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package javax.jms;
/**
* A <CODE>TopicSession</CODE> object provides methods for creating
* <CODE>TopicPublisher</CODE>, <CODE>TopicSubscriber</CODE>, and
* <CODE>TemporaryTopic</CODE> objects. It also provides a method for deleting
* its client's durable subscribers.
*
*<P>
* A <CODE>TopicSession</CODE> is used for creating Pub/Sub specific objects. In
* general, use the <CODE>Session</CODE> object, and use
* <CODE>TopicSession</CODE> only to support existing code. Using the
* <CODE>Session</CODE> object simplifies the programming model, and allows
* transactions to be used across the two messaging domains.
*
* <P>
* A <CODE>TopicSession</CODE> cannot be used to create objects specific to the
* point-to-point domain. The following methods inherit from
* <CODE>Session</CODE>, but must throw an <CODE>IllegalStateException</CODE> if
* used from <CODE>TopicSession</CODE>:
*<UL>
* <LI><CODE>createBrowser</CODE>
* <LI><CODE>createQueue</CODE>
* <LI><CODE>createTemporaryQueue</CODE>
*</UL>
*
* @version 1.1 - April 9, 2002
* @author Mark Hapner
* @author Rich Burridge
* @author Kate Stout
*
* @see javax.jms.Session
* @see javax.jms.Connection#createSession(boolean, int)
* @see javax.jms.TopicConnection#createTopicSession(boolean, int)
* @see javax.jms.XATopicSession#getTopicSession()
*/
public interface TopicSession extends Session {
/**
* Creates a topic identity given a <CODE>Topic</CODE> name.
*
* <P>
* This facility is provided for the rare cases where clients need to
* dynamically manipulate topic identity. This allows the creation of a
* topic identity with a provider-specific name. Clients that depend on this
* ability are not portable.
*
* <P>
* Note that this method is not for creating the physical topic. The
* physical creation of topics is an administrative task and is not to be
* initiated by the JMS API. The one exception is the creation of temporary
* topics, which is accomplished with the <CODE>createTemporaryTopic</CODE>
* method.
*
* @param topicName
* the name of this <CODE>Topic</CODE>
*
* @return a <CODE>Topic</CODE> with the given name
*
* @exception JMSException
* if the session fails to create a topic due to some
* internal error.
*/
Topic createTopic(String topicName) throws JMSException;
/**
* Creates a nondurable subscriber to the specified topic.
*
* <P>
* A client uses a <CODE>TopicSubscriber</CODE> object to receive messages
* that have been published to a topic.
*
* <P>
* Regular <CODE>TopicSubscriber</CODE> objects are not durable. They
* receive only messages that are published while they are active.
*
* <P>
* In some cases, a connection may both publish and subscribe to a topic.
* The subscriber <CODE>NoLocal</CODE> attribute allows a subscriber to
* inhibit the delivery of messages published by its own connection. The
* default value for this attribute is false.
*
* @param topic
* the <CODE>Topic</CODE> to subscribe to
*
* @exception JMSException
* if the session fails to create a subscriber due to some
* internal error.
* @exception InvalidDestinationException
* if an invalid topic is specified.
*/
TopicSubscriber createSubscriber(Topic topic) throws JMSException;
/**
* Creates a nondurable subscriber to the specified topic, using a message
* selector or specifying whether messages published by its own connection
* should be delivered to it.
*
* <P>
* A client uses a <CODE>TopicSubscriber</CODE> object to receive messages
* that have been published to a topic.
*
* <P>
* Regular <CODE>TopicSubscriber</CODE> objects are not durable. They
* receive only messages that are published while they are active.
*
* <P>
* Messages filtered out by a subscriber's message selector will never be
* delivered to the subscriber. From the subscriber's perspective, they do
* not exist.
*
* <P>
* In some cases, a connection may both publish and subscribe to a topic.
* The subscriber <CODE>NoLocal</CODE> attribute allows a subscriber to
* inhibit the delivery of messages published by its own connection. The
* default value for this attribute is false.
*
* @param topic
* the <CODE>Topic</CODE> to subscribe to
* @param messageSelector
* only messages with properties matching the message selector
* expression are delivered. A value of null or an empty string
* indicates that there is no message selector for the message
* consumer.
* @param noLocal
* if set, inhibits the delivery of messages published by its own
* connection
*
* @exception JMSException
* if the session fails to create a subscriber due to some
* internal error.
* @exception InvalidDestinationException
* if an invalid topic is specified.
* @exception InvalidSelectorException
* if the message selector is invalid.
*/
TopicSubscriber createSubscriber(Topic topic, String messageSelector,
boolean noLocal) throws JMSException;
/**
* Creates a durable subscriber to the specified topic.
*
* <P>
* If a client needs to receive all the messages published on a topic,
* including the ones published while the subscriber is inactive, it uses a
* durable <CODE>TopicSubscriber</CODE>. The JMS provider retains a record
* of this durable subscription and insures that all messages from the
* topic's publishers are retained until they are acknowledged by this
* durable subscriber or they have expired.
*
* <P>
* Sessions with durable subscribers must always provide the same client
* identifier. In addition, each client must specify a name that uniquely
* identifies (within client identifier) each durable subscription it
* creates. Only one session at a time can have a
* <CODE>TopicSubscriber</CODE> for a particular durable subscription.
*
* <P>
* A client can change an existing durable subscription by creating a
* durable <CODE>TopicSubscriber</CODE> with the same name and a new topic
* and/or message selector. Changing a durable subscriber is equivalent to
* unsubscribing (deleting) the old one and creating a new one.
*
* <P>
* In some cases, a connection may both publish and subscribe to a topic.
* The subscriber <CODE>NoLocal</CODE> attribute allows a subscriber to
* inhibit the delivery of messages published by its own connection. The
* default value for this attribute is false.
*
* @param topic
* the non-temporary <CODE>Topic</CODE> to subscribe to
* @param name
* the name used to identify this subscription
*
* @exception JMSException
* if the session fails to create a subscriber due to some
* internal error.
* @exception InvalidDestinationException
* if an invalid topic is specified.
*/
TopicSubscriber createDurableSubscriber(Topic topic, String name)
throws JMSException;
/**
* Creates a durable subscriber to the specified topic, using a message
* selector or specifying whether messages published by its own connection
* should be delivered to it.
*
* <P>
* If a client needs to receive all the messages published on a topic,
* including the ones published while the subscriber is inactive, it uses a
* durable <CODE>TopicSubscriber</CODE>. The JMS provider retains a record
* of this durable subscription and insures that all messages from the
* topic's publishers are retained until they are acknowledged by this
* durable subscriber or they have expired.
*
* <P>
* Sessions with durable subscribers must always provide the same client
* identifier. In addition, each client must specify a name which uniquely
* identifies (within client identifier) each durable subscription it
* creates. Only one session at a time can have a
* <CODE>TopicSubscriber</CODE> for a particular durable subscription. An
* inactive durable subscriber is one that exists but does not currently
* have a message consumer associated with it.
*
* <P>
* A client can change an existing durable subscription by creating a
* durable <CODE>TopicSubscriber</CODE> with the same name and a new topic
* and/or message selector. Changing a durable subscriber is equivalent to
* unsubscribing (deleting) the old one and creating a new one.
*
* @param topic
* the non-temporary <CODE>Topic</CODE> to subscribe to
* @param name
* the name used to identify this subscription
* @param messageSelector
* only messages with properties matching the message selector
* expression are delivered. A value of null or an empty string
* indicates that there is no message selector for the message
* consumer.
* @param noLocal
* if set, inhibits the delivery of messages published by its own
* connection
*
* @exception JMSException
* if the session fails to create a subscriber due to some
* internal error.
* @exception InvalidDestinationException
* if an invalid topic is specified.
* @exception InvalidSelectorException
* if the message selector is invalid.
*/
TopicSubscriber createDurableSubscriber(Topic topic, String name,
String messageSelector, boolean noLocal) throws JMSException;
/**
* Creates a publisher for the specified topic.
*
* <P>
* A client uses a <CODE>TopicPublisher</CODE> object to publish messages on
* a topic. Each time a client creates a <CODE>TopicPublisher</CODE> on a
* topic, it defines a new sequence of messages that have no ordering
* relationship with the messages it has previously sent.
*
* @param topic
* the <CODE>Topic</CODE> to publish to, or null if this is an
* unidentified producer
*
* @exception JMSException
* if the session fails to create a publisher due to some
* internal error.
* @exception InvalidDestinationException
* if an invalid topic is specified.
*/
TopicPublisher createPublisher(Topic topic) throws JMSException;
/**
* Creates a <CODE>TemporaryTopic</CODE> object. Its lifetime will be that
* of the <CODE>TopicConnection</CODE> unless it is deleted earlier.
*
* @return a temporary topic identity
*
* @exception JMSException
* if the session fails to create a temporary topic due to
* some internal error.
*/
TemporaryTopic createTemporaryTopic() throws JMSException;
/**
* Unsubscribes a durable subscription that has been created by a client.
*
* <P>
* This method deletes the state being maintained on behalf of the
* subscriber by its provider.
*
* <P>
* It is erroneous for a client to delete a durable subscription while there
* is an active <CODE>TopicSubscriber</CODE> for the subscription, or while
* a consumed message is part of a pending transaction or has not been
* acknowledged in the session.
*
* @param name
* the name used to identify this subscription
*
* @exception JMSException
* if the session fails to unsubscribe to the durable
* subscription due to some internal error.
* @exception InvalidDestinationException
* if an invalid subscription name is specified.
*/
void unsubscribe(String name) throws JMSException;
}
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