JPH11232234A - Remote procedure server and method for managing remote procedure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dynamically and flexibly connect distributed objects by dynamically loading stub objects. SOLUTION: A remote procedure client sends a remote procedure accessing message including prescribed remote procedure stub information to be executed by a 2nd remote procedure server to a 1st remote procedure server 200. The server 200 analyzes the message by its stub extraction part 220, and when there is no corresponding stub storing part, generates a stub storing part and registers the message in the generated stub storing part. A message generation part 250 in the server 200 generates a message by using the registered contents of the stub storing part and executes remote procedure access to the 2nd remote procedure server.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote procedure management technique used in a network information system in which a plurality of computer systems for performing information processing are connected to a network.

[0002]

2. Description of the Related Art First, a conventional technique will be described. [CORBA] CORBA (Common Object)
t Request Broker Architect
ure and Specification) is an object-oriented standardization body, Object Ma.
A standard specification for distributed objects developed by the management group. Interfa
ce Repository is an ORB (Object Request Broker) defined by CORBA.
Component that persists the interface definition for the object. ORB
Can use the interface definition of the object managed by the Interface Repository as follows.・ Request type check ・ Check the validity of interface inheritance graph ・ Provide interoperability between different ORB realizations ・ Install and distribute interface definitions ・ Support interface / browser environment ・ Interface information for language system Provision ・ Provision of components to end users

[0003] Also, CORBA's Dynamic In
The location interface stipulates the following method. -Acquisition of object interface name-Acquisition of method and definition from Interface Repository-Generation of argument list-Method invocation

[0004] However, the OMG-defined Inte
In the dynamic method invocation using the rface Repository, a method of composing a remote procedure invocation message including interface information and requesting a remote procedure invocation not defined on the server side is not defined.

[0005] Further, there is no provision for a server to make a remote call by adding stub information and interface information for dynamically calling another server in advance.

[0006] Japanese Patent Laying-Open No. 7-282017 discloses an interface definition file generating apparatus which generates a stub for providing a distributed processing environment from a source program defining a procedure provided to a client by a server. An interface definition file that describes the procedure specifications is generated in a language specified by the generation compiler.

[0007] However, this publication does not disclose anything about how a server dynamically adds stub information and interface information for calling another server in advance and performs a remote call.

[Japanese Patent Application Laid-Open No. 6-75892]
JP-A-75892 discloses a “remote procedure management device” which includes a system remote procedure request unit for requesting a remote procedure for a service provided by a system, and a system remote procedure for executing a remote procedure for a service provided by the system. An execution unit, a system remote procedure management unit that manages a plurality of remote procedures of a service provided by the system in association with the system remote procedure execution unit based on a unique remote procedure identifier in the network system, and executes a remote procedure call A system procedure pre-processing unit that is called from the stub to make an inquiry to the system remote procedure management unit, determines the remote procedure of the system to be called, and calls the corresponding system remote procedure execution unit. System without having to define Function that can be called a remote procedure Temu is provided is provided.

[0009] However, this publication does not disclose anything about a method of remotely calling a server by adding stub information and interface information for dynamically calling another server in advance.

[Patent Document 1] Japanese Unexamined Patent Application Publication No. Hei 8-263347 discloses a "distributed computer system" disclosed in Japanese Patent Laid-Open Publication No. Hei 8-26347. A process of storing a viewer program for viewing various data types. A process of selecting a reference; a process of starting a search for an object; a process of determining whether a viewer program corresponding to the data type is included; a process of determining whether a viewer program is stored in another computer; a viewer program A process of loading a copy of the object, a process of executing a verification procedure on the viewer program, and a function of automatically downloading a viewer of an object to be referenced by the process of executing the viewer program.

[0011] However, this publication does not describe that the server performs remote calling by adding in advance stub information and interface information for dynamically calling another server. Furthermore, there is no description about using a stub that cannot be uniquely determined only by the relationship between the client and the server.

[0012]

In the conventional remote procedure management apparatus, in order for a client to request a remote procedure call from a remote procedure server, a stub for expressing data of parameters in conformity with the calling convention is used. It was necessary to statically maintain and execute a library called, or the client needed to dynamically assemble the data representation of the parameters.

Therefore, when a client wants to request a remote procedure call from the first remote procedure server to the second remote procedure server, the first remote procedure server holds a stub for the second remote procedure server. And is programmed to invoke the stub or not to retain the stub but to dynamically assemble the message on the network to match the data representation of the parameters of the second remote procedure server. did not become.

However, it is difficult to maintain the stubs of all the servers making the remote procedure call in a situation where various types of remote procedure servers are operating. If the interfaces of the remote procedure call accepted by the second remote procedure call server do not match, it has been difficult to connect the first remote procedure server and the second remote procedure server.

The present invention has been made in consideration of the above circumstances, and executes a remote procedure call by sequentially tracing a plurality of servers without considering whether the server has desired interface information. The purpose is to be able to.

[0016]

According to the present invention, in order to achieve the above object, a remote procedure call is transmitted from a client to a first server together with stub information.
The server registers the stub information and transmits the remote procedure call from the first server to the second server using the registered stub information.

In this configuration, a remote procedure call can be made to the second server even if the desired stub information is not stored in the first server. The same applies to servers that receive calls thereafter.

The stub information includes a stub code, a stub attribute (class), a source program, and the like.

[0019]

Embodiments of the present invention will be described below. [Embodiment 1] In this embodiment, a two-step remote procedure call is performed. In this embodiment, a stub object is specified to specify an RMI (Remote Method).
d Invocation). This embodiment describes the operation when one remote procedure server receives a request from a remote procedure client, and this remote procedure server makes a remote procedure call request to another remote procedure server. .

FIG. 1 shows the first embodiment as a whole, and FIGS. 2, 3 and 4 show the remote procedure client 100 and the remote procedure servers 200 and 30 which are components of FIG.
0 are shown.

In FIG. 1, a remote procedure client 100 and remote procedure servers 200 and 30 are connected to a network 400.
0 is connected. Of course, another remote procedure client or remote procedure server may be further connected to the network 400. The remote procedure client 100 makes a remote procedure call to the remote procedure server 200 via its client stub 101, for example. The remote procedure server 200 receives the remote procedure call from the remote procedure client 100 at the server skeleton 201, generates a result, and returns the result to the client 100. If the remote procedure server 200 cannot execute the remote procedure, the remote procedure server 200 passes the remote procedure call to the desired remote procedure server 300. At this time, the client stub 202 of the remote procedure server 200 and the server skeleton 301 of the remote procedure server 300 are used. Interface on network 400
The repository 500 manages interface definitions of objects.

In FIG. 2, the remote procedure client 10
0 is a communication unit 110, a stub extraction unit 120, a remote procedure management unit 130, and M remote procedure holding units 140-1 to 140-1.
140-M, a message generation unit 150, a stub management unit 160, and N stub holding units 170-1 to 170-
N.

Remote procedure holding units 140-1 to 140-M
Are attribute holding units 141-1 to 141-M, respectively.
It is configured to include procedure specification disclosure units 142-1 to 142-M and procedure definition units 153-1 to 153-M. The stub holding units 170-1 to 170-N are respectively an attribute holding unit 171-1 to 171-N and a stub / code holding unit 1
72-1 to 172-N.

The communication unit 110 transmits a remote procedure call message input from the message generation unit 150 to the remote communication unit, and receives a response message from the remote communication unit. The communication unit 110 is "cl
The other communication unit is identified by the address “ent-1”.

The stub extraction unit 120 analyzes the remote procedure call message and the remote procedure call response message received from the communication unit 110, and registers the stub information in the stub management unit 160 if the message contains stub information. In addition to requesting the remote procedure management unit 130 to search the corresponding remote procedure holding unit 140, a remote procedure call request message or a remote procedure call response is output.

The remote procedure management unit 130 includes the stub extraction unit 1
The remote procedure holding unit 140 is searched based on the search request of the remote procedure holding unit output from 20, and a remote procedure call request message or a remote procedure call response is output to the searched remote procedure holding unit 140. .

Remote procedure holding section 140 executes the procedure definition held in procedure definition section 143 in accordance with the input remote procedure request message. Also, the remote procedure holding unit 140 outputs a stub search request and an input parameter to a stub code to the stub management unit 160 during the procedure execution,
Receiving a response from the stub code.

The stub management unit 160 is a stub extraction unit 120
The stub registration request including the stub attribute and the stub code output from the stub is searched based on the attribute held by the stub holding unit 170. If the corresponding stub holding unit does not exist, the stub attribute and the stub A new stub holding unit consisting of a code is generated and registered, and a stub holding unit search request and an input parameter to the stub code are received from the remote procedure management unit 130, and the corresponding stub holding unit exists. In this case, the stub code and the input parameter are output to the message generation unit 150.

Message generating section 150 generates a message by giving the input parameters to the input stub code and executing the stub code, outputs the generated message to communication section 110, and performs communication. It analyzes the remote procedure call response message input from unit 110 and outputs a response to remote procedure holding unit 140.

The remote procedure server 200 and the remote procedure server 300 have the same configuration as the remote procedure. FIG. 3 shows the configuration of the remote procedure server 200, and FIG.
0 is shown. In FIGS. 3 and 4, parts corresponding to those in FIG. 2 are denoted by corresponding reference numerals, and detailed description thereof will be omitted.

Communication unit 2 constituting remote procedure server 200
Reference numeral 10 denotes an address "server-1", which is identified from other communication units. The communication unit 310 included in the remote procedure server 300 is identified from other communication units by an address “server-2”.

Unless otherwise specified, all procedure definition sections 143, 243, and 343 have arguments named v1, v2, and v3 for convenience.

For simplicity of explanation, "server-
1 ”from the communication unit 110 represented by the address“ se ”.
communication unit 210 represented by an address “rver-2”
The message on the network for calling the method “method-1” held by the remote procedure holding unit whose name attribute value is “name-1” is “ne
tprotocol, dst: server-2, na
me: name-1, method: method-
1, arguments 1,. . . , Argument n ". In this embodiment, for the sake of simplicity, only integer types, character string types, and stub types are used as the argument types. In the expression and character string type, the character string is surrounded by "", and when it is included in the character string, it is described as "$". As for the stub type, the attribute and code of the holding unit are represented by a character string as a representation on the network.

However, these expressions are not intended to limit the present invention to the embodiments using them, and the present invention includes modifications, changes, and equivalents without departing from the gist of the present invention. .

[Remote Procedure 140-1] Remote Procedure Holding Unit 1
40-1 holds the attribute in the attribute holding unit 141-1 assuming that the value of the attribute "name" is "object A". In addition, the procedure st
A procedure defined by the following algorithm 1 is defined as art.

1. Find the character string that is the assignment of the argument. This character string is referred to as string1. 2. In the stub management unit 160, the value of the attribute “name” is “
2. Search for a stub holding unit that is 170-1 ″ and request it to be returned. 3. If there is no stub holding unit, end the algorithm. 4. String1 as first argument, stub holding unit 170 −
The message iterate is transmitted to the stub holding unit 170-2 with the reference to 1 as the second argument.

[Remote Procedure Holding Unit 240-1] The remote holding unit 240-1 holds the attribute in the attribute holding unit 241-1 assuming that the value of the attribute "name" is "object B". The procedure definition section 243-1 includes a method it
A procedure represented by the following algorithm 2 is defined as “erate”.

1. The assignment of the first argument v1 is determined, and
Let it be string1. 2. The assignment of the second argument v2 is obtained, and this is set as ref1. 3. string1 is separated into partial character strings using blank symbols as separators, and each partial character string is defined as w-1... wn. 4. The following steps are executed for each of w-1... wn, and the result is represented as result-1.
t−n. 5. A message “apply (wi)” is transmitted to ref. 6. result-1... result-n are concatenated and returned as a result.

[Remote Procedure Holding Unit 340-1] The remote holding unit 340-1 holds the attribute in the attribute holding unit 341-1 assuming that the value of the attribute "name" is "object C". Also, the method lo
As okup, a procedure represented by the following algorithm 3 is defined.

1. The assignment of the character string of the first argument is obtained, and this is set as v1. 2. The assignment of the integer of the second argument is obtained, and this is set as v2. 3. An English word starting from the character string v1 is searched, and a character string in which up to v2 words are concatenated in the dictionary order using blank symbols as separators is returned.

For example, lookup (“water”,
For the method call 2), "water w
However, this method definition is not intended to limit the present invention to the embodiments using these methods, and the present invention does not limit the scope of the present invention to modifications, changes, and modifications. Includes equivalents.

[Stub holding unit 170-1] The attribute holding unit 171-1 of the stub holding unit 170-1 has an attribute name
, The attribute value of the attribute dst is stored as server-3, and the attribute of the attribute reference is stored as "object C". Stub code holding unit 172 of stub holding unit 170-1
1 holds a program represented by the following algorithm 4.

1. If the method is apply, go to the next step. Otherwise, end the algorithm. 2. Find the character string that is the assignment of the first argument. This character string is referred to as string1. 3. "Netprotocol, dst: server
-3, name: object C, method: lo
3. Generate a character string represented by “okup, string1, string2.” 4. Return a response returned as a result of the generation.

For the sake of simplicity, the character string representation on the network representing the contents of the stub holding unit 170-1 is stub-
170-1.

[Stub holding unit 170-2] The attribute holding unit 171-2 of the stub holding unit 170-2 stores the attribute value of the attribute dst as "server-2" and the attribute "refelen".
The attribute of ce is held as “object B”. Stub code holder 1 of stub holder 170-2
72-2 holds a program represented by the following algorithm 5.

1. If the method is iterate, go to the next step. Otherwise, end the algorithm. 2. Find the character string that is the assignment of the first argument. This character string is referred to as string1. 3. Find the stub that is the assignment of the second argument. This character string is represented as string2. 4. Attribute "dst" held by attribute holding unit 1-12-1
And attribute value of attribute “reference”
stval and ref. 5. "Netprotocol, dst: dstva
l, name: ref, method: iterat
5. Generate a character string represented by "e, string1, string2". 6. Return a response returned as a result of the generation.

[Specific Example of Operation] Next, a specific example of the operation will be described. [Step S1] The remote procedure client 100 starts the method start of the procedure definition unit 143-1 as an initial state.
(“Water salt sea”) is started.

[Step S2] The procedure definition unit 143-1 executes the algorithm 1 according to the definition of the method start. That is, (a) a character string which is an assignment of an argument is obtained, and “water” is obtained.
“salt sea” is assumed to be string 1. (b) The stub management unit 160 is requested to search for a stub holding unit whose attribute “name” is “170-1” and to return the stub holding unit if it exists. ) Stub management unit 160 to stub holding unit 170-1
To receive. (D) Message it to stub holding section 170-2
erate (string1, stub holding unit 170-
Execute 1).

[Step S3] Stub holding section 170-2
Receives the above message and returns the method iterat
According to the definition of e, the program represented by the algorithm 5 is input to the message generator 150 and executed. That is, (a) A character string which is an assignment of the first argument is obtained. This character string is referred to as string1. (B) Obtain a stub that is an assignment of the second argument. This character string is represented as string2. (C) The attribute “dst” held by the attribute holding unit 171-1
And attribute value of attribute “reference”
server-2 and "object B". (D) "netprotocol, dst: server
r-2, name: object B, method: i
A character string represented by “terate, string1, string2” is generated.

[Step S4] Message generator 150
Transmits the message 1 represented by the character string to the communication unit 110.

[Step S5] The communication section 110 transmits the message input from the message generation section 150.

[Step S6] The server-2 included in the message 1 is the communication unit 21 of the remote procedure server 200.
Since the address is 0, the message 1 is transmitted to the communication unit 210.
Received by

[Step S7] The communication section 210 inputs the received message 1 to the stub extraction section 220.

[Step S8] The stub extraction unit 220 analyzes the message 1, and finds “nam” included in the character string stub-170-1 representing the contents of the stub holding unit 170-1.
The stub management unit 260 requests the stub management unit 260 to search for a stub holding unit having the attribute value 170-1 of the e ″ attribute.

[Step S9] Since there is no corresponding stub holding unit, the stub managing unit 260 generates a stub holding unit and manages it as the stub holding unit 270-Q.

[Step S10] Next, the stub extractor 22
0 searches the remote procedure management unit 230 for a remote procedure storage unit in which the value of the attribute “name” is “object B”, and iterates the searched remote procedure storage unit.
("Water salt sea", stub holding unit 2
70-Q).

[Step S11] Remote procedure management section 230
Searches for the remote procedure holding unit 2-5-1 in which the value of the "name" attribute is "object B",
Enter

[Step S12] Remote procedure holding section 240
-1, when the message 2 is input, the procedure definition unit 243
-1 is executed according to the procedure definition held by -1. That is, the procedure definition unit 243-1 (a) assigns the character string “water salt sea” to the argument v1 and sets it as string1. (B) The assignment of the second argument is obtained, and the stub holding unit 270-Q
Is assigned to v2. (C) The “water salt sea” is separated into partial character strings by using a blank symbol as a separating symbol to obtain three character strings “water”, “salt”, and “sea”. (D) For the stub holding unit 270-Q, apply ("
water ") send the message.

[Step S13] Upon receiving the message, the stub holding unit 270-Q sends a program corresponding to the algorithm 4 held by the stub code holding unit 272-Q to the message generation unit 250 and sends the message appl
Input with y ("water").

[Step S14] Message generator 25
0 follows algorithm 4 (a) Finds a character string that is the assignment of the first argument. This character string is referred to as string1. (B) “netprotocol, dst: server
r-3, name: object C, method: l
A character string represented by "OKUP, STRING1, STRING2" is generated.

[Step S15] The communication section 210 that has received the message transmits the message to the communication section 310 (remote procedure server 300) corresponding to the server-3 address.

[Step S16] The communication section 310 inputs the received message to the stub extraction section 320. Since the stub extraction unit 320 analyzes the message and does not include stub information, the stub extraction unit 320 searches the remote procedure management unit 330 for a remote procedure holding unit in which the value of the attribute “name” is “object C”. It requests the procedure holding unit obtained as a result of the search to input a character string "lookup (" water ", 2)".

[Step S17] Remote procedure management section 330
Searches the remote procedure holding unit 340-1 in response to the search request, and outputs the message “lookup (“ water ”,
2) Enter ".

[Step S18] Remote procedure holding section 340
-1, when the above message is input, the procedure definition unit 343-
Execute the procedure according to the procedure definition held by 1. That is, the procedure definition unit 343-1 (a) assigns the character string “water” to the argument v1. (B) The integer 2 is assigned to the argument v2. (C) Procedure definition unit 3 using character string "water" as a key
The dictionary of 43-1 is searched, and two words are taken out from the beginning of the result to obtain “water watered”. (D) The procedure definition unit 343-1 transmits the obtained response message “waterwatered” to the communication unit 31.
0 to the communication unit 210.

[Step S19] Similarly, the procedure definition unit 243-1 applies the app 1710 to the object 171-1.
By sending a ly ("salt") message, a response message "salt salta" is obtained.
By transmitting the pply ("sea") message, a response message "sea search" is obtained.

[Step S20] Procedure definition section 243-1
Concatenates the three resulting strings to "wat
er watered salt salt sea
communication section 2
10 to the communication unit 110.

[Second Embodiment] In the second embodiment, a stub class is designated and a stub code is loaded on demand. The difference from the first embodiment is the operation of the stub extraction unit of the server.

This embodiment will be described with reference to FIGS. Hereinafter, a description will be given centering on points unique to the second embodiment.

The stub extraction unit 120 is provided with the communication unit 110
Of the remote procedure call message and the response message of the remote procedure call received from the server, and when the message includes attribute information of the stub, the stub management unit 16
0 is inquired as to whether or not there is a stub holding unit having the same class information among the corresponding attribute information. As a result of the inquiry, if a corresponding stub holding unit exists, the stub managing unit 160 is configured to generate a stub holding unit including attribute information in the message and a stub code holding unit of the searched stub holding unit. Request. If not, request the remote procedure client that sent the stub attribute to send the stub code, and generate a stub holding unit composed of the transmitted stub code and the attribute information in the message. , To the stub management unit 160.

The stub code holding unit 172-2 of the stub holding unit 170-2 holds a program represented by the following algorithm 5.

1. If the method is iterate, go to the next step. Otherwise, end the algorithm. 2. Find the character string that is the assignment of the first argument. This character string is referred to as string1. 3. Find the stub that is the assignment of the second argument. The character string notation of the attribute holding unit of the stub is string2. 4. The attribute values of the attribute “dst” and the attribute “reference” held by the attribute holding unit 171-1 are obtained, respectively,
tval and ref. 5. "Netprotocol, dst: dstva
l, name: ref, method: iterat
e, string1, string2 ”6. If a message requesting the string representation of the entire stub is received as a result of transmitting the generated string, proceed to the next step; otherwise. In this case, proceed to 9. 7. Obtain the character string notation of the stub, which is the assignment of the second argument, and obtain s.
Let it be string3. 8. "Netprotocol, dst: dstva
1. Generate a character string represented by “stub: string3”. 9. Return a response returned as a result of the generation.

The other configuration is the same as that of the first embodiment, and the description will not be repeated.

Next, a specific example of the operation will be described. [Step S1] The remote procedure client 100 starts the method start of the procedure definition unit 143-1 as an initial state.
(“Water salt sea”) is started.

[Step S2] The procedure definition unit 143-1 executes the algorithm 1 according to the definition of the method start. That is, (a) a character string which is an assignment of an argument is obtained, and “water”
“salt sea” is assumed to be string 1. (b) The stub management unit 160 is requested to search for a stub holding unit whose attribute “name” is “170-1” and to return the stub holding unit if it exists. ) Stub management unit 160 to stub holding unit 170-1
And the character string notation of the attribute holding unit is string2
And (D) Message it to stub holding section 170-2
Execute erase (string1, string2).

[Step S3] Stub holding section 170-2
Receives the above message and returns the method iterat
According to the definition of e, the program represented by the algorithm 5 is input to the message generator 150 and executed. That is, (a) A character string which is an assignment of the first argument is obtained. This character string is referred to as string1. (B) Obtain a stub that is an assignment of the second argument. The character string notation of the attribute holding unit of the stub is string2. (C) The attribute “dst” held by the attribute holding unit 171-1
And attribute value of attribute “reference”
server-2 and "object B". (D) "netprotocol, dst: server
r-2, name: object B, method: i
A character string represented by “terate, string1, string2” is generated.

[Step S4] Message generator 150
Transmits the message 1 represented by the character string to the communication unit 110.

[Step S 5] The communication section 110 transmits the message input from the message generation section 150.

[Step S6] The server-2 included in the message 1 is transmitted to the communication unit 210 (the remote procedure server 20).
0), the message 1 is transmitted to the communication unit 21.
0 is received.

[Step S 7] The communication section 210 inputs the received message 1 to the stub extraction section 220.

[Step S8] The stub extraction unit 220 analyzes the message 1 and outputs the “class” attribute value 170-1 included in the attribute storage unit of the stub storage unit 170-1.
Whether there is a stub holding unit having a stub management unit 2
Request search to 60.

[Step S 9] Since there is no corresponding stub holding unit, the stub management unit 260 transmits a request to acquire the entire stub to the communication unit 210.

[Step S10] Stub holding section 170-
2 receives the acquisition request for the entire stub, sets the character string notation stub-170-1 of the stub holding unit 170-1 to “netprotocol, dst: dstva”.
l, stub: generates and transmits a character string represented by stub-170-1 ″.

[Step S11] The stub extractor 220 generates a stub holder, and stores this in the stub holder 2-11-.
Manage as Q.

[Step S12] Next, the stub extractor 22
0 searches the remote procedure management unit 230 for a remote procedure storage unit whose attribute "name" has the value "object B", and iterate ("
"water salt sea", stub holding unit 270
-Q) is output.

[Step S13] Remote procedure management section 230
Searches for the remote procedure holding unit 240-1 in which the value of the “name” attribute is “object B”, and
Enter

[Step S14] Remote procedure holding section 240
-1, when the message 2 is input, the procedure definition unit 243
-1 is executed according to the procedure definition held by -1. That is, procedure definition unit 243-1 performs the following processing. (A) The character string "water salt sea" is assigned to an argument v1, and this is set as string1. (B) The assignment of the second argument is obtained, and the stub holding unit 270-Q
Is assigned to v2. (C) The “water salt sea” is separated into partial character strings by using a blank symbol as a separating symbol to obtain three character strings “water”, “salt”, and “sea”. (D) For the stub holding unit 270-Q, apply ("
water ") send the message.

[Step S15] Upon receiving the message, the stub holding unit 270-Q sends a program corresponding to the algorithm 4 held by the stub code holding unit 272-Q to the message generation unit 250 and sends the message appl
Input with y ("water").

[Step S16] Message generator 25
0 executes the following processing according to algorithm 4. (A) Find a character string that is the assignment of the first argument. This character string is referred to as string1. (B) “netprotocol, dst: server
r-3, name: object C, method: l
A character string represented by "OKUP, STRING1, STRING2" is generated.

[Step S17] The communication section 210 which has input the message transmits the message to the communication section 310 (remote procedure server 300) corresponding to the address of server-3.

[Step S 18] The communication section 310 inputs the received message to the stub extraction section 320. Since the stub extraction unit 320 analyzes the message and does not include stub information, the stub extraction unit 320 searches the remote procedure management unit 330 for a remote procedure holding unit in which the value of the attribute “name” is “object C”. It requests the procedure holding unit obtained as a result of the search to input a character string "lookup (" water ", 2)".

[Step S19] Remote procedure management section 330
Searches the remote procedure holding unit 340-1 in response to the search request, and outputs the message “lookup (“ water ”,
2) Enter ".

[Step S20] Remote procedure holding section 340
-1, when the above message is input, the procedure definition unit 343-
Execute the procedure according to the procedure definition held by 1. That is, procedure definition unit 343-1 performs the following processing. (A) The character string “water” is assigned to the argument v1. (B) The integer 2 is assigned to the argument v2. (C) Procedure definition unit 3 using character string "water" as a key
The dictionary of 43-1 is searched, and two words are taken out from the beginning of the result to obtain “water watered”. (D) The procedure definition unit 343-1 transmits the obtained response message “waterwatered” to the communication unit 31.
0 to the communication unit 210.

[Step S21] Similarly, the procedure definition unit 243-1 applies the app to the object 170-1.
By sending a ly ("salt") message, a response message "salt salta" is obtained.
By transmitting the pply ("sea") message, a response message "sea search" is obtained.

[Step S22] Procedure definition section 243-1
Concatenates the three resulting strings to "wat
er watered salt salt sea
communication section 2
10 to the communication unit 110

Third Embodiment Next, a third embodiment will be described. In this embodiment, an interface definition is transmitted and received. In the first and second embodiments, a program that can be directly executed by hardware is stored as a stub code. In this embodiment, a message is converted using a formal language interpreted and executed by a message generation unit.

FIG. 5 shows the configuration of the remote procedure server according to the third embodiment. The remote procedure can be managed using one or more remote procedure servers shown here. In FIG. 5, the remote procedure server 700 includes a communication unit 710, an interface extraction unit 720, a remote procedure management unit 730, M remote procedure holding units 740-1 to 740-M, a message generation unit 750, An interface management unit 760 and N interface holding units 770-1 to 770-N are included.

Remote procedure holding units 740-1 to 740-M
Are attribute holding units 741-1 to 741-M, respectively.
It is configured to include procedure specification disclosure sections 742-1 to 742-M and procedure definition sections 743-1 to 743-M. The interface holding units 770-1 to 770-N are respectively
It is configured to include attribute holding units 771-1 to 771-N and interface definition holding units 772-1 to 772-N.

The communication unit 710 transmits a remote procedure call message input from the message generation unit 750 to the remote communication unit, and receives a response message from the remote communication unit. The communication unit 710 sets “se
The other communication unit is identified by an address “rver-1”.

The interface extracting unit 720
It analyzes the remote procedure call message and the remote procedure call response message received from 10 and, if the message includes an interface definition, requests the interface management unit 760 to register it. , A corresponding remote procedure holding unit is searched, and a remote procedure call request message or a remote procedure call response is output.

The remote procedure management section 730 searches the remote procedure holding section based on the search request for the remote procedure holding section output from the interface extracting section 720, and issues a remote procedure call request to the searched remote procedure holding section. Output message or remote procedure call response.

The remote procedure holding units 740-1 to 740-M execute the procedure definition held in the procedure definition unit according to the input remote procedure request message. The remote procedure holding units 740-1 to 740-M output an interface search request and an input parameter to the interface definition to the interface management unit 760 during the procedure execution, and receive a response from the interface definition. When,
May be included.

The interface management unit 760 performs a search based on the attributes held by the interface holding units 770-1 to 770-N in response to the interface registration request including the interface attributes and the interface definitions output from the interface extracting unit 720. If the corresponding interface holding unit does not exist, an interface holding unit including an interface attribute and an interface definition is newly created and registered, and the remote procedure managing unit 73
0, the interface holding unit search request and the input parameter to the interface definition are received, and if there is a corresponding interface holding unit, the message generation unit 75
Output interface definition and input parameters to 0.
The message generation unit 750 generates a message by giving the input parameters to the input interface definition and interpreting and executing the interface definition, outputs the generated message to the communication unit 710, and outputs the generated message to the communication unit 710. It analyzes the response message of the called remote procedure and outputs the response to the remote procedure holding unit.

In this embodiment, instead of storing a program that can be directly executed by hardware as a stub code, the message is converted by using a formal language interpreted and executed by the message generator 750. Other configurations and operations are the same as those in the first embodiment, and thus description thereof will not be repeated.

Fourth Embodiment Next, a fourth embodiment will be described. This embodiment uses stubs and
A code is generated and RMI is performed. That is,
In this embodiment, a stub code is generated from an interface definition by using a stub generation unit (stub compiler).

FIG. 6 shows a remote procedure server 800 according to the fourth embodiment.
Is shown. In this figure, parts corresponding to those in FIG. 3 or FIG. 5 are denoted by the corresponding reference numerals, and detailed description thereof will be omitted.

In this embodiment, a stub generation unit 880 is provided, and a stub management unit 860 requests stub generation. The stub management unit 860 executes an operation represented by the following algorithm.

1. The interface definition is input from the interface extracting unit 820, the interface definition is analyzed, and attributes are extracted. 2. The stub holding unit 870 is searched to determine whether there is a stub holding unit that holds the same attribute list. 3. If the stub holding unit does not exist as a result of the determination, the interface definition is input to the stub generating unit 880, and the result is set as the stub code 1. If so, end the algorithm. 4. A stub holding unit that holds the attribute list and the stub code 1 is generated and added.

The stub generator 880 generates a stub code by compiling the input interface definition. Specifically, the interface definition is compiled by the following algorithm similar to that of a normal compiler.

1. Parse the interface definition and generate a parse tree. 2. Performs semantic analysis on the parse tree. 3. Generate code on the target machine from the generated semantic domain output.

The other components have the same functions as those of the above-described embodiment, and thus the description thereof will be omitted.

[0111]

As described above, according to the present invention, it is possible to execute a remote procedure call by sequentially tracing a plurality of servers without considering whether the server has desired interface information. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a remote procedure client according to the first embodiment.

FIG. 3 is a block diagram illustrating a configuration of a remote procedure server according to the first embodiment.

FIG. 4 is a block diagram illustrating a configuration of another remote procedure server according to the first embodiment.

FIG. 5 is a block diagram illustrating a configuration of a third embodiment.

FIG. 6 is a block diagram illustrating a configuration of a fourth embodiment.

[Explanation of symbols]

 100 remote procedure client 200, 300, 700, 800 remote procedure server 210 communication unit 220 stub extraction unit 230 remote procedure management unit 240 remote procedure holding unit 250 message generation unit 260 stub management unit 400 network 270 stub holding unit 720 interface extraction unit 760 Interface management unit 770 Interface holding unit 880 Stub generation unit

Claims (8)

[Claims] 1. A remote procedure server for executing a remote procedure call to another remote procedure server in response to a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network, Communication means for receiving a remote procedure call message and transmitting a procedure call response; analyzing the received procedure call message to extract a remote procedure search request and a remote procedure call; and providing a stub code to the procedure call message If the stub information includes stub information, stub extraction means for extracting the stub information, remote procedure holding means for holding a procedure, and remote procedure holding based on a remote procedure search request extracted by the stub extraction means Remote procedure management means for searching means, and stub holding means for holding stub information A stub management unit that manages the stub holding unit based on stub information extracted by the stub extraction unit; and a message that generates a message to another remote procedure server by executing a stub code held by the stub holding unit. Generating means, and the remote procedure holding means, comprising: an attribute holding means for holding an attribute attached to the remote procedure holding means; and a procedure executing means for executing a procedure according to an input message. The remote procedure search means searches for a remote procedure holding means corresponding to the remote procedure search message by inputting a remote procedure search message which is a message for designating the remote procedure holding means. Inputting a message given by the stub extracting means, and executing a procedure according to the message. The stub holding means includes: an attribute holding means for holding an attribute associated with the stub holding means; and a stub for holding a stub code for generating a message for the remote procedure holding means. A code holding unit, wherein the stub management unit searches the stub holding unit according to the stub information output from the stub extraction unit, and newly registers stub information when there is no corresponding stub information. The message generating unit inputs the attribute of the transmission target to the stub management unit, issues a search request, and inputs the execution result input from the procedure execution unit to the obtained stub code, whereby the communication unit A remote procedure server for generating a message. 2. A remote procedure server for executing a remote procedure call to another remote procedure server in response to a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network, Communication means for receiving a remote procedure call message and transmitting a procedure call response; analyzing the procedure call message to extract a remote procedure search request and a procedure call; and stub information comprising a stub attribute in the procedure call message Is included, stub extracting means for extracting the stub information, remote procedure holding means for holding remote procedures, and searching for the remote procedure holding means based on a remote procedure search request extracted by the stub extracting means. Remote procedure management means; stub holding means for holding stub information; Stub management means for managing the stub holding means based on stub information generated by the stub extraction means; and message generation for generating a message to another remote procedure server by executing a stub code held by the stub information holding means. The remote procedure holding means has attribute holding means for holding an attribute attached to the remote procedure holding means, and a procedure executing means for executing a procedure in accordance with an input message. The procedure search means is for searching for a remote procedure holding means corresponding to the remote procedure search message by inputting a remote procedure search message which is a message for designating the remote procedure holding means, Inputting a message given by the stub extracting means and executing a procedure according to the message; Wherein the stub holding unit is an attribute holding unit that holds an attribute associated with the stub holding unit, and a stub code holding unit that holds a stub code for generating a message for the remote procedure holding unit. The stub management unit searches the stub holding unit according to stub information output from the stub extraction unit, and when there is no stub code corresponding to the stub information, stub management of another remote procedure server Inquiry is made to the means, and if there is a stub code as a result of the inquiry, the stub code is registered.The message generation means inputs a transmission target attribute to the stub management means and issues a search request. To the communication means by inputting the execution result input from the procedure execution means to the stub code Remote procedure management apparatus characterized by generating a message. 3. A remote procedure server for executing a remote procedure call to another remote procedure server in response to a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network, Communication means for receiving a remote procedure call message and transmitting a procedure call response; analyzing the procedure call message to extract a remote procedure search request and a procedure call; and including an interface definition language in the procedure call message When the interface information is included, an interface extracting means for extracting the interface information; a remote procedure holding means for holding a procedure; and searching the remote procedure holding means based on a remote procedure search message extracted by the interface extracting means. Remote procedure search means to perform Interface holding means for holding interface information; interface managing means for managing the interface holding means based on interface information generated by the interface extracting means; and interpreting the message by interpreting the interface information held by the interface information holding means. Message generating means for generating the remote procedure, the remote procedure holding means having an attribute holding means for holding an attribute attached to the remote procedure holding means, and a procedure executing means for executing a procedure in accordance with an input message. The remote procedure search means searches for a remote procedure holding means corresponding to the remote procedure search message by inputting a remote procedure search message which is a message for designating the remote procedure holding means. The execution means includes the A message provided by the interface extracting means, and executing a procedure in accordance with the message. The interface holding means holds an attribute definition holding an attribute associated with the interface holding means, and holds an interface definition. The interface management means searches the interface holding means in accordance with the interface information output from the interface extracting means, and registers the new interface information if there is no corresponding interface information. The message generation unit inputs the attribute of the transmission target to the interface management unit, issues a search request, and inputs the obtained interface information and the execution result input from the procedure execution unit. Remote procedure server, characterized in that the message generation for signal means. 4. A remote procedure server for executing a remote procedure call to another remote procedure server in response to a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network, Communication means for receiving a remote procedure call message and transmitting a procedure call response; analyzing the procedure call message to extract a remote procedure search request and a procedure call; and interface information comprising interface attributes in the procedure call message Is included, an interface extracting means for extracting the interface information, a remote procedure holding means for holding a procedure, and a remote for searching the remote procedure holding means based on a remote procedure search request extracted by the interface extracting means. Procedure management means and interface Interface holding means for holding the interface information, interface managing means for managing the interface holding means based on the interface information generated by the interface extracting means, and other interfaces by interpreting the interface definition held by the interface information holding means. Message generating means for generating a message for a remote procedure server, wherein the remote procedure holding means executes an attribute according to the input message; and an attribute holding means for holding an attribute attached to the remote procedure holding means. The remote procedure search means having a remote procedure search message, which is a message for specifying the remote procedure holding means, as input, and searching for a remote procedure holding means corresponding to the remote procedure search message. The execution of the procedure Means for inputting a message given by the interface extracting means, and executing a procedure according to the message, wherein the interface holding means holds an attribute associated with the interface holding means;
Interface definition holding means for holding an interface definition serving as a template for generating a message for the remote procedure holding means, wherein the interface management means is provided in accordance with an interface attribute output from the interface extraction means. If there is no interface holding means corresponding to the interface attribute, an inquiry is made to the interface management means of another remote procedure server, and if there is an interface holding means as a result of the inquiry, this is registered, and the message generation is performed. Means for inputting an attribute of an interface to be used to the interface management means, issuing a search request, and inputting an execution result input from the procedure execution means to the obtained interface code. Remote procedure servers and generates a message that to serial communication means. 5. A remote server for executing a remote procedure call to another remote procedure server in response to a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network. Communication means for receiving a procedure call message and transmitting a procedure call response, analyzing the procedure call message, extracting a remote procedure search request and a procedure call, and including interface information including an interface definition language in the procedure call message. If included, interface extraction means for extracting the interface information; remote procedure holding means for holding a procedure; remote procedure for searching the remote procedure holding means based on a remote procedure search message extracted by the interface extraction means Search means and Star Stub holding means for holding information; stub management means for managing the stub holding means based on stub information generated by the stub extraction means; and stub generation for outputting a stub code from an interface definition language output by the interface extraction means. Means, and a message generating means for generating a message to another remote procedure server by executing a stub code held by the stub information holding means, wherein the remote procedure holding means includes: An attribute holding unit for holding the attached attribute; and a procedure execution unit for executing a procedure in accordance with the input message. The remote procedure search unit includes a remote Remote input corresponding to the remote procedure search message by inputting the procedure search message Searching for a procedure holding means, wherein the procedure executing means inputs a message given by the interface extracting means and executes a procedure according to the message; and the stub holding means corresponds to the stub holding means. Attribute holding means for holding an attached attribute; and stub code holding means for holding a stub code for generating a message for the remote procedure holding means, wherein the stub management means includes the interface extraction means. According to the interface information output from the stub holding unit, if there is no corresponding stub information, the interface information is input to the stub generating unit, and the resulting stub attribute and stub code are newly registered. Wherein the message generating means sets the attribute to be transmitted A message to be sent to the communication means is generated by inputting a search request by inputting to the stub management means and inputting an execution result input from the procedure execution means to the obtained stub code. Remote procedure server. 6. A remote procedure server for executing a remote procedure call to another remote procedure server in response to a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network. Communication means for receiving the procedure call message and transmitting a procedure call response, analyzing the procedure call message, extracting a remote procedure search request and a procedure call, and including interface information including an interface attribute in the procedure call message. If included, interface extraction means for extracting the interface information; remote procedure holding means for holding a procedure; remote procedure for searching the remote procedure holding means based on a remote procedure search message extracted by the interface extraction means Search means and Star Stub holding means for holding information; stub management means for managing the stub holding means based on stub information generated by the stub extraction means; and stub generation for outputting a stub code from an interface definition output by the interface extraction means. Means, and a message generating means for generating a message to another remote procedure server by executing a stub code held by the stub information holding means, wherein the remote procedure holding means includes: Attribute holding means for holding the attached attribute; and procedure execution means for executing a procedure in accordance with the input message. The remote procedure search means is a remote message which is a message for designating the remote procedure holding means. Remote input corresponding to the remote procedure search message by inputting the procedure search message Searching for a procedure holding means, wherein the procedure executing means inputs a message given by the interface extracting means and executes a procedure according to the message; and the stub holding means corresponds to the stub holding means. Attribute holding means for holding the attached attribute, and stub code holding means for holding a stub code for generating a message for the remote procedure holding means, the stub management means, from the interface extraction means According to the output interface attribute, the stub holding unit is searched, and if there is no corresponding stub information, an inquiry is made to the interface management unit of another remote procedure server. Stub generating means for obtaining the obtained interface definition Enter, stub obtained as a result
Registering a code, the message generating unit inputs a transmission target attribute to the stub management unit, issues a search request, and inputs an execution result input from the procedure execution unit to the obtained stub code. A remote procedure server for generating a message to the communication means. 7. The remote procedure holding means according to claim 1, wherein said remote procedure holding means has a procedure specification publishing means for outputting a procedure specification which is information on a specification of a procedure realized by said remote procedure holding means. 7. The remote procedure server according to 5 or 6. 8. A remote procedure management method for managing a remote procedure call in a network information system in which a plurality of computer systems for performing information processing are connected via a network, wherein a client transmits a remote procedure call to a first server together with stub information. Registering the stub information in a first server; and transmitting a remote procedure call from the first server to a second server using the registered stub information. Characterized remote procedure management method.