Package jakarta.jms

Interface QueueBrowser

All Superinterfaces:
AutoCloseable
public interface QueueBrowser extends AutoCloseable
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 Jakarta Messaging 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 message must not be returned by a QueueBrowser before its delivery time has been reached.

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

Since:
JMS 1.0
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    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.

  • Method Details

    • getQueue

      Queue getQueue() throws JMSException
      Gets the queue associated with this queue browser.
      Returns:
      the queue
      Throws:
      JMSException - if the Jakarta Messaging 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.
      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 Jakarta Messaging 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.
      Returns:
      an enumeration for browsing the messages
      Throws:
      JMSException - if the Jakarta Messaging 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.

      Specified by:
      close in interface AutoCloseable
      Throws:
      JMSException - if the Jakarta Messaging provider fails to close this browser due to some internal error.