[ 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
-Ddeliverymanager=
SynchronizedDeliveryManager
ConcurrentDeliveryManager
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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