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Interface QueueBrowser

public interfaceQueueBrowser

A client uses aQueueBrowser object to look at messages on a queue without removing them.

ThegetEnumeration method returns ajava.util.Enumeration that is used to scan the queue's messages. It may be an enumeration of the entire content of a queue, or it may contain only the messages matching a message selector.

Messages may be arriving and expiring while the scan is done. The JMS API does not require the content of an enumeration to be a static snapshot of queue content. Whether these changes are visible or not depends on the JMS provider.

See Also:

QueueSession.createBrowser(Queue),QueueSession.createBrowser(Queue, String),QueueReceiver

getQueue

publicQueuegetQueue()               throwsJMSException

Gets the queue associated with this queue browser.

Returns:

the queue

Throws:

JMSException - if the JMS provider fails to get the queue associated with this browser due to some internal error.

getMessageSelector

public java.lang.StringgetMessageSelector()                                    throwsJMSException

Gets this queue browser's message selector expression.

Returns:

this queue browser's message selector, or null if no message selector exists for the message consumer (that is, if the message selector was not set or was set to null or the empty string)

Throws:

JMSException - if the JMS provider fails to get the message selector for this browser due to some internal error.

getEnumeration

public java.util.EnumerationgetEnumeration()                                     throwsJMSException

Gets an enumeration for browsing the current queue messages in the order they would be received.

Returns:

an enumeration for browsing the messages

Throws:

JMSException - if the JMS provider fails to get the enumeration for this browser due to some internal error.

close

public voidclose()           throwsJMSException

Closes theQueueBrowser.

Since a provider may allocate some resources on behalf of a QueueBrowser outside the Java virtual machine, clients should close them when they are not needed. Relying on garbage collection to eventually reclaim these resources may not be timely enough.

Throws:

JMSException - if the JMS provider fails to close this browser due to some internal error.