JP2000137621A - Computer-readable recording medium recording event management device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently attain the operation of a system prepared by event driving type programming. SOLUTION: This event managing device 10 is provided with plural queues 12a-12c for events, event dispatch means 11, and event schedule means 13. The event dispatch means 11 judges the priority of the generated events, and inputs the events to the queue for events corresponding to the judged priority among the plural queues 12a-12c for events. Then, the event schedule means 13 preferentially extracts the events from the queue for events whose priority is high among the plural queues 12a-12c for events.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for managing generated events and a computer-readable recording medium on which a program is recorded in order to improve the processing efficiency of a computer system constructed by event-driven programming.

[0002]

2. Description of the Related Art Event-driven programming is a method of constructing a program so that a certain processing procedure is executed when an event occurs.

Examples of familiar events include mouse clicks, key inputs, and command selections when operating a computer.

When developing various kinds of software such as an application program (hereinafter, referred to as “application”), an operating system (hereinafter, referred to as “OS”), and a control system by using the event-driven programming technique, A program is created individually for each event and assembled so that it operates without contradiction as a whole.

In software developed by such event-driven programming, events such as user operations and input of control values are closely associated with processes to be executed.

[0006]

As described above,
In software and computer systems developed by conventional event-driven programming, an event that occurs and a process that is performed due to the event are closely associated with each other.

Therefore, every time an event occurs, processing corresponding to the event is sequentially executed.

However, in the case where the processing is sequentially performed in accordance with the occurrence of an event as described above, an event that causes an urgent processing to be executed may be delayed by an event that has occurred earlier. .

When events occur frequently, a system error may occur due to insufficient memory or the like.

Further, when a predetermined number or more of events are input, simply discarding the events may discard important events.

Further, in the conventional system, priorities are provided in units of tasks, and processing may be performed according to the priorities.

FIG. 5 is a block diagram showing an example of a monitoring system in which processing is managed by a task.

In the monitoring system 1, the temperature data measured by the thermometer 2 is transmitted to the I / O via the RS-232C.
Accepted by the driver 3. The door open / closed state detected by the open / closed state detection sensor 4 is received by the I / O driver 5 via the RS-232C.

A task 6 is a task for monitoring a momentary change in temperature, requests temperature data from the I / O driver 3, and receives a notification of the temperature data. A task is a unit of work viewed from a computer.

Task 7 is a task for monitoring the opening / closing of the door. The task 7 requests the I / O driver 5 for the door opening / closing state, and receives a notification of the door opening / closing state.

The monitoring program 8 is a program for controlling the air conditioning based on the temperature data obtained by the task 6 and the door open / close state obtained by the task 7.

The monitoring program 8 considers that the opening and closing of the door is a factor that greatly changes the air conditioning rather than the instantaneous change of the temperature data, and is somewhat affected by the status of the task switching process. Basically, the air conditioning control process is performed while the task 7 is given priority over the task 6.

That is, in the monitoring system 1, the priority of the task 7 is set higher than the priority of the task 6, and the opening and closing of the door is monitored more than the task 6 that monitors a change in temperature. The task 7 is given priority in the normal monitoring program 8.

As described above, in the monitoring system 8,
Although the door opening and closing, which has a greater influence than the instantaneous temperature change, is prioritized, for example, when the temperature exceeds 35 ° C., the air conditioning control process is performed by giving priority to the temperature change over the door opening and closing. Is better.

However, if the priorities are determined on a task basis as described above, there is a problem that even if the temperature data indicates an extremely abnormal state, the door opening / closing state is given priority and the processing is executed. It is difficult to execute control.

In addition, events requiring urgent processing include:
When a task with a low priority is included, another process is given priority and the emergency process may be delayed.

The present invention has been made in view of the above situation, and manages generated events on the basis of the priorities set for the respective events, thereby enabling a system created by event-driven programming. It is an object of the present invention to provide a computer-readable recording medium on which an event management device and a program for improving operation efficiency are recorded.

[0023]

The gist of the present invention resides in that events are distributed to a plurality of event queues according to their priorities and input.

Hereinafter, specific measures taken to realize the present invention will be described.

According to a first aspect of the present invention, a plurality of event queues and a priority of an event that has occurred are determined, and an event queue associated with the determined priority among the plurality of event queues is determined. An event management apparatus comprising: an event dispatching unit for inputting an event; and an event scheduling unit for preferentially extracting an event from a high-priority event queue among a plurality of event queues.

In the first invention, an event having a higher priority among a plurality of events is extracted as an event to be processed first.

Therefore, even a process having a task with a low priority is quickly executed by increasing the priority of the event itself. That is, a process for an event to be executed urgently (such as occurrence of an abnormality) is promptly executed.

Therefore, the reliability of a system that executes a process based on an event is improved.

Further, even if the events occur frequently and simultaneously, the processes based on the events having the higher priority are sequentially executed, and the efficiency of the processes is improved.

According to a second aspect, in the event management apparatus according to the first aspect, the event dispatching means determines whether the priority of the generated event is an event that can be discarded, and selects one of the plurality of event queues. An event management device that inputs a discardable event to at least one event queue and inputs a non-discardable event to at least one other event queue.

In the second aspect, since the priority of the event is determined based on whether the event can be discarded, two modes of discardable and non-discardable are considered as the priority.

In the task priority schedule, usually,
Scheduling is performed using priorities from 0 to 255. In event scheduling, a sufficient scheduling effect can be obtained by using a few priorities.

Therefore, in the second invention, in addition to the same operation and effect as in the first invention, since a small priority is used, scheduling such as distribution processing to a queue or removal processing from a queue is performed. Processing can be simplified.

It should be noted that three modes of priority, urgent level, normal level, and discardable level may be applied. Here, the emergency level and the normal level are included in the above-mentioned non-discardable level.

According to a third aspect, in the event management apparatus according to the second aspect, when the event dispatching means determines that the number of events stored in an arbitrary event queue has exceeded the maximum number of events, An event management apparatus includes a discarding unit that discards a discardable event stored in an event queue having a lower priority than an arbitrary event queue.

According to the third aspect, when the number of events stored in an arbitrary event queue exceeds the maximum number of events, discarding in an event queue lower than the arbitrary event queue is possible. The event is discarded.

Thus, in addition to the same functions and effects as those of the second invention, it is possible to prevent a system error due to a memory shortage even when events occur frequently and simultaneously.

Also, since only events that can be discarded are discarded, it is possible to prevent events important for control from being discarded, and maintain the reliability of the system.

Further, since the discardable event is discarded, the efficiency of the scheduling process including the process of taking out from the queue and the like is improved.

According to a fourth aspect of the present invention, in the event management apparatus according to the third aspect, the discarding means includes an interval at which an event is put into an event queue for discarding, and an interval at which an event is taken out from the event queue for discarding. Is an event management device that determines the number of events to be discarded by a queuing theory based on.

In the fourth invention, in addition to the same operation and effect as the third invention, the optimum discard number is determined by the queuing theory. As a result, the number of events to be discarded in the event queue is appropriately determined, and the scheduling process can be made more efficient.

According to a fifth aspect of the present invention, in the third or fourth event management device, the discarding means is an event management device for discarding from discardable events previously input to an event queue for discarding.

Depending on the contents of the processing in the system,
Newly generated events may be more important than events that occurred in the past. Examples of such processing include processing for controlling room temperature according to the measured temperature, processing for displaying stock prices, and the like.

In the fifth aspect, the third or fourth
In addition to the same functions and effects as the invention of the first aspect, since old events are discarded first, important events are further prevented from being discarded.

Therefore, the reliability of the system can be further maintained.

According to a sixth aspect of the present invention, in the event management apparatus according to the third to fifth aspects, the discarding means controls the event discarding so that the rate of discarding becomes almost the same level among various types of events. Device.

According to the sixth aspect, only predetermined types of events are not discarded and discarded.

Therefore, the reliability of the system can be further maintained.

According to a seventh aspect of the present invention, in the event management apparatus according to the first to sixth aspects, the event dispatcher inputs the event when the number of events stored in the event queue exceeds the maximum number of events. An event management device that stops and restarts event input when the number of events stored in the event queue becomes smaller than the number of input restart events.

In the seventh aspect, the first to sixth aspects
In addition to the same operation and effect as the invention of the third aspect, since the number of events input to the event queue is controlled to be within a predetermined range, stable event management is possible.

Since the number of events in each event queue does not exceed a predetermined number, a system error due to a memory shortage is further prevented.

According to an eighth aspect, in the event management apparatus according to the seventh aspect, the event dispatching means, when the number of events stored in an arbitrary event queue exceeds the maximum number of events, Stops sending events to event queues of lower priority than the event queue, and if the number of events stored in the given event queue becomes less than the number of restarted events, An event management device that resumes inputting events to an event queue having a lower priority than the event queue.

When the number of events stored in an arbitrary event queue exceeds the maximum number of events, it becomes difficult to perform a process of taking out the event from a lower event queue.

Therefore, in the eighth invention,
In addition to the same operation and effect as the seventh aspect of the present invention, since an event that is difficult to be scheduled is not put in the event queue, a system error due to a memory shortage can be further prevented, and appropriate event management can be performed.

According to a ninth aspect of the present invention, a computer realizes a queue realizing function for realizing a plurality of event queues and a priority of an event that has occurred. A program for realizing an event dispatch function for putting an event into an associated event queue and an event schedule function for taking out an event preferentially from a high-priority event queue among a plurality of event queues. The recorded computer-readable recording medium.

The ninth invention is a computer-readable recording medium on which a program for causing a computer to realize the same functions as the first invention is recorded.

By using a recording medium in which a program is recorded as in the ninth aspect, the above-mentioned functions can be easily added to an apparatus or a computer which does not have the above-mentioned functions.

Similarly, the second to eighth inventions can be realized and provided as a computer-readable recording medium on which a program is recorded.

[0059]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In the present embodiment, the queue for inputting the event is switched according to the priority of the event to be generated, and when the event is taken out from the queue, the event having the higher priority is started. The event management device to be taken out will be described.

FIG. 1 is a block diagram showing a configuration of a monitoring system having an event management apparatus according to the present embodiment. The same parts as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. Here, only the different parts will be described in detail.

The event management device 10 provided in the monitoring system 9 includes I / O drivers 3 and 5 and tasks 6 and 7
Between the event dispatcher 11,
It comprises event queues 12a to 12c and an event scheduler 13.

The event dispatcher 11 treats temperature data that changes from moment to moment at predetermined intervals from the I / O driver 3 as regular temperature events. A case where the temperature data exceeds 35 ° C. is treated as an abnormal temperature event. Further, a case where the door opening / closing state changes from the I / O driver 5 is treated as an opening / closing event.

The event dispatcher 11
Determines the priority of each event by event priority processing. Note that the event priority is provided with three levels of an emergency level, a normal level, and a discardable level in descending order of priority.

Here, the emergency level is the priority of an event that needs to be notified of the situation urgently, such as the occurrence of an error in the device, for example, an abnormal temperature event.

The normal level is the priority of a normal event having no urgency, and here corresponds to an open / close event.

The discardable level refers to a priority of an event that does not significantly affect the operation of the system even if discarded, such as input / output of a focus to a subject in GUI management and a regular notification of the position of a mouse cursor. Degrees, and here is the scheduled temperature event.

Then, the event dispatcher 11
Enters the event into the event queue 12a when the priority of the determined event is the urgent level, into the event queue 12b when the priority is the normal level, and into the event queue 12c when the priority is the digestion level. I do.

The event dispatcher 11
Holds the maximum number of events, which is the number of events that can be stored, for each of the event queues 12a to 12c.
The maximum number of events in each of the event queues 12a to 12c is compared with the number of events stored in each of the event queues 12a to 12c. And, as a result of the comparison,
If there is an event queue in which the number of events to be stored exceeds the maximum number of events, entry of a new event into this event queue is stopped.

Further, the event dispatcher 11
Holds the number of input resumption events for each of the event queues 12a to 12c, the number of events stored in the event queue for which the event input has been stopped, the number of input resumption events for this event queue, Compare.
As a result of this comparison, if the number of stored events becomes smaller than the number of input restart events, input of a new event to this event queue is restarted.

Each of the event queues 12a to 12c is associated with an emergency level, a normal level, and a discardable level, respectively, and accumulates events of each level.

The event scheduler 13 extracts events from the plurality of event queues 12 a to 12 c in order from the event queue with the highest priority in a round robin manner, and supplies the events to the tasks 6 and 7.

The operation performed by the monitoring system 9 including the event management device 10 having the above configuration will be described below.

First, an event generated by an event generator such as the thermometer 2 or the open / closed state detection sensor 4 is
The event is input to the event dispatcher 11 via the RS-232C and the I / O drivers 3 and 5.

The priority of the input event is determined by the event scheduler, and the event is queued in the event queue corresponding to the determined priority. Thereby, for example, the abnormal temperature event is put into the event queue 12a associated with the emergency level. The opening / closing event is put into the event queue 12b associated with the normal level. Further, the scheduled temperature event is put into the event queue 12c associated with the discardable level.

The events queued in the event queue are taken out by the event scheduler 13 in descending order of priority. As in the above example, when the abnormal temperature event, the opening / closing event, and the scheduled temperature event are stored in the event queues 12a to 12c, the events are respectively the abnormal temperature event,
The event is extracted by the event scheduler 13 in the order of the opening / closing event and the scheduled temperature event.

The extracted event is notified to the corresponding task. For example, the abnormal temperature event and the scheduled temperature event are temperature data from the thermometer 2, and thus are notified to the task 6. On the other hand, since the open / close event is the door open / closed state by the open / closed state detection sensor 4, the task 7
Will be notified.

Normally, the priority of tasks 6 and 7 is
Is higher than the task 6, and the monitoring of the door open / closed state has priority over the monitoring of the temperature data. This allows
In the monitoring program 8, even if the temperature exceeds 35 ° C., the process related to door opening and closing is prioritized.

However, the event management device 1
When the temperature exceeds 35 ° C. by passing through 0, temperature data indicating that the temperature is 35 ° C. is sent from the event management apparatus rather than the event that the door open / close state is notified from the event management apparatus 10 to the task 7. The task 6 is notified first.

Accordingly, data indicating that the temperature is 35 ° C. is first received by the task 6 and provided to the monitoring program 8, and then the door open / closed state is received by the task 7 and provided to the monitoring program 8.

Further, by the same operation as described above, the previously generated scheduled temperature event (temperature data less than 35 ° C.)
In some cases, an abnormal temperature event (temperature data exceeding 35 ° C.) that has occurred later is retrieved earlier from the event queue by the event scheduler 13 and provided to the task 6.

Here, it is assumed that, for example, the number of events stored in the event queue 12b exceeds the maximum number of events set in the event queue 12b while the above operation is continued.

Then, the opening / closing event input processing by the event dispatcher 11 is stopped.

After that, when the event scheduler 13 executes a take-out process, and the number of open / close events stored in the event queue 12b becomes smaller than the number of closing / opening events, the event dispatcher 11 starts to open / close the open / close event again. You.

FIG. 2 is a diagram showing an example of a change state of the number of events stored in the event queue in the present embodiment.

When the number of events input is greater than the number of events retrieved, the number of events stored in the event queue increases.

Here, when the number of events stored in the event queue exceeds the maximum number of events, the event input is stopped.

As a result, only the event fetch process is executed, so that the number of events stored in the event queue is reduced. Then, when the number of events stored in the event queue becomes smaller than the number of resumption events, the input of events is restarted.

As described above, when the event management apparatus 10 according to the present embodiment is applied, an event is allocated to a plurality of event queues 12a to 12c according to the priority of the event, and the event queue having a higher priority is assigned. Event is taken out first.

Thus, even if the priority of a task and the processing for this task are determined, the event that causes the processing to be executed urgently has priority, and the monitoring program 8 performs the processing.

Also, even if the event is monitored by the same task, the event that causes the process to be executed urgently has priority, and the monitoring program 8 performs the process.

Furthermore, even if an event to be processed urgently includes a task with a low priority, the task is scheduled according to the priority of the event and processed by the monitoring program 8.

Therefore, even in the case of an abnormality or the like, the recovery processing of the monitoring system is executed quickly, so that the reliability of the system can be improved.

Further, the higher the priority of the event, the earlier the event is processed, so that the efficiency of the process can be improved.

Further, in view of the fact that a sufficient effect can be obtained if the priority regarding the event is about three levels, the event management apparatus according to the present embodiment sets the priority to three levels.

Therefore, the event dispatcher 11
Since the event input process and the event retrieval process of the event scheduler 13 can be simplified, a sufficient effect can be obtained while reducing the process related to scheduling.

Further, in the event management apparatus 10 according to the present embodiment, when the number of events secured in the event queue exceeds the maximum number of events, the event input to the event queue is stopped. Because
Memory can be saved, system errors due to insufficient memory can be prevented, and system reliability can be further improved.

When the number of events reserved in the event queue becomes smaller than the number of resuming events, the resuming of events is resumed, so that event management can be flexibly resumed.

(Second Embodiment) In this embodiment, an event queue lower than the event queue for which the entry of events has been stopped, and which is associated with a discardable level. An event management device that discards an event stored in the event management device will be described.

FIG. 3 is a block diagram showing the configuration of the event management apparatus according to the present embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only will be described in detail.

The event management device 14 differs from the event management device 10 described above in having an event dispatcher 15 and an event discarding unit 16.

The event dispatcher 15 is the first
It has the same function as the event dispatcher 11 described in the above embodiment, except that it notifies the event discarding unit 16 of the event queue in which the event input is stopped.

The event discarding unit 16 receives from the event dispatcher 15 a notification of the event queue in which the event input has been stopped. Then, it discards the event held in the event queue lower than the notified event queue and associated with the discardable level.

The operation of the event management apparatus having the above configuration will be described below.

When the event input is stopped in the event queue higher than the event queue 12c associated with the discardable level, the event stored in the event queue 12c is almost not scheduled. It can be said that there is.

Therefore, an event that is lower than the priority of stopping the event input and can be discarded is discarded by the event discarding unit 16.

As described above, in the event management apparatus 14 according to the present embodiment, the discardable events stored in the event queue lower than the event queue for which the input of the event is stopped are discarded. .

Thus, it is possible to prevent the memory shortage while suppressing the influence on the processing of the entire system.

Further, since the process of extracting a discardable event can be reduced, the scheduling process can be lightened, and the efficiency of the event management process can be improved.

Further, since the events to be discarded are discardable events, important events can be prevented from being discarded, and the reliability of the system can be maintained.

(Third Embodiment) In the present embodiment, a modification of the event management device 14 according to the second embodiment will be described. In the present embodiment, the event dispatcher 15 and the event discarding unit 16 are changed.

Some events are more important the more recent, such as temperature data that is periodically measured for controlling air conditioning, or a stock price when the current stock price is displayed.

Therefore, it is assumed that the event discarding unit in the present embodiment discards an event stored in the event queue from an old event (an event that has occurred first).

The event discarding unit monitors an interval of inputting an event to each event queue and an interval of taking out an event from each event queue. The monitoring result and the queue theory are used for the event discarding unit. The number of events waiting in the queue is predicted, and the number of events to be discarded is determined based on the prediction.

FIG. 4 is a flowchart showing the processing of the event dispatcher and the event discarding unit provided in the event management apparatus according to the present embodiment.

When the latest event occurs, first, the priority of the latest event is determined by the event dispatcher (s1).

Next, the number of events stored in the event queue associated with the priority is confirmed, and it is determined whether there is a possibility that the entry of the latest event may be stopped (s2).

As a result of the determination, when there is no possibility that the input of the latest event is stopped, the latest event is stored in the event queue associated with the determined priority (s3).

On the other hand, when there is a possibility that the input of the latest event may be stopped, the determined priority is notified to the event discarding unit. Then, the number of discarded events is determined by the event discarding unit by the queue calculation based on the event input interval to the event queue of the notified priority and the event take-out interval (s4).

The old event stored in the event queue of the notified priority is discarded by the event discarding unit according to the determined event discard number (s5).

Thereafter, the latest event is put into the event queue from the event dispatcher (s3), and is repeated until the above processing is completed (s6).

As described above, in the event management apparatus according to the present embodiment, since old events are discarded first, it is possible to prevent a system error due to a memory shortage while suppressing the effect on processing in the system. Can be.

The number of events to be discarded is dynamically determined by applying the queue theory, so that the number of events stored in the event queue can be appropriately managed.

As a result, the efficiency of event management can be further improved.

(Fourth Embodiment) In the event management device according to the present embodiment, a modification of the event management device 14 according to the second embodiment will be described. In the present embodiment, the operation of the event discarding unit 16 is modified.

The event management device according to the present embodiment
When discarding events in the event queue, control is performed so that the rate of discarding for each event type is substantially uniform.

When discarding events, for example, if events stored in the event queue are thinned out at predetermined intervals, only events of the same type may be thinned out. In other words, if the events A and B are sequentially stored in the event queue as “ABABABABABA”, if every other event is thinned out, only one of the events A and B will be extremely discarded.

In the present embodiment, since the event discarding is controlled so that the ratio of the types of the discarded events is substantially uniform, it is possible to prevent only the events of the specific type from being discarded unevenly, and to improve the efficiency. Good event management becomes possible.

(Fifth Embodiment) In the present embodiment, a modification of the event management apparatus according to each of the above embodiments will be described.

The event dispatcher provided in the event management apparatus according to the present embodiment, when the event input to an arbitrary event queue is stopped, to an event queue lower than the arbitrary event queue. There is a function to stop the event input.

When the event input to an arbitrary event queue is restarted, the event input to an event queue lower than the arbitrary event queue is also restarted.

As described above, scheduling is hardly performed for events lower than the event for which input has been stopped.

Therefore, by stopping the scheduling process for events lower than the input stopped event, the scheduling process efficiency and the memory use efficiency can be further improved.

The functions of the event management devices described above are, for example, magnetic disks (floppy (registered trademark) disks, hard disks, etc.), optical disks (CD-ROMs, DVDs, etc.) as programs that can be executed by a computer. ), It is also possible to apply it by writing it on a recording medium such as a semiconductor memory, or to apply it to various devices by transmitting it via a communication medium. A computer that realizes the function of the event management device reads the program recorded on the recording medium, and executes the above-described processing by controlling the operation of the program.

[0135]

As described above, according to the present invention, the priority of each event is determined, and the generated event is allocated to the event queue corresponding to each priority. And
The event is scheduled by taking out the event with the higher priority first.

As a result, even if the processing is based on a task with a low priority, the processing can be promptly performed by setting the priority of the event to be high, and the processing for an event requiring urgency is quickly executed.

Therefore, system reliability, control operation stability, and event management efficiency are improved.

In the present invention, an event queue for storing events that can be discarded and an event queue for storing events that cannot be discarded are provided. That is, according to the present invention, for example, two levels, such as a discardable level and a non-discardable level,
Alternatively, three levels of priority can be set.

In event scheduling, 2 or 3
Sufficient scheduling effects can be obtained by allocating stages to priorities.

Therefore, by setting the priority level to two or three levels, while obtaining a sufficient scheduling effect,
It is possible to simplify the scheduling process accompanying the reduction of the process of putting an event into a queue and the process of taking an event out of a queue.

In the present invention, among the events stored in the event queue lower than the event queue exceeding the maximum number of events, discardable events are discarded.

Therefore, it is possible to prevent a system error due to a memory shortage while preventing important events from being discarded, thereby further improving the reliability of the system.

In the present invention, the number of events to be discarded is changed based on the queuing theory. As a result, the discard processing can be performed while predicting the number of events waiting in the event queue, and events can be managed at a high level in consideration of the balance with system resources, thereby further improving efficiency. It is planned.

In the present invention, in the case of an event that is more important as it is newer, the oldest event is discarded. As a result, important events can be prevented from being discarded, the operation of the system can be made more efficient, and the reliability of the system can be improved.

Further, according to the present invention, for each event type,
Since the discarding is performed so that the discarding rate is almost the same level, only a specific event is prevented from being discarded.

In the present invention, when a predetermined number or more of events are stored in the event queue, the event input to the event queue is stopped, thereby preventing a memory shortage.

In the present invention, when a predetermined number or more of events are input to an arbitrary event queue and the input is stopped, the input of events lower than the arbitrary event queue is also stopped. Thereby, memory shortage is further prevented, and unnecessary event input processing and event retrieval processing can be reduced.

Therefore, the reliability of the system is improved, and the efficiency of the scheduling process is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a monitoring system including an event management device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a change state of the number of events stored in an event queue in the embodiment.

FIG. 3 is a block diagram showing a configuration of an event management device according to a second embodiment of the present invention.

FIG. 4 is a flowchart showing processing by an event scheduler and an event discarding unit provided in an event management device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing an example of a monitoring system in which processing is managed by a task.

[Explanation of symbols]

 1, 9 monitoring system 2 thermometer 3, 5 I / O driver 4 open / closed state detection sensor 6, 7 task 8 monitoring program 10, 14 event management device 11, 15 event dispatcher 12a to 12c Event queue 13: Event scheduler 16: Event discard unit

Claims (9)

[Claims] 1. A plurality of event queues and a priority of an event that has occurred are determined, and an event is input to an event queue associated with the determined priority among the plurality of event queues. An event management device, comprising: an event dispatcher; and an event scheduler that preferentially extracts an event from a higher priority event queue among the plurality of event queues. 2. The event management device according to claim 1, wherein the event dispatcher determines whether the priority of the generated event is an event that can be discarded, and determines at least one of the plurality of event queues. An event management device, wherein a discardable event is input to one event queue, and a non-discardable event is input to at least one other event queue. 3. The event management device according to claim 2, wherein when the event dispatching unit determines that the number of events stored in an event queue exceeds a maximum number of events, the event management unit determines that the event has occurred. An event management device, comprising: a discarding unit that discards a discardable event stored in an event queue having a lower priority than the event queue. 4. The event management device according to claim 3, wherein the discarding unit is based on an interval at which an event is input to an event queue to be discarded and an interval at which an event is taken out from the event queue to be discarded. An event management device for determining the number of events to be discarded by queuing theory. 5. The event management apparatus according to claim 3, wherein said discarding means performs discarding from a discardable event previously input to an event queue to be discarded. apparatus. 6. The event management apparatus according to claim 3, wherein the discarding means is configured to make the rate of discarding between various types of events substantially the same level. An event management device characterized by controlling. 7. The event management device according to claim 1, wherein the event dispatching unit determines that the number of events stored in an event queue exceeds a maximum number of events. An event management apparatus characterized in that event input is stopped, and event input is restarted when the number of events stored in the event queue becomes smaller than the input restart event number. 8. The event management device according to claim 7, wherein the event dispatching means is configured to, when the number of events stored in an arbitrary event queue exceeds a maximum number of events, change the event queue of the arbitrary event. When the event queue to the lower priority event queue is stopped, and the number of events stored in the queue for the arbitrary event becomes smaller than the number of events for resuming the event, the queue for the arbitrary event is stopped. An event management apparatus for resuming input of an event to an event queue of lower priority. 9. A queue realizing function for realizing a plurality of event queues by a computer, and a priority of an event that has occurred is determined, and the plurality of event queues are associated with the determined priority among the plurality of event queues. A program for realizing an event dispatching function for putting an event into an event queue that has an event queue function and an event scheduling function for taking out an event preferentially from a high-priority event queue among the plurality of event queues. A computer-readable recording medium that has been recorded.