JP2008077475A - Server client system and communication state delivery server - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the time for unnecessary access processing to a server device which is not connectable due to maintenance. <P>SOLUTION: In the server client system including a plurality of server devices each of which has a communicating state of connected or non-connected state with a communication network, and at least one client terminal which accesses the server devices through the communication network, and the communicating state delivery server therefor, a detection signal is intermittently transmitted to each of the server devices, when an answer signal is received therefrom, the communicating state with the server device concerned is determined to be a connected state, and a communicating state list showing the communicating state determined for each of the plurality of server devices is delivered to each client terminal. Each client terminal stops, when the communicating state of the server device that is its own access object is the unconnected state in the delivered communicating state list, the access thereto. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a server client system including a plurality of server devices such as an application server and a plurality of client terminals accessing the server device, and to a communication state distribution server connected to the server client system.

  In a server client system, not only a form in which one client terminal connects to one server apparatus and receives a desired service provision, but also a form in which a complex service provision is obtained by simultaneously connecting to a plurality of server apparatuses. Yes. This is due to the situation in which a large number of server devices that deal with qualitative differences in service contents and an increase in the amount of services are distributed and arranged on the network along with the diversification of tasks required by client terminals. In such a situation, it is required for the client terminal that each of a plurality of necessary server devices is always operating and can be connected, and that the connection destination server promptly responds to the connection request.

In the communication connection control method disclosed in Patent Document 1, the upper module corresponding to the client terminal stores the average connection success time of the connection partner corresponding to the server device, and the average connection success time at the time of connection If there is no response from the connection partner even after the above time has elapsed, the connection process is interrupted. As a result, the time required for the connection process can be shortened.
JP-A-11-032084

  However, in the conventional technology, since connection processing is executed even for a server device that has not been connected to the network due to a network failure or server maintenance beforehand, a response from the unconnected server device is not received. The above connection success time is awaited at most, and there is a problem that it takes time to complete the connection processing with all the server devices.

  An object of the present invention is to provide a server client system and a communication state distribution server that can reduce the time required for useless access processing to a server device that cannot be connected due to reasons such as maintenance.

  A server client system according to the present invention includes a plurality of server devices each having a communication state that is connected to or not connected to a communication network, and at least one client terminal that accesses the server device via the communication network. A server client system that intermittently sends a detection signal to the server device for each of the plurality of server devices, and receives a response signal to the detection signal, the communication state of the server device is in a connected state. Communication state determining means for determining that there is a communication state list distribution means for distributing a communication state list representing the communication state determined for each of the plurality of server devices to each of the client terminals, Each of the communication statuses of the server device to be accessed is the communication status that has been distributed. When represented unconnected state in the strike, characterized in that it stops the access.

  A communication state distribution server according to the present invention includes a plurality of server devices each having a communication state that is connected or not connected to a communication network, and at least one client terminal that accesses the server device via the communication network. A communication status distribution server connected via the communication network, and for each of the plurality of server devices, a detection signal is intermittently sent to the server device and a response signal to the detection signal is received. A communication state determination unit that determines that the communication state of the server device is a connection state, and a communication state list that distributes a communication state list indicating the communication state determined for each of the plurality of server devices to each of the client terminals. Each of the client terminals includes a communication state of a server device to be accessed, When represented as unconnected in Shin communication state list, which means ceases the access.

  According to the server client system and the communication status distribution server according to the present invention, a configuration is provided in which a server device that cannot be connected due to maintenance or the like is detected prior to access. As a result, the time required for useless access processing can be reduced.

  Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a first embodiment of the present invention, and shows the overall configuration of a server client system including a server client system and a communication state distribution server according to the present invention. Here, a plurality of application servers 11 to 1n (n is a positive number), a plurality of client terminals 21 to 2m (m is a positive number), and a communication state distribution server 50 is a LAN (Local Area Network). 30, the server client system 40 is configured. Each of the plurality of application servers 11 to 1n is a server device that provides an application service, and the content of the application service can be a variety of business services such as an accounting processing business and a scientific and technical calculation business. Each of the plurality of application servers 11 to 1n is in a normal operating state, but may be in a non-operating state due to factors such as a network failure or maintenance. The operating application server is in a connection state with the LAN 30 which is a communication network. The non-operating application server is not connected to the LAN 30.

  Each of the plurality of client terminals 21 to 2m is connected to one or more of the plurality of application servers 11 to 1n according to the business purpose, and receives application service from them. Each of the plurality of client terminals 21 to 2m includes different software (not shown) according to the business purpose, but has the same function as a function of connecting to the application servers 11 to 1n. An access processing unit 211 and a communication state confirmation unit 212 are included.

  The application server access processing unit 211 has a function of accessing the necessary application servers 11 to 1n according to a request from the business function of the client terminal. The communication status confirmation unit 212 has a function of confirming the communication status of the application servers 11 to 1n to be accessed in response to a request from the application server access processing unit 211. The confirmation of the communication state is made based on the server communication state list 53 to be distributed by requesting the communication state distribution server 50 to distribute the server communication state list 53.

  The communication status distribution server 50 is a server that distributes information representing the communication status of the application servers 11 to 1n to each of the plurality of client terminals 21 to 2m via the LAN 30. The communication state distribution server 50 includes a communication state determination unit 51, a communication processing unit 52, a server communication state list 53, and a communication state distribution unit 54.

  The communication state determination unit 51 periodically determines the communication state of the application servers 11 to 1n using the communication processing unit 52, and sets the determination result in the server communication state list 53. The communication state is determined intermittently. In the present embodiment, it is intermittently performed according to a state update cycle Ta which is a fixed cycle set in the server communication state list 53.

  For example, the communication processing unit 52 performs a communication process of sending a ping command, for example, as a detection signal to each of the application servers 11 to 1n and receiving response signals from the application servers 11 to 1n with respect to the command. Do. The application server that transmits the response signal is logically connected to the LAN 30 that is the communication network, and the communication state is determined to be in the connected state. The application server that does not transmit the response signal is not logically connected to the LAN 30 that is the communication network, and it is determined that the communication state is in an unconnected state.

  The contents of the server communication state list 53 are distributed by the communication state distribution unit 54 to the client terminals 21 to 2m. The communication state distribution unit 54 can be realized by, for example, server software using an HTTP protocol for a normal Web server.

  The management terminal 60 may be connected to the LAN 30 and included in the server client system 40. The management terminal 60 is a terminal that is operated by an administrator, includes dedicated software (not shown) for managing the entire server client system 40, and communicates with the application server access processing unit 211 in the same manner as the client terminals 21 to 2m. A state confirmation unit 212. In this respect, the management terminal 60 constitutes a kind of client terminal in relation to the application servers 11 to 1n.

  FIG. 2 shows a setting example of the server communication state list 53. The setting example will be described with reference to the components shown in FIG.

  The server communication status list 53 is registered for the number of application servers arranged in the server client system. For each of the application servers 11 to 1n, the server name (531), the communication status (532), and the status update are registered. This is a database in which the period Ta (533) and the average connection success time Ts (534) are associated and set.

  In the server name (531), the host names or IP (Internet Protocol) addresses of the application servers 11 to 1n are set. In the communication state (532), “connected” is set when connected to a LAN that is a communication network, and “not connected” is set when not connected to a LAN. In the state update cycle Ta (533), a cycle in which the communication state determination unit 51 periodically updates the server communication state list 53 using the communication processing unit 52 is set. The average connection success time Ts (534) is set to the time when each of the client terminals 21 to 2m tries to connect to the application server, a response is obtained to the connection request and the connection is expected to be successful. Is done. The calculation of the time is obtained by performing connection attempts a plurality of times toward each of all the client terminals 21 to 2m and averaging the obtained connection times.

  FIG. 3 shows a processing procedure in which the communication status distribution server 50 updates the communication status of each application server. Such a processing procedure is normally started immediately after the communication status distribution server 50 is activated, and is continuously executed unless an end command is issued by the operator.

  First, the communication status distribution server 50 refers to the server communication status list (step S101). Next, the communication state distribution server 50 waits for each state update period Ta (step S102).

  Next, the communication state distribution server 50 determines whether there is an application server for which the state update cycle Ta has elapsed (step S103). If there is an application server that has passed the state update cycle Ta, the communication state distribution server 50 attempts communication processing for sending a detection signal to the application server (step S104). Next, it is determined whether or not there is a response signal from the application server (step S105).

  Here, if there is a response signal from the application server, the communication state distribution server 50 determines that the communication state of the application server is in the connected state in the server communication state list and sets it to “connected” (step S106). ). On the other hand, if there is no response signal from the application server, the communication status distribution server 50 determines in the server communication status list that the communication status of the application server is in an unconnected state and sets it to “not connected” (step S107). ).

  FIG. 4 shows a processing procedure for the client terminal to connect to the application server with reference to the server communication state list. Here, as an example, it is assumed that the client terminal 21 accesses the application server 11.

  It is assumed that the operator performs an access request operation directed to the application server 11 with respect to the client terminal 21 (step S201). In response to the access request, the client terminal 21 requests the communication status distribution server 50 to distribute the server communication status list prior to actual access to the application server 11. In response to this, the communication state distribution server 50 distributes the server communication state list to the client terminal 21 (step S202).

  The client terminal 21 recognizes the latest communication state of the application server 11 from the server communication state list (step S203). Next, the client terminal 21 determines whether the communication state of the application server 11 is a connected state or an unconnected state (step S204). If the communication state is an unconnected state, the client terminal 21 does not actually access the application server 11 but displays, for example, “the application server 11 is in an unconnected state” and stops processing for the access request. (Step S205).

  On the other hand, if the communication state is the connection state, the client terminal 21 recognizes the average connection success time Ts of the application server 11 with reference to the server communication state list (step S206). Next, the client terminal 21 actually requests access to the application server 11 (step S207) and waits for a response. Next, the client terminal 21 determines the passage of the average connection success time Ts acquired in step S206 (step S208). If the average connection success time Ts has elapsed, the client terminal 21 stops access to the application server 11 and displays, for example, that the application server 11 is inaccessible and performs processing for the access request. Cancel (step S205).

  On the other hand, when there is a response from the application server 11 without the average connection success time Ts elapses (step S209), the client terminal 21 continues processing according to the response (step S210). The application server 11 provides an application service to the client terminal 21 (step S211).

  In the above embodiment, by applying the server client system and the communication state distribution server according to the present invention, the communication state distribution server 50 performs communication processing that periodically operates at the state update period Ta set for each application server. The communication state of the application server to the communication network can be reflected in the server communication state list 53 in real time. By receiving the distribution of the reflected server communication state list 53, each of the client terminals 21 to 2m detects an application server that is not connected to a communication network such as the LAN 30 in advance, thereby omitting unnecessary access. In addition, the time required for connection processing with a plurality of application servers can be shortened.

  In the above description, the state update cycle Ta is set for each application server. However, even if one state update cycle Ta is set and the state update cycle Ta is used in common for a plurality of application servers. good.

It is a block diagram which shows the Example of this invention and shows the whole structure containing the server client system by this invention. It is a figure which shows the example of a setting of the server communication state list | wrist shown in FIG. It is a flowchart which shows the process sequence which a communication status delivery server performs. It is a sequence diagram which shows the process sequence in which a client terminal accesses an application server.

Explanation of symbols

11 to 1n Application server 21 to 2m Client terminal 30 LAN
DESCRIPTION OF SYMBOLS 40 Server client system 50 Communication state distribution server 51 Communication state determination part 52 Communication processing part 53 Server communication state list 54 Communication state distribution part 60 Management terminal 211 Application server access processing part 212 Communication state confirmation part 531 Server name 532 Communication state 533 State Update cycle Ta
534 Average connection success time Ts

Claims (4)

A server client system including a plurality of server devices each having a communication state that is connected or unconnected to a communication network, and at least one client terminal that accesses the server device via the communication network,
A communication state determination that, for each of the plurality of server devices, intermittently sends a detection signal to the server device and determines that the communication state of the server device is a connection state when a response signal to the detection signal is received. Means,
Communication state list distribution means for distributing a communication state list representing a communication state determined for each of the plurality of server devices to each of the client terminals,
Each of the client terminals suspends the access when the communication state of the server device to be accessed is represented as an unconnected state in the distributed communication state list. . The communication state list distribution means includes an expected connection success time determined for each of the plurality of server devices in the communication state list for distribution,
Each of the client terminals, when accessing the server device indicated as the connection state in the communication state list, stops the access when there is no response exceeding the expected connection success time. The server client system according to claim 1. Connected via the communication network to a plurality of server devices each having a communication state that is connected to or not connected to a communication network and at least one client terminal accessing the server device via the communication network A communication status distribution server,
A communication state determination that, for each of the plurality of server devices, intermittently sends a detection signal to the server device and determines that the communication state of the server device is a connection state when a response signal to the detection signal is received. Means,
Communication state list distribution means for distributing a communication state list representing a communication state determined for each of the plurality of server devices to each of the client terminals,
Each of the client terminals suspends the access when the communication state of the server device to be accessed is represented as an unconnected state in the distributed communication state list. server. The communication state list distribution means includes an expected connection success time determined for each of the plurality of server devices in the communication state list for distribution,
If each of the client terminals accesses a server device that is represented as a connection state in the communication state list and does not receive a response exceeding a preset expected connection success time, the client terminal stops the access. The communication state distribution server according to claim 3.