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package javax.jms;
import java.io.Serializable;
/** <P>A <CODE>Session</CODE> object is a single-threaded context for producing and consuming
* messages. Although it may allocate provider resources outside the Java
* virtual machine (JVM), it is considered a lightweight JMS object.
*
* <P>A session serves several purposes:
*
* <UL>
* <LI>It is a factory for its message producers and consumers.
* <LI>It supplies provider-optimized message factories.
* <LI>It is a factory for <CODE>TemporaryTopics</CODE> and
* <CODE>TemporaryQueues</CODE>.
* <LI> It provides a way to create <CODE>Queue</CODE> or <CODE>Topic</CODE>
* objects for those clients that need to dynamically manipulate
* provider-specific destination names.
* <LI>It supports a single series of transactions that combine work
* spanning its producers and consumers into atomic units.
* <LI>It defines a serial order for the messages it consumes and
* the messages it produces.
* <LI>It retains messages it consumes until they have been
* acknowledged.
* <LI>It serializes execution of message listeners registered with
* its message consumers.
* <LI> It is a factory for <CODE>QueueBrowsers</CODE>.
* </UL>
*
* <P>A session can create and service multiple message producers and
* consumers.
*
* <P>One typical use is to have a thread block on a synchronous
* <CODE>MessageConsumer</CODE> until a message arrives. The thread may then
* use one or more of the <CODE>Session</CODE>'s <CODE>MessageProducer</CODE>s.
*
* <P>If a client desires to have one thread produce messages while others
* consume them, the client should use a separate session for its producing
* thread.
*
* <P>Once a connection has been started, any session with one or more
* registered message listeners is dedicated to the thread of control that
* delivers messages to it. It is erroneous for client code to use this session
* or any of its constituent objects from another thread of control. The
* only exception to this rule is the use of the session or connection
* <CODE>close</CODE> method.
*
* <P>It should be easy for most clients to partition their work naturally
* into sessions. This model allows clients to start simply and incrementally
* add message processing complexity as their need for concurrency grows.
*
* <P>The <CODE>close</CODE> method is the only session method that can be
* called while some other session method is being executed in another thread.
*
* <P>A session may be specified as transacted. Each transacted
* session supports a single series of transactions. Each transaction groups
* a set of message sends and a set of message receives into an atomic unit
* of work. In effect, transactions organize a session's input message
* stream and output message stream into series of atomic units. When a
* transaction commits, its atomic unit of input is acknowledged and its
* associated atomic unit of output is sent. If a transaction rollback is
* done, the transaction's sent messages are destroyed and the session's input
* is automatically recovered.
*
* <P>The content of a transaction's input and output units is simply those
* messages that have been produced and consumed within the session's current
* transaction.
*
* <P>A transaction is completed using either its session's <CODE>commit</CODE>
* method or its session's <CODE>rollback</CODE> method. The completion of a
* session's current transaction automatically begins the next. The result is
* that a transacted session always has a current transaction within which its
* work is done.
*
* <P>The Java Transaction Service (JTS) or some other transaction monitor may
* be used to combine a session's transaction with transactions on other
* resources (databases, other JMS sessions, etc.). Since Java distributed
* transactions are controlled via the Java Transaction API (JTA), use of the
* session's <CODE>commit</CODE> and <CODE>rollback</CODE> methods in
* this context is prohibited.
*
* <P>The JMS API does not require support for JTA; however, it does define
* how a provider supplies this support.
*
* <P>Although it is also possible for a JMS client to handle distributed
* transactions directly, it is unlikely that many JMS clients will do this.
* Support for JTA in the JMS API is targeted at systems vendors who will be
* integrating the JMS API into their application server products.
*
* @version 1.1 February 2, 2002
* @author Mark Hapner
* @author Rich Burridge
* @author Kate Stout
*
* @see javax.jms.QueueSession
* @see javax.jms.TopicSession
* @see javax.jms.XASession
*/
public interface Session extends Runnable {
/** With this acknowledgment mode, the session automatically acknowledges
* a client's receipt of a message either when the session has successfully
* returned from a call to <CODE>receive</CODE> or when the message
* listener the session has called to process the message successfully
* returns.
*/
static final int AUTO_ACKNOWLEDGE = 1;
/** With this acknowledgment mode, the client acknowledges a consumed
* message by calling the message's <CODE>acknowledge</CODE> method.
* Acknowledging a consumed message acknowledges all messages that the
* session has consumed.
*
* <P>When client acknowledgment mode is used, a client may build up a
* large number of unacknowledged messages while attempting to process
* them. A JMS provider should provide administrators with a way to
* limit client overrun so that clients are not driven to resource
* exhaustion and ensuing failure when some resource they are using
* is temporarily blocked.
*
* @see javax.jms.Message#acknowledge()
*/
static final int CLIENT_ACKNOWLEDGE = 2;
/** This acknowledgment mode instructs the session to lazily acknowledge
* the delivery of messages. This is likely to result in the delivery of
* some duplicate messages if the JMS provider fails, so it should only be
* used by consumers that can tolerate duplicate messages. Use of this
* mode can reduce session overhead by minimizing the work the
* session does to prevent duplicates.
*/
static final int DUPS_OK_ACKNOWLEDGE = 3;
/** This value is returned from the method
* <CODE>getAcknowledgeMode</CODE> if the session is transacted.
* If a <CODE>Session</CODE> is transacted, the acknowledgement mode
* is ignored.
*/
static final int SESSION_TRANSACTED = 0;
/** Creates a <CODE>BytesMessage</CODE> object. A <CODE>BytesMessage</CODE>
* object is used to send a message containing a stream of uninterpreted
* bytes.
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
BytesMessage
createBytesMessage() throws JMSException;
/** Creates a <CODE>MapMessage</CODE> object. A <CODE>MapMessage</CODE>
* object is used to send a self-defining set of name-value pairs, where
* names are <CODE>String</CODE> objects and values are primitive values
* in the Java programming language.
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
MapMessage
createMapMessage() throws JMSException;
/** Creates a <CODE>Message</CODE> object. The <CODE>Message</CODE>
* interface is the root interface of all JMS messages. A
* <CODE>Message</CODE> object holds all the
* standard message header information. It can be sent when a message
* containing only header information is sufficient.
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
Message
createMessage() throws JMSException;
/** Creates an <CODE>ObjectMessage</CODE> object. An
* <CODE>ObjectMessage</CODE> object is used to send a message
* that contains a serializable Java object.
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
ObjectMessage
createObjectMessage() throws JMSException;
/** Creates an initialized <CODE>ObjectMessage</CODE> object. An
* <CODE>ObjectMessage</CODE> object is used
* to send a message that contains a serializable Java object.
*
* @param object the object to use to initialize this message
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
ObjectMessage
createObjectMessage(Serializable object) throws JMSException;
/** Creates a <CODE>StreamMessage</CODE> object. A
* <CODE>StreamMessage</CODE> object is used to send a
* self-defining stream of primitive values in the Java programming
* language.
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
StreamMessage
createStreamMessage() throws JMSException;
/** Creates a <CODE>TextMessage</CODE> object. A <CODE>TextMessage</CODE>
* object is used to send a message containing a <CODE>String</CODE>
* object.
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
TextMessage
createTextMessage() throws JMSException;
/** Creates an initialized <CODE>TextMessage</CODE> object. A
* <CODE>TextMessage</CODE> object is used to send
* a message containing a <CODE>String</CODE>.
*
* @param text the string used to initialize this message
*
* @exception JMSException if the JMS provider fails to create this message
* due to some internal error.
*/
TextMessage
createTextMessage(String text) throws JMSException;
/** Indicates whether the session is in transacted mode.
*
* @return true if the session is in transacted mode
*
* @exception JMSException if the JMS provider fails to return the
* transaction mode due to some internal error.
*/
boolean
getTransacted() throws JMSException;
/** Returns the acknowledgement mode of the session. The acknowledgement
* mode is set at the time that the session is created. If the session is
* transacted, the acknowledgement mode is ignored.
*
*@return If the session is not transacted, returns the
* current acknowledgement mode for the session.
* If the session
* is transacted, returns SESSION_TRANSACTED.
*
*@exception JMSException if the JMS provider fails to return the
* acknowledgment mode due to some internal error.
*
*@see Connection#createSession
*@since 1.1
*/
int
getAcknowledgeMode() throws JMSException;
/** Commits all messages done in this transaction and releases any locks
* currently held.
*
* @exception JMSException if the JMS provider fails to commit the
* transaction due to some internal error.
* @exception TransactionRolledBackException if the transaction
* is rolled back due to some internal error
* during commit.
* @exception IllegalStateException if the method is not called by a
* transacted session.
*/
void
commit() throws JMSException;
/** Rolls back any messages done in this transaction and releases any locks
* currently held.
*
* @exception JMSException if the JMS provider fails to roll back the
* transaction due to some internal error.
* @exception IllegalStateException if the method is not called by a
* transacted session.
*
*/
void
rollback() throws JMSException;
/** Closes the session.
*
* <P>Since a provider may allocate some resources on behalf of a session
* outside the JVM, clients should close the resources when they are not
* needed.
* Relying on garbage collection to eventually reclaim these resources
* may not be timely enough.
*
* <P>There is no need to close the producers and consumers
* of a closed session.
*
* <P> This call will block until a <CODE>receive</CODE> call or message
* listener in progress has completed. A blocked message consumer
* <CODE>receive</CODE> call returns <CODE>null</CODE> when this session
* is closed.
*
* <P>Closing a transacted session must roll back the transaction
* in progress.
*
* <P>This method is the only <CODE>Session</CODE> method that can
* be called concurrently.
*
* <P>Invoking any other <CODE>Session</CODE> method on a closed session
* must throw a <CODE>JMSException.IllegalStateException</CODE>. Closing a
* closed session must <I>not</I> throw an exception.
*
* @exception JMSException if the JMS provider fails to close the
* session due to some internal error.
*/
void
close() throws JMSException;
/** Stops message delivery in this session, and restarts message delivery
* with the oldest unacknowledged message.
*
* <P>All consumers deliver messages in a serial order.
* Acknowledging a received message automatically acknowledges all
* messages that have been delivered to the client.
*
* <P>Restarting a session causes it to take the following actions:
*
* <UL>
* <LI>Stop message delivery
* <LI>Mark all messages that might have been delivered but not
* acknowledged as "redelivered"
* <LI>Restart the delivery sequence including all unacknowledged
* messages that had been previously delivered. Redelivered messages
* do not have to be delivered in
* exactly their original delivery order.
* </UL>
*
* @exception JMSException if the JMS provider fails to stop and restart
* message delivery due to some internal error.
* @exception IllegalStateException if the method is called by a
* transacted session.
*/
void
recover() throws JMSException;
/** Returns the session's distinguished message listener (optional).
*
* @return the message listener associated with this session
*
* @exception JMSException if the JMS provider fails to get the message
* listener due to an internal error.
*
* @see javax.jms.Session#setMessageListener
* @see javax.jms.ServerSessionPool
* @see javax.jms.ServerSession
*/
MessageListener
getMessageListener() throws JMSException;
/** Sets the session's distinguished message listener (optional).
*
* <P>When the distinguished message listener is set, no other form of
* message receipt in the session can
* be used; however, all forms of sending messages are still supported.
*
* <P>This is an expert facility not used by regular JMS clients.
*
* @param listener the message listener to associate with this session
*
* @exception JMSException if the JMS provider fails to set the message
* listener due to an internal error.
*
* @see javax.jms.Session#getMessageListener
* @see javax.jms.ServerSessionPool
* @see javax.jms.ServerSession
*/
void
setMessageListener(MessageListener listener) throws JMSException;
/**
* Optional operation, intended to be used only by Application Servers,
* not by ordinary JMS clients.
*
* @see javax.jms.ServerSession
*/
public void run();
/** Creates a <CODE>MessageProducer</CODE> to send messages to the specified
* destination.
*
* <P>A client uses a <CODE>MessageProducer</CODE> object to send
* messages to a destination. Since <CODE>Queue</CODE> and <CODE>Topic</CODE>
* both inherit from <CODE>Destination</CODE>, they can be used in
* the destination parameter to create a <CODE>MessageProducer</CODE> object.
*
* @param destination the <CODE>Destination</CODE> to send to,
* or null if this is a producer which does not have a specified
* destination.
*
* @exception JMSException if the session fails to create a MessageProducer
* due to some internal error.
* @exception InvalidDestinationException if an invalid destination
* is specified.
*
* @since 1.1
*
*/
MessageProducer
createProducer(Destination destination) throws JMSException;
/** Creates a <CODE>MessageConsumer</CODE> for the specified destination.
* Since <CODE>Queue</CODE> and <CODE>Topic</CODE>
* both inherit from <CODE>Destination</CODE>, they can be used in
* the destination parameter to create a <CODE>MessageConsumer</CODE>.
*
* @param destination the <CODE>Destination</CODE> to access.
*
* @exception JMSException if the session fails to create a consumer
* due to some internal error.
* @exception InvalidDestinationException if an invalid destination
* is specified.
*
* @since 1.1
*/
MessageConsumer
createConsumer(Destination destination) throws JMSException;
/** Creates a <CODE>MessageConsumer</CODE> for the specified destination,
* using a message selector.
* Since <CODE>Queue</CODE> and <CODE>Topic</CODE>
* both inherit from <CODE>Destination</CODE>, they can be used in
* the destination parameter to create a <CODE>MessageConsumer</CODE>.
*
* <P>A client uses a <CODE>MessageConsumer</CODE> object to receive
* messages that have been sent to a destination.
*
*
* @param destination the <CODE>Destination</CODE> to access
* @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.
*
*
* @exception JMSException if the session fails to create a MessageConsumer
* due to some internal error.
* @exception InvalidDestinationException if an invalid destination
* is specified.
* @exception InvalidSelectorException if the message selector is invalid.
*
* @since 1.1
*/
MessageConsumer
createConsumer(Destination destination, java.lang.String messageSelector)
throws JMSException;
/** Creates <CODE>MessageConsumer</CODE> for the specified destination, using a
* message selector. This method can specify whether messages published by
* its own connection should be delivered to it, if the destination is a
* topic.
*<P> Since <CODE>Queue</CODE> and <CODE>Topic</CODE>
* both inherit from <CODE>Destination</CODE>, they can be used in
* the destination parameter to create a <CODE>MessageConsumer</CODE>.
* <P>A client uses a <CODE>MessageConsumer</CODE> object to receive
* messages that have been published to a destination.
*
* <P>In some cases, a connection may both publish and subscribe to a
* topic. The consumer <CODE>NoLocal</CODE> attribute allows a consumer
* to inhibit the delivery of messages published by its own connection.
* The default value for this attribute is False. The <CODE>noLocal</CODE>
* value must be supported by destinations that are topics.
*
* @param destination the <CODE>Destination</CODE> to access
* @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 true, and the destination is a topic,
* inhibits the delivery of messages published
* by its own connection. The behavior for
* <CODE>NoLocal</CODE> is
* not specified if the destination is a queue.
*
* @exception JMSException if the session fails to create a MessageConsumer
* due to some internal error.
* @exception InvalidDestinationException if an invalid destination
* is specified.
* @exception InvalidSelectorException if the message selector is invalid.
*
* @since 1.1
*
*/
MessageConsumer
createConsumer(Destination destination, java.lang.String messageSelector,
boolean NoLocal) throws JMSException;
/** Creates a queue identity given a <CODE>Queue</CODE> name.
*
* <P>This facility is provided for the rare cases where clients need to
* dynamically manipulate queue identity. It allows the creation of a
* queue 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 queue.
* The physical creation of queues is an administrative task and is not
* to be initiated by the JMS API. The one exception is the
* creation of temporary queues, which is accomplished with the
* <CODE>createTemporaryQueue</CODE> method.
*
* @param queueName the name of this <CODE>Queue</CODE>
*
* @return a <CODE>Queue</CODE> with the given name
*
* @exception JMSException if the session fails to create a queue
* due to some internal error.
* @since 1.1
*/
Queue
createQueue(String queueName) throws JMSException;
/** 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.
* @since 1.1
*/
Topic
createTopic(String topicName) throws JMSException;
/** Creates a <CODE>QueueBrowser</CODE> object to peek at the messages on
* the specified queue.
*
* @param queue the <CODE>queue</CODE> to access
*
* @exception InvalidDestinationException if an invalid destination
* is specified
*
* @since 1.1
*/
/** 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.
*
* @since 1.1
*/
TopicSubscriber
createDurableSubscriber(Topic topic,
String name) throws JMSException;
/** Creates a durable subscriber to the specified topic, using a
* message selector and 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.
*
* @since 1.1
*/
TopicSubscriber
createDurableSubscriber(Topic topic,
String name,
String messageSelector,
boolean noLocal) throws JMSException;
/** Creates a <CODE>QueueBrowser</CODE> object to peek at the messages on
* the specified queue.
*
* @param queue the <CODE>queue</CODE> to access
*
*
* @exception JMSException if the session fails to create a browser
* due to some internal error.
* @exception InvalidDestinationException if an invalid destination
* is specified
*
* @since 1.1
*/
QueueBrowser
createBrowser(Queue queue) throws JMSException;
/** Creates a <CODE>QueueBrowser</CODE> object to peek at the messages on
* the specified queue using a message selector.
*
* @param queue the <CODE>queue</CODE> to access
*
* @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.
*
* @exception JMSException if the session fails to create a browser
* due to some internal error.
* @exception InvalidDestinationException if an invalid destination
* is specified
* @exception InvalidSelectorException if the message selector is invalid.
*
* @since 1.1
*/
QueueBrowser
createBrowser(Queue queue,
String messageSelector) throws JMSException;
/** Creates a <CODE>TemporaryQueue</CODE> object. Its lifetime will be that
* of the <CODE>Connection</CODE> unless it is deleted earlier.
*
* @return a temporary queue identity
*
* @exception JMSException if the session fails to create a temporary queue
* due to some internal error.
*
*@since 1.1
*/
TemporaryQueue
createTemporaryQueue() throws JMSException;
/** Creates a <CODE>TemporaryTopic</CODE> object. Its lifetime will be that
* of the <CODE>Connection</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.
*
* @since 1.1
*/
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>MessageConsumer</CODE>
* or <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.
*
* @since 1.1
*/
void
unsubscribe(String name) throws JMSException;
}
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