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package javax.jms;
/** A client uses a <CODE>TopicPublisher</CODE> object to publish messages on a
* topic. A <CODE>TopicPublisher</CODE> object is the publish-subscribe form
* of a message producer.
*
* <P>Normally, the <CODE>Topic</CODE> is specified when a
* <CODE>TopicPublisher</CODE> is created. In this case, an attempt to use
* the <CODE>publish</CODE> methods for an unidentified
* <CODE>TopicPublisher</CODE> will throw a
* <CODE>java.lang.UnsupportedOperationException</CODE>.
*
* <P>If the <CODE>TopicPublisher</CODE> is created with an unidentified
* <CODE>Topic</CODE>, an attempt to use the <CODE>publish</CODE> methods that
* assume that the <CODE>Topic</CODE> has been identified will throw a
* <CODE>java.lang.UnsupportedOperationException</CODE>.
*
* <P>During the execution of its <CODE>publish</CODE> method,
* a message must not be changed by other threads within the client.
* If the message is modified, the result of the <CODE>publish</CODE> is
* undefined.
*
* <P>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.
*
* <P>The following message headers are set as part of publishing a
* message: <code>JMSDestination</code>, <code>JMSDeliveryMode</code>,
* <code>JMSExpiration</code>, <code>JMSPriority</code>,
* <code>JMSMessageID</code> and <code>JMSTimeStamp</code>.
* When the message is published, the values of these headers are ignored.
* After completion of the <CODE>publish</CODE>, the headers hold the values
* specified by the method publishing the message. It is possible for the
* <CODE>publish</CODE> method not to set <code>JMSMessageID</code> and
* <code>JMSTimeStamp</code> if the
* setting of these headers is explicitly disabled by the
* <code>MessageProducer.setDisableMessageID</code> or
* <code>MessageProducer.setDisableMessageTimestamp</code> method.
*
*<P>Creating a <CODE>MessageProducer</CODE> provides the same features as
* creating a <CODE>TopicPublisher</CODE>. A <CODE>MessageProducer</CODE> object is
* recommended when creating new code. The <CODE>TopicPublisher</CODE> is
* provided to support existing code.
*
*<P>Because <CODE>TopicPublisher</CODE> inherits from
* <CODE>MessageProducer</CODE>, it inherits the
* <CODE>send</CODE> methods that are a part of the <CODE>MessageProducer</CODE>
* interface. Using the <CODE>send</CODE> methods will have the same
* effect as using the
* <CODE>publish</CODE> methods: they are functionally the same.
*
*
* @version 1.1 February 2, 2002
* @author Mark Hapner
* @author Rich Burridge
* @author Kate Stout
*
* @see Session#createProducer(Destination)
* @see TopicSession#createPublisher(Topic)
*/
public interface TopicPublisher extends MessageProducer {
/** Gets the topic associated with this <CODE>TopicPublisher</CODE>.
*
* @return this publisher's topic
*
* @exception JMSException if the JMS provider fails to get the topic for
* this <CODE>TopicPublisher</CODE>
* due to some internal error.
*/
Topic
getTopic() throws JMSException;
/** Publishes a message to the topic.
* Uses the <CODE>TopicPublisher</CODE>'s default delivery mode, priority,
* and time to live.
*
* @param message the message to publish
*
* @exception JMSException if the JMS provider fails to publish the message
* due to some internal error.
* @exception MessageFormatException if an invalid message is specified.
* @exception InvalidDestinationException if a client uses this method
* with a <CODE>TopicPublisher</CODE> with
* an invalid topic.
* @exception java.lang.UnsupportedOperationException if a client uses this
* method with a <CODE>TopicPublisher</CODE> that
* did not specify a topic at creation time.
*
* @see javax.jms.MessageProducer#getDeliveryMode()
* @see javax.jms.MessageProducer#getTimeToLive()
* @see javax.jms.MessageProducer#getPriority()
*/
void
publish(Message message) throws JMSException;
/** Publishes a message to the topic, specifying delivery mode,
* priority, and time to live.
*
* @param message the message to publish
* @param deliveryMode the delivery mode to use
* @param priority the priority for this message
* @param timeToLive the message's lifetime (in milliseconds)
*
* @exception JMSException if the JMS provider fails to publish the message
* due to some internal error.
* @exception MessageFormatException if an invalid message is specified.
* @exception InvalidDestinationException if a client uses this method
* with a <CODE>TopicPublisher</CODE> with
* an invalid topic.
* @exception java.lang.UnsupportedOperationException if a client uses this
* method with a <CODE>TopicPublisher</CODE> that
* did not specify a topic at creation time.
*/
void
publish(Message message,
int deliveryMode,
int priority,
long timeToLive) throws JMSException;
/** Publishes a message to a topic for an unidentified message producer.
* Uses the <CODE>TopicPublisher</CODE>'s default delivery mode,
* priority, and time to live.
*
* <P>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.
*
* @param topic the topic to publish this message to
* @param message the message to publish
*
* @exception JMSException if the JMS provider fails to publish the message
* due to some internal error.
* @exception MessageFormatException if an invalid message is specified.
* @exception InvalidDestinationException if a client uses
* this method with an invalid topic.
*
* @see javax.jms.MessageProducer#getDeliveryMode()
* @see javax.jms.MessageProducer#getTimeToLive()
* @see javax.jms.MessageProducer#getPriority()
*/
void
publish(Topic topic, Message message) throws JMSException;
/** Publishes a message to a topic for an unidentified message
* producer, specifying delivery mode, priority and time to live.
*
* <P>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.
*
* @param topic the topic to publish this message to
* @param message the message to publish
* @param deliveryMode the delivery mode to use
* @param priority the priority for this message
* @param timeToLive the message's lifetime (in milliseconds)
*
* @exception JMSException if the JMS provider fails to publish the message
* due to some internal error.
* @exception MessageFormatException if an invalid message is specified.
* @exception InvalidDestinationException if a client uses
* this method with an invalid topic.
*/
void
publish(Topic topic,
Message message,
int deliveryMode,
int priority,
long timeToLive) throws JMSException;
}
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