Delta handling in server pages

• US 7,444,585 B2
• Filed: 05/31/2002
• Issued: 10/28/2008
• Est. Priority Date: 04/19/2002
• Status: Expired due to Fees

• 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:
  US10/159,817
• Publication Number:
  US 20030225826A1
• Time in Patent Office: 2,342 Days
• Field of Search: 715/513, 715234-240, 709/203, 709/219, 709/201, 709/312, 707/200, 707/10, 707/523, 370/254
• 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. A server has a page document with multiple page components. The server allocates a component buffer to each page component and writes a corresponding browser component into each allocated component buffer. In one aspect, the server identifies at least one browser delta in at least one identified component buffer and sends the browser delta to a client.

Claims

1. A server method for processing a server-side page document, the page document comprising 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 from 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 is in a browser compliant syntax, the page buffer content corresponds 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;

allocating a distinct component buffer to each page component of the plurality of page components of the page document and allocating a page buffer to the page document;

writing a corresponding browser component into each distinct allocated component buffer, each browser component corresponding to the page component to which the respective component buffer was allocated, each browser component being a component of a browser document corresponding to the page document, the browser document being the page in a form suitable for processing and display by a client;

building a buffer hierarchy of the allocated component buffers, the buffer hierarchy having a root node, wherein the page buffer is the root node of the buffer hierarchy and is a parent node of at least one component buffer, wherein each component buffer can be a parent node of further component buffers, the buffer hierarchy comprising a first parent node component buffer that is a parent of a first child node component buffer;

using a representation of the browser component in the first child node component buffer in representing the browser component in the first parent node component buffer; and

sending the page buffer and each component buffer of the buffer hierarchy to a client.

2. The server method of claim 1 further comprising:

detecting a change in at least one identified component buffer; and

transmitting information indicating the change to the client without transmitting the entire browser document to the client.

3. The server of method of claim 2, wherein:

detecting a change comprises identifying at least one browser delta in the at least one identified component buffer; and

transmitting information indicating the change comprises sending the at least one browser delta to the client.

4. The sewer method of claim 3, wherein the at least one browser delta is represented in a browser-compliant language selected from the group of HTML, XML, XHTML, WML, JavaScript and Visual Basic Script.

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

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

7. The server method of claim 1, wherein each component buffer is stored in a memory stack.

8. A client method for receiving a page document, the page document comprising a plurality of page components, the method comprising:

receiving a page buffer and a buffer hierarchy of component buffers, wherein;

the page buffer and the buffer hierarchy represent a browser document that corresponds to a page document stored on a server and include a plurality of browser components, each browser component referring to a corresponding page component of the page document, where the browser document is generated from the page document, and 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 is in a browser compliant syntax, the page buffer content corresponds 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;

the buffer hierarchy includes a distinct component buffer for each of the plurality of browser components, wherein each browser component is written into the corresponding component buffer, and

the buffer hierarchy has a root node, wherein the page buffer is the root node of the buffer hierarchy and is a parent node of at least one component buffer, wherein each component buffer can be a parent node of further component buffers, the buffer hierarchy comprising a first parent node component buffer that is a parent of a first child node component buffer, the first parent node component buffer including a representation of the browser component in the first child node component buffer, the representation requiring less memory than is required by the browser component in the first child node component buffer;

displaying the browser document based on the page buffer and the buffer hierarchy;

receiving change information that refers to a specific browser component and specifies a change to the specific browser component; and

updating the browser document in accordance with the change information.

9. The method of claim 8, wherein:

receiving change information comprises receiving a browser delta from the server, wherein the browser delta refers to a specific browser component and is identified by the server by a component buffer being allocated to the corresponding page component; and

updating the browser document with the browser delta.

10. The client method of claim 9, wherein updating the browser document comprises:

injecting the browser delta into a document object model of the browser document.

11. The client method of claim 9, wherein the browser delta is received by a first frame and updating the browser document comprises updating the browser document with the browser delta in a second frame.

12. The client method of claim 11, wherein the first frame is invisible.

13. The client method of claim 11, further comprising:

receiving a new browser document in the first frame;

reducing the size of the second frame; and

expanding the size of the first frame.

14. The client method of claim 13, wherein the second frame is invisible.

15. A server capable of processing a page document, the page document comprising a plurality of page components, the server comprising:

a memory storing a server-side page document that includes a plurality of page components, the memory providing a page buffer and a plurality of component buffers; and

a processor executing instructions to;

generate a browser document from the page document, wherein instructions to generate the browser document from the page document include instructions to;

generate from each page component of the page document 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 is in a browser compliant syntax, the page buffer content corresponds 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;

allocate a distinct component buffer to each page component of the plurality of page components of the page document;

allocate the page buffer to the page document;

write a corresponding browser component into each distinct allocated component buffer, each browser component corresponding to the page component to which the respective component buffer was allocated, each browser component being a component of a browser document corresponding to the page document, the browser document being the page in a form suitable for processing and display by a client;

build a buffer hierarchy of the allocated component buffers, the buffer hierarchy having a root node, wherein the page buffer is the root node of the buffer hierarchy and is a parent node of at least one component buffer, wherein each component buffer can be a parent node of further component buffers, the buffer hierarchy comprising a first parent node component buffer that is a parent of a first child node component buffer;

use a representation of the browser component in the first child node component buffer in representing the browser component in the first parent node component buffer; and

send the page buffer and each component buffer of the buffer hierarchy to a client.

16. The server of claim 15, wherein the processor executes further instructions to detect a change in at least one identified component buffer and to transmit information indicating the change to the client without transmitting the entire browser document to the client.

17. The server of claim 16, wherein the further instructions comprise instructions to identify at least one browser delta in at least one identified component buffer and to send the at least one browser delta to a client.

18. The server of claim 15, wherein each component buffer is stored in a stack of the memory.

19. A client capable of receiving a page document, the page document comprising a plurality of page components, the client comprising:

a memory; and

a processor, the processor executing instructions to;

receive a page buffer and a buffer hierarchy of component buffers and store the page buffer and the buffer hierarchy in the memory, wherein;

the page buffer and the buffer hierarchy represent a browser document that corresponds to a page document stored on a server and include a plurality of browser components, each browser component referring to a corresponding page component of the page document, where the browser document is generated from the page document, and wherein generating the browser document from the page document includes instructions to;

generate from each page component of the page document 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 is in a browser compliant syntax, the page buffer content corresponds 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;

the buffer hierarchy includes a distinct component buffer for each of the plurality of browser components, wherein each browser component is written into the corresponding component buffer, and

the buffer hierarchy has a root node, wherein the page buffer is the root node of the buffer hierarchy and is a parent node of at least one component buffer, wherein each component buffer can be a parent node of further component buffers, the buffer hierarchy comprising a first parent node component buffer that is a parent of a first child node component buffer, the first parent node component buffer including a representation of the browser component in the first child node component buffer;

display the browser document based on the page buffer and the buffer hierarchy;

receive change information that refers to a specific browser component and specifies a change to the specific browser component; and

update the browser document in accordance with the change information.

20. The client of claim 19, wherein:

instructions to receive change information further comprises instructions to receive a browser delta from the server, wherein the browser delta refers to a specific browser component and is identified by the server by a distinct component buffer being allocated to the corresponding page component; and

the instructions to update the browser document further comprise instructions to update the browser document with the browser delta.

21. The client of claim 20, wherein for updating the processor executes instructions to inject the browser delta into a document object model of the browser document.

22. The client of claim 20, wherein the memory provides a first frame to receive the browser delta and the processor executes instructions to update the browser document with the browser delta in a second frame provided by the memory.

23. The client of claim 22, wherein the first frame receives a new browser document and the processor executes instructions to reduce the size of the second frame and to expand the size of the first frame.

24. A computer program product, tangibly embodied on a computer readable medium, for processing a page document on a server, the page document comprising a plurality of components, the computer program product comprising instructions operable to cause a server computer to:

generate a browser document from the page document, wherein instructions to generate the browser document from the page document include instructions to;

generate from each page component of the page document 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 is in a browser compliant syntax, the page buffer content corresponds 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;

allocate a distinct component buffer to each page component of the plurality of page components of the page document and to allocate a page buffer to the page document;

write a corresponding browser component into each distinct allocated component buffer, each browser component corresponding to the page component to which the respective component buffer was allocated, each browser component being a component of a browser document corresponding to the page document, the browser document being the page in a form suitable for processing and display by a client;

build a buffer hierarchy of the allocated component buffers, the buffer hierarchy having a root node, wherein the page buffer is the root node of the buffer hierarchy and is a parent node of at least one component buffer, wherein each component buffer can be a parent node of further component buffers, the buffer hierarchy comprising a first parent node component buffer that is a parent of a first child node component buffer;

use a representation of the browser component in the first child node component buffer in representing the browser component in the first parent node component buffer; and

send the page buffer and each component buffer of the buffer hierarchy to a client.

25. The computer program product of claim 24 further comprising instructions operable to cause the server computer to:

detect a change in at least one identified component buffer; and

transmit information indicating the change to the client without transmitting the entire browser document to the client.

26. The computer program product of claim 25, wherein:

the instructions to detect a change comprise instructions to identify at least one browser delta in the at least one identified component buffer; and

the instructions to transmit information comprise instructions to send the at least one browser delta to the client.

27. The computer program product of claim 26 wherein the at least one browser delta is in a browser compliant language selected from the group of HTML, XML, XHTML, WML, JavaScript and Visual Basic Script.

28. The computer program product of claim 24, wherein the page document is a JSP, BSP, ADP or ASP page.

29. The computer program product of claim 24, wherein each page component is represented by a tag within the page document.

30. The computer program product of claim 24, wherein each component buffer is stored in a memory stack.

31. A computer program product, tangibly embodied on a computer readable medium, for receiving a page document on a client, the page document comprising a plurality of components, the computer program product comprising instructions operable to cause the client to:

receive a page buffer and a buffer hierarchy of component buffers and store the page buffer and the buffer hierarchy in the memory, wherein;

the page buffer and the buffer hierarchy represent a browser document that corresponds to a page document stored on a server and include a plurality of browser components, each browser component referring to a corresponding page component of the page document, where the browser document is generated from the page document, and wherein generating the browser document from the page document includes instructions to;

generate from each page component of the page document 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 is in a browser compliant syntax, the page buffer content corresponds 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;

the buffer hierarchy includes a distinct component buffer for each of the plurality of browser components, wherein each browser component is written into the corresponding component buffer, and

the buffer hierarchy has a root node, wherein the page buffer is the root node of the buffer hierarchy and is a parent node of at least one component buffer, wherein each component buffer can be a parent node of further component buffers, the buffer hierarchy comprising a first parent node component buffer that is a parent of a first child node component buffer, the first parent node component buffer including a representation of the browser component in the first child node component buffer;

display the browser document based on the page buffer and the buffer hierarchy;

receive change information that refers to a specific browser component and specifies a change to the specific browser component; and

update the browser document in accordance with the change information.

32. The computer program product of claim 31, wherein:

the instructions operable to cause the client to receive change information further comprise instructions to receive a browser delta from the server, wherein the browser delta refers to a specific browser component and is identified by the server via a distinct component buffer being allocated to the corresponding page component; and

the instructions operable to cause the client to update the browser document further comprise instructions to update the browser document with the browser delta.

33. The computer program product of claim 32, wherein the instructions operable to cause the client to update the browser document comprise instructions operable to cause the client to:

inject the browser delta into a document object model of the browser document.

34. The computer program product of claim 32, wherein the instructions operable to cause the client to receive the browser delta comprise instructions operable to cause the client to receive the browser delta in a first frame and the instructions operable to cause the client to update the browser document comprise instructions operable to cause the client to update the browser document with the browser delta in a second frame.

35. The computer program product of claim 34, wherein the first frame is invisible.

36. The computer program product of claim 34, further comprising instructions operable to cause the client to:

receive a new browser document in the first frame;

reduce the size of the second frame; and

expand the size of the first frame.

37. The computer program product of claim 36, wherein the second frame is invisible.