JP3791700B2 - Virtual terminal connection type distributed service system - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a distributed processing system that shares information processing among a plurality of processing nodes and implements services using inter-node communication, and more particularly, in a distributed service environment in which a plurality of service implementing entities exist in a distributed manner. The present invention relates to a virtual terminal connection type distributed service system in which a plurality of service realization entities cooperate with each other to realize a service request via a virtual terminal.
[0002]
[Prior art]
A distributed service environment is an environment in which service realization entities exist in a distributed manner in an environment where a service requesting entity and a service realization entity that realizes a service request exist. The service implementing entity used in the service environment corresponds to a program module on the memory of the information processing apparatus that executes a series of tasks such as information retrieval.
[0003]
For a conventional connection method in such a distributed service environment, refer to a block diagram showing a schematic configuration of a conventional distributed service system shown in FIG. 7 and a block diagram showing more specifically the distributed service system of FIG. 7 shown in FIG. To explain.
[0004]
The distributed service environment shown in FIGS. 7 and 8 includes nodes X, Y, and Z, and each node is realized by an information processing apparatus such as a workstation or a personal computer. For example, in FIG. 7, a node X is a service implementation entity A (111) and a service implementation entity B (112), a node Y is a service implementation entity α (113), and a node Z is a service implementation entity β (114). There shall be.
[0005]
When service implementation entity A (111) implements a service request in cooperation with service implementation entity α (113), entity 1 (115) required for connection is incorporated into service implementation entity A (111) and required for connection Entity 3 (117) is incorporated in the service realization entity α (113). The service implementation entity A (111) establishes connection with the service implementation entity α (113) via the entity 1 (115) necessary for connection and the entity 3 (117) necessary for connection. The entity 1 (115) required for connection at this time includes “node Y connection processing”, “node Y service request conversion processing”, and “node Y disconnection processing” as shown in FIG.
[0006]
When the service implementation entity B (112) realizes a service request in cooperation with the service implementation entity β (114), the entity 2 (116) required for connection is incorporated into the service implementation entity B (112) and is necessary for connection. Entity 4 (118) is incorporated into the service implementation entity β (114). The service realization entity B (112) performs connection with the service implementation entity β (114) via the entity 2 (116) necessary for connection and the entity 4 (118) necessary for connection. The entity 2 (116) required for connection at this time is provided with “node Z connection processing”, “node Z service request conversion processing”, and “node Z disconnection processing” as shown in FIG.
[0007]
The entity 1 (115) required for the connection incorporated in the service realization entity A (111) is effective for the connection only with the service realization entity α (113). Can not. Entity 2 (116) required for connection incorporated in the service implementation entity B (112), Entity 3 (117) required for connection incorporated in the service implementation entity α (113), Service implementation entity β (114 The same applies to the entity 4 (118) required for the connection incorporated in ().
[0008]
[Problems to be solved by the invention]
As described above, in the conventional distributed service environment in which a plurality of types of service implementation entities exist in a distributed manner, there is a problem that service implementation means corresponding to the types are required, and from the service implementation entity A (111). In order to dynamically connect the service realization entity α (113) and the service realization entity β (114), the entity 1 (115) required for connection and the entity 2 (116 required for connection) ), And the burden on the service implementing entity A (111) increases. Further, there is a problem that the service implementation entity A (111) needs to be modified every time the service implementation entity to be connected increases or decreases.
[0009]
The present invention has been made in view of the above, and an object of the present invention is to appropriately connect connections between service implementing entities without affecting the service implementing entities even when the number of service implementing entities requiring cooperation increases or decreases. The object is to provide a virtual terminal connection type distributed service system that can be performed accurately.
[0010]
[Means for Solving the Problems]
To achieve the above object, the present invention according to claim 1 is a distributed service system in which a plurality of nodes equipped with an information processing apparatus for realizing a service can communicate with each other, A single node provided with a first service realization means having a program function as a service realization entity on the processing device and a communication function with other nodes, and a plurality of second service realization means comprising the program function; In addition, when the second service realizing means communicates with the single node, the second service realizing means includes a composite node including a plurality of virtual terminal means that are responsible for a communication function for each of the single nodes.
[0011]
[Action]
According to the first aspect of the present invention, when the second service realization means constituted by the program function in the composite node communicates with the single node, the virtual terminal means provided for each of the single nodes By communicating with the single node via the communication function, the second service realization means of the composite node realizes a service request in cooperation with the first service realization means of the single node.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a virtual terminal connection type distributed service system according to an embodiment of the present invention. The virtual terminal connection type distributed service system shown in FIG. 1 includes a node X and a node Y realized by an information processing apparatus such as a workstation or a personal computer. The node X includes a service realization entity A (11) and a service. An implementation entity B (12) is provided, and a node Y is provided with a service implementation entity α (13). Further, a virtual terminal 1 (21) is provided in the node X corresponding to the service realization entity α (13) of the node Y.
[0013]
Next, the operation of the virtual terminal connection type distributed service system shown in FIG. 1 will be described by taking as an example the case where the service implementation entity A (11) needs to cooperate with the service implementation entity α (13).
When the service implementation entity A (11) needs to connect to the service implementation entity α (13), the service implementation entity A (11) selects the virtual terminal 1 (21) corresponding to the service implementation entity α (13). The virtual terminal 1 (21) that has received the connection request from the service realization entity A (11), instead of the terminal of the service realization entity α (13), requests the service implementation entity α (13) to perform service processing. The virtual terminal 1 (21) notifies the service implementation entity A (11) of the result processed by the service implementation entity α (13).
When the service realization entity B (12) needs to connect to the service realization entity α (13), the connection is made through the virtual terminal 1 (21) as in the case of the service realization entity A (11). .
[0014]
Next, with reference to FIG. 2, a more specific configuration and operation of the virtual terminal connection type distributed service system shown in FIG. 1 will be described.
The service implementation entity A (11) of the node X includes a common procedure (41). The common procedure (41) includes “capture other node connection virtual terminal”, “connection request”, “service request”, “disconnect request”, “release other node compatible virtual terminal”, and the like. Among these, “capture other node connection virtual terminal” and “release other node compatible virtual terminal” are connected to another node via a communication path.
[0015]
Further, the virtual terminal 1 (21) of the node X is provided with “node Y connection processing”, “node Y service request processing request”, “node Y disconnection processing”, and the like. The “node Y service request processing request” is connected to the “service request”, and the “node Y disconnection process” is connected to the “disconnect request”.
The service implementation entity B (12) is configured in the same manner as the service implementation entity A (11).
Further, the service realization entity α (13) of the node Y is provided with “terminal connection processing”, “service request processing”, “terminal disconnection processing”, and the like.
[0016]
Next, the case where the service realization entity A (11) cooperates with the service realization entity α (13) when the request for the service existing in the node Y is generated from the entity requesting the service request will be described as an example. .
The service realization entity A (11) executes a common procedure (41) for making a service request to another node. This common procedure (41) performs communication with a virtual terminal in a predetermined format, and the format is unchanged even in different virtual terminals.
[0017]
First, the service realization entity A (11) captures the virtual terminal 1 (21) corresponding to the other node Y and generates a communication path. The virtual terminal 1 (21) includes a node Y connection process (31), a node Y service request process request (32), and a node Y disconnect process (33).
Next, the service realization entity A (11) makes a connection request to the virtual terminal 1 (21). In the virtual terminal 1 (21), it is converted into a format necessary for connection with the node Y in the node Y connection processing (31) and connected. After the connection is completed, the service realization entity A (11) makes a service request to the virtual terminal 1 (21). In the virtual terminal 1 (21), in the node Y service request processing request (32), a service request is converted into a format required by the service realization entity α (13), and the service realization entity α (13) existing in the node Y To ask. The virtual terminal 1 (21) notifies the service implementation entity A (11) of the result processed by the service implementation entity α (13). After the service request is completed, the service realization entity A (11) makes a disconnection request to the virtual terminal 1 (21). In the virtual terminal 1 (21), in the node Y disconnection process (33), it is converted into a format necessary for disconnection from the node Y and disconnected. After the disconnection is completed, the service realization entity A (11) releases the virtual terminal 1 (21) corresponding to the node Y and disappears the communication path.
When the service implementation entity B (12) needs to cooperate with the service implementation entity α (13), the connection is made through the virtual terminal 1 (21) as in the case of the service implementation entity A (11). Do.
[0018]
Next, a virtual terminal connection type distributed service system according to another embodiment of the present invention will be described with reference to FIG. The embodiment shown in the figure shows a case where the service realization body β (14) is increased in the node Z in the embodiment shown in FIG.
[0019]
In FIG. 3, the case where the service implementation entity A (11) needs to cooperate with the service implementation entity α (13) and the service implementation entity β (14) will be described.
First, the service implementation entity A (11) selects the virtual terminal 1 (21) corresponding to the service implementation entity α (13) when connection to the service implementation entity α (13) becomes necessary. The virtual terminal 1 (21) that has received the connection request from the service realization entity A (11) requests the service realization entity α (13) for service processing on behalf of the actual terminal of the service realization entity α (13). The virtual terminal 1 (21) notifies the service implementation entity A (11) of the result processed by the service implementation entity α (13).
[0020]
Further, when the service implementation entity A (11) needs to connect to the service implementation entity β (14), the service implementation entity A (11) selects the virtual terminal 2 (22) corresponding to the service implementation entity β (14). The virtual terminal 2 (22) receiving the connection request from the service realization entity A (11) requests the service realization entity β (14) for service processing on behalf of the actual terminal of the service realization entity β (14). The virtual terminal 2 (22) notifies the service implementation entity A (11) of the result processed by the service implementation entity β (14).
[0021]
When the service implementation entity B (12) needs to connect to the service implementation entity α (13) and the service implementation entity β (14), the virtual terminal 1 is the same as the service implementation entity A (11). (21) and the virtual terminal 2 (22) are connected.
[0022]
Even when the number of service implementation entities that require cooperation increases, the implementation is possible without having to touch the service implementation entity A (11).
Furthermore, the virtual terminal 1 (21) and the virtual terminal 2 (22) can be dynamically selected.
[0023]
Next, with reference to FIG. 4, the effect | action by the more concrete structure of the virtual terminal connection type | mold distributed service system shown in FIG. 3 is demonstrated. In FIG. 4, the virtual terminal 2 (22) is provided as the service implementation subject β (14) increases in the node Z in FIG. The virtual terminal 2 (22) includes a node Z connection process, a node Z service request process request, and a node Z disconnection process.
[0024]
First, the service implementation entity A (11) executes a common procedure (41) for making a service request to another node when connection to the service implementation entity α (13) becomes necessary.
[0025]
The service realization entity A (11) captures the virtual terminal 1 (21) corresponding to the node Y and generates a communication path. The service realization entity A (11) makes a connection request to the virtual terminal 1 (21). In the virtual terminal 1 (21), it is converted into a format necessary for connection with the node Y in the node Y connection processing (31) and connected. After the connection is completed, the service realization entity A (11) makes a service request to the virtual terminal 1 (21). In the virtual terminal 1 (21), in the node Y service request processing request (32), a service request is converted into a format required by the service realization entity α (13), and the service realization entity α (13) existing in the node Y To ask. The virtual terminal 1 (21) notifies the service implementation entity A (11) of the result processed by the service implementation entity α (13). After the service request is completed, the service realization entity A (11) makes a disconnection request to the virtual terminal 1 (21). In the virtual terminal 1 (21), in the node Y disconnection process (33), it is converted into a format necessary for disconnection from the node Y and disconnected. After the disconnection is completed, the service realization entity A (11) releases the virtual terminal 1 (21) corresponding to the node Y and disappears the communication path.
[0026]
Next, when the service realization entity A (11) needs to be connected to the service realization entity β (14), a common service request for other nodes is made as in the case of the service realization entity α (13). The procedure (41) is executed.
[0027]
The service realization entity A (11) captures the virtual terminal 2 (22) corresponding to the node Z and generates a communication path. The service realization entity A (11) makes a connection request to the virtual terminal 2 (22). In the virtual terminal 2 (22), in the node Z connection process, it is converted into a format necessary for connection with the node Z and connected. The service implementing entity A (11) makes a service request to the virtual terminal 2 (22) after the connection is completed. In the virtual terminal 2 (22), in the node Z service request processing request, the service request is converted into a format required by the service realization entity β (14), and the service realization entity β (14) existing in the node Z is transmitted. Ask. The virtual terminal 2 (22) notifies the service implementation entity A (11) of the result processed by the service implementation entity β (14). The service realization entity A (11) makes a disconnection request to the virtual terminal 2 (22) after the service request is completed. In the virtual terminal 2 (22), it is converted into a format necessary for disconnection with the node Z in the node Z disconnection processing and disconnected. After the disconnection is completed, the service realization entity A (11) releases the virtual terminal 2 (22) corresponding to the node Z and disappears the communication path.
[0028]
FIG. 5 is a diagram showing a configuration of a virtual terminal connection type distributed service system according to still another embodiment of the present invention, and FIG. 6 shows a more specific configuration of the virtual terminal connection type distributed service system shown in FIG. FIG. The embodiment shown in FIGS. 5 and 6 shows a case where the service realization entity α (13) of the node X is reduced, that is, deleted in the embodiment of FIG.
[0029]
In FIG. 6, a request for a service existing in the node X is generated from an entity requesting a service request, and the service implementation entity A (11) needs to cooperate with the service implementation entity α (13) that has existed in the past. Explain the case.
[0030]
When the service implementation entity A (11) needs to connect to the service implementation entity α (13), the service implementation entity A (11) executes a common procedure for making a service request to another node. That is, the service realization entity A (11) attempts to capture (select) the virtual terminal 1 (21) corresponding to the service realization entity α (13) and generate a communication path. However, since the virtual terminal 1 (21) has already been deleted, it cannot be captured and an abnormality is returned. The service implementation entity A (11) notifies the request source, that is, the entity requesting the service request, that the distributed service cannot be implemented because the virtual terminal 1 (21) cannot be captured.
[0031]
As described above, according to the present embodiment, even if the number of service realization entities that require cooperation is reduced, the service realization entity A (11) can be realized without changing.
[0032]
As described above, in a distributed service environment, service implementing entities exist in a distributed manner. A virtual terminal is prepared for each other service implementation entity that needs to be connected. When a service realization entity needs to connect to another service realization entity, a virtual terminal for the service realization entity is selected and connected. When connection with another service realization entity becomes necessary, the virtual terminal for the service realization entity is selected and connected.
Therefore, if a virtual terminal corresponding to the service implementing entity is prepared, the virtual terminal can be dynamically selected and connected when necessary.
[0033]
When the types of service implementing entities increase, virtual terminals corresponding to the increased service implementing entities are prepared. Further, when the number decreases, the virtual terminal corresponding to the decreased service realization entity is deleted.
Therefore, even if the number of service implementation entities that need to be connected increases or decreases, a service implementation entity can be affected by remodeling the service implementation entity simply by preparing or deleting virtual terminals. Can be connected without any problems.
[0034]
【The invention's effect】
As described above, according to the present invention, the number of service realization entities that need to be connected in a distributed service environment increases by separating or adding or deleting virtual terminals corresponding to the service realization entities from the service realization entities. Even when the number is reduced, the service implementing entity and the service implementing entity to be connected are not affected, and the service implementing entity can dynamically select virtual terminals and connect to a plurality of types of service implementing entities.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a virtual terminal connection type distributed service system according to an embodiment of the present invention;
FIG. 2 is a block diagram showing a more specific configuration of the virtual terminal connection type distributed service system shown in FIG. 1;
FIG. 3 is a block diagram showing a schematic configuration of a virtual terminal connection type distributed service system according to another embodiment of the present invention.
4 is a block diagram showing a more specific configuration of the virtual terminal connection type distributed service system shown in FIG. 3;
FIG. 5 is a block diagram showing a schematic configuration of a virtual terminal connection type distributed service system according to still another embodiment of the present invention.
6 is a block diagram showing a more specific configuration of the virtual terminal connection type distributed service system shown in FIG. 5. FIG.
FIG. 7 is a block diagram showing a schematic configuration of a conventional distributed service system.
8 is a block diagram showing a specific configuration of the distributed service system shown in FIG.
[Explanation of symbols]
11, 12, 13, 14 Service realization subject 21, 22 Virtual terminal

Claims (1)

A distributed service system in which a plurality of nodes equipped with an information processing apparatus for realizing a service can communicate with each other,
The plurality of nodes are:
A plurality of single nodes provided with a first service realization means having a program function as a service realization entity on the information processing apparatus and a communication function with other nodes;
A plurality of second service implementation means constituted from the program function, and a composite in which the second service implementation means including a virtual terminal unit in charge of communication functions against to the single node when communicating with said single node have a and the node,
The virtual terminal means is provided for each of the plurality of single nodes, and is added to the composite node when the single node is added to the distributed service system, and the single node is deleted from the distributed service system. When deleted from the composite node
Further, the virtual terminal means accepts communication requests from a plurality of the second service realizing means , a virtual terminal connection type distributed service system.

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