Self-configurable distributed system

• US 6,553,405 B1
• Filed: 02/25/2000
• Issued: 04/22/2003
• Est. Priority Date: 02/25/2000
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Desrochers, Stéphane
• Primary Examiner(s): Eng, David Y.
• Application Number:
  US09/513,498
• Time in Patent Office: 1,152 Days
• Field of Search: 709/203, 709/212, 709/217, 709/223
• US Class Current: 709/203
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading

Abstract

A self-configurable distributed computer software system and a method of enabling an applet running on a Web browser in the system to obtain needed software code in the form of Java classes from a machine that is not hosting the applet'"'"'s originating Web server. A Lightweight Directory Access Protocol (LDAP) server stores Java classes utilized by a plurality of applets distributed throughout the system. The applet'"'"'s Web server is connected to the Web browser and to the LDAP server, and includes a servlet for retrieving Java classes from the LDAP server. When the Web browser requests a needed Java class from the Web server, the Web server determines from the package name of the requested Java class whether or not the requested class is stored on the Web server'"'"'s local storage disk. If not, the Web server requests the servlet to retrieve the Java class from the LDAP server. The servlet retrieves the byte code corresponding to the requested Java class, and the Web server provides it to the Web browser. The Web browser then converts the code to a Java class for use by the applet.

Claims

1. A self-configurable distributed computer software system comprising:

a Web browser including;

an applet running on the Web browser, said applet requiring byte code stored outside the Web browser; and

means for requesting the required byte code from a Web server;

a distributed persistent storage mechanism for storing byte code utilized by a plurality of applets distributed throughout the system; and

a Web server having a connection to the Web browser and a connection to the persistent storage mechanism, said Web server including;

a local storage disk for storing byte code;

a servlet for retrieving the byte code from the distributed persistent storage mechanism in response to a request from the Web browser, if the requested byte code is not stored on the local storage disk; and

communication means for sending the retrieved byte code to the Web browser.

2. The self-configurable distributed computer software system of claim 1 wherein the Web server also includes:

means for determining whether the byte code requested by the Web browser is stored on the local storage disk or in the distributed persistent storage mechanism; and

means for retrieving the byte code from the local storage disk upon determining that the byte code requested by the Web browser is stored on the local storage disk.

3. The self-configurable distributed computer software system of claim 2 wherein the means within the Web browser for requesting the required byte code includes means for requesting one or more Java classes.

4. The self-configurable distributed computer software system of claim 3 wherein the distributed persistent storage mechanism is a Lightweight Directory Access Protocol (LDAP) server.

5. The self-configurable distributed computer software system of claim 4 wherein the Web server transfers the byte code retrieved by the servlet to the Web browser, and the Web browser includes means for converting the byte code into Java classes.

6. A self-configurable distributed computer software system having a Web server with a local storage disk for storing byte code, and a Web browser connected to the Web server, said Web browser having an applet and means for requesting and receiving byte code from the Web server for use by the applet, said system comprising:

a distributed persistent storage mechanism for storing byte code utilized by a plurality of applets distributed throughout the system;

means within the Web server for determining whether the byte code requested by the Web browser is stored on the local storage disk; and

a servlet within the Web server for retrieving the byte code from the distributed persistent storage mechanism if the byte code requested by the Web browser is not stored on the local storage disk.

7. The self-configurable distributed computer software system of claim 6 wherein the byte code is stored as Java classes.

8. The self-configurable distributed computer software system of claim 7 wherein the distributed persistent storage mechanism is a Lightweight Directory Access Protocol (LDAP) server.

9. In a self-configurable distributed computer software system, a method of enabling an applet running on a Web browser to obtain needed software code from a distributed persistent storage mechanism outside a machine hosting the applet'"'"'s originating Web server, said method comprising the steps of:

sending a request for the software code from the Web browser to the applet'"'"'s Web server, the Web server having a local storage disk;

determining in the Web server whether the requested software code is stored on the local storage disk;

requesting a servlet in the Web server to obtain the requested software code from the distributed persistent storage mechanism upon determining that the requested software code is not stored on the local storage disk;

sending a request for the software code from the servlet to the distributed persistent storage mechanism;

sending the requested software code from the distributed persistent storage mechanism to the servlet;

providing the requested software code to the Web Server; and

sending the requested software code from the Web server to the Web browser.

10. The method of claim 9 further comprising converting by the Web browser, the retrieved software code into a Java class usable by the applet.

11. The method of claim 10 wherein the step of sending a request for the software code from the servlet to the distributed persistent storage mechanism includes sending the request to a Lightweight Directory Access Protocol (LDAP) server.

12. The method of claim 11 wherein the step of sending the requested software code from the distributed persistent storage mechanism to the servlet includes sending a byte code array from the LDAP server to the servlet.

13. The method of claim 12 wherein the step of providing the requested software code to the Web server includes sending a byte stream from the servlet to the Web server.

14. The method of claim 10 wherein the request for the software code sent from the Web browser to the Web server includes a package name for a Java class, and the step of determining in the Web server whether the requested software code is stored on the local storage disk includes determining whether the requested software code is stored on the local storage disk from the components of the package name.

15. A Web server for providing requested software code to an applet in a Web browser, the Web server comprising:

a connection to the Web browser and a connection to a distributed persistent storage mechanism outside the Web server;

a local storage disk within the Web server for storing software code;

a mechanism within the Web server for determining whether software code requested by the Web browser is stored on the local storage disk; and

a servlet within the Web server that retrieves the requested software code from the distributed persistent storage mechanism and provides the code to the Web server if the software code requested by the applet is not stored on the local storage disk.