JP2013161162A - Distributed system, version information distribution method, and version information distribution program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit a communication error due to a mismatch between protocol versions, without accessing an external system to acquire version information of a protocol.SOLUTION: A device 2 comprises storage means 24 which stores version information of a protocol used when communicating with other devices in a distributed system, version management means 21 which manages storage means 24, and version distribution means 22 which transmits the version information of the protocol used in the own device to the other devices and receives the version information of the protocol used in the other devices from the other devices. The version management means 21 updates the version information of the own device in the storage means 24 and notifies all the other devices about the changed version information when the version of the protocol in the own device is changed, and updates the version information of another device in the storage means when change notification about the version information of the protocol in the other device is received from the other device.

Description

  The present invention relates to a distributed system that distributes version information of a protocol used by each device, a distribution method of version information, and a version information distribution program in a distributed system in which a plurality of devices cooperate with each other via a network.

  When communication is performed between a plurality of devices, a communication error may occur because the version of the protocol used for communication is different in each device. In order to avoid such a communication error, for example, Patent Document 1 has a function for centrally managing the protocol version, and the protocol version based on the requested service before the application sends the dialog start request. A technique is described in which the management function unit is inquired to select a protocol version supported by itself and perform communication.

JP 2000-299713 A

 However, in Cited Document 1, it is necessary to inquire about the version by accessing the protocol version management function unit that centrally manages the protocol version each time a dialog start request is sent. That is, every time a dialog start request is sent, communication to the protocol version management function unit occurs. For this reason, communication delay due to access to the protocol version management function unit and the load on the network become problems.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a distributed system that prevents communication errors due to protocol version mismatches without accessing the external system and acquiring protocol version information. And providing a version information distribution method and a version information distribution program.

  To achieve the above object, the present invention provides a distributed system in which a plurality of devices cooperate with each other via a network, and the device communicates with each other device of the distributed system for each of the plurality of devices. Storage means for storing the version information of the protocol used at the time, the version management means for managing the storage means, and the version information of the protocol used by the own apparatus to the other apparatus, and from the other apparatus to the other apparatus Version distribution means for receiving version information of the protocol to be used, and the version management means updates the version information of the own apparatus of the storage means when the version of the protocol used by the own apparatus is changed The version information after the change is notified to all other devices using the version distribution means. The change notification of the version information of the protocol to be used in the other devices from the case of receiving with the version distribution means, and updates the version information of the other devices of the storage means.

  The present invention relates to a method for distributing version information of a protocol used when communicating with other devices of a distributed system in a distributed system in which a plurality of devices cooperate with each other via a network. An update step of updating the version information of the own device in the storage unit when the version of the protocol used in the own device is changed. A notification step for notifying all other devices of the version information after the change of the device, and when the version of the protocol used in the other device is changed, the version information of the protocol used in the other device is changed from the other device A receiving step for receiving a notification, and an updating step for updating version information of the other device in the storage unit , It carried out.

  The present invention relates to a version information distribution program executed by the device in a distributed system in which a plurality of devices cooperate with each other via a network, and the device is added to each of the plurality of devices in addition to the distributed system. Storage means for storing version information of a protocol used when communicating with the apparatus, version management means for managing the storage means, and protocol version information used in its own apparatus are transmitted to another apparatus, and from other apparatuses The version management unit functions as a version distribution unit that receives version information of a protocol used in the other device. When the version of the protocol used in the own device is changed, the version information of the own device in the storage unit And update the version information after the change When notifying all other devices using the communication means and receiving a change notification of the version information of the protocol used by the other devices from the other device using the version distribution means, the other device of the storage means Update version information.

  According to the present invention, it is possible to provide a distributed system, a version information distribution method, and a version information distribution program that prevent a communication error due to a mismatch of protocol versions without accessing the external system and acquiring protocol version information. Can do.

1 is an overall configuration diagram of a distributed system according to an embodiment of the present invention. It is a block diagram which shows the structure of the internal device which concerns on this embodiment. It is a figure which shows an example of a version information storage part. It is a figure which shows an example of a destination information storage part. It is a flowchart which shows the operation | movement at the time of initial starting. It is a flowchart which shows the operation | movement at the time of version upgrade. FIG. 7 is a sequence diagram showing an operation of each internal device at the time of version upgrade shown in FIG. 6.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an overall configuration of a distributed system according to the present embodiment. A distributed system 1 shown in FIG. 1 includes a plurality of internal devices 2, and these internal devices 2 are connected to an internal network 4 and cooperate with each other via the internal network 4. Further, it is assumed that a predetermined internal device 2 (in the illustrated example, the internal device A) of the distributed system 1 is connected to the external network 5 and can be connected to the external device 3. Although the illustrated distributed system 1 shows three internal devices 2 as an example, the number of internal devices is not limited to this.

  In the distributed system 1 of the present embodiment, the program module of each internal device 2 communicates with another device when processing is performed in cooperation with another internal device 2 (hereinafter referred to as “other device”). Use the cooperation protocol module. In this embodiment, the version information when the program module and the cooperation protocol module are upgraded is distributed to each internal device 2 in the distributed system 1.

  FIG. 2 is a block diagram showing the configuration of the internal device 2 of the present embodiment. In the present embodiment, each internal device 2 manages the version information of all the internal devices 2 in the distributed system 1 and distributes / distributes the version information of its own device in the distributed system 1. The illustrated internal device 2 includes a version management unit 21, a version distribution unit 22, a version upgrade unit 23, a version information storage unit 24, a destination information storage unit 25, a program module 26, and a version selection unit 27. Prepare.

  The version management unit 21 manages version information of each internal device 2 stored in the version information storage unit 24. Specifically, the version information of the own device is notified to all other devices in the distributed system 1 using the version distribution unit 22 at the time of initial startup. Further, the version management unit 21 acquires the upgrade information of the program module 26 or the cooperation protocol module via the upgrade unit 23 and updates the version information of the own device in the version information storage unit 24. Further, when the version management unit 21 receives a change notification of version information of another device via the version distribution unit 22, the version management unit 21 registers or updates the changed version information of the other device in the version information storage unit 24.

  The version information storage unit 24 stores each program module that operates in its own device and other devices, and version information of the cooperation protocol module used by the program module.

  FIG. 3 is a diagram illustrating an example of the version information storage unit 24. In the illustrated version information storage unit 24, an internal device name, a program module, version information of the program module, and version information of the cooperation protocol module used by the program module are stored in association with each other.

  A unique name (identification information) within the distributed system 1 is used for the internal device name and the program module. Further, in order to distribute the version information of the own device to other devices, it is assumed that information capable of identifying which internal device is the own device is added to the internal device name. In the example shown in the figure, the information of “own device” is added to the internal device name “A”, indicating that it is the version information storage unit 24 of the internal device A.

  The version information of the cooperation protocol module is set with the versions of all the cooperation protocol modules that can use the corresponding program module. In the example illustrated in FIG. 3, the version of the cooperation protocol module that can be used by the Mod2 program module of the internal device A is “1” and “2”.

  The program module and the link protocol module used by the program module are basically one-to-one. For example, the link protocol module corresponding to the Mod1 program module is a Mod1 link protocol module. When one program module uses a plurality of cooperation protocol modules, identification information is set such that each cooperation protocol module is unique in the distributed system.

  The version distribution unit 22 notifies the version information of the own device to the other device, receives the version information of the other device from the other device, and sends it to the version management unit 21. Specifically, when the version information is sent from the version management unit 21, the version distribution unit 22 notifies / transmits version information to all other devices of the distribution system 1 registered in the destination information storage unit 25. To do. In addition, the version distribution unit 22 receives version information transmitted by each of the other devices, and sends the received version information to the version management unit 21. As a result, the version management unit 21 registers or updates the version information of the other device in the version information storage unit 24. In addition, when transmitting version information of its own device to another device, the version distribution unit 22 performs queuing processing, etc., if transmission / reception of other version information is not completed, After the transmission / reception is completed, the version information is transmitted.

  Note that the protocol used when the version distribution unit 22 transmits / receives version information to / from other devices is a protocol other than the cooperation protocol used when the program module communicates / cooperates with other devices (for example, TCP). It is. As a result, version information can be transmitted and received without being affected by the upgrade of the program module.

  Further, if normal version information cannot be used due to communication abnormality or data corruption, forking or the like may be performed. It is conceivable that the version information when communicating by forking or the like is transmitted via the interface with the version management unit 21 and reflected.

  Also, the version distribution unit 22 refers to the destination information storage unit 25, acquires the destination information of each other device, and transmits the version information of the own device to the other device using the acquired destination information.

  FIG. 4 is an example of the destination information storage unit 25. The destination information storage unit 25 stores destination information of all other devices in the distributed system 1, and the destination information storage unit 25 shown in the figure stores the internal device name and destination information of each other device in association with each other. ing. The internal device name is identification information unique within the distributed system 1. The destination information is address information necessary for communication with another device, and for example, an IP address, a port number, or the like can be used.

  The version upgrade unit 23 upgrades the program module and the cooperation protocol module.

  The program module 26 is a module that performs application processing in cooperation with other devices. In the program module 26 of the present embodiment, a cooperation protocol module that can be used when communicating with other devices is incorporated as a submodule. In this case, it is assumed that all versions of the cooperation protocol modules that can be used in the version of the program module 26 are incorporated in the program module 26. The cooperation protocol module may be an independent module different from the program module 26. The cooperation protocol module is a module for communicating with other devices.

  When the program module 26 communicates with another device, the version selection unit 27 displays the version information of the cooperation protocol module of the own device stored in the version information storage unit 24 and the version of the cooperation protocol module of the other device of the communication partner. The information is compared, the version of the cooperation protocol module that can be used mutually for communication with the other apparatus is selected, and the selection result is instructed to the program module 26. Thereby, the program module 26 can communicate using the version of the cooperation protocol module which can be used mutually. That is, a communication error due to version mismatch can be prevented.

  The function of the version selection unit 27 may be incorporated in each program module 26.

  As each internal device 2 described above, for example, a general-purpose computer system including a CPU, a memory, an external storage device such as an HDD, an input device, and an output device can be used. In this computer system, each function of the internal device 2 is realized when the CPU executes a program for the internal device 2 loaded on the memory. The program for the internal device 2 can be stored in a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, a DVD-ROM, or can be distributed via a network.

  Next, the operation of this embodiment will be described.

  FIG. 5 is a flowchart illustrating an operation example at the time of initial startup (for example, power ON).

  In the operation example shown in FIG. 5, when the internal device A is initially activated, the internal device B notifies the internal device B and the internal device C which are other devices, and the internal device B which has received the version information of the internal device A In this operation, a response including version information of the own device is transmitted to the internal device A. S11 to S13 and S16 to S18 are operations of the internal device A, and S14 and S15 are operations of the internal device B.

  First, at the time of initial startup, the version management unit 21 of the internal device A determines the version information (own device name, program module, program module version, cooperation protocol module version) from the setting file (for example, Configuration file). And the like are set and registered as version information of the own device in the version information storage unit 24. Then, the version management unit 21 sends the version information of the own device set in the version information storage unit 24 to the version distribution unit 22 (S11).

  When the version distribution unit 22 of the internal device A receives the version information of the own device, the version distribution unit 22 refers to the destination information storage unit 25 in order to distribute the version information to other devices in the distributed system. The destination information is acquired (S12). Then, the version distribution unit 22 transmits the version information of its own device to each of the other devices using each acquired destination information (S13). Here, the version distribution part 22 shall transmit the version information of an own apparatus to the internal apparatus B and the internal apparatus C which are other apparatuses.

  The version distribution unit 22 of the internal device B receives the version information of the internal device A transmitted in S13 and sends the received version information to the version management unit 21. The version management unit 21 sets the received version information of the internal device A in the version information storage unit 24 (S14). At this time, it is assumed that the internal device B performs the same processing as S11, and the version information of the own device is already set in the version information storage unit 24.

  After setting the version information of the internal device A, the version management unit 21 of the internal device B sends the version information of the own device (internal device B) set in the version information storage unit 24 to the version distribution unit 22. The version distribution unit 22 transmits a response (reply) including the version information of the own device to the internal device A (S15).

  The internal device C also performs the processing of S14 and S15, and transmits a response including the version information of the own device (internal device C) to the internal device A.

  The version distribution unit 22 of the internal device A that has transmitted the version information in S13 monitors the response (reply) from each of the other devices (internal devices B and C), and the other device that has received the response (S16: response is present) The response is sent to the version management unit 21. The version management unit 21 sets the version information of the internal device B (or internal device C) included in the response in the version information storage unit 24 (S17).

  On the other hand, if the other device does not respond or the version information of the other device is not included in the response (S16: no response), setting in the version information storage unit 24 is not performed (S18). In this case, the version distribution unit 22 notifies the version management unit 21 that there is no response. As described above, when the version information of the other apparatus cannot be acquired at the initial startup, an initial value may be set and updated at the next version upgrade.

  FIG. 5 illustrates an example in which the internal device A notifies the version information of the own device to the internal devices B and C, and the internal devices B and C transmit the version information of the own device to the internal device A as a response. However, each of the internal devices B and C also notifies the version information of the own device to the other device, and the other device transmits the version information of the own device to the internal devices B and C as a response. Thereby, in all internal devices of the distributed system 1, the version information of the own device and other devices can be distributed and held in the version information storage unit 24.

  FIG. 6 is a flowchart showing the operation when the version upgrade of the program module or the like is performed after the distribution of the version information at the initial startup. FIG. 6 illustrates an example of an operation in which version upgrade is performed by the internal device A, and the version information changed by the version upgrade is notified to the internal devices B and C.

  First, the version upgrade unit 23 of the internal device A upgrades a predetermined program module or cooperation protocol module (S21). The version management unit 21 acquires version upgrade information of the module upgraded from the version upgrade unit 23 (S22).

  The upgrade information is acquired when notified from the upgrade unit 23 to the version management unit 21 or when the version management unit 21 monitors the upgrade unit 23. The version upgrade information includes the upgraded program module, the version of the program module, the version of the cooperation protocol module, and the like.

  The version management unit 21 that has acquired the upgrade information updates the version information of its own device in the version information storage unit 24 using the upgrade information (S23). In the example shown in FIG. 6, the version of the program module Mod1 is updated from “1” to “2”, so that the version of the protocol protocol module for Mod1 that can use Mod1 of version 2 is changed from “1” to “1 and 2”. It has been updated. In this way, by setting all available versions in the version information of the cooperation protocol module, it is possible to select a version that is common to each other when the program module communicates with another device.

  The version management unit 21 sends the version information of its own device updated in the version information storage unit 24 to the version distribution unit 22 (S24).

  At this time, the version distribution unit 22 determines whether notification of other version information other than the version information, such as a program module updated by another version upgrade, is being implemented (S25). The version distribution unit 22 monitors the response from the other device after transmitting the version information of its own device, and when receiving the response from all the other devices, determines that the notification of the version information is completed, Until the response from is received, it is determined that the operation is in progress.

  In the case of implementation (S25: YES), the version distribution unit 22 queues the version information in a memory (not shown) or the like for data guarantee of the version information storage unit 24 (S26), and other version information After the notification is completed, this version information is transmitted to the other devices (internal devices B and C). In addition to queuing, it is also possible to use a method based on data management or transactions.

  If not implemented (S25: NO), the version information of the own device changed by the version upgrade is transmitted to each other device (internal devices B and C) by the same processing as S13 to S18 in FIG. The other device updates the version information of the internal device A in the version information storage unit 24 of the other device using the received version information, and transmits a response to the internal device A (S27). The response in this case does not include the version information of the other device.

  When the internal device A receives responses from all other devices, the distribution of version information at the time of version upgrade is completed.

  FIG. 7 is a sequence diagram showing the operation of each internal device at the time of version upgrade shown in FIG. In the illustrated example, in the initial state, the version of the predetermined program module of the internal devices A, B, and C is “1”, and the version of the cooperation protocol module that can be used by the program module is only “1”. It shall be.

  In this state, the internal device A is upgraded, the program module version is updated to “2”, and the corresponding cooperation protocol module version is updated to “1 and 2” (S31). As a result, the version information of the own device in the version information storage unit 24 of the internal device A is updated, and a change notification of the version information is transmitted to the internal devices B and C (S32). Upon receiving the version information change notification, the internal devices B and C update the version information of the internal device A in the version information storage unit 24 and send a response to the internal device A (S33).

  At this time, the internal device A and the internal device B communicate with each other by using the cooperation protocol module of the version “1” common to both (S34). That is, in the internal device A, when receiving an external signal from the external device 3 (S35), the version selection unit 27 sends the version information of the cooperation protocol stored in the version information storage unit 24 and the internal device of the communication partner. The version information of the cooperation protocol of B is compared, the version “1” of the cooperation protocol that can be used mutually is selected, and the selected version is instructed to the program module. When there are a plurality of mutually usable versions (that is, common versions), the maximum version is selected.

  The program module of the internal device A transmits a cooperation signal to the internal device B using the cooperation protocol module of the version “1” selected by the version selection unit 27 (S36), and the program module of the internal device B also has the version “1”. The cooperation signal response is transmitted to the internal device A using the cooperation protocol module "S37". Then, the internal device A transmits an external signal response to the external device 3 based on the cooperation signal response (S38).

  In the internal device B, the version is upgraded, the version of the program module is updated to “2”, and the version of the corresponding cooperation protocol module is updated to “1 and 2” (S39). Thereby, the version information of the own device in the version information storage unit 24 of the internal device B is updated, and a change notification of the version information is transmitted to the internal devices A and C (S40). Upon receiving the version information change notification, the internal devices A and C update the version information of the internal device B in the version information storage unit 24 and send a response to the internal device B (S41).

  At this time, the version of the cooperation protocol module common to both the internal device A and the internal device B is “1 and 2”. Communication is performed using the program module of the larger version “2” (S42). That is, when the internal device A receives an external signal from the external device 3 (S43), the version selection unit 27 compares the version information of the cooperation protocol of the own device and the internal device B stored in the version information storage unit 24. Select the maximum “2” among the mutually usable versions, and instruct the selected version to the program module.

  The program module of the internal device A transmits the cooperation signal to the internal device B using the cooperation protocol module of the version “2” selected by the version selection unit 27 (S44), and the program module of the internal device B also has the version “2”. The cooperation signal module is transmitted to the internal device A using the cooperation protocol module (S45). Then, the internal device A transmits an external signal response to the external device 3 based on the cooperation signal response (S46).

  S47 to S49 are the operations of the internal device C that has been upgraded, and since this is the same as the operations of S31 to S33, description thereof is omitted here.

  As described above, in this embodiment, each internal device in the distributed system performs initial activation or version upgrade, whereby the version information is distributed to other devices in the distributed system.

  In the present embodiment described above, version information is stored in the distributed system in response to the version upgrade of the program module for cooperation (communication) between internal devices in the distributed system or the cooperation protocol module used by the program module. It is automatically distributed (distributed) to each internal device. Thereby, in this embodiment, each internal device can hold the version information storage unit 24 in which the version information of the cooperation protocol module of the own device and the other device is stored. Past version information can be managed.

  In addition, each internal device holds the version information storage unit 24 so that when performing a cooperative operation (communication or the like) with another device, it accesses an external system such as a management device and acquires version information of the other device. Without having to acquire the version information of the other device in the local device, select the version of the cooperative protocol that can be used between the local device and the partner device, and communicate with the version of the optimal cooperation protocol at that time. It can be carried out. Therefore, even if there is a difference in the version of the available cooperation protocol between the local device and the cooperation destination, each internal device can share the mutual version information in advance, so that the optimum cooperation protocol version can be obtained. You can choose.

  In addition, this invention is not limited to the said embodiment, Many deformation | transformation are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 1: Distributed system 2: Internal apparatus 21: Version management part 22: Version distribution part 23: Version upgrade part 24: Version information storage part 25: Destination information storage part 26: Program module 3: External apparatus 4: Internal network 5: External network

Claims (8)

A distributed system in which a plurality of devices cooperate with each other via a network,
The device is
For each of the plurality of devices, storage means for storing protocol version information used when communicating with other devices of the distributed system;
Version management means for managing the storage means;
Version distribution means for transmitting the version information of the protocol used in the own device to another device and receiving the version information of the protocol used in the other device from the other device, and
The version management means includes
When the version of the protocol used by the own device is changed, update the version information of the own device of the storage means, and notify all other devices of the changed version information using the version distribution means,
Update notification of the version information of the protocol used in the other device from the other device using the version distribution means, updating the version information of the other device in the storage means;
Distributed system characterized by The distributed system according to claim 1,
The device is
A version that compares the version information of the own device stored in the storage unit with the version information of the other device of the communication partner and selects the protocol version used for communication with the other device when communicating with the other device. The distributed system further comprising a selection unit. The distributed system according to claim 1 or 2,
The version distribution means is:
When transmitting / receiving the version information of the protocol used by the own device to another device, if the transmission / reception of the other version information is not completed, the version information is transmitted after the transmission / reception of the other version information is completed. Distributed system characterized by The distributed system according to any one of claims 1 to 3,
The distributed system characterized in that the version distribution means transmits / receives version information using a protocol for transmitting / receiving version information different from a protocol used when communicating with the other device. In a distributed system in which a plurality of devices cooperate with each other via a network, a protocol version information distribution method used when communicating with other devices of the distributed system,
The device is
A storage unit that stores version information of the protocol for each of the plurality of devices,
If the protocol version used on the local device is changed,
An update step of updating version information of the own device of the storage unit;
And a notification step for notifying all other devices of the version information after the change of the own device,
If the protocol version used by another device has changed,
A receiving step of receiving a change notification of the version information of the protocol used in the other device from the other device;
Performing an update step of updating version information of the other device in the storage unit,
Version information distribution method characterized by A distribution method of version information according to claim 5,
The device is
When communicating with another device, the version information of the protocol of the own device stored in the storage unit is compared with the protocol version information of the other device of the communication partner, and the protocol version used for communication with the other device And a selection step of selecting the version information distribution method. A distribution method of version information according to claim 5 or 6,
The device is
When notifying the other device of the version information of the protocol used in its own device, further performing a determination step of determining whether the notification processing of the other version information has been completed,
The notifying step notifies the version information to another apparatus after completion of the transmission / reception of the other version information when the notification process is not completed. A version information distribution program executed by the device in a distributed system in which a plurality of devices cooperate with each other via a network,
Said device,
Storage means for storing protocol version information used when communicating with other devices of the distributed system for each of the plurality of devices,
Version management means for managing the storage means; and
The version information of the protocol used in its own device is transmitted to the other device and functions as a version distribution means for receiving the version information of the protocol used in the other device from the other device,
The version management means includes
When the version of the protocol used by the own device is changed, update the version information of the own device of the storage means, and notify all other devices of the changed version information using the version distribution means,
Update notification of the version information of the protocol used in the other device from the other device using the version distribution means, updating the version information of the other device in the storage means;
Version information distribution program characterized by

Images