Web application execution method

• US 7,966,367 B2
• Filed: 04/20/2009
• Issued: 06/21/2011
• Est. Priority Date: 12/29/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Hsueh, Hsiang-Yuan, Lin, Yi-Bin, Shi, Jun-Bin
• Primary Examiner(s): NEURAUTER, GEORGE C
• Application Number:
  US12/426,670
• Publication Number:
  US 20100169407A1
• Time in Patent Office: 792 Days
• Field of Search: 709/203, 709/224
• US Class Current: 709/203
• CPC Class Codes: G06F 2209/541 Client-server
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores
• CPC Class Codes: G06F 9/54 Interprogram communication

Abstract

A web application execution method, for a client to execute a web application on a remote server is provided. A connection status between the client and the remote server is monitored. If the connection is established, an online learning process is performed to monitor the handshakes between the client and the server, thereby constructing a virtual server. If the connection is disconnected, an offline service is activated, allowing the client to execute the web application through the virtual server. If the connection is reestablished after being disconnected, a synchronization process is performed to synchronize state machines within the virtual server and the server.

Claims

1. A web application execution method, adaptable for a client to execute a web application on a remote server, comprising:

observing a connection status between the client and the remote server;

when the connection status is online, processing an online learning process to monitor communication sessions between the client and the remote server to establish a virtual server for providing an offline service;

when the connection status is offline, diverting the client to the virtual server to access the offline service, such that the web application is executed without disruption; and

when the connection status is reestablished from an offline connection status, processing a synchronization process to synchronize execution states of the web application from the virtual server to the remote server,

wherein the online learning process comprises;

recording a request initiated by the client, and a response generated by the remote server in response to the request;

analyzing the request to obtain one or more request parameters;

analyzing the response to obtain a header section and a body section, wherein the header section comprises one or more response parameters, and the body section comprises one or more web resources, structural information and web documents;

establishing a resource mapping database, for recording relationships between the request parameters, the response parameters and the body sections;

establishing a resource bank for storage of the web resources, the structural information and the web documents;

analyzing relationships between multiple requests initiated by the client and relationships between multiple responses generated by the remote server to establish a state machine; and

establishing the virtual server based on the resource mapping database, the resource bank, and the state machine.

2. The web application execution method as claimed in claim 1, wherein the online learning process further comprises:

when a response generated by the remote server comprises a declaration file defining offline web sources that are essential for offline operations, updating the resource mapping database and the resource bank by the offline web sources defined by the declaration file.

3. The web application execution method as claimed in claim 1, wherein the offline service comprises:

diverting a request initiated by the client to the virtual server;

the virtual server analyzing the request to obtain one or more request parameters;

looking up the resource mapping database based on the request parameters, to obtain one or more response parameters, web resources, structural information, and web documents from the resource bank corresponding to the request parameters;

constructing a virtual response from the one or more response parameters, web resources, structural information, and web documents corresponding to the request parameters; and

transmitting the virtual response to the client in response to the request.

4. The web application execution method as claimed in claim 3, wherein the offline service further comprises, inserting an HTTP entity tag (Etag) in the header section of the virtual response to indicate that the virtual response does not need an update.

5. The web application execution method as claimed in claim 3, wherein the offline service further comprises, when looking up of the resource mapping database fails to obtain any information corresponding to the request parameters, sending a link failure message to the client.

6. The web application execution method as claimed in claim 3, wherein the offline service further comprises, when a request diverted to the virtual server comprises uploaded data, providing an upload queue to buffer the request and the uploaded data.

7. The web application execution method as claimed in claim 6, further comprising:

when the connection status is online, but a request initiated by the client meets a criterion for offline execution, diverting the client to the virtual server to process the offline service.

8. The web application execution method as claimed in claim 7, wherein the synchronization process comprises, the virtual server transmitting one or more requests received when offline to the remote server based on the state machine, such that the execution states of the web application is consistent with the remote server.

9. The web application execution method as claimed in claim 8, wherein the synchronization process further comprises, transmitting the requests and uploaded data buffered in the upload queue to the remote server.

10. The web application method as claimed in claim 1, wherein the virtual server is a software program installed in the client.