JP2000040051A - Method and device for transmitting message in client server system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently retrieve a request corresponding to a reply from a server on a client memory in message transmission in a client server system. SOLUTION: This message transmitting method is provided with a process in which an identifier by a random number is produced at every separate request message transmitted from a client, a process in which the corresponding identifier is added to each request message and the added message is stored in a storage device on a client side, a process in which the corresponding identifier and a memory address where the request message of the storage device is stored are added to each request message and the added message is transmitted to a server, a process in which the identifier and memory address which are added to the request message to a reply message to the request message from the server and the added message is returned and a process in which the client side retrieves and extracts a request message having the identifier and memory address which are attached to the replay message.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method and apparatus for transmitting a message in a client-server system.

[0002]

2. Description of the Related Art In a client-server type computer system (hereinafter referred to as a client-server system), when a client makes a plurality of requests to a server, that is, when a client makes a request, a response from the server, that is, a It is necessary to determine whether it is. For this purpose, when transmitting a request, the client adds a predetermined identifier to the request message, and stores this in a memory on the client side. Then, when a reply message for the request is returned from the server side, the client refers to the identifier of the request added to the reply message, searches the memory of the client for the request having the identifier, and finds a match. I try to choose things.

In such message transmission, when there are a large number of clients that can access a server, a conflict that the identifier matches the identifier of a request transmitted from another client, that is, a conflict problem occurs. There is. In particular, when a value that changes regularly, such as a counter value, is used as an identifier, the probability of a conflict increases. Therefore, in the conventional client-server system, in order to minimize the establishment of the conflict,
It has been performed to generate a random number and use it as an identifier.

[0004]

In the above conventional message transmission, the requests stored in the memory of the client are arranged in the order of their dispatch.
If the replies are returned in the order in which the requests are dispatched, the above identifiers may be processed in order from the front address of the memory. However, in a client-server system, since the order of replies is not guaranteed to follow the order of requests, it is necessary to sequentially search the memory for requests with the same identifier, which takes time. There's a problem.

Further, when the number of clients increases, the number of request messages handled by the server increases, and it is difficult to completely avoid the above-mentioned conflict problem even when a random number is used as an identifier.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a message transmission method and a message transmission device which can efficiently search for the above request by using address information on a memory storing the request.

Another object of the present invention is to provide a message transmission method and apparatus which can further reduce the conflict problem by combining the address information with a random number identifier.

[0008]

In order to achieve the above object, according to the present invention, in a message transmission method in a client-server system, a step of generating a request identifier using a random number for each request message transmitted from the client. Adding the corresponding request identifier to each of the request messages, and storing the request message in the client-side storage device;
Adding, to each of the request messages, the corresponding request identifier, and a memory address of the storage device storing the request message, and transmitting the request message to the server; and a reply message to the request message from the server. Adding the request identifier and the memory address added to the request message, returning, and request message having the request identifier and the memory address added to the reply message,
Searching and extracting on the client side.

According to the present invention, in a method for transmitting a message in a client-server system, a step of storing an individual request message transmitted from the client in a storage device on the client side; A client identifier for identifying the request, and a memory address of the storage device storing the request message,
A step of transmitting to the server, a step of adding the client identifier and the memory address added to the request message to a reply message to the request message from the server, and returning, and a client having the client identifier. A step of retrieving the memory address added to the reply message and extracting a request message corresponding to the reply message.

According to the present invention, in a method for transmitting a message in a client-server system, a step of generating a request identifier by a random number for each request message transmitted from the client; Adding the corresponding request identifier to the storage device on the client side, and storing, in each of the request messages, a client identifier for identifying the client, the request identifier, and the request message of the storage device. Adding the stored memory address to the server and transmitting the message to the server; and replying to the request message from the server in response to the request message. Adding a differentiator, the request identifier and the memory address, and returning the message; and searching for the memory address and the request identifier added to the reply message on the client side having the client identifier, And extracting a request message corresponding to the request.

Further, the present invention provides a message transmission device in a client-server system, wherein a means for generating a request identifier by a random number for each request message transmitted from the client, and the request corresponding to each request message are provided. Adding an identifier, means for storing in the client-side storage device, and, for each of the request messages, adding the corresponding request identifier, and a memory address of the storage device storing the request message,
Means for sending to the server, means for adding the request identifier and the memory address added to the request message to a reply message for the request message from the server, and means for replying; and means for replying to the reply message. Means for searching and extracting a request message having the request identifier and the memory address on the client side.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings. FIG. 1 is a diagram conceptually showing message transmission in a client-server system. The figure shows that the server 10 receives a request message 12 from a client 11 and returns a reply message 13. The request message 12 indicates that the client 11
Is a message requesting predetermined processing, for example, transfer of data on the server. Each request message 12 includes a request ID as described in detail later.
An identifier called "20" is added, thereby identifying between request messages. Prior to the transmission of the request message 12, the client 11 temporarily stores the request message 12 in its own memory 14. In a predetermined memory area on the memory 14, the request content, that is, the request portion in the request message and the random number in the request ID 20 described later are sequentially stored. Each request content in the memory 14 is discarded from the memory when the client 11 receives the corresponding reply message 13 from the server 10 and confirms it.

The reply message 13 is a response message transmitted from the server 10 to the request message 12 from the client 11. The server 10 sends the reply message 13 to the client 11
, The request ID 20 added to the original request message 12 is added to the reply message 13. By referring to the request ID 20, the client 11 can know which request message 12 the reply message 13 transmitted from the server 10 is for.

FIG. 2 shows the contents of a message used in message transmission according to the present invention.
As described above, the request message 12 and the corresponding reply message 13 include the same request ID 20. By searching for a request message 12 having a request ID that matches the request ID of the reply message 13 on the client 11, it is possible to establish a correspondence between the request and the reply.

Here, the request ID 20 is composed of a memory address section 21 and a random number section 22.
In the memory address section 21, the client 11
Of the memory 14 storing the contents of the corresponding request in the memory 14 of FIG. As described above, when transmitting the request message 12, the client 11 stores the contents of the request and the random number in the memory 14. When a plurality of request messages are continuously transmitted from one client 11, the memory 14
At the top, those request contents and random numbers are sequentially accumulated. When transmitting the request message 12 to the server 10, the client 11 acquires the above-mentioned random number and an address on the memory 14 for storing the content of the request, and adds these to the request message 20 as a request ID 20.

FIG. 3 shows a request I provided on the client 11 for generating the request ID 20.
The D generation device 30 is shown. The request ID generation device can be realized by a CPU built in the client 11 and a program executed on the CPU.
The request ID generating device 30 includes a data length determining unit 31 and a counting unit 32 for generating the memory address unit 21 of the request ID 20 and a random number generating unit 33 for generating the random number unit 22.

The data length judging section 31 adjusts the increment (increment) of the counting section 32 according to the sum of the immediately preceding request and the random number stored in the memory 14 (hereinafter, data length). . The data length determining unit 31 is activated every time a request is generated on the client 11 and determines how many memory blocks of the memory 14 the data length occupies. That is, when the data length is L bits and the memory block length is W bits, the output value of the data length determination unit 31 is a value obtained by rounding up the decimal point in the L / W result. Therefore, when L <W, the output value is “1”, and W <
When L <2W, it is "2", and when 2W <L <3W, it is "3".

The counting section 32 is an N-bit counter which holds the previous counter value and, when receiving the output from the data length determining section 31, increments the counter by the output value. As a result, the head address of the data to be stored next is obtained. On the other hand, the random number generation unit 33 generates a random number of a predetermined bit every time a request is generated in the client 11. Like this one
When one request is generated, a predetermined address and a predetermined random number are generated by the request ID generation device 30.

FIG. 4 is a flowchart showing the procedure of message transmission according to the present invention. Hereinafter, a message transmission procedure will be described with reference to FIG. 1 and FIG. When there is a request transmission request from the user on the client 11 side, the request ID generation device 30 is activated, and a request ID 20 including a memory address and a random number is generated.
(401). The contents of the request are stored in the memory 14 of the client together with the random numbers (402). The client 11 transmits a request message 12 to the server 10 together with the generated request ID 20.
(403).

The server 10 receiving the request message 12 performs processing according to the content of the request, and outputs the result as a reply message 13 to the client 1.
1 (404). In this case, the server 10 sends the request ID 2
0 is added to the reply message 13.

The client 11 can refer to the contents of the corresponding request by referring to the address part in the request ID added to the received reply message 13 (405). In this case, the request and the reply can be associated with each other by referring to the random number stored in the target address and comparing it with the random number included in the request ID 20.
That is, even if a reply corresponding to a request issued by another client is received, a random address different from the received reply is stored in the target address. Can be immediately determined.

The embodiment of the present invention has been described with reference to the drawings. However, it is apparent that the present invention is not limited to the matters described in the above embodiments, and that changes, improvements, and the like can be made based on the description in the claims. In the present invention, an arbitrary ID for specifying each client can be further included as the request ID. In this case, the random number may not be included in the request ID.

[0023]

As described above, according to the present invention, a corresponding request in the memory of the client can be easily searched by using the address information in the memory storing the request.

Further, by combining the address information with an identifier based on a random number, the association between the request and the corresponding reply becomes more reliable.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually showing message transmission in a client-server system.

FIG. 2 is a diagram showing the contents of a message used in message transmission according to the present invention.

FIG. 3 shows a request ID generation device provided on a client for generating a request ID.

FIG. 4 is a flowchart showing a procedure of message transmission according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Server 11 Client 12 Request message 13 Reply message 14 Memory 20 Request message 21 Memory address part 22 Random number part 30 Generator 31 Data length judging part 32 Counting part 33 Random number generating part

Claims (4)

[Claims] 1. A method for transmitting a message in a client-server system, comprising: generating a request identifier by a random number for each request message transmitted from the client; and adding the corresponding request identifier to each request message. Storing the request message in the storage device on the client side; and adding the corresponding request identifier and the memory address of the storage device storing the request message to the request message, and transmitting the request message to the server. A step of adding the request identifier and the memory address added to the request message to a reply message to the request message from the server, and returning the reply message; Method of transmitting a message the request message with the added the request identifier and the memory address, and searches the client side, the steps of extraction, comprising the in. 2. A method for transmitting a message in a client-server system, comprising the steps of: storing individual request messages transmitted from the client in a storage device on the client side; and identifying the client in each request message. Adding a client identifier and a memory address of the storage device in which the request message is stored and transmitting the request message to the server; and a client attached to the request message in a reply message to the request message from the server. Replying by adding an identifier and the memory address; and retrieving the memory address added to the reply message on the client side having the client identifier; Method of transmitting a message to a process for extracting a request message corresponding to the message, comprising the. 3. A method for transmitting a message in a client-server system, comprising: generating a request identifier by a random number for each request message transmitted from the client; and responding to each request message transmitted from the client. Adding the request identifier and storing the request message in the storage device on the client side; and a memory storing the client identifier for identifying the client, the request identifier, and the request message of the storage device in each of the request messages. Adding an address to the server and transmitting the request to the server; and a reply message to the request message from the server, the client identifier added to the request message, Adding a request identifier and the memory address and returning the request; and retrieving the memory address and the request identifier added to the reply message on the client side having the client identifier and requesting the request corresponding to the reply message. Extracting a message. A method for transmitting a message. 4. A message transmission device in a client / server system, comprising: means for generating a request identifier by a random number for each request message transmitted from the client; and adding the corresponding request identifier to each request message. Means for storing the request message in the storage device on the client side; and a request identifier corresponding to the request message and a memory address of the storage device storing the request message, and transmitting the request message to the server. Means for replying to the reply message to the request message from the server by adding the request identifier and the memory address added to the request message; and replying to the reply message. Transmission device of a message, characterized in that the request message with the added the request identifier and the memory address, and searches the client side, means for extracting, with a to.