JPH11161589A - Client-server system, method for informing state change of resource in the system and storage medium for programming and recording the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immediately inform a client of the state change of a WWW(world wide web) server by using only an HTTP protocol. SOLUTION: In this client-server system, a request character string generated from the client 1 is analyzed in the command processing part 32 of a server 3 and a communication path is secured between the client and the server through a communication control part 31. Then, in a resource monitoring part 34, a method body corresponding to the HTTP protocol is extracted and the resources of the server are monitored. When the state change of the resources indicated by the method body is present, the client is informed of the conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention particularly relates to a client server system suitable for use in a WWW server, a method for notifying a resource state change in the system, and a recording medium on which the method is programmed and recorded.

[0002]

2. Description of the Related Art In recent years, WWW (World Wide Web) for browsing information via the Internet has rapidly spread. In WWW, by using a browser,
You can browse documents on the server. this is,
This is realized by issuing a document browsing request from a WWW browser to a WWW server, and the WWW server searching and providing a document corresponding to the request.

[0003] In the WWW, in order to know whether or not a document of interest to a user in a server has been updated, the user needs to use the WWW.
It is necessary to confirm sequentially using a W browser. That is,
As long as the user does not request the document from the client (WWW browser), there is no means provided for notifying the client of a status change such as updating of the document in the server. Therefore, the user must frequently make a document request to the server.

Further, there is a service for notifying a user of a change in the state of a server to a user by e-mail. However, a time lag such as transmission of an e-mail exists.

[0005]

Conventionally, in order to know a change in the state of a server, a user must frequently make a document request to the server. , And then HTTP
It had to be done using means other than the protocol.

The present invention has been made in view of the above circumstances, and uses a client server system and a resource management system capable of immediately notifying a client of a change in the state of a WWW server using only the HTTP protocol. An object of the present invention is to provide a state change notification method and a recording medium on which the method is programmed and recorded.

[0007]

A server-client system according to the present invention comprises a client, a client-in-server communication control means for connecting the client via a communication line, and securing a communication path in accordance with a request from the client; A command processing unit in the server that processes a request to be transmitted, a resource monitoring unit in the server that monitors the status of the server itself according to the content of the command, and generation and return of a character string that conveys a status change detected by the resource monitoring unit And a reply reply unit in the server for performing the following.

According to the method for notifying a status change in a server-client system of the present invention, in a client-server system, a request issued from a client is analyzed to secure a communication path with a server, and a method body according to an HTTP protocol is extracted. The resource monitoring of the server is performed, and when there is a change in the state of the resource indicated by the method body, the situation is notified to the client.

A recording medium according to the present invention is used in a server client system for a client to obtain a change in the state of a server, and a step of establishing a communication path with the server in response to a request from the client; Analyzing the sequence, extracting the method body from the request character string and monitoring the resource according to it, detecting the state change of the relevant resource, generating a character string to that effect, and returning it to the requesting client And the steps are programmed and recorded.

[0010] This makes it possible to immediately notify the WWW browser of a change in the state of the WWW server by using only the HTTP protocol, thereby reducing the amount of communication and the load required for it.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a client computer having a WWW browser 11. The client computer 1 is connected to a WWW server 3 via a communication line 2. The WWW server 3 is a communication control unit 3
1, a command processing unit 32, a reply return unit 33, and a resource management unit 34 added according to the present invention.
Reference numeral 4 denotes a keyboard unit.

The character strings shown in FIGS. 2 to 4 and the flowchart shown in FIG. 11 are drawings cited for explaining the operation of one embodiment of the present invention. 1 will be described in detail. The embodiment shown in FIG. 1 shows an example in which a keyboard input event performed on the server 3 side is transmitted to the browser 1 as a state change of the server 3.

First, in response to a request from the WWW browser (client computer 1), the communication control unit 31 of the WWW server 3 secures a communication path with the client. The request character string sent from the browser is sent to the command processing unit 32. The command processing unit 32 analyzes the transmitted request character string (step S1). The request character string is described, for example, as “GET / keyEvent HTTP / 1.0”, and “GET” is replaced by an HTTP method,
The “keyEvent” part is called a method body. Also,
The “HTTP / 1.0” part indicates the version of the compliant HTTP protocol. Here, for simplicity, the command processing unit 32 uses the GET
Only the method is accepted as a correct command. When an incorrect request is sent from the client 1 such as when the request character string is not a GET method or when there is no required item in the character string, the command processing unit 32 sends the error character string to the reply reply unit 33. Send (step S10). In reply reply section 33, HTT
An error character string is returned to the client 1 after adding a header conforming to P (step S11), and a command for closing the communication path is issued to the communication control unit 31 (step S12). The character string returned to the client 1 is as shown in FIG.

When the client 1 has transmitted a correct request as a command, the command processing section 31 first notifies the reply reply section 33 that the correct request has been received (step S3). The reply reply unit 33 transmits the HTTP header to the client 1,
It instructs the communication control unit 31 to continue to secure the communication path (step S4). At this time, the header returned to the client 1 is as shown in FIG.

Further, the command processing section 31 activates the resource monitoring section 34 (step S6). Resource monitoring unit 34
Then, for example, monitoring of input from the keyboard 4 (step S
7) is performed, and if there is a key input, the pressed key character and the pressed time are sent to the reply reply unit 34 (step S8). The reply reply unit 34 sends out the received character string to the communication path that has been previously secured (step S
9). For example, the character string shown in FIG. 4 is transmitted. In this example, the first character represents the key character pressed, and the subsequent character string represents the character string at the time of pressing.

In this manner, a state change on the WWW server 3, that is, a state change in which the keyboard 4 is pressed in this case, can be immediately notified to the WWW browser 1 using only the HTTP protocol.

FIG. 5 is a block diagram showing another embodiment of the present invention.

The embodiment shown in FIG. 5 is different from the embodiment shown in FIG. 1 in that a resource management unit 51 and a resource management database 5 are further added.
2, and a resource monitoring library 53 is added.

The character strings shown in FIG. 6 and FIG. 7 and the flowchart shown in FIG. 12 are diagrams cited for explaining the operation of the embodiment shown in FIG.

The operation of the embodiment of the present invention shown in FIG. 5 will be described below with reference to FIG. Client 1
The request character string transmitted from the command processing unit 3
1 and the protocol is confirmed by the command processing unit 31. If the protocol is correct, the protocol is sent to the resource management unit 51. The operation procedure of the resource management unit 51 is shown in FIG. The resource management unit 51 cuts out the method body from the sent character string (step S21), and
2 (step S22), and confirms whether the character string exists in the resource management database 52 (step S22).
23). FIG. 6 shows an example of a record registered in the resource management database 52. Records constituting the database include a command character string and a resource monitoring processing library 53.
It consists of the name of the routine to be loaded from and the comment text of the processing contents. If the command sent from the client 1 does not exist in the resource management database 52, an error character string shown in FIG. 7 is transmitted to the reply reply unit 33 (step S2).
7) Yes.

If the corresponding command character string exists, the routine name to be loaded is extracted from the record (step S24), and the corresponding resource monitoring routine is extracted from the resource monitoring library 53 (step S24).
25), started as the resource monitoring unit 34 (step S26)
I do. After the activation of the resource monitoring unit 34, it is the same as the embodiment shown in FIG. By using the embodiment shown in FIG. 5, a plurality of resources on the WWW server 3 can be monitored.

FIG. 8 is a block diagram showing still another embodiment of the present invention. In the embodiment shown in FIG. 8, a resource registration / deletion unit 81 is added to the embodiment shown in FIG.

The character strings shown in FIGS. 9 and 10 and the flowchart shown in FIG. 13 are drawings cited for explaining the operation of the embodiment shown in FIG.

The operation of the embodiment shown in FIG. 8 will be described below in detail with reference to the flowchart shown in FIG. Here, in addition to the above-mentioned “GET”, “ADD RESOUR”
It is assumed that there are two types, “CE” and “DEL RESOURCE.” In the case of the “GET” method, the same processing as in the embodiment shown in FIG.
In the case of the “SOURCE” method, the request character string is sent to the resource registration / deletion unit 81.
FIG. 9 and FIG.

FIG. 9 shows a request character string when performing resource registration processing. The first line indicates, in order, the resource registration method, the command character string, and the name of the resource monitoring processing routine. The second line indicates a tag character string indicating the monitoring routine to be transmitted, and the third line indicates the length of the resource monitoring routine to be registered. Here, one blank line is sent, and immediately after that, the actual state of the resource monitoring routine to be registered is sent. The resource registration / deletion unit 81 determines whether the transmitted request is a correct protocol. If the request is correct, the transmitted resource monitoring routine is registered in the resource monitoring processing library 53. Further, a set of a command character string and a resource monitoring routine name is registered in the resource management database 52. Finally, the fact that the registration processing has been normally completed is notified to the reply reply unit 33.

FIG. 10 shows a request character string when the resource deletion processing is performed. This request has only one line, and indicates a command character string representing a resource deletion method and a resource monitoring routine to be deleted. The resource registration / deletion unit 81 refers to the resource management database 52 and checks whether or not the command character string sent in the request exists (steps S32, S34, S36). In the case of "GET", GET command processing (step S33), "ADD RE
SOURCE ”, the resource registration / deletion unit 81 is started by a registration command (step S35), and“ DEL RESOURCE ”
In this case, the resource registration / deletion unit 81 is activated by a deletion command (step S37). If none exists, an error is notified to the reply reply unit 33 (step S3).
8). If the record exists, the corresponding record is deleted from the resource management database 52, and the processing routine is further deleted from the resource monitoring library 53. Finally, the completion of the deletion processing is notified to the reply reply unit 33. By using the embodiment shown in FIG. 8, the client can register and delete the resource monitoring routine.

[0027]

As described above, according to the present invention, in a client server system, a command processing unit built in the server analyzes a request character string issued from the client 1 and communicates with the server via the communication control unit. A route is secured, a resource monitoring unit extracts a method body conforming to the HTTP protocol, performs resource monitoring of the server, and notifies the client of a status change of the resource indicated by the method body when there is a change. This makes it possible to immediately notify the client of a change in the state of the WWW server using only the HTTP protocol. In addition, the amount of communication for this and the load are reduced, so that the system throughput is improved. Furthermore, by preparing a resource monitoring procedure in a library and preparing it in advance, it is possible to manage a plurality of resources on the WWW server. Deletion can be realized by operation from the client.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;

FIG. 2 is a diagram showing a character string quoted for explaining the operation of one embodiment of the present invention;

FIG. 3 is a diagram showing a character string quoted for explaining the operation of one embodiment of the present invention;

FIG. 4 is a view showing a character string quoted for explaining the operation of the embodiment of the present invention;

FIG. 5 is a block diagram showing another embodiment of the present invention;

FIG. 6 is a diagram showing a character string quoted for explaining the operation of another embodiment of the present invention;

FIG. 7 is a diagram showing a character string quoted for explaining the operation of another embodiment of the present invention;

FIG. 8 is a block diagram showing still another embodiment of the present invention;

FIG. 9 is a diagram showing a character string quoted for explaining the operation of still another embodiment of the present invention;

FIG. 10 is a diagram showing a character string quoted for explaining the operation of still another embodiment of the present invention;

FIG. 11 is a flowchart showing the operation of one embodiment of the present invention;

FIG. 12 is a flowchart showing the operation of another embodiment of the present invention;

FIG. 13 is a flowchart showing the operation of still another embodiment of the present invention;

[Explanation of symbols]

1. Client computer (WWW browser), 2.
... Communication line, 3 ... WWW server, 4 ... Keyboard unit, 31 ... Communication control unit, 32 ... Command processing unit, 33 ...
Reply return unit, 34: Resource monitoring unit, 51: Resource management unit, 52: Resource management database, 53: Resource monitoring processing library, 81: Resource registration deletion unit

Claims (9)

[Claims] A client and a client are connected via a communication line, a communication control means in the server for securing a communication path in accordance with a request from the client, and a command processing in the server for processing a request transmitted from the client. Unit, a server resource monitoring unit that monitors its own status according to the content of the command, and a server reply reply unit that generates and returns a character string that conveys a status change detected by the resource monitoring unit. A server-client system. 2. A resource management database constructed as a record using a command character string and a resource monitoring library name, a resource monitoring library in which the resource monitoring library is registered, and a request character string attached to a request issued from a client. 2. The server client system according to claim 1, further comprising: a resource management unit for indexing a resource management database from the library, and extracting and executing a corresponding library from a resource monitoring library based on the obtained library name. 3. The server client system according to claim 2, further comprising a resource registration / deletion unit that registers and deletes a resource monitoring library based on a request from a client. 4. In a client server system,
A request issued from the client is analyzed to secure a communication path with the server, a method body conforming to the HTTP protocol is extracted and resource monitoring of the server is performed, and when the resource state indicated by the method body changes, And reporting the status to the client. 5. A processing procedure for resource monitoring is prepared in advance as a library, and the library is indexed and executed based on a library name obtained by referring to a database using a command character string arriving from a client as a key. 5. The resource status change notification method according to claim 4, wherein the client that has requested the status change of the server resource is notified. 6. A database is created by registering or deleting a processing procedure for resource monitoring, and the database is index-executed to notify a requesting client of a change in the state of server resources. The status change notification method according to claim 5, wherein: 7. In a server client system,
Used by the client to obtain a server state change, establishing a communication path with the server at the request of the client, analyzing the sent request string, and extracting a method body from the request string A computer-readable recording medium on which is programmed and recorded a step of monitoring a resource in accordance therewith, and a step of detecting a change in the state of the corresponding resource, generating a character string to that effect, and returning the character string to a requesting client. 8. A step of accessing the resource management database to check whether the requested character string exists in the database, a step of extracting a record having the corresponding command character string from the resource management database, Indexing and executing the monitoring routine from a resource monitoring library, and a computer-readable recording medium further programmed and recorded. 9. A step of analyzing a request character string issued from a client and a step of performing a database registration for registration or deletion or an operation for deletion in accordance with each of the acceptable methods are programmed and recorded. The computer-readable recording medium according to claim 8.