmission means, and a slip output identification indicating that the output of the slip information is completed after receiving a notification indicating completion of output of the slip information from the output device. A slip output completion notification receiving means for registering information in the sequential storage means, and an index for registering an index indicating the position of information at the end of the sequential storage means in the index storage means each time information is registered in the sequential storage means Processing procedure information indicating the order of processing executed by the registration means, the reception information registration means, the order management information registration means, the acceptance completion notification transmission means, the slip output command transmission means, and the slip output completion notification reception means; Processing procedure storage means stored in advance, and when the host device is restarted, the tail information of the sequential storage means is acquired based on the index stored in the index registration means, and the tail information and the processing Based on the procedure information, the process completed before the restart is determined, and the process after the completed process is executed to execute the process of the host device. And a recovery means for performing recovery.

  The host device according to the present invention includes a spare index registration unit that registers the index in the spare index storage unit, and an error of the index every time the index is registered in the index storage unit or the spare index storage unit. An error in the index is detected by an index error detection code registration means for registering an error detection code for detecting the error in the storage means in which the index is registered, and the error detection code of the index storage means and the spare index storage means. When an error is detected in the index of the index storage means, the index of the reserve index storage means is copied to the index storage means, and an error is detected in the index of the reserve index storage means Characterized in that it comprises a and an index recovery means for copying the index of the index storage means to said pre-index storage unit.

  Further, the sequential storage means of the present invention is such that order management information registration identification information is registered after order information, and order management information registration identification information is registered after accounting information. After the registration of the order management information registration identification information is completed, the order management information is registered in the preliminary order management information storage means in association with the slip number, and the preliminary order management information registration identification information indicating that the registration is completed. Preliminary order management information registration means for registering in the sequential storage means, and at the time of restarting the host device, acquiring the tail information of the sequential storage means based on the index stored in the index registration means, When the information at the end of the sequential storage means is order information or accounting information, the order management information storage means stores the order management information in the preliminary order management information storage means. When the information at the end of the sequential storage means is order management information registration identification information, the order management information in the order management information storage means is copied to the preliminary order management information storage means, and the preliminary order management Order management information recovery means for registering information registration identification information in the sequential storage means.

  Further, the host device of the present invention is connected to an AC power source, divides the power of the AC power source into a predetermined voltage, and supplies the divided power to each processing means of the own device operating with the power, When power supply from the AC power supply is interrupted, the voltage dividing power output is interrupted to interrupt the output voltage to zero, and the first voltage dividing means is connected to the AC power supply. The voltage is divided into a voltage different from the voltage output by the voltage dividing means, and the divided power is supplied to each processing means of the own apparatus including at least each of the registration means operated by the power, and the power supply from the AC power supply And the second voltage dividing means that the voltage outputted after a predetermined time becomes 0 after the time when the voltage outputted by the first voltage dividing part becomes 0, When a voltage drop occurs in the first voltage divider The power-off detecting means for outputting the voltage drop occurrence notice of the second voltage dividing means, and the voltage output by the second voltage dividing means from the time when the voltage drop occurrence notice is output in advance becomes zero. Either the remaining power time, which is the time until the time, or the information registered in the sequential storage unit, is registered in the sequential storage unit, and the minimum time during which an index related to the information can be registered in the index storage unit Registration time storage means for storing the required registration time, and information to the storage means after the registration permission time, which is a time obtained by subtracting the required registration time from the remaining power time after obtaining the voltage drop occurrence notice. Registration control means for prohibiting new registration, and each registration means starts registration of information to be registered in the sequential storage means within the sequential storage means within the registration permission time. It is characterized in.

  The present invention also includes an input device that receives input of information from a user and transmits input information that is input information, and a host device that receives the input information from the input device and manages the input information The host device includes: a communication unit that communicates with the input device or the output device; and input information that is received from the input device and that sequentially registers the input information in a storage unit One or a plurality of input information processing means for performing processing on the input information, registering processing completion identification information indicating completion of the processing in the sequential storage means, and the sequential storage means An index registration means for registering an index indicating the position of the last information of the sequential storage means in the index storage means each time information is registered; Processing procedure storage means for storing processing procedure information indicating the order of processing executed by the input information processing means, and the sequential storage based on the index stored in the index registration means when the host device is restarted The information at the end of the means is acquired, the process completed before restart is determined based on the information at the end and the processing procedure information stored in the processing procedure storage means, and the processing after the completed processing is determined. And a recovery means for recovering the host device by executing.

  The present invention also receives an order input from a user, generates order information including a slip number, transmits the order information, receives the order information from the order input device, and receives the order. A host device that manages information, and performs accounting for the order, generates accounting information that includes the slip number and indicates completion of the accounting, transmits the accounting information, and information received from the host device. An order information loss prevention method in an ordering system including output information based on an output device and outputting the output information, wherein the communication means of the host device is the order input device, the accounting device, or the output The reception information registration means of the host device communicates with the device, the order information received from the order input device or the accounting device, or the Total information is sequentially registered in the storage means, and the order management information registration means of the host device associates with the slip number and manages the order information or the accounting information integrated for each slip number as order management information. Registering in the information storage means, registering the order management information registration identification information indicating that the registration has been completed in the sequential storage means, and receiving completion notification transmission means of the host device has completed registration of the order management information A reception completion notification indicating that the reception completion notification is transmitted to the order input device or the accounting device, and registration completion notification transmission identification information indicating that the transmission of the reception completion notification is completed is registered in the sequential storage unit. The slip output command transmission means transmits a slip information output command to the output device, and the slip information output completion notification reception means of the host device receives the previous information from the output device. After receiving the notification indicating the completion of the output of the slip information, the slip output identification information indicating that the output of the slip information is completed is registered in the sequential storage means, and the index registration means of the host device is stored in the sequential storage means. Each time the information is registered, an index indicating the position of the end of the information is registered in the index storage unit, and the recovery unit of the host device stores the index stored in the index registration unit when the host device is restarted The end information of the sequential storage means is acquired based on the information, and the host device is restored based on the end information.

  The present invention also receives an order input from a user, generates order information including a slip number, transmits the order information, receives the order information from the order input device, and receives the order. A host device for managing information, accounting for the order, generating accounting information including the slip number and indicating completion of the accounting, and transmitting the accounting information; and information received from the host device A communication unit that communicates with the order input device, the accounting device, or the output device, the computer of the host device in an ordering system that generates output information based on the output device and outputs the output information; Received information registration means for sequentially registering the order information or the accounting information received in the storage means received from the input device or the accounting device, the slip The order information or the accounting information integrated for each voucher number is registered in the order management information storage means as order management information, and the order management information registration identification information indicating that the registration is completed Order management information registration means for registering in the sequential storage means, a reception completion notification indicating that the registration of the order management information has been completed is transmitted to the order input device or the accounting device, and transmission of the reception completion notification is completed Reception completion notification transmission means for registering the reception completion notification transmission identification information indicating the information in the sequential storage means, slip output command transmission means for transmitting a slip information output command to the output device, and output of the slip information from the output device After receiving notification indicating completion, slip information output completion notification for registering slip output identification information indicating completion of output of the slip information in the sequential storage means Each time information is registered in the sequential storage means, an index registration means for registering an index indicating the end position of the information in the index storage means, and when the host device is restarted, the index registration means stores the index. The program for obtaining information at the end of the sequential storage means based on the index and for causing the host device to recover based on the information at the end.

According to the present invention, since the index is registered in the index storage unit after the registration in the sequential storage unit is completed, the registration up to the last information of the sequential storage unit indicated by the index is completed, and there is an error in the information. It can be guaranteed that there is no. As a result, even if the power is cut off during the registration to the sequential storage means, the order information, the accounting information, and the order management information can be guaranteed.
In addition, according to the present invention, it is possible to guarantee that there is no error in the index registered in the index storage unit by adding an error detection code to the index and further including a spare index storage unit. As a result, even if the power is cut off during registration in the index storage means, there is no error in the index related to the information that has been registered, so order information, accounting information, and order management information that are not missing are guaranteed. be able to.
In addition, according to the present invention, it is further provided with a preliminary order management information storage means, and the order management information registered in the order management information storage means is guaranteed to be error-free by managing the order management information twice. be able to. As a result, even if the power is cut off during the registration to the order management information storage means, it is possible to guarantee order management information without any loss.
In addition, according to the present invention, by using two voltage dividers with different power generation times and guaranteeing the time that information can be registered, each storage unit completes information registration without loss when power is reduced. Therefore, it can be ensured that there is no error in the stored information. Thus, it is possible to prevent the occurrence of power interruption during the registration to the storage means, and thus it is possible to guarantee order information, transaction information, and order management information that are free from defects.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic block diagram showing a configuration of an ordering system according to an embodiment of the present invention. The ordering system 1 includes a host device 10, an order input device 20, an accounting device 30, and an output device 40. The host device 10 receives the order information from the order input device 20 and manages the order information. The order input device 20 receives an order input from a user and transmits order information to the host device 10. The order information is information including a slip number, an order information identification number, an order input device number, and order contents. Here, the order information identification number is a unique identification number that the order input device 20 assigns to each order information created by itself.
The accounting device 30 receives the order information from the host device 10 based on the slip number, performs accounting for the order indicated by the order information, and transmits the accounting information to the host device 10. The accounting information is information including a slip number.
The output device 40 receives order information from the host device 10, creates slip information (output information) from the order information, and outputs the slip. Although the host device 10 may be provided in the output device 40, for convenience of explanation, the host device 10 and the output device 40 will be described as different devices here.

  The host device 10 includes a communication unit 11 (communication unit), an order information processing unit 12, a RAM (Random Access Memory) 13, a power backup 14, a power cut detection unit 15 (power cut detection unit), and a voltage dividing unit. 16 (first voltage dividing section) and a voltage dividing section 17 (second voltage dividing section). The communication unit 11 communicates with the order input device 20, the accounting device 30, and the output device 40. The RAM 13 sequentially holds order information, accounting information, and flags (order management information registration identification information, preliminary order management information registration identification information, acceptance completion notification transmission identification information, and slip output identification information) used for recovery from power failure. Sequential data (sequential storage means), an index table (index storage means) that holds an index indicating the end position of the sequential data, a spare index table (spare index storage means), a slip number, order information, and accounting information An order management table (order management information storage means) and a preliminary order management table (preliminary order management information storage means) that store the order management information integrated for each number in association with each other are stored. The power backup 14 supplies power to the RAM 13 when the power is cut off. The power-off detector 15 detects a voltage drop in the voltage divider 16 and notifies the order information processor 12 of a voltage drop notice in the voltage divider 17. The voltage dividing sections 16 and 17 are power supplies that obtain a 100 V power supply from the commercial power supply 50 (AC power supply), convert the voltages to 24 V and 5 V, respectively, and output them. The power output from the voltage dividing unit 16 is input to each processing unit that operates at a voltage of 24V of the host device 10, and the power output from the voltage dividing unit 17 is input to each processing unit that operates at a voltage of 5V from the host device 10. Is done. At least the order information processing unit 12 operates with the power output from the voltage dividing unit 17.

  The order information processing unit 12 performs the following processes (1) to (8). (1) Processing for sequentially registering order information and transaction information acquired by the communication unit 11 (reception information registration means), (2) Order management table and preliminary order management table based on order information and transaction information Processing for updating information (order management information registration means, preliminary order management information registration means), (3) Processing for sending acceptance completion notification to order input device 20 and accounting device 30 via communication unit 11 (acceptance completion notification transmission) Means), (4) processing for transmitting a slip output command to the output device 40 via the communication unit 11 and receiving a slip information output completion notification (slip output command transmitting means, slip information output completion notification receiving means), (5 ) Processing for registering indexes in the index table and the spare index table (index registration means, spare index registration means), (6) index table Processing for assigning an error detection code to the information in the spare and spare index table (index error detection code registration means), (7) Obtaining a voltage drop notice and registering it in the RAM 13 with the power of the voltage divider 17 registered in advance Waiting for a time during which information can be reliably registered, and processing for prohibiting registration of information in the RAM 13 (registration time storage means, registration control means) after elapse of time during which information can be reliably registered in the RAM 13 (8) pre-stored Processing for restoring the host device 10 based on the processing procedure information indicating the order of processing executed by the order information processing unit 12 and the information stored in the RAM 13 (processing procedure storage means, order management information recovery means) Index recovery means, recovery means).

FIG. 2 is a diagram illustrating an example of sequential data stored in the RAM.
The sequential data is data in which information acquired by the host device 10 from the ordering device 20 and the accounting device 30 and information representing the history of processing in the device itself are listed. As shown in FIG. 2, the sequential data includes sequentially order information, accounting information, order management information registration completion flag (order management information registration identification information), preliminary order management information registration completion flag (preliminary order management information registration identification information). ), A reception completion notification flag (reception completion notification transmission identification information), and a slip output completion flag (slip output identification information) are registered. The order management information registration completion flag and the preliminary order management information registration completion flag indicate that the registration of the order management information is completed in the order management table and the preliminary order management table, respectively. The reception completion notification flag indicates that a reception completion notification has been transmitted to the order input device 20 or the accounting device 30. The slip output completion flag indicates that the output device 40 has output a slip.

FIG. 3 is a diagram showing an order management table stored in the RAM.
The order management table is a table that holds order management information obtained by integrating information acquired from the ordering device 20 and the accounting device 30 for each slip number. The order management information is used when the accounting apparatus 30 performs accounting. As shown in FIG. 3, in the order management table, a slip number, order contents, and an accounting flag are registered for each customer. The accounting flag indicates that the accounting device 30 has finished accounting processing when it is ON, and indicates that accounting processing is not being performed when it is OFF. The configuration of the preliminary order management table is the same as the order management table.

FIG. 4 is a diagram showing an index table stored in the RAM.
As shown in FIG. 4, an index is registered in the index table for each sequential data registration, and the error detection code is updated each time the index is registered. The index is data indicating a logical address of each piece of information of sequential data. The error detection code is a code used when detecting whether an error exists in the data of the entire index table including the error detection code. The configuration of the spare index table is the same as that of the index table.

Next, the operation of the ordering system 1 at the normal time will be described.
FIG. 5 is a sequence diagram showing order information registration processing when the ordering system is normal.
When a user inputs an order to the order input device 20 and the order input device 20 receives an order transmission by pressing an order confirmation button (not shown) or the like, the order input device 20 receives the input order information as a host device. 10 (step S1). The order information processing unit 12 of the host device 10 acquires the transmitted order information via the communication unit 11. The order information processing unit 12 registers the acquired order information in the sequential data in the RAM 13 (step S2). Details of the registration process for sequential data will be described later. When the registration process to the sequential data is completed, the order information processing unit 12 registers and updates the order contents stored in the order information in the order management table and the preliminary order management table in the RAM 13 (step S3). Details of the update processing of the order management table and the preliminary order management table will be described later. When the update processing of the order management table and the preliminary order management table is completed, the order information processing unit 12 transmits a reception completion notification indicating that the reception of the order information has been completed to the order input device 20 via the communication unit 11 (step S4). If the order input device 20 does not receive the reception completion notification for a predetermined time that has been registered in advance after transmitting the order information in step S1, it determines that transmission of the order information to the host device 10 has failed, Returning to step S1, order information is transmitted again.

When the order information processing unit 12 of the host device 10 transmits the reception completion notification in step S4, the reception completion notification flag is registered in the sequential data in the RAM 13 (step S5). When the registration of the acceptance completion notification flag is completed, the order information processing unit 12 transmits a slip output command to the output device 40 (step S6). The slip output command includes order information. When receiving the slip output command, the output device 40 generates slip information based on the order information stored in the slip output command. Then, the output device 40 outputs the generated slip information (step S7). Next, when the slip information is output, the output device 40 transmits a slip output completion notification to the host device 10 (step S8). The order information processing unit 12 of the host device 10 acquires the transmitted slip output completion notification via the communication unit 11. When receiving the slip output completion notification, the order information processing unit 12 registers the slip output completion flag in the sequential data in the RAM 13 (step S9).
If the order input device 20 does not receive the order reception completion notification for some reason despite the host device 10 transmitting the order reception completion notification to the order input device 20 in step S4, the order input device 20 Returning to step S1, order information is transmitted again. The host device 10 has received the order information identification number and the order input device number of the received order information that respectively match the order information identification number and the order input device number in the order information of the sequential data, and has received the order information. If the flag has already been registered, only the order acceptance completion notification transmission process in step S4 is performed.

  In this embodiment, the order information processing unit 12 transmits a reception completion notification indicating that the reception of the order information has been completed to the order input device 20 in step S4, and sequentially registers the notification flag in the data, An example in which a slip output command is transmitted from the order information processing unit 12 to the output device 40 in S6 is shown. However, the present invention is not limited to this, and the following processing procedure may be used. That is, the order information processing unit 12 registers and updates the order contents stored in the order information in step S3 in the order management table and the preliminary order management table in the RAM 13. When the order management table and the preliminary order management table are updated, the order information processing unit 12 transmits a slip output command to the output device 40 in step S6. Next, the order information processing unit 12 receives a slip output completion notification from the output device 40 in step S9 and registers a slip output completion flag in the sequential data. When the slip output completion flag is registered, the order information processing unit 12 transmits a reception completion notification to the order input device 20 in step S4, and registers the reception completion notification flag in the sequential data in the RAM 13 in step S5. Also good.

FIG. 6 is a sequence diagram showing a transaction information registration process when the ordering system is normal.
When the user inputs a slip number into the accounting device 30 and receives a request for sending an order management information request by an accounting start button (not shown) or the like, the accounting device 30 issues an order management information request storing the input slip number. Is transmitted to the host device 10 (step S11). The order information processing unit 12 of the host device 10 acquires the transmitted order management information request via the communication unit 11. The order information processing unit 12 acquires order management information associated with the slip number stored in the acquired order management information request from the order management table in the RAM 13. The order information processing unit 12 transmits the acquired order management information to the accounting apparatus 30 (step S12). The accounting device 30 calculates a fee based on the order contents of the received order management information, and performs accounting processing (step S13).

When the user executes the accounting process with the accounting device 30 and accepts the completion of accounting by an accounting confirmation button (not shown) or the like, the accounting device 30 transmits accounting information to the host device 10 (step S14). The order information processing unit 12 of the host device 10 acquires the transmitted transaction information via the communication unit 11. The order information processing unit 12 registers the acquired transaction information in the sequential data in the RAM 13 (step S15). When the registration process to the sequential data is completed, the order information processing unit 12 updates the accounting flag of the order management table and the preliminary order management table in the RAM 13 from OFF to ON (step S16). When the update processing of the order management table and the preliminary order management table is completed, the order information processing unit 12 transmits a reception completion notification indicating that the reception of the accounting information has been completed to the order input device 20 via the communication unit 11 (step). S17). If the accounting device 30 does not receive the acceptance completion notification for a predetermined time after transmitting the accounting information in step S14, the accounting device 30 determines that the transmission of the accounting information to the host device 10 has failed, Returning to S14, the accounting information is transmitted again.
When the order information processing unit 12 of the host device 10 transmits the reception completion notification in step S17, the reception completion notification flag is registered in the sequential data in the RAM 13 (step S18).
If the accounting apparatus 30 does not receive the accounting information reception completion notification for some reason despite the fact that the host apparatus 10 has transmitted the accounting information reception completion notification to the accounting apparatus 30 in step S17, the accounting apparatus 30 performs step S14. Return to and send the accounting information again. When the slip number of the received accounting information matches the slip number of the order information of the sequential data and the receipt completion notification flag of the accounting information has already been registered, the host device 10 receives the accounting information acceptance completion notification in step S17. Only send processing.

Next, the operation of the host device 10 when the power is turned off will be described.
FIG. 7 is a diagram illustrating the operation of the host device 10 when the power is turned off.
When the commercial power supply 50 is cut off due to a power failure, cable disconnection, or the like, the output voltage becomes zero due to the interruption of the power output divided by the voltage divider 16 after the time T1 has elapsed since the power cut. When the output voltage of the voltage dividing unit 16 becomes 0, the power interruption detection unit 15 monitors the output voltage of the voltage dividing unit 16 for a time T2 after the output voltage of the voltage dividing unit 16 becomes 0. Thereby, it is determined whether or not the voltage is temporarily lowered due to a cause different from the power interruption, such as a connection failure of the cable connecting the commercial power supply 50 and the voltage dividing unit 16. If there is no increase in the output voltage during time T2 after the output voltage of the voltage dividing unit 16 becomes 0, the power-off detection unit 15 determines that the commercial power source 50 is powered off, and the order information processing unit 12 Notify the voltage drop notice. When the output voltage rises during time T2 after the output voltage of the voltage divider 16 becomes 0, the power-off detector 15 determines that the voltage is temporarily lowered. In the case of a temporary voltage drop, the output voltage of the voltage dividing unit 17 does not become 0, so that a voltage drop notice is not notified.
Upon obtaining the voltage drop notice, the order information processing unit 12 waits for a time (registration permission time) T5 during which information can be reliably registered in the RAM 13 with the output power of the voltage dividing unit 17. The time T5 is registered in the order information processing unit 12 in advance, and the time T3 to T1, T2 from when the commercial power supply 50 is turned off until the output voltage becomes 0 due to the interruption of the power output divided by the voltage dividing unit 17 This is a time calculated by subtracting the time (registration required time) T4 required to complete the registration of information in the RAM 13. The values of T1 to T4 used for calculating T5 are measured in advance. Here, the time T4 is a time required to write information to the sequential data in the RAM 13, register the index in the index table and the spare index table, and update the error detection code. At this time, the time T4 is expected to vary depending on the type and amount of information written to the sequential data in the RAM 13. Therefore, for example, information is written to sequential data in the RAM 13, the index is registered in the index table and the spare index table, and the time required to update the error detection code is measured in advance for each type of information. In order to reliably complete writing of long information, a time longer than the measurement time of the information is adopted as T4.
The order information processing unit 12 sets the new registration prohibition flag stored in the order information processing unit 12 indicating that new registration of information to the RAM 13 is prohibited after the time T5 has elapsed from the voltage drop notice acquisition from OFF to ON. The new registration prohibition flag indicates that new registration of information in the RAM 13 is permitted when OFF, and indicates that new registration of information in the RAM 13 is prohibited when ON. If the new registration prohibition flag is switched from OFF to ON during registration of information in the RAM 13, the information registration process is continued. After the time T4 elapses after the new registration prohibition flag is turned ON, the output voltage of the voltage dividing unit 17 becomes 0, and the operation of the host device 10 is stopped.

Details of the update process of the order management table and the preliminary order management table in the order information registration process and the accounting information registration process will be described below.
FIG. 8 is a flowchart showing the update process of the order management table and the preliminary order management table.
When the update process of the order management information is started, the order information processing unit 12 of the host device 10 first determines whether new registration of information in the RAM 13 is prohibited by the new registration prohibition flag stored in the order information processing unit 12. (Step S31). If registration in the RAM 13 is prohibited because the new registration prohibition flag is ON, information is not registered in the RAM 13 and the subsequent processing is stopped. This is to prevent loss of information during registration due to the output power of the voltage divider 17 becoming 0 during registration of information in the RAM 13.
If it is determined in step S31 that registration in the RAM 13 is not prohibited because the new registration prohibition flag is OFF, the order information processing unit 12 updates the order management information in the order management table in the RAM 13 (step S32). In the case of order information registration processing, the order contents in the order management table are updated. In the case of accounting information registration processing, the accounting flag in the order management table is updated. When the update of the order management table is completed, the order information processing unit 12 registers the order management information registration completion flag in the sequential data in the RAM 13 (step S33). The order management information registration completion flag indicates that the update of the order management table is completed by being registered. When the registration to the sequential data is completed, the order information processing unit 12 updates the preliminary order management table (step S34). In the case of the order information registration process, the order contents in the preliminary order management table are updated. In the case of the accounting information registration process, the accounting flag in the preliminary order management table is updated. When the update of the preliminary order management table is completed, the order information processing unit 12 registers the preliminary order management information registration completion flag in the sequential data in the RAM 13 (step S35). The order management information registration completion flag indicates that the update of the preliminary order management table is completed by being registered.
Order management information is managed in duplicate in the order management table and the preliminary order management table. Even if a voltage drop occurs during registration, updating of either the order management table or the preliminary order management table is completed. Therefore, data loss can be prevented in either the order management table or the preliminary order management table. In other words, when a voltage drop occurs during the update of the preliminary order management table, the order management table has been updated, so the information in the order management table can be used. If a voltage drop occurs during the update of the order management table, the information in the preliminary order management table that has been updated last time remains without loss, so this information can be used. Thereby, even when the update time of the order management information exceeds the time T4, information loss can be prevented by copying the information of the table without information loss to the table with information loss. Therefore, there is no limit on the update size of the order management information.

Details of the registration process for sequential data in the order information registration process and the accounting information registration process will be described below.
FIG. 9 is a flowchart showing a registration process for sequential data. Information for performing the registration process to sequential data includes order information, accounting information, order management information registration flag, preliminary order management information registration flag, acceptance completion notification flag, and slip output completion flag.
When the registration process to the sequential data is started, the order information processing unit 12 of the host device 10 first determines whether the registration of information in the RAM 13 is prohibited by the new registration prohibition flag stored in the order information processing unit 12 ( Step S41). If registration in the RAM 13 is prohibited because the new registration prohibition flag is ON, information is not registered in the RAM 13 and the subsequent processing is stopped.
If it is determined in step S41 that registration in the RAM 13 is not prohibited because the new registration prohibition flag is OFF, the order information processing unit 12 registers information in the sequential data in the RAM 13 (step S42). When the registration to the sequential data is completed, the order information processing unit 12 acquires the logical address at the end of the sequential data, and registers an index indicating the logical address at the end of the sequential data in the index table of the RAM 13 (step S43). When the registration to the index table is completed, the order information processing unit 12 updates the error detection code in the index table (step S44). When the update of the error detection code is completed, the order information processing unit 12 sequentially registers the last index of the data in the spare index table of the RAM 13 (step S45). When registration in the spare index table is completed, the order information processing unit 12 updates the error detection code in the spare index table (step S46).
If registration of information in the RAM 13 is not prohibited in step S41, the output voltage of the voltage divider 17 does not become zero at least for the time T4 described above. As described above, the time T4 is the time required to write information to the sequential data in the RAM 13, register the index in the index table and the spare index table, and update the error detection code. By starting the registration, it is ensured that the output voltage of the voltage dividing unit 17 does not become zero until the processing of steps S42 to S46 is completed.

Hereinafter, the operation of the host apparatus 10 at the time of restart after the occurrence of power interruption will be described.
FIG. 10 is a flowchart showing the operation of the host apparatus 10 at the time of restart.
When the host apparatus 10 is restarted after the power failure occurs, the order information processing unit 12 acquires the error detection code from the index table of the RAM 13, and the error detection code and the index table information are obtained again by the error code calculation process. An error is detected by collating with the calculated code, and the presence or absence of an error is determined (step S51). If it is determined that there is an error in the index table, the index of the spare index table is copied (copied) to the index table (step S52). Here, the reason why error detection of the spare index table is not performed will be described. The fact that there is an error in the index table is because a power interruption occurred during registration of the index table in step 43. For this reason, since the power is cut off before registration in the spare index table, it is guaranteed that there is no error in the spare index table without error detection.
When it is determined in step S51 that there is no error in the index table, the order information processing unit 12 acquires an error detection code from the spare index table in the RAM 13, detects an error in the spare index table, and determines whether there is an error (step) S53). If it is determined that there is an error in the spare index table, the index of the index table is copied to the spare index table (step S54).
It is necessary to write information in sequential data of the RAM 13, register the index in the index table and the spare index table, and update the error detection code by the process of determining whether or not registration is prohibited in the RAM 13 in step S41 described above. Since a sufficient time T4 is secured, registration in the index table and the spare index table can be completed during T4. This ensures that the index table and the spare index table are not in error. However, when a failure occurs in the power-off detection unit 15 and the voltage dividing unit 17, the output voltage of the voltage dividing unit 17 may become 0 earlier than the required registration time after prohibiting registration in the RAM 13. For this reason, by performing error detection through the processing in steps S51 to S54, it is possible to reliably guarantee an index even when the power-off detector 15 and the voltage divider 17 are out of order.

 If the index of the spare index table is copied to the index table by step S52, or the index of the index table is copied to the spare index table by step S54, or if it is determined that there is no error in the spare index table by step S53, the order information processing The unit 12 acquires an index from the index table. Based on the logical address of the sequential data indicated by the acquired index, information at the end of the sequential data in the RAM 13 is acquired (step S55). Next, the order information processing unit 12 searches the index in ascending order, and acquires the order information or the accounting information (hereinafter referred to as a processing target) registered last in the sequential data (step S56). Here, it is assumed that the indexes are registered in the index table in descending order. The order information processing unit 12 performs recovery processing based on the information at the end of the acquired sequential data and the acquired processing target (step S57). Details of the recovery process in step S57 will be described below.

FIG. 11 is a table showing a recovery processing method based on the processing target and information at the end of the sequential data.
In the case where the processing target acquired in step S56 is order information, when the information at the end of the sequential data acquired in step S55 is order information, the host device 10 interrupts the processing when registration of the order information is completed. . Therefore, there is a possibility that the voltage of the voltage dividing unit 17 becomes 0 during registration of the order management table, and the order management information in the order management table is damaged. Therefore, the order information processing unit 12 first copies the order management information in the preliminary order management table in the RAM 13 to the order management table in the RAM 13. Thereby, the order management information in the order management table can be returned to the state before the start of the order management information registration process. After copying the order management information, the order information processing unit 12 deletes the order information at the end of the sequential data. Since the order input device 20 has not received the order information acceptance completion notification, the order input device 20 returns to step S1 and transmits the order information again. Thereby, the interrupted process can be resumed.
When the processing object acquired in step S56 is order information, when the information at the end of the sequential data acquired in step S55 is an order management information registration completion flag, the host device 10 performs processing when the update of the order management table is completed. Is interrupted. Therefore, there is a possibility that the voltage of the voltage dividing unit 17 becomes 0 during registration of the preliminary order management table, and the order management information in the preliminary order management table is damaged. Therefore, the order information processing unit 12 first copies the order management information in the order management table in the RAM 13 to the preliminary order management table in the RAM 13. Thereby, the order management information in the preliminary order management table can be updated to a state in which the registration process of the order management information is completed. After copying the order management information, a preliminary order management information registration completion flag is registered in the sequential data of the RAM 13. When the registration processing to the sequential data is completed, the order information processing unit 12 does not transmit the order reception completion notification in step S4, but transmits the reception completion notification, the slip output command transmission by the processing in step S5 and subsequent steps, The flag is registered in the sequential data associated therewith. In this case, since the order input device 20 has not received the order acceptance completion notification, the order input device 20 returns to step S1 and transmits the order information again. The host device 10 has received the order information identification number and the order input device number of the received order information that respectively match the order information identification number and the order input device number in the order information of the sequential data, and has received the order information. If the flag has already been registered, only the order acceptance completion notification transmission process in step S4 is performed. Thereby, the interrupted process can be resumed and completed.
When the processing target acquired in step S56 is order information, when the information at the end of the sequential data acquired in step S55 is a preliminary order management information registration completion flag, the order information processing unit 12 notifies the order reception completion in step S4. Is not transmitted, the reception completion notification is transmitted, the slip output command is transmitted, and the flag is sequentially registered in the data accordingly. When the order information retransmitted from the order input device 20 is received, that is, the order information identification number and the order input device number of the received order information are respectively the order information identification number and the order input device in the order information of the sequential data. If the number matches the number and the reception completion flag of the order information has already been registered, the host device 10 performs only the order reception completion notification transmission processing in step S4. Thereby, the interrupted process can be resumed and completed.
In the case where the processing target acquired in step S56 is order information, when the information at the end of the sequential data acquired in step S55 is a reception completion notification flag, the order information processing unit 12 performs a slip output command by the processing from step S6 Transmission and registration of the flag to the sequential data associated therewith. Thereby, the interrupted process can be resumed and completed.
When the processing target acquired in step S56 is order information, when the information at the end of the sequential data acquired in step S55 is a slip output completion flag, the slip has already been issued, so there is no need to perform recovery processing.

In the case where the processing object acquired in step S56 is accounting information, when the information at the end of the sequential data acquired in step S55 is accounting information, the host device 10 suspends processing when the registration of accounting information is completed. . Therefore, there is a possibility that the voltage of the voltage dividing unit 17 becomes 0 during registration of the order management table, and the order management information in the order management table is damaged. Therefore, the order information processing unit 12 first copies the order management information in the preliminary order management table in the RAM 13 to the order management table in the RAM 13. Thereby, the order management information in the order management table can be returned to the state before the start of the order management information registration process. After copying the order management information, the order information processing unit 12 deletes the transaction information at the end of the sequential data. Since the accounting apparatus 30 has not received the accounting information reception completion notification, the accounting apparatus 30 returns to step S14 and transmits the accounting information again. Thereby, the interrupted process can be resumed.
When the processing target acquired in step S56 is accounting information, when the information at the end of the sequential data acquired in step S55 is an order management information registration completion flag, the host device 10 performs processing when the update of the order management table is completed. Is interrupted. Therefore, there is a possibility that the voltage of the voltage dividing unit 17 becomes 0 during registration of the preliminary order management table, and the order management information in the preliminary order management table is damaged. Therefore, the order information processing unit 12 first copies the order management information in the order management table in the RAM 13 to the preliminary order management table in the RAM 13. Thereby, the order management information in the preliminary order management table can be updated to a state in which the registration process of the order management information is completed. After copying the order management information, a preliminary order management information registration completion flag is registered in the sequential data of the RAM 13. When the registration processing to the sequential data is completed, the order information processing unit 12 registers the flag to the sequential data at step S18 without transmitting the reception completion notification at step S17. In this case, since the accounting apparatus 30 has not received the accounting acceptance completion notification, the accounting apparatus 30 returns to step S14 and transmits the accounting information again. When the slip number of the received accounting information matches the slip number in the accounting information of the sequential data and the receipt completion flag of the accounting information has already been registered, the host device 10 sends an accounting acceptance completion notification in step S17. Only send processing. Thereby, the interrupted process can be resumed and completed.
When the processing object acquired in step S56 is accounting information, when the information at the end of the sequential data acquired in step S55 is a preliminary order management information registration completion flag, the order information processing unit 12 receives an acceptance completion notification in step S17. Without transmission, the flag is registered in the sequential data in step S18. When the accounting information retransmitted from the accounting device 30 is received, that is, the slip number of the received accounting information matches the slip number in the accounting information of the sequential data, and the receipt completion flag of the accounting information is already registered If there is, the host device 10 performs only the transaction acceptance completion notification transmission processing in step 17. Thereby, the interrupted process can be resumed and completed.
In the case where the processing target acquired in step S56 is accounting information, when the information at the end of the sequential data acquired in step S55 is a reception completion notification flag, the reception completion notification is transmitted to the accounting apparatus 30, so the recovery process is performed. There is no need to do it.

Thus, according to this embodiment, since the index is registered in the index table of the RAM 13 after the registration to the sequential data in the RAM 13 is completed, the registration up to the end information of the sequential data indicated by the index is completed. , It can be ensured that there is no error in the information. As a result, even if the power is cut off during the registration to the sequential data, it is possible to prevent the order information, the accounting information, and the order management information from being lost.
Further, according to the present embodiment, it is possible to guarantee that there is no error in the index registered in the index table by adding an error detection code to the index and further providing a spare index table in the RAM 13. As a result, even if a power interruption occurs during registration in the index table, there is no error in the index related to the information that has been registered, so that loss of order information, accounting information, and order management information can be prevented. it can.
Further, according to the present embodiment, the RAM 13 further includes a preliminary order management table, and the order management information is double managed to ensure that there is no error in the order management information registered in the order management table. Can do. As a result, even if the power is cut off during registration in the order management table, loss of order management information can be prevented.
In addition, according to the present embodiment, it is possible to guarantee a time when information can be registered by using the two voltage dividers 16 and 17 that have different times when the power reduction occurs. Thereby, when the power is reduced, the RAM 13 can complete the information registration without loss, and it can be guaranteed that there is no error in the stored information. Therefore, it is possible to prevent the occurrence of power interruption during registration in the RAM 13, and thus it is possible to prevent the loss of order information, transaction information, and order management information.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to
For example, in the present embodiment, the case where the host device 10 and the output device 40 are different devices has been described. However, the present invention is not limited to this, and the host device 10 has an output function and is configured as a multi-printer. The output device 40 may be configured as one device.

In the present embodiment, the time T4 is “the time required to write information to the sequential data in the RAM 13, register the index in the index table and the spare index table, and update the error detection code”. Without being limited thereto, the time T4 may be set as “a time required for writing information to the sequential data in the RAM 13, registering the index in the index table, and updating the error detection code”. If registration of at least the index of the index table and the error detection code is surely completed, it is guaranteed that there is no error in the index table. If the output voltage of the voltage dividing unit 17 becomes 0 before the index of the index table and the error detection code are registered, an error occurs in the index table. In this case, if there is an error in the index table in step S51. An error-free index table can be restored by performing processing along the flow in the case of determination. Even if there is no error in the spare index table in step S53, there is a possibility that only the index table is updated to the latest information, so the index in the index table can be copied to the spare index as in step S54. When restarting, the index and the spare index can have the same contents.
Further, when the index table is configured not to store the error detection code, the time T4 may be set as “a time required for writing information to the sequential data in the RAM 13 and registering the index in the index table”.

  In the present embodiment, the information management system is applied to the ordering system. However, the present invention is not limited to this, and the information management system may be applied to another information management system that manages information input to the input device using the host device. Good.

  The host device described above has a computer system inside. Each process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a schematic block diagram which shows the structure of the ordering system by one Embodiment of this invention. It is a figure which shows the example of the sequential data which RAM memorize | stores. It is a figure which shows the order management table which RAM memorize | stores. It is a figure which shows the index table which RAM memorize | stores. It is a sequence diagram which shows the order information registration process at the time of normal of an ordering system. It is a sequence diagram which shows the accounting information registration process at the time of normal of an ordering system. It is a figure which shows operation | movement of the host apparatus at the time of a power failure. It is a flowchart which shows the update process of an order management table and a preliminary order management table. It is a flowchart which shows the registration process to sequential data. It is a flowchart which shows operation | movement of the host apparatus at the time of restart. It is a table | surface which shows the method of the recovery process based on the information of a process target and sequential data tail.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Ordering system 10 ... Host apparatus 11 ... Communication part 12 ... Order information processing part 13 ... RAM 14 ... Power supply backup 15 ... Power-off detection part 16, 17 ... Voltage division part 20 ... Order input device 30 ... Accounting apparatus 40 ... Output Device 50 ... Commercial power supply

Claims (7)

An order input device that receives an order input from a user and transmits order information including a slip number and indicating the content of the order, and a host device that receives the order information from the order input device and manages the order information And accounting for the order, generating accounting information including the slip number and indicating completion of the accounting, and generating output information based on the accounting device that transmits the accounting information and information received from the host device An ordering system comprising an output device for outputting the output information,
The host device is
Communication means for communicating with the order input device or the accounting device or the output device;
Received information registration means for sequentially registering the order information or the accounting information received from the order input device or the accounting device in the storage means;
An order management information registration identification indicating that the registration is completed by registering the order management information indicating the order information or the accounting information integrated with the slip number in association with the slip number in the order management information storage means. Order management information registration means for registering information in the sequential storage means;
A reception completion notification indicating completion of registration of the order management information is transmitted to the order input device or the accounting device, and reception completion notification transmission identification information indicating completion of transmission of the reception completion notification is stored sequentially. An acceptance completion notification transmitting means to be registered in the means;
A slip output command transmitting means for transmitting a slip information output command indicating the content of the order to the output device;
A slip output completion notification receiving means for registering in the sequential storage means slip output identification information indicating that the output of the slip information is completed after receiving the notification indicating the completion of output of the slip information from the output device;
Index registration means for registering an index indicating the position of the information at the end of the sequential storage means in the index storage means every time information is registered in the sequential storage means;
A process for storing in advance processing procedure information indicating the order of processes executed by the reception information registration means, the order management information registration means, the acceptance completion notification transmission means, the slip output command transmission means, and the slip output completion notification reception means Procedure storage means;
When the host device is restarted, the end information of the sequential storage unit is acquired based on the index stored in the index registration unit, and before the restart based on the end information and the processing procedure information. A recovery means for determining the process completed in step S3 and performing the process subsequent to the completed process to recover the host device;
An ordering system comprising: The host device is
Spare index registration means for registering the index in the spare index storage means;
Each time the index is registered in the index storage unit or the spare index storage unit, an error detection code for detecting an error in the index is registered in the storage unit in which the index is registered. ,
When an error in the index is detected by the error detection code of the index storage means and the spare index storage means, and an error is detected in the index of the index storage means, the index of the spare index storage means is changed to the index Index recovery means for copying to the storage means and, when an error is detected in the index of the spare index storage means, copying the index of the index storage means to the spare index storage means;
The ordering system according to claim 1, further comprising: The sequential storage means includes
Order management information registration identification information is registered after order information, and order management information registration identification information is registered after accounting information.
The host device is
After the registration of the order management information registration identification information is completed, the order management information is registered in the preliminary order management information storage means in association with the slip number, and preliminary order management information registration identification information indicating that the registration is completed Pre-order management information registration means for registering in the sequential storage means,
When the host device is restarted, information at the end of the sequential storage unit is acquired based on the index stored in the index registration unit, and the information at the end of the sequential storage unit is order information or accounting information. If the order management information in the preliminary order management information storage means is copied to the order management information storage means, and the information at the end of the sequential storage means is order management information registration identification information, the order management information Order management information recovery means for copying the order management information in the storage means to the preliminary order management information storage means, and registering the preliminary order management information registration identification information in the sequential storage means;
The ordering system according to claim 1, further comprising: The host device is
Connected to an AC power source, divides the power of the AC power source into a predetermined voltage, supplies the divided power to each processing means of its own device that operates with the power, and power supply from the AC power source is interrupted A first voltage dividing means in which the output voltage becomes 0 by interruption of the divided power output;
A power supply that is connected to the AC power source, divides the power of the AC power source into a voltage different from the voltage output by the first voltage dividing unit, and includes at least each of the registration units that operates the divided power with the power. When power is supplied from the AC power supply to each processing means of the apparatus, the voltage output after a predetermined time from the time when the voltage output by the first voltage dividing unit becomes 0 becomes 0. And a second voltage dividing means.
A power-off detecting means for outputting a voltage drop occurrence notice of the second voltage dividing means when a voltage drop of the first voltage dividing section occurs;
Any of the power remaining time, which is the time from when the voltage drop occurrence notice is output in advance to the time when the voltage output by the second voltage dividing means becomes 0, and information registered in the sequential storage means Registration time storage means for registering such information in the sequential storage means, and storing a registration required time which is a minimum time during which an index relating to the information can be registered in the index storage means;
Registration control means for prohibiting new registration of information in the storage means after the registration permission time, which is a time obtained by subtracting the registration required time from the power remaining time after obtaining the voltage drop occurrence notice,
Each of the registration means starts registration in the sequential storage means of information to be registered in the sequential storage means within the registration permission time;
The ordering system according to any one of claims 1 to 3, characterized in that: Information management comprising: an input device that receives input of information from a user and transmits input information that is input information; and a host device that receives the input information from the input device and manages the input information A system,
The host device is
Communication means for communicating with the input device or the output device;
Input information registration means for sequentially registering the input information received from the input device in a storage means;
One or more input information processing means for performing processing on the input information and registering processing completion identification information indicating that the processing is completed in the sequential storage means;
Index registration means for registering an index indicating the position of the information at the end of the sequential storage means in the index storage means every time information is registered in the sequential storage means;
Processing procedure storage means for preliminarily storing processing procedure information indicating the order of processing executed by one or more of the input information processing means;
When the host device is restarted, the end information of the sequential storage unit is acquired based on the index stored in the index registration unit, and the end information and the process stored in the processing procedure storage unit are acquired. A recovery unit that determines processing completed before restart based on the procedure information, and performs recovery processing after the completed processing;
An information management system comprising: An order input device that accepts input of an order from a user, generates order information including a slip number, transmits the order information, and a host that receives the order information from the order input device and manages the order information Accounting for the order with the device, generating accounting information including the slip number and indicating completion of the accounting, generating accounting information for transmitting the accounting information, and generating output information based on information received from the host device An order information loss prevention method in an ordering system comprising an output device that outputs the output information,
The communication means of the host device communicates with the order input device or the accounting device or the output device,
The reception information registration means of the host device registers the order information or the accounting information received from the order input device or the accounting device in a sequential storage means,
The order management information registering means of the host device registers the order information or the accounting information integrated with each slip number in association with the slip number in the order management information storage means as order management information. Register the order management information registration identification information indicating completion in the sequential storage means,
The reception completion notification transmission means of the host device transmits a reception completion notification indicating that the registration of the order management information is completed to the order input device or the accounting device, and confirms that the transmission of the reception completion notification is completed. Registration completion notification transmission identification information shown in the sequential storage means,
The slip output command transmission means of the host device transmits a slip information output command to the output device,
The slip information output completion notification receiving means of the host device stores the slip output identification information indicating that the output of the slip information is completed after receiving the notification indicating the completion of output of the slip information from the output device. Register with the means,
The index registration means of the host device registers an index indicating the position of the end of the information in the index storage means every time information is registered in the sequential storage means,
When the host device is restarted, the recovery unit of the host device acquires the end information of the sequential storage unit based on the index stored in the index registration unit, and based on the end information Recover the host device,
A method for preventing loss of order information. An order input device that accepts input of an order from a user, generates order information including a slip number, transmits the order information, and a host that receives the order information from the order input device and manages the order information Accounting for the order, generating accounting information including the slip number and indicating completion of the accounting, generating accounting information for transmitting the accounting information, and generating output information based on information received from the host device And a computer of the host device in an ordering system comprising an output device that outputs the output information,
Communication means for communicating with the order input device or the accounting device or the output device;
Received information registration means for sequentially registering the order information or the accounting information received from the order input device or the accounting device in a storage means;
Order management information registration identification information indicating that the registration is completed by registering the order information or the accounting information integrated with each slip number in the order management information storage means in association with the slip number as order management information Order management information registration means for registering in the sequential storage means,
A reception completion notification indicating completion of registration of the order management information is transmitted to the order input device or the accounting device, and reception completion notification transmission identification information indicating completion of transmission of the reception completion notification is stored sequentially. An acceptance completion notification transmission means to be registered in the means;
Slip output command transmission means for transmitting a slip information output command to the output device;
A slip information output completion notification receiving means for registering in the sequential storage means slip output identification information indicating that the output of the slip information is completed after receiving a notification indicating completion of output of the slip information from the output device;
Index registration means for registering an index indicating an end position of information in the index storage means each time information is registered in the sequential storage means;
Recovery means for acquiring information at the end of the sequential storage means based on the index stored in the index registration means when the host device is restarted, and recovering the host device based on the information at the end ,
Program to function as.

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