JPH1040193A - Client/multiplexing server system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently attain communication between a client and each server without increasing the total traffic amounts of a network, the overhead of a protocol processing, and the turn around time of the processing by converting different transmitted message through number into the same transmitted message through number based on a communicated message from the client. SOLUTION: A communicated message transmitted from a client 1 is distributed to the destination of each server 31, 32, and 33 by a communicated message distributing means 4. The communicated message distributed like this to which a destination address is set is transmitted through a communication managing means 6 and a communication message converting means 7 so that the content of a prescribed area in the communication message can be held and converted. Moreover, the same received message confirmation number in the communicated message is converted into each different received message number corresponding to each server 31, 32, and 33 based on each transmitted message through number held corresponding to each server 31, 32, and 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delivery confirmation type in which a transmission message serial number and a reception message confirmation number are set in a communication message between a client and a plurality of servers connected via a network, and are mutually received. The present invention relates to a client / multiplex server system in which a process requested by a client is executed by a plurality of servers to improve reliability while performing communication using the one-to-one communication protocol.

[0002]

2. Description of the Related Art A delivery acknowledgment type in which a transmission message serial number and a reception message confirmation number are set in a communication message between communication nodes such as a client and a server and mutually received.
When communication is performed using the one-to-one communication protocol, since the initial value of the transmission message serial number generally held by each node is different, it is necessary to control the transmission message serial number and the received message confirmation number independently for each two nodes that communicate. is there.

Accordingly, the conventional client / multiplex server system employs the following three methods when a process requested by a client is executed by a plurality of servers in order to improve reliability.

In the first conventional method, a client communicates with each server that executes processing using an arbitrary communication protocol. The client has a communication message distribution unit and a communication message selection unit. I have.

FIG. 9 is a diagram showing an example of the configuration of a client / multiplex server system 91 for implementing the first conventional method and an example of the flow of communication messages between the client and each server. In the figure, client 1
1 executes a requested process while communicating with each of the servers 31, 32, and 33 via the built-in communication message distribution means 41 and communication message selection means 51 and further via the network 21. In FIG. 9, a thick solid line indicates a flow of a processing request message from the client to each server, and a dotted line indicates a flow of a result response message from each server to the client.

In the second conventional method, a communication protocol is once set between a client and a communication message distribution unit and a communication message selection unit, and between a communication message distribution unit and a communication message selection unit and a server. Terminate and use any communication protocol.

FIG. 10 is a diagram showing an example of the configuration of a client / multiplex server system 92 for implementing the second conventional method and an example of the flow of communication messages between the client and each server. In the figure, a client 12 communicates with a communication message distribution means 42 and a communication message selection means 52 via a subnetwork 221, and the communication message distribution means 42 and the communication message selection means 52 communicate with the servers 31 and 32 via a subnetwork 222. , 33 while performing request processing. In FIG. 10, a thick solid line indicates a flow of a processing request message from the client to each server, and a dotted line indicates a flow of a result response message from each server to the client.

Further, the third conventional method uses a non-delivery acknowledgment type communication protocol, and the distribution of communication messages is a simple copy except for a destination server address area and an error control code area.

FIG. 11 is a diagram showing an example of the configuration of a client / multiplex server system 93 for implementing the third method and the flow of communication messages between the client and each server. FIG. 12 is a diagram showing an example of a communication message 80 used in the client / multiplex server system shown in FIG. 11. The communication message 80 has a destination address area 81 for setting a destination address, and a source address. And a data area 85 for setting data. In FIG. 11,
A thick solid line indicates a flow of a processing request message from the client to each server, and a dotted line indicates a flow of a result response message from each server to the client.

[0010] In FIG. 11, a client 13 communicates with a server 31 via a network 23 holding communication message distribution means 43 and communication message selection means 53.
Request processing is executed while communicating with each of 32 and 33.

[0011]

In the first conventional method described above, if the server multiplicity is n, the number of communication messages between the client and each server becomes n times, so that the total traffic volume of the network is reduced. However, there is a problem that the client needs to be aware of multiprocessing.

Further, in the second conventional method, since the communication protocol is temporarily terminated in the communication message distribution means and the communication message selection means, the overhead of the communication protocol processing increases and the turnaround time of the processing increases. There's a problem.

Further, in the third conventional method, since the reliability of communication between a client and each server is reduced by using a communication protocol without delivery confirmation, the lower the network quality, the more the application depends. The frequency of resending communication messages and re-executing server processing increases,
There is a problem that the turnaround time of the process is increased and the applicable service is limited because the communication protocol to be used is limited.

The present invention has been made in view of the above,
Its purpose is to increase the total traffic volume of the network, the overhead of the communication protocol processing, the turnaround time of the processing, and increase the delivery confirmation type one-to-one communication without considering the multiplexing server from the client. It is an object of the present invention to provide a client / multiplex server system capable of efficiently performing communication between a client and each server using a protocol.

[0015]

In order to achieve the above object, the present invention according to claim 1 has a client and a plurality of servers connected to a network, and performs processing from the client through a plurality of servers via the network. A transmission acknowledgment type in which a communication between a client and each server, which transmits data to a server and executes the processing in the plurality of servers, sets a transmission message serial number and a reception message acknowledgment number in each communication message and mutually exchanges them. A client / multiplex server system using the one-to-one communication protocol of claim 1, wherein a communication message distributing means for distributing and transmitting a communication message from the client to each server to a plurality of servers; Select one communication message from multiple communication messages to the client, and Communication message selecting means for transmitting, and converting different transmission message serial numbers of the communication messages from the plurality of servers to the client into the same transmission message serial number based on the communication message from the client; The gist of the present invention is to have conversion means for converting the same received message confirmation number of a communication message into a different received message confirmation number for each server based on the communication message from each server.

According to the first aspect of the present invention, each communication message from the client via the communication message distribution means addressed to each server has the same received message confirmation number in the communication message corresponding to each server by the conversion means. Then, each received message is converted to a different received message confirmation number and transmitted to each server. In a communication message addressed to the client from each server, each different transmitted message sequence number in the communication message is converted into the same transmitted message sequence number by the conversion means. Sent to the client.

According to a second aspect of the present invention, there is provided a client and a plurality of servers connected to a network, wherein processing from the client is transmitted to the plurality of servers via the network, and the plurality of servers transmit the processing to the plurality of servers. A communication between the client and each server that executes processing is performed by setting a transmission message serial number and a reception message confirmation number in each communication message, and mutually exchanging them.
What is claimed is: 1. A client / multiplexing server system using a communication protocol, comprising: a communication message distributing means for distributing a communication message from the client to each server to a plurality of servers; Communication message selecting means for selecting one of the communication messages from the communication messages and transmitting the communication message to the client, and a reception message confirmation number of the communication message transmitted from the client to each server via the communication message distribution means. Communication management means for holding the transmission message serial number of each communication message transmitted from each server to the client corresponding to each server, and transmitting the communication message serial number from the client to each server via the communication message distribution means. Each communication message The communication management means converts the same received message confirmation number into a different received message confirmation number corresponding to each server based on the respective transmitted message serial numbers held corresponding to each server in the communication management means. The different transmission message serial numbers respectively corresponding to the respective servers of the communication messages transmitted to the same address are assigned to the same transmission message serial number based on the received message confirmation number held in the communication management means and the different transmission message serial numbers. A gist of the present invention is to have a communication message converting means for converting.

According to the second aspect of the present invention, a received message confirmation number of a communication message transmitted from the client to each server via the communication message distribution means, and a communication transmitted from each server to the client. Each transmission message serial number of the message is held in the communication management means corresponding to each server, and each communication message transmitted from the client to each server via the communication message distribution means is the same received message confirmation number in the communication message. Is converted to a different received message confirmation number corresponding to each server based on each outgoing message serial number held in the communication management means, transmitted to each server, and transmitted from each server to the client. The message is transmitted in each of the different Message sequence number is sent to the client are converted to the same transmission message sequence number based on the received message confirmation number held in the communication management means.

Further, the present invention according to claim 3 provides the invention according to claim 1.
In the invention according to the second aspect, a plurality of the communication management means and the plurality of communication message conversion means are provided between the communication message distribution means and the communication message selection means and each server in a distributed manner corresponding to each server. That is the gist.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the received message confirmation number held by the communication managing means is the same as the received message confirmation number before being converted by the communication message converting means. The received message confirmation number after the conversion, and the communication message converting means converts the same received message confirmation number to a different received message confirmation number corresponding to each server. A message data length is added to each of the outgoing message serial numbers held correspondingly to generate different received message confirmation numbers corresponding to the respective servers, and the communication message converting means corresponds to the respective servers. A process for converting each different outgoing message serial number to the same outgoing message serial number But the gist that the the pre-conversion of the received message confirmation number said transmitting messages to the sequence number by adding the difference obtained by subtracting the received message confirmation number after the conversion to generate the same transmission message sequence number.

[0021]

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

FIG. 1 is a diagram showing a configuration of a client / multiplex server system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a communication message used in the client / multiplex server system shown in FIG.
FIG. 3 is a diagram showing a flow of a communication message between a client and each server in the client / multiplex server system shown in FIG. In FIG. 3, a thick solid line indicates a flow of a processing request message from the client to each server, and a dotted line indicates a flow of a result response message from each server to the client 1.

In the client / multiplex server system 10 shown in FIG. 1, clients 1,..., Servers 31, 32, 33,. While the server 33 communicates with each other, the servers 31, 32, and 33 execute the processing requested by the client 1 and return the processing result.

The client 1 and each of the servers 31, 32, 3
As shown in FIG. 2, the communication message 8 communicates with a destination address area 81 in which a destination address is set, a source address area 82 in which a source address is set, and a data area 85 in which data is set. One-to-one delivery confirmation type
It has a transmission message serial number area 83 in which a transmission message serial number used when using a communication protocol is set, and a reception message confirmation number area 84 in which a reception message confirmation number is set.

The client / multiplex server system 10 of the present embodiment shown in FIGS.
Using the communication protocol, the client 1 and each server 3
1, 32, and 33, and a communication message 8 mutually transmitted between the client 1 and each of the servers 31, 32, and 33 includes a transmission message serial number area 8.
3, a transmission message serial number is set, and a reception message confirmation number is set in a reception message confirmation number area 84.

Further, the client / multiplex server system 10 of the present embodiment transmits a communication message from the client 1 to a plurality of servers 31, 32,
The communication message distribution means 4 for distributing the communication message for transmission to the client 33, selects one communication message from a plurality of communication messages addressed to the client 1 from the servers 31, 32 and 33, and transmits the communication message to the client 1. The communication message selection means 5 holds the received message confirmation numbers of the communication messages transmitted from the client to the servers 31, 32, 33 via the communication message distribution means 4, respectively.
3 indicates the transmission message serial numbers of the communication messages transmitted to the client 1 respectively.
33, and the communication management unit 6 stores the same received message confirmation number of each communication message transmitted from the client 1 to each of the servers 31, 32, 33 via the communication message distribution unit 4. In the above, based on each transmission message serial number held corresponding to each server, each received message confirmation number is converted into a different received message confirmation number corresponding to each server 31, 32, 33. The transmission message serial numbers which are respectively different corresponding to the respective servers of the communication messages transmitted to the server are converted into the same transmission message serial number based on the received message confirmation number held in the communication management means 6 and the different transmission message serial numbers. The communication message converting means 7 is provided.

In the client / multiplex server system 10 configured as described above, a communication message transmitted from the client 1 and addressed to each of the servers 31, 32, 33 is transmitted by the communication message distribution means 4 to each of the servers 31, 3, 3.
Distributed to 2,33. At this time, each server 31, 3
Addresses corresponding to the respective servers 31, 32, and 33 are set in a destination address area 81 in the communication message addressed to the servers 2, 33. The communication message thus distributed and set with the destination address passes through the communication management means 6 and the communication message conversion means 7, whereby the contents of a predetermined area in the communication message are held and converted. Specifically, the received message confirmation number area 84 of the communication message
Is received in the communication management means 6, and the same received message confirmation number in the communication message is further stored in the communication management means 6 based on each transmission message serial number held corresponding to each server. The communication message converting means 7 converts the received message confirmation number into a different received message confirmation number corresponding to each of the servers 31, 32, and 33, and then transmits the same to each of the servers 31, 32, and 33.

The communication message addressed to the client 1 transmitted from each of the servers 31, 32, 33 passes through the communication management means 6 and the communication message conversion means 7, thereby retaining the contents of a predetermined area in the communication message. And the conversion is performed. Specifically, the transmission message serial numbers of the communication messages are held in the communication management means 6 corresponding to the respective servers 31, 32, 33, and further, the respective servers 31, 32 of the communication messages are further stored. , 33, the transmission message serial numbers different from each other are converted by the communication message conversion means 7 into the same transmission message serial numbers based on the received message confirmation numbers held in the communication management means 6 and the different transmission message serial numbers, respectively. The message is transmitted to the communication message selecting means 5. Communication message selection means 5
Receives a communication message from each of the servers 31, 32, and 33, selects one communication message according to a predetermined algorithm such as a first-come-first-served order or a majority decision of the message content, and transmits the communication message to the client 1.

FIG. 4 is a diagram showing a configuration of a client / multiplex server system according to another embodiment of the present invention. In the client / multiplex server system 100 shown in the present embodiment, the communication message distribution means 4 and the communication message selection means 5 are provided intensively in the network 2 as in the embodiment of FIG. On the other hand, a plurality of communication management means and communication message conversion means are provided in a distributed manner corresponding to the respective servers 31, 32, 33. That is, the client /
In the multiplex server system 100, the communication management means 61 and the communication message conversion means 71 correspond to the server 31.
Is provided, and a communication management means 62 and a communication message conversion means 72 are provided corresponding to the server 32.
3, a communication management means 63 and a communication message conversion means 73 are provided independently of each other. In FIG. 3, a thick solid line indicates a flow of a processing request message from the client to each server, and a dotted line indicates a flow of a result response message from each server to the client 1.

As described above, the communication management means 61, 62,
The functions of the communication message converting means 63 and the communication message converting means 71, 72 and 73 are the same as those performed by the communication managing means 6 and the communication message converting means 7 shown in FIG. Its basic functions are communication management means 6 and communication message conversion means 7
It has the same function as

That is, the communication management means 6i (6i = 6
1, 62, 63) from the client 1 to the server 3i.
(3i = 31, 32, 33) holds the reception message confirmation number of the communication message transmitted to the client 3 (3i = 31, 32, 33).
Holds the transmission message serial number of the communication message transmitted to the address. Also, the communication message conversion means 7i (7i =
71, 72, 73) are from the client 1 to the server 3i.
(3i = 31, 32, 33) of the communication message transmitted to the communication management means 6i.
(6i = 61, 62, 63) is converted to a received message confirmation number based on the transmission message serial number held in the communication message transmitted from the server 3i (3i = 31, 32, 33) to the client 1. The transmission message serial number is stored in the communication management unit 6i (6i = 61, 62, 6).
Based on the received message confirmation number and the transmitted message serial number stored in 3), the message is converted into a transmitted message serial number.

FIG. 5 shows a TCP / I of a delivery confirmation type in the client / multiplex server system 100 shown in FIG.
FIG. 3 is a diagram illustrating an example of a communication sequence viewed from a client 1 performing communication using a P protocol.

In the client / multiplex server system 100 of the present embodiment, a processing request from the client 1 is executed by three servers 31, 32, and 33. It seems that only the server can communicate with the server and execute the request processing. FIG. 5 shows the client 1
From the representative server and the communication from the representative server to the client 1 are performed three times, respectively.
Communication 11, 12, 2 for each communication in time order
Numbers 1, 2, 31, and 32 are assigned, and each communication 1
Combinations 1 and 12, communications 21 and 22, and communications 31 and 32, respectively, constitute communications 1, communications 2, and communications 3. FIG. 5 additionally shows changes in the client 1, the communication message, the transmission message serial number and the received message confirmation number for each communication in the representative server. That is, in FIG. 5, two numerical values arranged side by side indicate a transmission message serial number and a reception message confirmation number. For example, in the numerical values 101 and 300 shown in the communication 21 from the client 1, 101 indicates the transmission message serial number and 300 indicates the received message confirmation number. In FIG. 5, the message data length is 1
00 bytes are set.

The communication sequence shown in FIG. 5 will be described. Initially, when the communication 11 from the client 1 of the communication 1 to the representative server is performed, the initial value "1" is set to the client 1 as the transmission message serial number, and the received message is confirmed. The number is “undecided”, the initial value “200” is set as the transmission message serial number in the representative server, and the received message confirmation number is set to “undecided”. In this initial state, the client 1 sets “1, 0” as the transmission message serial number and the reception message confirmation number, respectively.
(Undecided) "is transmitted to the representative server.

When the representative server receives the communication message of the communication 11 from the client 1, the representative server adds a message data length of 100 bytes to the transmission message serial number "1" received from the client 1 as a reception message confirmation number, and confirms the reception message. Communication number 101 is generated as a number, and communication 1 set to “200, 101” as a transmission message serial number and a reception message confirmation number, respectively.
2 is transmitted to the client 1.

When the client 1 receives the communication message of the communication 12 from the representative server, the client 1 adds the message data length 100 to the transmission message serial number “200” received from the representative server as a received message confirmation number,
"300" is generated as the received message confirmation number, and the communication message of the communication 21 in which "101, 300" is set as the transmission message serial number and the received message confirmation number is transmitted to the representative server.

In the same manner, in the communication 22 from the representative server to the client 1, a communication message whose transmission message serial number and reception message confirmation number are set to "300, 201" is transmitted, and in the communication 31, the transmission message serial number and reception "20" as the message confirmation number
A communication message set to "1,400" is transmitted,
In the communication 32, a communication message set to “400, 301” as a transmission message serial number and a reception message confirmation number is transmitted.

In the processing of FIG. 5, the communication between the client 1 and the representative server has been described. In this representative server, the case where the initial value of the transmission message serial number is set to "200" has been described. In the communication, the initial values of the transmission message serial numbers of the servers 31, 32, and 33 are set to different values. For example,
The initial values of the transmission message serial numbers of the servers 31, 32, and 33 are set to different values, such as 100, 200, and 300, respectively. This is the biggest reason why the same processing cannot be efficiently executed by a plurality of servers using the delivery confirmation type one-to-one communication protocol in the conventional client / multiplex server system.

The client / multiplex server system of the present embodiment can communicate efficiently even when the initial values of the transmission message serial numbers of the respective servers are different.

Next, in the client / multiplex server system 100 shown in FIG. 4, the processing when the initial value of the transmission message serial number of the communication message is different for each of the servers 31, 32, 33 will be described with reference to FIGS. It will be described with reference to FIG.

FIG. 6 shows a case where the client / multiplex server system 100 shown in FIG. 4 performs communication between the client 1 and each of the servers 31, 32, 33 in the communication sequence shown in FIG. Server 31,
32 is a diagram showing initial values and temporal transitions of transmission message serial numbers and received message confirmation numbers held by communication management means 61, 62, and 63, respectively. FIG.
Is a diagram showing the destination address, source address, transmission message serial number, and reception message confirmation number of the communication message at each point in the client / multiplex server system shown in FIG. 4 for each communication 1, 2, and 3. is there.
FIG. 8 shows the transmission message serial number and the reception message confirmation number of each communication message in the communication between the client 1 shown in FIGS. 6 and 7 and each of the servers 31, 32, 33 for each communication and each point. FIG.

In this process, the addresses of the client 1, the servers 31, 32, and 33 and the representative server are set to a1, a31, a32, a33, and a3, respectively.
The initial values of the transmission message serial numbers for each of 32 and 33 are 1,100, 200 and 300, respectively, and the message data length is 100 bytes. Further, in this processing, the destination address and the source address in the communication message 8 are changed in the communication message distribution unit 4 and the communication message selection unit 5.

In this processing, each communication management means 61, 6
Reference numerals 2 and 63 hold a transmission message serial number and a reception message confirmation number in the communication message 8 based on the following algorithm.

(1-1) From the client 1 to each server 3
In the communication messages addressed to 1, 32, and 33, the received message confirmation numbers before conversion by the communication message conversion means 71, 72, and 73 are held as held reception message confirmation numbers (before update), and the communication message conversion means 7
The received message confirmation number converted at 1, 72, and 73 is retained as a retained received message confirmation number (after update). That is, it is expressed as follows.

(Held received message confirmation number (before update)) = (received message confirmation number before conversion) (held held message confirmation number (after update)) = (converted received message confirmation number) (1-2) In a communication message addressed to the client 1 from each of the servers 31, 32, and 33, a value obtained by adding a message data length to a transmission message serial number is held as a held transmission message serial number. That is, it is expressed as follows.

[0046]

## EQU1 ## (held transmission message serial number) = (transmission message serial number + message data length) Further, in this processing, each communication message converting means 7
1, 72 and 73 change the transmission message serial number and the reception message confirmation number in the communication message 8 based on the following algorithm.

(2-1) From the client 1 to each server 3
For communication messages addressed to 1, 32, and 33, the held transmission message serial numbers held by the communication management means 61, 62, and 63 are converted into received message confirmation numbers. That is,
It is expressed as follows.

[0048]

(Received message confirmation number) = (Sequence number of held transmission message) (2-2) In a communication message from each of the servers 31, 32, 33 to the client 1, the communication management means 61,
The transmission message serial number and the communication management means 61, 6 are added to the held reception message confirmation number (before updating) held in 62, 63
The value obtained by adding the difference between the received and received message confirmation number (after updating) held in steps 2 and 63 is converted into a transmission message serial number. That is, it is expressed as follows.

[0049]

(Sending message serial number) = (Hold received message confirmation number (before update)) + (Sending message serial number) −
(Hold received message confirmation number (after update)) In FIG. 6, the part enclosed by a dotted line is a communication management unit 61 based on the above algorithms (1-1) and (1-2).
A transmission message serial number and a reception message confirmation number held by 62 and 63 are shown. In FIG. 7, a portion surrounded by a dotted line is the algorithm (2-
Communication message conversion means 7 based on 1) and (2-2)
1, the transmission message serial number and the reception message confirmation number in the communication message 8 converted by 1, 72 and 73 are shown.

In FIG. 7, the communication message selecting means 5 selects a communication message whose value is "200" from among three communication messages having transmission message serial numbers different from 100, 200 and 300 in the first communication 1. The selected communication message has no effect on the subsequent communication. This means that at the time of the first communication between the client 1 and the server, each communication management means 6
This occurs because the held received message confirmation numbers of 1, 62 and 63 are the same (initial value).

Next, the contents of FIGS. 6 and 7 will be described with reference to FIG.

First, when the client 1 sends out a communication message in which the transmission message serial number and the reception message confirmation number are respectively set to “1, 0” in the communication 11, the communication message is distributed by the communication message distribution means 4 to each server 31, The communication messages are distributed to three communication messages for the communication management means 32 and 33, respectively.
2, 63 and communication message conversion means 71, 72, 7
3 to each of the servers 31, 32 and 33. In this case, the communication management means 61, 62, and 63 respectively hold "0" as the held received message confirmation number (before updating) and the held received message confirmation number (after updating).

When each of the servers 31, 32, 33 receives the communication 11 from the client 1, it has "100, 200, 300" as the initial value of the transmission message serial number. A communication message in which “100, 200, 300” is set as the transmission message serial number of each communication message for communication 12 from 33, and “101” is set as the reception message confirmation number, and is sent to the client 1 Send. That is, the server 31 transmits a communication message in which “100, 101” is set as the transmission message serial number and the reception message confirmation number, and the server 32 transmits “2, 1”.
00, 101 ”is transmitted,
The server 33 transmits a communication message in which “300, 101” is set. Note that the received message confirmation number “101” in this case is a value obtained by adding 100 bytes of the message data length to the transmission message serial number “1” received from the client 1.

Each communication message from each of the servers 31, 32, 33 is transmitted to the communication management means 61, 62, 63 and the communication message conversion means 71, 72, 73, where the transmission message serial number 100, 20
Value 2 obtained by adding message data length 100 to 0,300
00, 300, and 400 are held in the communication management means 61, 62, and 63 as held transmission message serial numbers, respectively, and the communication message conversion means 71, 72, and 73 are stored.
In this case, the transmission message serial number is converted in accordance with the algorithm (2-2).
Since the held received message confirmation numbers (before update) and (after update) held in 1, 62, and 63 are both 0, the serial numbers of the transmitted messages from the servers 31, 32, and 33 remain unchanged. 71, 72, 7
3 to the communication message selection means 5.

The communication message selection means 5 receives “100, 101”, “200, 101”, “30” as the transmission message serial number and the reception message confirmation number supplied via the communication message conversion means 71, 72, 73, respectively.
When a communication message having “0, 101” is received, the transmission message serial number “100, 101” of the communication message is received.
200, 300 ”, for example, in this embodiment,“ 200 ”is selected, and a communication message in which“ 200, 101 ”is set as the transmission message serial number and the reception message confirmation number is used as the communication 12 as the client 1
Send to

When the communication 1 is completed as described above, the client 1 makes the communication 21 a transmission message serial number and a reception message confirmation number of “101, 300”.
Is transmitted. In this case, the received message confirmation number “300” is the received message confirmation number “200” received through the communication message selecting unit 5.
And the message data length of 100 bytes.

This communication message "101, 300"
Means that each of the servers 31, 32,
33, and transmitted to communication management means 61, 62, 63 and communication message conversion means 71, 72, 73. Then, the communication management means 61, 62, and 63 hold the received message confirmation number 300 as a held received message confirmation number (before updating), and the communication message converting means 71, 72, and 73 store the received message confirmation number 30
0 is converted as a received message confirmation number by the held transmission message serial number 200, 300, 400 previously held by the communication management means 61, 62, 63, and the communication message having the converted received message confirmation number 200, 300, 400 "101,200", "101,300",
"101, 400" is assigned to each server 31, 32, 3 respectively.
Send to 3. In this case, the communication management means 61, 6
Reference numerals 2 and 63 denote received message confirmation numbers 200, 300 and 4 converted by the communication message converting means 71, 72 and 73, respectively.
00 is held as the held received message confirmation number (after update). The servers 31, 32, and 33 communicate with the communication messages “101, 200”, “101, 300”, “101,
400 ", thereby terminating the communication 21.

The servers 31, 32, and 33 communicate with the communication messages “101, 200”, “101, 30”, respectively.
When "0" and "101,400" are received, a reception message confirmation number is generated by adding the message data length 100 to the transmission message serial number 101 of the communication message.
1 "," 300, 201 ", and" 400, 201 "are transmitted to the communication management means 61, 62, 63 and the communication message conversion means 71, 72, 73. Communication management means 61, 6
2 and 63 are transmission message serial numbers 20 of the communication message.
A value obtained by adding the message data length 100 to 0, 300, 400 is held.
Reference numerals 2 and 73 denote stored reception message confirmation numbers (before update) 300 held in the communication management means 61, 62 and 63 + transmission message serial numbers 200 and 300 of the communication message.
400—the held reception message confirmation number (after update) held in the communication message conversion means 71, 72, 73 (2)
00, 300, and 400 are calculated, and different transmission message serial numbers 200, 300, and 400 are respectively converted to the same transmission message serial number 300, and the communication message “300, 2
01 "," 300, 201 "and" 300, 201 "are transmitted to the communication message selecting means 5. The communication message selecting means 5 selects one of these communication messages and sends it to the client 1 as a communication message "300, 201". The client 1 receives the communication message and terminates the communication 22. Hereinafter, similarly, the client 1 starts the communication 3.

In each of the above embodiments, FIG.
Is a communication management unit 6 and a communication message conversion unit 7 for a plurality of servers 31, 32, 33.
Are collectively provided in the network 2, and the embodiment shown in FIG. 4 has a plurality of servers 31, 32, 33.
The communication management means 61, 62, 63 and the communication message conversion means 71, 72, 73 are respectively provided in a distributed manner corresponding to each server. There is no limitation, and the communication management means and the communication message conversion means are divided into a plurality of parts corresponding to intermediates thereof, a client group or a server group, and further provided in a network, and provided on a client side. And the server side, etc., and these variations can be similarly applied to the communication message distribution means and the communication message selection means, and the configuration of the client / multiplex server system is Various combinations are possible by combining.

Further, in the embodiment shown in FIG. 4, the holding transmission message serial number of the algorithm (1-2) held in the communication management means 61, 62, 63 has been described as the communication message serial number + message data length. In this case, the communication management means 61, 62, 63 may hold only the transmission message serial number, and the message data length may be added by the communication message conversion means 71, 72, 73.

Further, in each of the above-described embodiments, the communication management means and the communication message conversion means are shown as separate units, but the present invention is not limited to this. Converts different outgoing message serial numbers to the same outgoing message serial number based on the communication message from the client, and supports the same received message confirmation number of the communication message from the client to multiple servers for each server based on the communication message from each server What is necessary is just to have a function of converting each received message confirmation number into a different one, and this can be achieved by, for example, a conversion means having such a function.

[0062]

As described above, according to the present invention,
The communication message addressed to each server from the client is transmitted to each server after the same received message confirmation number in the communication message is converted to a different received message confirmation number corresponding to each server, and is transmitted to each server. Since the different transmission message sequence numbers in the communication message are converted to the same transmission message sequence number and transmitted to the client, the client is unaware of the multiplexing server and can operate in the same manner as in the case of single processing. Therefore, it is possible to suppress an increase in the process turnaround time without increasing the overhead of the communication protocol processing or the traffic of the network.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a client / multiplex server system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a communication message used in the client / multiplex server system shown in FIG. 1;

FIG. 3 is a diagram showing a flow of a communication message between a client and each server in the client / multiplex server system shown in FIG. 1;

FIG. 4 is a diagram showing a configuration of a client / multiplex server system according to another embodiment of the present invention.

5 is a diagram showing an example of a communication sequence viewed from a client performing communication using a delivery confirmation type TCP / IP protocol in the client / multiplex server system shown in FIG. 4;

FIG. 6 is a diagram showing the sequence of transmission messages held by the client, each server, and each communication management means when the client / multiplex server system shown in FIG. 4 performs communication between the client and each server in the communication sequence shown in FIG. FIG. 7 is a diagram showing an initial value and a temporal transition of a received message confirmation number.

7 is a destination address of a communication message at each point in the client / multiplex server system shown in FIG. 4;
It is a figure which shows a transmission source address, a transmission message serial number, and a reception message confirmation number for every communication.

8 is a diagram showing a transmission message serial number and a reception message confirmation number of each communication message in communication between the client and each server shown in FIGS. 6 and 7 for each communication and each point.

FIG. 9 is a diagram showing a configuration example of a conventional client / multiplex server system.

FIG. 10 is a diagram showing another configuration example of a conventional client / multiplex server system.

FIG. 11 is a diagram showing another configuration example of a conventional client / multiplex server system.

FIG. 12 is a diagram showing an example of a communication message used in the client / multiplex server system shown in FIG. 11;

[Explanation of symbols]

 1 Client 2 Network 4 Communication Message Distribution Means 5 Communication Message Selection Means 6, 61, 62, 63 Communication Management Means 7, 71, 72, 73 Communication Message Conversion Means 31, 32, 33 Server

Claims (4)

[Claims] 1. A client having a client and a plurality of servers connected to a network, transmitting a process from the client to the plurality of servers via the network, and executing the process on the plurality of servers and each server. A client / multiplexing server system for performing communication between the client and the multiplexing server using a delivery confirmation type one-to-one communication protocol in which a transmission message serial number and a reception message confirmation number are set in each communication message and mutually transmitted and received, Communication message distribution means for distributing and transmitting a communication message from the client to each server to a plurality of servers; and selecting one communication message from a plurality of communication messages from the plurality of servers to the client, Means for selecting a communication message to be transmitted to the client; The different transmission message serial numbers of the communication messages to the client are converted into the same transmission message serial number based on the communication message from the client, and the same reception message confirmation number of the communication message from the client to a plurality of servers is transmitted from each server. Conversion means for converting the received message confirmation number corresponding to each server based on the communication message to a different received message confirmation number. 2. A client having a client and a plurality of servers connected to a network, transmitting a process from the client to the plurality of servers via the network, and executing the process on the plurality of servers and each server. A client / multiplexing server system for performing communication between the client and the multiplexing server using a delivery confirmation type one-to-one communication protocol in which a transmission message serial number and a reception message confirmation number are set in each communication message and mutually transmitted and received, Communication message distribution means for distributing and transmitting a communication message from the client to each server to a plurality of servers; and selecting one communication message from a plurality of communication messages from the plurality of servers to the client, Means for selecting a communication message to be transmitted to the client; Holds the received message confirmation number of the communication message sent to each server via the message distribution means, and holds the transmission message serial number of the communication message sent from each server to the client corresponding to each server. Communication management means, and the same received message confirmation number of each communication message transmitted from the client to each server via the communication message distribution means, corresponding to each server in the communication management means. Based on the outgoing message serial number, each server converts the received message confirmation number corresponding to each server to a different received message confirmation number, and transmits the different outgoing message serial number corresponding to each server of the communication message transmitted from each server to the client. Incoming messages stored in the control means And a communication message converting means for converting to a same transmission message serial number based on the message confirmation number and the different transmission message serial numbers. 3. The communication management means and the communication message conversion means are provided between the communication message distribution means and the communication message selection means and each server in a distributed manner corresponding to each server. 3. The client / multiplex server system according to claim 1, wherein: 4. The received message confirmation number held by the communication management means is a received message confirmation number before conversion by the communication message conversion means and a received message confirmation number after conversion by the communication message conversion means. Converting the same received message confirmation number into a different received message confirmation number for each server, the communication management means stores the message data length in each of the transmitted message serial numbers held corresponding to each server. To generate a different received message confirmation number corresponding to each of the servers, and the communication message converting means converts each of the different outgoing message serial numbers corresponding to each of the servers into the same outgoing message serial number. The received message confirmation number before the conversion Claim 2 or 3 wherein the client / multiplexing server system, characterized in that by adding the difference obtained by subtracting the received message confirmation number after the conversion from over-di serial number to generate the same transmission message sequence number.