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From "Martin Ritchie (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Resolved: (QPID-21) Add JMS Message Selector Capability
Date Tue, 19 Dec 2006 10:55:21 GMT
     [ http://issues.apache.org/jira/browse/QPID-21?page=all ]

Martin Ritchie resolved QPID-21.

    Resolution: Fixed

Resolved utilising the javacc SelectorParser..jj from the Apache ActiveMQ project.

Selectors are enabled by default but any of the available DeliveryManagers can be enabled
by setting 

ConcurrentSelectorDeliveryManager (Default)

Completed: At revision: 488624  

Performance testing of the broker is still required to determine any speed differentials between
the DeliveryManagers. See QPID-48

> Add JMS Message Selector Capability
> -----------------------------------
>                 Key: QPID-21
>                 URL: http://issues.apache.org/jira/browse/QPID-21
>             Project: Qpid
>          Issue Type: New Feature
>          Components: Java Broker, Java Client
>            Reporter: Marnie McCormack
>         Assigned To: Martin Ritchie
>             Fix For: M2
> Raised this JIRA to document a known gap (required for JMS compliance) and in response
to an end user request. This task may have implications for the AMQP protocol and some investigation
is required on this point before completing implementation work.
> Info below quoted from JMS Specification, section 3.8 (see specification for full details
of JMS selector syntax & refs used below):
> A JMS message selector allows a client to specify, by message header, the messages it's
interested in. Only messages whose headers and properties match the selector are delivered.
The semantics of not delivered differ a bit depending on the MessageConsumer being used. See
Section 5.8,"QueueReceiver," and Section 6.11, "TopicSubscriber," for more details.
> Message selectors cannot reference message body values. A message selector matches a
message if the selector evaluates to true when
> the message's header field and property values are substituted for their corresponding
identifiers in the selector.
> This additional information from the SUN JMS guide:
> A message selector is a String that contains an expression. The syntax of the expression
is based on a subset of the SQL92 conditional expression syntax. The message selector in the
example selects any message that has a NewsType property that is set to the value 'Sports'
or 'Opinion': 
> NewsType = 'Sports' OR NewsType = 'Opinion' 
> The createConsumer and createDurableSubscriber methods allow you to specify a message
selector as an argument when you create a message consumer. 
> The message consumer then receives only messages whose headers and properties match the
selector. (See Message Headers, and Message Properties.) A message selector cannot select
messages on the basis of the content of the message body. 

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