Document structures for delta handling in server pages

• US 7,434,163 B2
• Filed: 05/31/2002
• Issued: 10/07/2008
• Est. Priority Date: 05/31/2002
• Status: Expired due to Term

• Current Assignee: SAP SE
• Original Assignee: SAP AG (SAP SE)
• Inventors: McKellar, Brian, Goerke, Bjorn
• Primary Examiner(s): Hutton; Doug
• Assistant Examiner(s): Tran; Quoc A.
• Application Number:
  US10/159,819
• Publication Number:
  US 20030226106A1
• Time in Patent Office: 2,321 Days
• Field of Search: 715/513, 715/514, 707/1, 709/214
• US Class Current: 715/234
• CPC Class Codes: G06F 16/9574 of access to content, e.g. by caching

Abstract

Methods, systems and apparatus, including computer program products, for delta handling in server pages. A server method, for processing a page document that has multiple page components, includes generating, for each page component of the page document, a corresponding browser component. The method also includes building a document structure of a browser document corresponding to the page document. The document structure includes a page buffer and the generated browser components. The page buffer and the browser components have relationships that reflect the structure of the browser document. The method can identify a browser delta in the document structure and send the browser delta to an output stream.

Claims

1. A server method for processing a page document that comprises a plurality of page components, the method comprising:

generating a browser document from the page document, wherein generating the browser document from the page document includes;

generating for each page component of the page document a corresponding browser component, each browser component being in a browser compliant syntax; and

building a document structure of the browser document from the page document, wherein

the browser document corresponds to the page document,

the document structure comprises a page buffer content and the generated browser components, the page buffer content being in a browser compliant syntax, the page buffer content corresponding to content of the page document, and

the page buffer content and the browser components have relationships that reflect the structure of the browser document;

sending the browser document to a client;

identifying at least one browser delta in the document structure including

retrieving information relating to a first component of the browser document in the browser compliant syntax,

retrieving a second component in the browser compliant syntax, and

comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax;

sending the at least one browser delta to an output stream; and

sending the output stream to an invisible first frame in response to a client request for a response directed to the first frame, wherein the client injects the browser delta into a document object model of the browser document displayed in a second visible frame.

2. The server method of claim 1, wherein the page document is a JSP, BSP, ADP, or ASP page.

3. The server method of claim 1, wherein each page component is represented by a tag within the page document.

4. The server method of claim 1, wherein:

the page buffer content includes a copy of each of the browser components.

5. The server method of claim 1, wherein:

one or more of the browser components is a child node in the document structure; and

the page buffer content includes a representation of each of the child node browser components.

6. A client method for using an output stream received from a server, the method comprising:

receiving the output stream from the server, wherein;

the output stream comprises a document structure of a browser document,

the browser document corresponds to a page document on the server and the document structure of the browser document is generated from the page document,

the document structure comprises a page buffer content and a plurality of browser components, each browser component being in a browser compliant syntax, the page buffer content being in a browser compliant syntax, the page buffer content corresponding to content of the page document, and

the page buffer content and the browser components have relationships that reflect the structure of the browser document;

building from the output stream a document object model of the browser document;

requesting a server response from the server, the server response including a browser delta and being directed to a first invisible frame, where the browser delta is identified at the server by retrieving information relating to a first component of the browser document in the browser compliant syntax, retrieving a second component in the browser compliant syntax, and comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax;

receiving a browser delta from the server in the first invisible frame; and

updating the document object model by injecting the browser delta into the document object model of the browser document displayed in a second visible frame.

7. The client method of claim 6, wherein:

the page buffer content includes a copy of each of the browser components.

8. The client method of claim 6, wherein:

one or more of the browser components is a child node in the document structure and the page buffer content includes a representation of each of the child node browser components.

9. A computer program product, tangibly embodied in a machine-readable storage device, for processing a page document that comprises a plurality of page components, the product comprising instructions operable to cause a server computer to:

generate a browser document from the page document, wherein to generate the browser document from the page document includes to;

generate for each page component a corresponding browser component, each browser component being in a browser compliant syntax; and

build a document structure of the browser document from the page document, wherein

the browser document corresponds to the page document,

the document structure comprises a page buffer content and the generated browser components, the page buffer content being in a browser-compliant syntax, the page buffer content corresponding to content of the page document, and

the page buffer content and the browser components have relationships that reflect the structure of the browser document;

send the browser document to a client;

identify at least one browser delta in the document structure including;

retrieving information relating to a first component of the browser document in the browser compliant syntax,

retrieving a second component in the browser compliant syntax, and

comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax;

send the at least one browser delta to an output stream; and

send the output stream to an invisible first frame in response to a client request for a response directed to the first frame, wherein the client injects the browser delta into a document object model of the browser document displayed in a second visible frame.

10. The computer program product of claim 9, wherein:

the page buffer content includes a copy of each of the browser components.

11. The computer program product of claim 9, wherein:

one or more of the browser components is a child node in the document structure; and

the page buffer content includes a representation of each of the child node browser components.

12. A computer program product, tangibly embodied in a machine-readable storage device, for using an output stream received from a server, the product comprising instructions operable to cause a client computer to:

receive the output stream from the server, wherein

the output stream comprises a document structure of a browser document,

the browser document corresponds to a page document on the server and the document structure of the browser document is generated from the page document,

the document structure comprises a page buffer content and a plurality of browser components, each browser component being in a browser-compliant syntax, the page buffer content being in a browser-compliant syntax, the page buffer content corresponding to content of the page document, and

the page buffer content and the browser components have relationships that reflect the structure of the browser document;

build from the output stream a document object model of the browser document;

request a server response from the server, the server response including a browser delta, and being directed to a first invisible frame, where the browser delta is identified at the server by retrieving information relating to a first component of the browser document in the browser compliant syntax, retrieving a second component in the browser compliant syntax, and comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax;

receive a browser delta from the server in the first invisible frame; and

update the document object model by injecting the browser delta into the document object model of the browser document displayed in a second visible frame.

13. The computer program product of claim 12, wherein:

the page buffer content includes a copy of each of the browser components.

14. The computer program product of claim 12, wherein:

one or more of the browser components is a child node in the document structure; and

the page buffer content includes a representation of each of the child node browser components.

17. The data structure of claim 13, wherein:

one or more of the browser components is a child node in the document structure; and

the page buffer content includes a representation of each of the child node browser components.

15. An output created on a server for a client, comprising:

a first data structure created as an output stream on the server for the client, the first data stream comprising a page buffer content and a plurality of browser components, wherein the page buffer content is the root node of a document structure, each browser component is in a browser-compliant syntax, the page buffer content is in a browser-compliant syntax, the page buffer content corresponds to content of a page document, and the page buffer and the browser components have relationships that reflect the structure of a browser document represented by the data structure, the document structure being generated from the page document on the server;

a second data structure created as an output stream on the server for the client, the second data structure comprising a browser delta the browser delta being identified by retrieving information relating to a first component of the browser document in the browser compliant syntax, retrieving a second component in the browser compliant syntax, and comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax.

16. The data structure of claim 15, wherein:

the page buffer content includes a copy of each of the browser components.

18. A server for providing an output stream to enable delta-handling in server pages, the server comprising:

a memory for storing a page document that comprises a plurality of page components; and

a processor coupled to a program storage device storing instructions operable to cause the processor to;

generate a browser document from the page document, wherein to generate the browser document from the page document includes to;

generate for each page component a corresponding browser component, each browser component being in a browser-compliant syntax, and

build a document structure of the browser document from the page document, wherein;

the browser document corresponds to the page document,

the document structure comprises a page buffer content and each generated browser component, the page buffer content being in a browser-compliant syntax, the page buffer content corresponding to content of the page document, and

the page buffer content and the browser components have relationships that reflect the structure of the browser document;

send the browser document to a client;

identify at least one browser delta in the document structure including;

retrieving information relating to a first component of the browser document in the browser compliant syntax,

retrieving a second component in the browser compliant syntax, and

comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax;

send the at least one browser delta to the output stream; and

send the output stream to an invisible first frame in response to a client request for a response directed to the first frame,

wherein the client injects the browser delta into a Document Object Model (DOM) of the browser document displayed in a second visible frame.

19. The server of claim 18, wherein:

the page buffer content includes a copy of each of the browser components.

20. The server of claim 18, wherein:

one or more of the browser components is a child node in the document structure; and

the page buffer content includes a representation of each of the child node browser components.

21. A client for using an output stream from a server, the client comprising:

a memory configured to receive the output stream from the server, wherein

the output stream comprises a document structure of a browser document,

the browser document corresponds to a page document on the server and the document structure of the browser document is generated from the page document,

the document structure comprises a page buffer content and a plurality of browser components, each browser component being in a browser-compliant syntax, the page buffer content being in a browser-compliant syntax, the page buffer content corresponding to content of the page document, and

the page buffer content and the browser components have relationships that reflect the structure of the browser document; and

a processor coupled to a program storage device storing instructions operable to cause the processor to

build from the output stream a document object model of the browser document,

request a server response from the server directed to a first invisible frame, the server response including a browser delta, where the browser delta is identified at the server by retrieving information relating to a first component of the browser document in the browser compliant syntax, retrieving a second component in the browser compliant syntax, and comparing the first component with the second component to identify at least one browser delta in the document, the browser delta being in the browser compliant syntax,

receive a browser delta from the server in the first invisible frame, and

update the document object model by injecting the browser delta into the document object model of the browser document displayed in a second visible frame.

22. The client of claim 21, wherein:

the page buffer content includes a copy of each of the browser components.

23. The client of claim 21, wherein:

one or more of the browser components is a child node in the document structure; and

the page buffer content includes a representation of each of the child node browser components.