String pooling

• US 8,015,168 B2
• Filed: 11/12/2007
• Issued: 09/06/2011
• Est. Priority Date: 11/12/2007
• Status: Active Grant

• Current Assignee: SAP SE
• Original Assignee: SAP AG (SAP SE)
• Inventors: Goetz, Oliver
• Primary Examiner(s): Lu; Kuen
• Assistant Examiner(s): Nguyen; Loan T
• Application Number:
  US11/938,671
• Publication Number:
  US 20090125515A1
• Time in Patent Office: 1,394 Days
• Field of Search: None
• US Class Current: 707/705
• CPC Class Codes: G06F 16/90344 by using string matching techniques

Abstract

A start index and a length are obtained for a subset of a text sequence buffered within a parser. A string pool containing a plurality of pooled string objects is polled to determine whether any of the pooled string objects contain the subset of the text sequence buffered within the parser by using the start index and the length. One of the pooled string objects is used if it contains the subset of the text sequence, otherwise, the generation of a new pooled string object in the string pool containing the subset of the text sequence is initiated. Related techniques, apparatus, systems, and articles are described.

Claims

1. An article comprising non-transitory machine-readable media embodying instructions that when performed by one or more machines result in operations comprising:

obtaining a start index and a length for a subset of a text sequence buffered within a parser;

polling a string pool containing a plurality of pooled string objects to determine whether any of the pooled string objects contain the subset of the text sequence buffered within the parser by using the start index and the length;

using one of the pooled string objects if it contains the subset of the text sequence, otherwise, initiating a generation of a new pooled string object in the string pool containing the subset of the text sequence;

obtaining a second start index and a second length for a second subset of the text sequence buffered within the parser;

polling the string pool containing the plurality of pooled string objects to determine whether any of the pooled string objects contain the second subset of the text sequence buffered within the parser by using the second start index and the second length; and

using one of the pooled string objects if it contains the second subset of the text sequence, otherwise, initiating a generation of a new pooled string object in the string pool containing the second subset of the text sequence.

2. An article as in claim 1, wherein the start index and the length are stored in a data bucket.

3. An article as in claim 2, wherein the data bucket is sequentially reused for a plurality of text sequences buffered within the parser.

4. An article as in claim 1, wherein the data bucket further stores a reference to the buffer of the parser.

5. An article as in claim 1, wherein the data stream comprises at least one eXtensible Markup Language (XML) document.

6. An article as in claim 1, wherein the string pool is managed by a virtual machine.

7. A method comprising:

obtaining a start index and a length for a subset of a text sequence buffered within a parser;

polling a string pool containing a plurality of pooled string objects to determine whether any of the pooled string objects contain the subset of the text sequence buffered within the parser by using the start index and the length;

using one of the pooled string objects if it contains the subset of the text sequence, otherwise, initiating a generation of a new pooled string object in the string pool containing the subset of the text sequence;

obtaining a second start index and a second length for a second subset of the text sequence buffered within the parser;

polling the string pool containing the plurality of pooled string objects to determine whether any of the pooled string objects contain the second subset of the text sequence buffered within the parser by using the second start index and the second length; and

using one of the pooled string objects if it contains the second subset of the text sequence, otherwise, initiating a generation of a new pooled string object in the string pool containing the second subset of the text sequence.

8. A method as in claim 7, wherein the start index and the length are stored in a data bucket.

9. A method as in claim 8, wherein the data bucket is sequentially reused for a plurality of text sequences buffered within the parser.

10. A method as in claim 7, wherein the data bucket further stores a reference to the buffer of the parser.

11. A method as in claim 7, wherein the data stream comprises at least one eXtensible Markup Language (XML) document.

12. A method as in claim 7, wherein the string pool is managed by a virtual machine.

13. A computing system comprising:

a processor;

a memory coupled to the processor;

wherein the memory encodes one or more programs that cause the processor to perform operations comprising;

obtaining a start index and a length for a subset of a text sequence buffered within a parser;

polling a string pool containing a plurality of pooled string objects to determine whether any of the pooled string objects contain the subset of the text sequence buffered within the parser by using the start index and the length;

using one of the pooled string objects if it contains the subset of the text sequence, otherwise, initiating a generation of a new pooled string object in the string pool containing the subset of the text sequence;

obtaining a second start index and a second length for a second subset of the text sequence buffered within the parser;

polling the string pool containing the plurality of pooled string objects to determine whether any of the pooled string objects contain the second subset of the text sequence buffered within the parser by using the second start index and the second length; and

using one of the pooled string objects if it contains the second subset of the text sequence, otherwise, initiating a generation of a new pooled string object in the string pool containing the second subset of the text sequence.

14. A system as in claim 13, wherein the start index and the length are stored in a data bucket.

15. A system as in claim 14, wherein the data bucket is sequentially reused for a plurality of text sequences buffered within the parser.

16. A system as in claim 13, wherein the data bucket further stores a reference to the buffer of the parser.

17. A system as in claim 13, wherein the data stream comprises at least one eXtensible Markup Language (XML) document.

18. A system as in claim 13, wherein the string pool is managed by a virtual machine.