QUEUE MESSAGE RETRIEVAL BY SELECTION CRITERIA

• US 20100228766A1
• Filed: 05/29/2009
• Published: 09/09/2010
• Est. Priority Date: 02/23/2009
• Status: Active Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Dixon, Bret W.
• Application Number:
  US12/474,497
• Publication Number:
  US 20100228766A1
• Time in Patent Office: Days
• US Class Current: 707/769
• CPC Class Codes: G06F 16/24568 Data stream processing; Continuous queries
• CPC Class Codes: G06F 2209/548 Queue
• CPC Class Codes: G06F 9/546 Message passing systems or structures, e.g. queues

Abstract

Embodiments of the present invention address deficiencies of the art in respect to message queuing and provide a method, system and computer program product for message queue retrieval by selection criteria. In an embodiment of the invention, a method for message queue retrieval by selection criteria can include receiving from a requesting application a message retrieval request for a message in a message queue storing different messages and determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages. The method also can include applying the selection criteria to the messages in the message queue to select a message or subset of the messages in the message queue, and transmitting the message or subset to the requesting application.

Claims

1. A method for message queue retrieval by selection criteria comprising:

receiving from a requesting application a message retrieval request for a message in a message queue storing a plurality of messages;

determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages;

applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue; and

,

transmitting the message subset to the requesting application.

2. The method of claim 1, wherein determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages, comprises:

identifying from the message retrieval request a specified template;

loading the specified template in memory;

mapping portions of the messages to the fields in the template; and

,

extracting selection criteria from the message retrieval request operable upon the mapped portions of the mapped content.

3. The method of claim 1, wherein determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages, comprises:

identifying from the message retrieval request a specified template included as part of the request;

loading the specified template in memory;

mapping portions of the messages to the fields in the template; and

,

extracting selection criteria from the message retrieval request operable upon the mapped portions of the mapped content.

4. The method of claim 1, wherein applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

comparing a value of content in a field specified by the selection criteria in each of the messages to a fixed value specified by the selection criteria; and

,

selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria matching the fixed value specified by the selection criteria.

5. The method of claim 1, wherein applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

comparing a value of content in a field specified by the selection criteria in each of the messages to a range of values specified by the selection criteria; and

,

selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria matching a value falling amongst the range of values specified by the selection criteria.

6. The method of claim 1, wherein applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

comparing a value of content in a first field specified by the selection criteria in each of the messages to a value of content in a second field specified by the selection criteria; and

,

selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the first field specified by the selection criteria matching the value of the second field specified by the selection criteria.

7. The method of claim 1, wherein applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

comparing a value of content in a field specified by the selection criteria in each of the messages to a fixed value specified by the selection criteria; and

,

selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria not matching the fixed value specified by the selection criteria.

8. The method of claim 1, wherein applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

comparing a value of content in a field specified by the selection criteria in each of the messages to a range of values specified by the selection criteria; and

,

selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria not matching a value falling within the range of values specified by the selection criteria.

9. A message queuing data processing system comprising:

a host computing system comprising a processor and memory;

a message queue coupled to the host computing system; and

,

a message retrieval module executing in the host computing system, the module comprising program code enabled to receive from a requesting application a message retrieval request for a message in a message queue storing a plurality of messages, to determine from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages, to apply the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, and to transmit the message subset to the requesting application.

10. A computer program product comprising a computer usable medium embodying computer usable program code for message queue retrieval by selection criteria, the computer program product comprising:

computer usable program code for receiving from a requesting application a message retrieval request for a message in a message queue storing a plurality of messages;

computer usable program code for determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages;

computer usable program code for applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue; and

,

computer usable program code for transmitting the message subset to the requesting application.

11. The computer program product of claim 10, wherein the computer usable program code for determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages, comprises:

computer usable program code for identifying from the message retrieval request a specified template;

computer usable program code for loading the specified template in memory;

computer usable program code for mapping portions of the messages to the fields in the template; and

,

computer usable program code for extracting selection criteria from the message retrieval request operable upon the mapped portions of the mapped content.

12. The computer program product of claim 10, wherein the computer usable program code for determining from the message retrieval request both a template defining fields in the messages, and also selection criteria operable upon content stored in at least one of the fields in the messages, comprises:

computer usable program code for identifying from the message retrieval request a specified template included as part of the request;

computer usable program code for loading the specified template in memory;

computer usable program code for mapping portions of the messages to the fields in the template; and

,

computer usable program code for extracting selection criteria from the message retrieval request operable upon the mapped portions of the mapped content.

13. The computer program product of claim 10, wherein the computer usable program code for applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

computer usable program code for comparing a value of content in a field specified by the selection criteria in each of the messages to a fixed value specified by the selection criteria; and

,

computer usable program code for selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria matching the fixed value specified by the selection criteria.

14. The computer program product of claim 10, wherein the computer usable program code for applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

computer usable program code for comparing a value of content in a field specified by the selection criteria in each of the messages to a range of values specified by the selection criteria; and

,

computer usable program code for selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria matching a value falling amongst the range of values specified by the selection criteria.

15. The computer program product of claim 10, wherein the computer usable program code for applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

computer usable program code for comparing a value of content in a first field specified by the selection criteria in each of the messages to a value of content in a second field specified by the selection criteria; and

,

computer usable program code for selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the first field specified by the selection criteria matching the value of the second field specified by the selection criteria.

16. The computer program product of claim 10, wherein the computer usable program code for applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

computer usable program code for comparing a value of content in a field specified by the selection criteria in each of the messages to a fixed value specified by the selection criteria; and

,

computer usable program code for selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria not matching the fixed value specified by the selection criteria.

17. The computer program product of claim 10, wherein the computer usable program code for applying the selection criteria to the messages in the message queue to select a message subset of the messages in the message queue, comprises:

computer usable program code for comparing a value of content in a field specified by the selection criteria in each of the messages to a range of values specified by the selection criteria; and

,

computer usable program code for selecting messages in the message queue for inclusion in the message subset, each of the selected messages in the message subset comprising a value of content in the field specified by the selection criteria not matching a value falling within the range of values specified by the selection criteria.