QueueBrowser (Java EE 5 SDK)

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Java EE 5 SDK

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javax.jms Interface QueueBrowser

public interface QueueBrowser

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

The getEnumeration method returns a java.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.

A QueueBrowser can be created from either a Session or a QueueSession.

版本:: 1.1 April 9, 2002
作者:: Mark Hapner, Rich Burridge, Kate Stout
另请参见:: Session.createBrowser(javax.jms.Queue), QueueSession.createBrowser(javax.jms.Queue), QueueReceiver

方法摘要
`void`	`close()` Closes the `QueueBrowser`.
`Enumeration`	`getEnumeration()` Gets an enumeration for browsing the current queue messages in the order they would be received.
`String`	`getMessageSelector()` Gets this queue browser's message selector expression.
`Queue`	`getQueue()` Gets the queue associated with this queue browser.

方法详细信息

getQueue

Queue getQueue()
               throws JMSException

Gets the queue associated with this queue browser.

返回:: the queue
抛出异常:: JMSException - if the JMS provider fails to get the queue associated with this browser due to some internal error.

getMessageSelector

String getMessageSelector()
                          throws JMSException

Gets this queue browser's message selector expression.

返回:: 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)
抛出异常:: JMSException - if the JMS provider fails to get the message selector for this browser due to some internal error.

getEnumeration

Enumeration getEnumeration()
                           throws JMSException

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

返回:: an enumeration for browsing the messages
抛出异常:: JMSException - if the JMS provider fails to get the enumeration for this browser due to some internal error.

close

void close()
           throws JMSException

Closes the QueueBrowser.

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.

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

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