javax.jms
Interface TopicPublisher

All Superinterfaces:

MessageProducer

public interface TopicPublisher
extends MessageProducer

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.

Version:

1.1 February 2, 2002

Author:

Mark Hapner, Rich Burridge, Kate Stout

See Also:

Session.createProducer(Destination), TopicSession.createPublisher(Topic)

Method Summary

Topic	getTopic() Gets the topic associated with this TopicPublisher.
void	publish(Message message) Publishes a message to the topic.
void	publish(Message message, int deliveryMode, int priority, long timeToLive) Publishes a message to the topic, specifying delivery mode, priority, and time to live.
void	publish(Topic topic, Message message) Publishes a message to a topic for an unidentified message producer.
void	publish(Topic topic, Message message, int deliveryMode, int priority, long timeToLive) Publishes a message to a topic for an unidentified message producer, specifying delivery mode, priority and time to live.

Methods inherited from interface javax.jms.MessageProducer

close, getDeliveryMode, getDestination, getDisableMessageID, getDisableMessageTimestamp, getPriority, getTimeToLive, send, send, send, send, setDeliveryMode, setDisableMessageID, setDisableMessageTimestamp, setPriority, setTimeToLive

Method Detail

getTopic

Topic getTopic()
               throws JMSException

Gets the topic associated with this 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

void publish(Message message)
             throws JMSException

Publishes a message to the topic. Uses the TopicPublisher's default delivery mode, priority, and time to live.

Parameters:

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 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.

See Also:

MessageProducer.getDeliveryMode(), MessageProducer.getTimeToLive(), MessageProducer.getPriority()

publish

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.

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

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.

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

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.

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.