Package org.apache.activemq.artemis.ra

Class ActiveMQRAMessageConsumer

java.lang.Object
org.apache.activemq.artemis.ra.ActiveMQRAMessageConsumer
All Implemented Interfaces:
MessageConsumer, AutoCloseable
Direct Known Subclasses:
ActiveMQRAQueueReceiver, ActiveMQRATopicSubscriber
public class ActiveMQRAMessageConsumer extends Object implements MessageConsumer
A wrapper for a MessageConsumer.

  • Field Details

  • Constructor Details

  • Method Details

    • close

      public void close() throws JMSException
      Closes the message consumer.

      Since a provider may allocate some resources on behalf of a MessageConsumer 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.

      This call will block until a receive call in progress on this consumer has completed. A blocked receive call returns null when this message consumer is closed.

      If this method is called whilst a message listener is in progress in another thread then it will block until the message listener has completed.

      This method may be called from a message listener's onMessage method on its own consumer. After this method returns the onMessage method will be allowed to complete normally.

      This method is the only MessageConsumer method that can be called concurrently.

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

    • getMessageListener

      public MessageListener getMessageListener() throws JMSException
      Gets the MessageConsumer's MessageListener.

      This method must not be used in a Jakarta EE web or EJB application. Doing so may cause a JMSException to be thrown though this is not guaranteed.

      Specified by:
      getMessageListener in interface MessageConsumer
      Returns:
      the MessageConsumer's MessageListener, or null if one was not set
      Throws:
      JMSException - if the Jakarta Messaging provider fails to get the MessageListener for one of the following reasons:
      • an internal error has occurred or
      • this method has been called in a Jakarta EE web or EJB application (though it is not guaranteed that an exception is thrown in this case)
      See Also:

    • setMessageListener

      public void setMessageListener(MessageListener listener) throws JMSException
      Sets the MessageConsumer's MessageListener.

      Setting the the MessageListener to null is the equivalent of unsetting the MessageListener for the MessageConsumer.

      The effect of calling this method while messages are being consumed by an existing listener or the MessageConsumer is being used to consume messages synchronously is undefined.

      This method must not be used in a Jakarta EE web or EJB application. Doing so may cause a JMSException to be thrown though this is not guaranteed.

      Specified by:
      setMessageListener in interface MessageConsumer
      Parameters:
      listener - the listener to which the messages are to be delivered
      Throws:
      JMSException - if the Jakarta Messaging provider fails to set the MessageConsumer's MessageListener for one of the following reasons:
      • an internal error has occurred or
      • this method has been called in a Jakarta EE web or EJB application (though it is not guaranteed that an exception is thrown in this case)
      See Also:

    • getMessageSelector

      public String getMessageSelector() throws JMSException
      Gets this message consumer's message selector expression.
      Specified by:
      getMessageSelector in interface MessageConsumer
      Returns:
      this message consumer'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 due to some internal error.

    • receive

      public Message receive() throws JMSException
      Receives the next message produced for this message consumer.

      This call blocks indefinitely until a message is produced or until this message consumer is closed.

      If this receive is done within a transaction, the consumer retains the message until the transaction commits.

      Specified by:
      receive in interface MessageConsumer
      Returns:
      the next message produced for this message consumer, or null if this message consumer is concurrently closed
      Throws:
      JMSException - if the Jakarta Messaging provider fails to receive the next message due to some internal error.

    • receive

      public Message receive(long timeout) throws JMSException
      Receives the next message that arrives within the specified timeout interval.

      This call blocks until a message arrives, the timeout expires, or this message consumer is closed. A timeout of zero never expires, and the call blocks indefinitely.

      Specified by:
      receive in interface MessageConsumer
      Parameters:
      timeout - the timeout value (in milliseconds)
      Returns:
      the next message produced for this message consumer, or null if the timeout expires or this message consumer is concurrently closed
      Throws:
      JMSException - if the Jakarta Messaging provider fails to receive the next message due to some internal error.

    • receiveNoWait

      public Message receiveNoWait() throws JMSException
      Receives the next message if one is immediately available.
      Specified by:
      receiveNoWait in interface MessageConsumer
      Returns:
      the next message produced for this message consumer, or null if one is not available
      Throws:
      JMSException - if the Jakarta Messaging provider fails to receive the next message due to some internal error.