JP2000341361A - Information transfer method and recording medium recording information transfer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the connection time of an accessed channel and to reduce a resident time of information in a proxy computer. SOLUTION: A client computer C generates a reference request list in which a reference request to information of one item or over is described and sets up an access channel A, transmits the list to a proxy computer P, and interrupts the access channel A. The proxy computer P transmits a proxy reference request to server computers S1, S2, S3 storing all reference request object information sets described in the list, receives the reference request object information, sets up the access channel A, transmits the reference request object information to the client computer C and interrupts the access channel A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a server comprising a server computer, a client computer and a proxy computer.
In a client computer system, a network such as the Internet is used for a connection line between a server computer and a proxy computer, and an information transfer method in a case where a line connecting the client computer and the proxy computer is an emergency connection type line, and The present invention relates to a recording medium on which an information transfer program is recorded.

[0002]

2. Description of the Related Art Conventionally, a server computer for providing a service for providing information on an information communication network, a client computer for making a reference request to the server computer and using the service, and an intervening system between the client computer and the server computer. A server / client type information transfer method including a proxy computer that issues a proxy reference request in response to a reference request from a client computer is known.

When a client computer makes a request for referring to information stored in a server computer connected to the Internet, the client computer transmits a request for referring to information to a proxy computer using an access line. Since the proxy computer that has received the reference request performs proxy reference request processing for the server computer, the information requested for the reference request is transmitted from the server computer to the proxy computer, and further transmitted from the proxy computer to the client computer.

In such an information transfer method, an access line, which is a communication medium between a client computer and a proxy computer, is not an emergency connection type line (a connection line such as a dedicated line, but a connection line only for communication time). In this case, a procedure of establishing and disconnecting the connection of the access line is required. Regarding the establishment of the connection of the access line, (1) the connection state of the access line is maintained until the client computer establishes the connection of the access line, transmits the reference request, and finishes receiving the reference request target information. Method (2) After the client computer establishes the connection of the access line, transmits the reference request, and then temporarily disconnects the connection of the access line, and after an elapse of an arbitrary time, the client computer establishes the connection of the access line again. There are two methods, such as a method of receiving reference request target information.

FIG. 7 is a diagram showing a sequence at the time of an information reference request in a conventional computer system using the method (1). First, the client computer C establishes an access line connection (step 201 in FIG. 7), and transmits a reference request to the proxy computer P via the access line (step 202). Next, the proxy computer P transmits a proxy reference request for the information a to the server computer S1 via the Internet according to the reference request (process 203). Server computer S
1 transmits information a to the proxy computer P via the Internet according to the proxy reference request (process 204). The proxy computer P transmits the received information a to the client computer C via the access line (process 205). After receiving the information a, the client computer C disconnects the connection of the access line (process 206).

FIG. 8 is a diagram showing a sequence at the time of an information reference request in a conventional computer system using the method (2). First, the client computer C establishes an access line connection (process 301 in FIG. 8), and transmits a reference request to the proxy computer P via the access line (process 3).
02), the connection of the access line is disconnected after transmission (step 303). Next, the proxy computer P transmits a proxy reference request for the information a to the server computer S1 via the Internet according to the reference request (process 304). After an arbitrary time has elapsed since the access line was disconnected, the client computer C
The connection of the access line is established again (process 305), and a transfer request is transmitted to the proxy computer P via the access line (process 306). Here, since the proxy reference request processing is being performed, information indicating "processing of proxy reference request processing" is transmitted from the proxy computer P to the client computer C (step 307). According to this information, the client computer C
Disconnects the connection of the access line (process 308).

Next, the server computer S1 transmits the information a to the proxy computer P via the Internet according to the proxy reference request (process 309). After an elapse of an arbitrary time from the disconnection of the access line, the client computer C establishes the connection of the access line again (process 310), and transmits a transfer request to the proxy computer P via the access line (process 311). The proxy computer P transmits the information a received from the server computer S1 to the client computer C via the access line (process 312). After receiving the information a, the client computer C disconnects the connection of the access line (process 313).

[0008]

In the conventional information transfer method, a client computer is connected to a proxy computer by a time-charging type emergency connection type access line.
When making one or more information reference requests to a server computer connected to the Internet, (a) an increase in the time required for response processing of the server computer due to concentration of processing on the server computer (b) on the Internet (C) Increase in information transfer time when passing through an access line with low information transfer capacity per unit time (d) Processing concentrated on proxy computer As a result, there is a problem that the time required for proxy reference request processing of the proxy computer increases.

In the information transfer method using the method (1), the access line remains connected at least from before the client computer transmits the reference request until the reference request target information is received from the proxy computer. Therefore, if the above-described problem occurs, (e) an increase in the time from when the client computer transmits the reference request to when the client computer starts receiving the reference request target information, that is, what information is transmitted on the access line. (F) The information transfer time from the proxy computer to the client computer increases. This means that the time required to maintain the connection establishment state of the access line increases, and since the access line is a time-charging type line, the problem that the line usage fee increases accordingly. appear.

In the information transfer method using the method (2), after transmitting the reference request, the connection of the access line is temporarily disconnected, and after an elapse of an arbitrary time, the client computer establishes the connection of the access line again. However, it is impossible for the client computer to accurately predict the time at which the proxy computer completes the proxy reference request processing. Therefore, if the proxy computer is in the middle of proxy reference request processing when the access line is reconnected, the client computer must wait while maintaining the connection of the access line until this processing is completed. Occurs. Alternatively, when not waiting, there arises a problem that the connection of the access line must be disconnected once and the client computer needs to establish the connection of the access line again after an elapse of an arbitrary time. On the other hand, if the time has elapsed since the proxy reference request processing was completed when the access line was reconnected, a problem occurs in which the reference request target information stays in the proxy computer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the time during which information is not transferred among the line connection times, and to reduce the rate corresponding to the information transfer capacity per unit time of the access line. To provide an information transfer method and a recording medium on which an information transfer program is recorded, which can reduce the residence time of reference request target information in a proxy computer while reducing the information transfer time by transferring information by using Aim.

[0012]

According to the information transfer method of the present invention, when the client computer (C) makes an information reference request, the client computer (C) stores the information stored in the server computer (S1, S2, S3).
After creating a reference request list describing reference requests for more than two pieces of information, the access line (A) is established, and the access line is disconnected after transmitting the list to the proxy computer (P). is there. In the conventional information transfer method, when referring to n pieces of information, the client computer transmits a reference request n times, whereas in the present invention,
When referring to n pieces of information, the client computer specifies n pieces of reference requests in one reference request list and performs one transmission.

Further, according to the information transfer method of the present invention, the proxy computer (P) stores all of the reference request target information described in the reference request list received from the client computer (C) and stores them in each server computer. (S1, S
2, after transmitting the proxy reference request to S3) and receiving the reference request target information, establish the access line (A);
The access line is disconnected after transmitting the reference request target information received from the server computer to the client computer. In the conventional information transfer method, (1) a method in which a client computer establishes an access line connection, transmits a reference request, and maintains an access line connection established state until the client computer finishes receiving the reference request target information ( 2) After the client computer establishes the connection of the access line and sends the reference request, the client computer temporarily disconnects the connection of the access line, and after an elapse of an arbitrary time, the client computer establishes the connection of the access line again, and the reference request. There are two methods, such as a method of disconnecting the access line after receiving the target information. That is, in the conventional information transfer method, only the client computer establishes and disconnects the connection of the access line, whereas in the present invention, the proxy computer also establishes and disconnects the connection of the access line.

Further, the recording medium storing the information transfer program of the present invention prepares a reference request list in which reference requests for one or more pieces of information stored in the server computer are described, and transmits the reference request list to the proxy computer. The client establishes an intervening emergency connection type access line, transmits the list to the proxy computer via the access line, disconnects the access line, and receives reference request target information from the proxy computer. An information transfer program to be executed by the computer, a process of transmitting a proxy reference request to the server computer via a network interposed between the server computer and the server in response to the reference request received from the client computer, Sending the reference request target information to the client computer via the access line An information transfer program for causing a proxy computer to execute, and an information transfer program for causing a server computer to execute processing of transmitting reference request target information to a proxy computer via a network according to a proxy reference request received from a proxy computer are recorded. Things. Further, the recording medium on which the information transfer program of the present invention is recorded is a process for transmitting a reference request for information stored in the server computer to the proxy computer via an emergency connection type access line interposed between the server and the proxy computer. When,
The information transfer program for causing the client computer to execute the process of receiving the reference request target information from the proxy computer, and all the reference request target information described in the reference request list received from the client computer are stored. After transmitting a proxy reference request to each server computer via the network interposed between the server computers and receiving the reference request target information, establish an access line and access the reference request target information received from the server computer. An information transfer program for causing the proxy computer to execute a process of disconnecting the access line after transmitting to the client computer via the line, and the reference request target information to the proxy computer via the network according to the proxy reference request received from the proxy computer Execute the transmission process on the server computer The information transfer program for causing is a record.

[0015]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a computer system according to an embodiment of the present invention. 1 includes a plurality of server computers S1, S2, S3, a client computer C, a proxy computer P, an access line A connecting the client computer C and the proxy computer P, and a server computer S.
The Internet I, which is a network that connects the proxy computer P with S1, S2, and S3.

FIG. 2 is a block diagram showing an example of the configuration of the client computer C. Client computer C is C
PU1, ROM (Read Only Memory) 2, RAM (Rando
m Access Memory) 3, display controller 4 serving as an interface with display device 10, keyboard 1
1, a keyboard control unit 5 serving as an interface with an auxiliary storage device 7 such as a floppy disk device, and an external storage serving as an interface with a large-capacity external storage device 12 such as a hard disk device. It comprises a device controller 8, a bus 9, and a communication controller 13 connected to the access line A.

The CPU 1 executes a process according to a program stored in the ROM 2, the RAM 3 or the external storage device 12, or a command input from the keyboard 11. The CPU 1 includes a bus 9, an auxiliary storage device control unit 6
, Data can be written to the auxiliary storage device 7, and data can be read from the device 7. Similarly, data can be written to and read from the external storage device 13 via the bus 9 and the external storage device control unit 9.

Further, the CPU 1 establishes a connection with the access line A via the bus 9 and the communication control unit 13, transmits data to the access line A, receives data from the access line A, The connection with the access line A can be disconnected. Then, the CPU 1 transmits the VRAM (Video) in the display control unit 4 via the bus 9.
The image data is written into the RAM (RAM) 14. As a result, an image signal is output from the display control unit 4, and an image is displayed on the display device 10.

The above-described configuration of the computer is the same for the proxy computer P and the server computers S1, S2, S3. In the computer system as shown in FIG. 1, a program for realizing the information transfer method of the present invention is provided in a state recorded on a recording medium such as a floppy disk, a CD-ROM, and a memory card.

This recording medium is stored in server computers S1, S2,
S3, when inserted into each of the auxiliary storage devices 7 of the client computer C and the proxy computer P, the program recorded on the medium is read. Then, the CPU 1 of each computer stores the read program in the RAM 3 or the external storage device 1.
2 and the following processing is executed according to this program.

In this embodiment, a file transfer will be described as an example of information transfer in the computer system of FIG. It is assumed that information a is stored in the server computer S1, information b is stored in the server computer S2, and information c is stored in the server computer S3. Proxy computer P
Indicates that each server computer S1, S
2. It is assumed that the information received from S3 can be stored in the storage device.

The client computer C recognizes which server computer stores the information to be referred to,
It is assumed that information received from the proxy computer P can be stored in the storage device. Access line A, which is a communication medium between client computer C and proxy computer P
Is a line of an emergency connection type and a time accounting system.

The communication medium between the proxy computer P and the server computers S1, S2, S3 is the Internet I. The Internet I is a large-scale network in which various networks are interconnected, and an unspecified number of computers connected to each of the constituent networks share a line and perform communication.

FIG. 3 is a diagram showing a sequence at the time of an information reference request in the computer system of the present embodiment. Here, it is assumed that a reference request for the information a stored in the server computer S1 is made from the client computer C.
First, the client computer C creates an information reference request list (process 101 in FIG. 3).

The information reference request list contains a character string (for example, information name) D that can identify the information to be referred to.
A reference request that describes a set of S and a character string SS that can identify the server computer storing the reference request target information is described. This reference request is described in one or more sets. Therefore, the content of the information reference request list for the information a stored in the server computer S1 has a format as shown in FIG.

After creating the information reference request list, the client computer C establishes the connection of the access line A (FIG. 3).
Process 102). After the connection of the access line A is established, the client computer C transmits a reference request, that is, an information reference request list to the proxy computer P via the access line A (process 103 in FIG. 3). Then, the client computer C disconnects the connection of the access line A (process 104 in FIG. 3).

Next, the proxy computer P refers to the information reference request list received from the client computer C (process 105 in FIG. 3). And the proxy computer P
According to the reference request described in the information reference request list,
A proxy reference request for the information a is transmitted to the server computer S1 via the Internet I (process 106 in FIG. 3).

Next, the server computer S1 transmits the information a to the proxy computer P via the Internet I in accordance with the proxy reference request received from the proxy computer P (FIG. 3).
Process 107). Proxy computer P that received information a
Establishes the connection of the access line A (step 10 in FIG. 3).
8).

Subsequently, the proxy computer P transmits the information a received from the server computer S1 to the client computer C via the access line A (process 109 in FIG. 3).
After transmitting the information a, the proxy computer P sends the access line A
Is disconnected (process 110 in FIG. 3). Then, the client computer C stores the information a received from the proxy computer P in the storage device.

FIG. 5 is a diagram showing a sequence at the time of a plurality of information reference requests in the computer system of the present embodiment, and the same processes as those in FIG. 2 are denoted by the same reference numerals. Here, it is assumed that a request to refer to a plurality of pieces of information a, b, and c stored in the server computers S1, S2, and S3 is made from the client computer C.

First, the client computer C creates an information reference request list (process 101a in FIG. 5). Here, since a reference request for a plurality of pieces of information a, b, and c stored in the server computers S1, S2, and S3 is made, the content of the information reference request list has a format as shown in FIG.

After creating the information reference request list, the client computer C establishes the connection of the access line A (FIG. 5).
Process 102). After the connection of the access line A is established, the client computer C transmits an information reference request list to the proxy computer P via the access line A (Process 1 in FIG. 5).
03). Then, the client computer C disconnects the connection of the access line A (process 104 in FIG. 5).

Next, the proxy computer P refers to the information reference request list received from the client computer C (process 105 in FIG. 5). And the proxy computer P
According to the reference request described in the information reference request list,
A proxy reference request is transmitted to each server computer via the Internet I.

Since three reference requests are described in the information reference request list, the proxy computer P first transmits a proxy reference request for information a to the server computer S1 (process 106a in FIG. 5), and then A proxy reference request for information b is transmitted to the server computer S2 (process 106b in FIG. 5), and a proxy reference request for information c is transmitted to the server computer S3 (process 106c in FIG. 5).

Next, the server computer S1 transmits the information a to the proxy computer P via the Internet I in accordance with the proxy reference request received from the proxy computer P (FIG. 5).
Process 107a). Similarly, the server computer S2, in accordance with the proxy reference request received from the proxy computer P,
Is transmitted to the proxy computer P via the Internet I (process 107b in FIG. 5). And the server computer S3
Transmits the information c to the proxy computer P via the Internet I according to the proxy reference request received from the proxy computer P (process 107c in FIG. 5).

The proxy computer P having received the information a, b, and c establishes the connection of the access line A (Process 1 in FIG. 5).
08). After the connection of the access line A is established, the proxy computer P transmits the information a received from the server computer S1 to the client computer C via the access line A (Step 109a in FIG. 5), and similarly receives the information a from the server computer S2. Information b is transmitted to the client computer C (process 1 in FIG. 5).
09b), and information c received from the server computer S3
Is transmitted to the client computer C (step 109 in FIG. 5).
c).

After transmitting the information items a, b, and c, the proxy computer P disconnects the connection of the access line A (process 1 in FIG. 5).
10). Then, the client computer C stores the information a, b, and c received from the proxy computer P in the storage device.

[0038]

According to the present invention, a client computer creates a reference request list in which a reference request for one or more pieces of information stored in a server computer is described, establishes an access line, and sends the access line to the proxy computer. Since the access line is disconnected after transmitting the list, n reference requests can be transmitted in one reference request list, and the information transfer time, that is, the access line connection time can be reduced. As a result, the cost of using the line can be reduced.

Further, the proxy computer transmits a proxy reference request to each server computer storing the reference request target information described in the reference request list received from the client computer, and transmits the reference request target information. After receiving the access request, the access line is established, the reference request target information received from the server computer is transmitted to the client computer, and then the access line is disconnected. Connection time can be reduced. Furthermore, after temporarily storing the reference request target information transmitted from the server computer, the proxy computer establishes the access line and transmits it to the client computer, so that at a rate corresponding to the information transfer capacity per unit time of the access line. , And the information transfer time, that is, the connection time of the access line can be reduced. As a result, the cost of using the line can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a computer system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a client computer.

FIG. 3 is a diagram showing a sequence at the time of an information reference request in the computer system of FIG. 1;

FIG. 4 is a diagram showing a format of an information reference request list.

FIG. 5 is a diagram showing a sequence at the time of a plurality of information reference requests in the computer system of FIG. 1;

FIG. 6 is a diagram showing a format of an information reference request list.

FIG. 7 is a diagram showing a sequence at the time of an information reference request in a conventional computer system.

FIG. 8 is a diagram showing a sequence at the time of an information reference request in another conventional computer system.

[Explanation of symbols]

A: access line, C: client computer, I: Internet, P: proxy computer, S1, S2, S3 ...
Server calculator.

Claims (4)

[Claims] 1. A server computer, a client computer, a proxy computer interposed between a server computer and a client computer, an emergency connection type access line connecting the client computer and the proxy computer, and a proxy computer and a server computer. In an electronic computer system including a network to be connected, a process in which a client computer transmits a reference request for information stored in a server computer to a proxy computer via an access line, and a process in which the proxy computer receives a reference request received from the client computer. Transmitting the proxy reference request to the server computer via the network in response to the request, and transmitting the reference request target information to the proxy computer via the network in accordance with the proxy reference request received from the proxy computer. When the computer performs a process of transmitting the reference request target information received from the server computer to the client computer via the access line, and a process in which the client computer receives the reference request target information from the proxy computer, the client computer Creates a reference request list describing reference requests for one or more pieces of information stored in the server computer, establishes an access line, and disconnects the access line after transmitting the list to the proxy computer. Characteristic information transfer method. 2. A server computer, a client computer, a proxy computer interposed between a server computer and a client computer, an emergency connection type access line connecting the client computer and the proxy computer, and a proxy computer and a server computer. In an electronic computer system including a network to be connected, a process in which a client computer transmits a reference request for information stored in a server computer to a proxy computer via an access line, and a process in which the proxy computer receives a reference request received from the client computer. Transmitting the proxy reference request to the server computer via the network in response to the request, and transmitting the reference request target information to the proxy computer via the network in accordance with the proxy reference request received from the proxy computer. When the computer transmits the reference request target information received from the server computer to the client computer via the access line and the client computer performs the process of receiving the reference request target information from the proxy computer, the proxy computer For all the reference request target information described in the reference request list received from the client computer, after transmitting a proxy reference request to each server computer storing them and receiving the reference request target information, the access line And transmitting the reference request target information received from the server computer to the client computer, and then disconnecting the access line. 3. A reference request list describing a reference request for one or more pieces of information stored in the server computer is created, and an emergency connection type access line interposed between the proxy computer and the proxy computer is established. An information transfer program for causing a client computer to execute a process of disconnecting the access line after transmitting the list to the proxy computer via the access line, and a process of receiving reference request target information from the proxy computer; Sending a proxy reference request to the server computer via a network interposed between the server computer and the server in response to the reference request received from the server, and transmitting the reference request target information received from the server computer to the client computer via the access line An information transfer program for causing the proxy computer to execute the transmitting process; and Recording medium recording the information transfer program for references requested information via a network to execute a process of transmitting to the proxy computer to the server computer in accordance with proxy reference request received from the proxy computer. 4. Processing for transmitting a reference request for information stored in a server computer to a proxy computer via an emergency connection type access line interposed between the server and the proxy computer, and reference request target information from the proxy computer Information transfer program for causing the client computer to execute the process of receiving the request, and proxy reference to each server computer that stores these for all the reference request target information described in the reference request list received from the client computer After the request is transmitted through the network interposed between the server computer and the reference request target information is received, an access line is established, and the reference request target information received from the server computer is transmitted to the client computer via the access line. To cause the proxy computer to execute the process of disconnecting the access line after Information transfer program and a recording medium recording the information transfer program for executing the reference requested information via the network in accordance with the proxy reference request received from the proxy computer processing for transmitting to the proxy computer to the server computer.