Package org.apache.activemq

Class ActiveMQTopicPublisher

  • All Implemented Interfaces:
    MessageProducer, TopicPublisher, Closeable, Disposable, StatsCapable
    public class ActiveMQTopicPublisher
extends ActiveMQMessageProducer
implements TopicPublisher
    A client uses a TopicPublisher object to publish messages on a topic. A TopicPublisher object is the publish-subscribe form of a message producer.

    Normally, the Topic is specified when a TopicPublisher is created. In this case, an attempt to use the publish methods for an unidentified TopicPublisher will throw a java.lang.UnsupportedOperationException.

    If the TopicPublisher is created with an unidentified Topic, an attempt to use the publish methods that assume that the Topic has been identified will throw a java.lang.UnsupportedOperationException.

    During the execution of its publish method, a message must not be changed by other threads within the client. If the message is modified, the result of the publish is undefined.

    After publishing a message, a client may retain and modify it without affecting the message that has been published. The same message object may be published multiple times.

    The following message headers are set as part of publishing a message: JMSDestination,JMSDeliveryMode,JMSExpiration, JMSPriority,JMSMessageID and JMSTimeStamp. When the message is published, the values of these headers are ignored. After completion of the publish, the headers hold the values specified by the method publishing the message. It is possible for the publish method not to set JMSMessageID and JMSTimeStamp if the setting of these headers is explicitly disabled by the MessageProducer.setDisableMessageID or MessageProducer.setDisableMessageTimestamp method.

    Creating a MessageProducer provides the same features as creating a TopicPublisher. A MessageProducer object is recommended when creating new code. The TopicPublisher is provided to support existing code.

    Because TopicPublisher inherits from MessageProducer , it inherits the send methods that are a part of the MessageProducer interface. Using the send methods will have the same effect as using the publish methods: they are functionally the same.

    See Also:
    Session#createProducer(Destination), TopicSession#createPublisher(Topic)

    • Method Detail

      • getTopic

        public Topic getTopic()
               throws JMSException
        Gets the topic associated with this TopicPublisher.
        Specified by:
        getTopic in interface TopicPublisher
        Returns:
        this publisher's topic
        Throws:
        JMSException - if the JMS provider fails to get the topic for this TopicPublisher due to some internal error.

      • publish

        public void publish​(Message message,
                    int deliveryMode,
                    int priority,
                    long timeToLive)
             throws JMSException
        Publishes a message to the topic, specifying delivery mode, priority, and time to live.
        Specified by:
        publish in interface TopicPublisher
        Parameters:
        message - the message to publish
        deliveryMode - the delivery mode to use
        priority - the priority for this message
        timeToLive - the message's lifetime (in milliseconds)
        Throws:
        JMSException - if the JMS provider fails to publish the message due to some internal error.
        MessageFormatException - if an invalid message is specified.
        InvalidDestinationException - if a client uses this method with a TopicPublisher with an invalid topic.
        UnsupportedOperationException - if a client uses this method with a TopicPublisher that did not specify a topic at creation time.

      • publish

        public void publish​(Topic topic,
                    Message message)
             throws JMSException
        Publishes a message to a topic for an unidentified message producer. Uses the TopicPublisher's default delivery mode, priority, and time to live.

        Typically, a message producer is assigned a topic at creation time; however, the JMS API also supports unidentified message producers, which require that the topic be supplied every time a message is published.

        Specified by:
        publish in interface TopicPublisher
        Parameters:
        topic - the topic to publish this message to
        message - the message to publish
        Throws:
        JMSException - if the JMS provider fails to publish the message due to some internal error.
        MessageFormatException - if an invalid message is specified.
        InvalidDestinationException - if a client uses this method with an invalid topic.
        See Also:
        MessageProducer.getDeliveryMode(), MessageProducer.getTimeToLive(), MessageProducer.getPriority()

      • publish

        public void publish​(Topic topic,
                    Message message,
                    int deliveryMode,
                    int priority,
                    long timeToLive)
             throws JMSException
        Publishes a message to a topic for an unidentified message producer, specifying delivery mode, priority and time to live.

        Typically, a message producer is assigned a topic at creation time; however, the JMS API also supports unidentified message producers, which require that the topic be supplied every time a message is published.

        Specified by:
        publish in interface TopicPublisher
        Parameters:
        topic - the topic to publish this message to
        message - the message to publish
        deliveryMode - the delivery mode to use
        priority - the priority for this message
        timeToLive - the message's lifetime (in milliseconds)
        Throws:
        JMSException - if the JMS provider fails to publish the message due to some internal error.
        MessageFormatException - if an invalid message is specified.
        InvalidDestinationException - if a client uses this method with an invalid topic.