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Oracle® Streams Advanced Queuing Java API Reference
11g Release 2 (11.2)

E10768-01


javax.jms
Interface MessageProducer

All Known Subinterfaces:
AQjmsQueueSender, AQjmsTopicPublisher, QueueSender, TopicPublisher
All Known Implementing Classes:
AQjmsProducer, AQjmsQueueSenderImpl, AQjmsTopicPublisherImpl

public interface MessageProducer

A client uses a MessageProducer object to send messages to a destination. A MessageProducer object is created by passing a Destination object to a message-producer creation method supplied by a session.

MessageProducer is the parent interface for all message producers.

A client also has the option of creating a message producer without supplying a destination. In this case, a destination must be provided with every send operation. A typical use for this kind of message producer is to send replies to requests using the request's JMSReplyTo destination.

A client can specify a default delivery mode, priority, and time to live for messages sent by a message producer. It can also specify the delivery mode, priority, and time to live for an individual message.

A client can specify a time-to-live value in milliseconds for each message it sends. This value defines a message expiration time that is the sum of the message's time-to-live and the GMT when it is sent (for transacted sends, this is the time the client sends the message, not the time the transaction is committed).

A JMS provider should do its best to expire messages accurately; however, the JMS API does not define the accuracy provided.

See Also:
TopicPublisher, QueueSender, Session.createProducer(javax.jms.Destination)

Method Summary
 void close()
          Closes the message producer.
 int getDeliveryMode()
          Gets the producer's default delivery mode.
 Destination getDestination()
          Gets the destination associated with this MessageProducer.
 boolean getDisableMessageID()
          Gets an indication of whether message IDs are disabled.
 boolean getDisableMessageTimestamp()
          Gets an indication of whether message timestamps are disabled.
 int getPriority()
          Gets the producer's default priority.
 long getTimeToLive()
          Gets the default length of time in milliseconds from its dispatch time that a produced message should be retained by the message system.
 void send(Destination destination, Message message)
          Sends a message to a destination for an unidentified message producer.
 void send(Destination destination, Message message, int deliveryMode, int priority, long timeToLive)
          Sends a message to a destination for an unidentified message producer, specifying delivery mode, priority and time to live.
 void send(Message message)
          Sends a message using the MessageProducer's default delivery mode, priority, and time to live.
 void send(Message message, int deliveryMode, int priority, long timeToLive)
          Sends a message to the destination, specifying delivery mode, priority, and time to live.
 void setDeliveryMode(int deliveryMode)
          Sets the producer's default delivery mode.
 void setDisableMessageID(boolean value)
          Sets whether message IDs are disabled.
 void setDisableMessageTimestamp(boolean value)
          Sets whether message timestamps are disabled.
 void setPriority(int defaultPriority)
          Sets the producer's default priority.
 void setTimeToLive(long timeToLive)
          Sets the default length of time in milliseconds from its dispatch time that a produced message should be retained by the message system.

 

Method Detail

setDisableMessageID

void setDisableMessageID(boolean value)
                         throws JMSException
Sets whether message IDs are disabled.

Since message IDs take some effort to create and increase a message's size, some JMS providers may be able to optimize message overhead if they are given a hint that the message ID is not used by an application. By calling the setDisableMessageID method on this message producer, a JMS client enables this potential optimization for all messages sent by this message producer. If the JMS provider accepts this hint, these messages must have the message ID set to null; if the provider ignores the hint, the message ID must be set to its normal unique value.

Message IDs are enabled by default.

Parameters:
value - indicates if message IDs are disabled
Throws:
JMSException - if the JMS provider fails to set message ID to disabled due to some internal error.

getDisableMessageID

boolean getDisableMessageID()
                            throws JMSException
Gets an indication of whether message IDs are disabled.
Returns:
an indication of whether message IDs are disabled
Throws:
JMSException - if the JMS provider fails to determine if message IDs are disabled due to some internal error.

setDisableMessageTimestamp

void setDisableMessageTimestamp(boolean value)
                                throws JMSException
Sets whether message timestamps are disabled.

Since timestamps take some effort to create and increase a message's size, some JMS providers may be able to optimize message overhead if they are given a hint that the timestamp is not used by an application. By calling the setDisableMessageTimestamp method on this message producer, a JMS client enables this potential optimization for all messages sent by this message producer. If the JMS provider accepts this hint, these messages must have the timestamp set to zero; if the provider ignores the hint, the timestamp must be set to its normal value.

Message timestamps are enabled by default.

Parameters:
value - indicates if message timestamps are disabled
Throws:
JMSException - if the JMS provider fails to set timestamps to disabled due to some internal error.

getDisableMessageTimestamp

boolean getDisableMessageTimestamp()
                                   throws JMSException
Gets an indication of whether message timestamps are disabled.
Returns:
an indication of whether message timestamps are disabled
Throws:
JMSException - if the JMS provider fails to determine if timestamps are disabled due to some internal error.

setDeliveryMode

void setDeliveryMode(int deliveryMode)
                     throws JMSException
Sets the producer's default delivery mode.

Delivery mode is set to PERSISTENT by default.

Parameters:
deliveryMode - the message delivery mode for this message producer; legal values are DeliveryMode.NON_PERSISTENT and DeliveryMode.PERSISTENT
Throws:
JMSException - if the JMS provider fails to set the delivery mode due to some internal error.
See Also:
getDeliveryMode(), DeliveryMode.NON_PERSISTENT, DeliveryMode.PERSISTENT, Message.DEFAULT_DELIVERY_MODE

getDeliveryMode

int getDeliveryMode()
                    throws JMSException
Gets the producer's default delivery mode.
Returns:
the message delivery mode for this message producer
Throws:
JMSException - if the JMS provider fails to get the delivery mode due to some internal error.
See Also:
setDeliveryMode(int)

setPriority

void setPriority(int defaultPriority)
                 throws JMSException
Sets the producer's default priority.

The JMS API defines ten levels of priority value, with 0 as the lowest priority and 9 as the highest. Clients should consider priorities 0-4 as gradations of normal priority and priorities 5-9 as gradations of expedited priority. Priority is set to 4 by default.

Parameters:
defaultPriority - the message priority for this message producer; must be a value between 0 and 9
Throws:
JMSException - if the JMS provider fails to set the priority due to some internal error.
See Also:
getPriority(), Message.DEFAULT_PRIORITY

getPriority

int getPriority()
                throws JMSException
Gets the producer's default priority.
Returns:
the message priority for this message producer
Throws:
JMSException - if the JMS provider fails to get the priority due to some internal error.
See Also:
setPriority(int)

setTimeToLive

void setTimeToLive(long timeToLive)
                   throws JMSException
Sets the default length of time in milliseconds from its dispatch time that a produced message should be retained by the message system.

Time to live is set to zero by default.

Parameters:
timeToLive - the message time to live in milliseconds; zero is unlimited
Throws:
JMSException - if the JMS provider fails to set the time to live due to some internal error.
See Also:
getTimeToLive(), Message.DEFAULT_TIME_TO_LIVE

getTimeToLive

long getTimeToLive()
                   throws JMSException
Gets the default length of time in milliseconds from its dispatch time that a produced message should be retained by the message system.
Returns:
the message time to live in milliseconds; zero is unlimited
Throws:
JMSException - if the JMS provider fails to get the time to live due to some internal error.
See Also:
setTimeToLive(long)

getDestination

Destination getDestination()
                           throws JMSException
Gets the destination associated with this MessageProducer.
Returns:
this producer's Destination/
Throws:
JMSException - if the JMS provider fails to get the destination for this MessageProducer due to some internal error.
Since:
1.1

close

void close()
           throws JMSException
Closes the message producer.

Since a provider may allocate some resources on behalf of a MessageProducer outside the Java virtual machine, clients should close them when they are not needed. Relying on garbage collection to eventually reclaim these resources may not be timely enough.

Throws:
JMSException - if the JMS provider fails to close the producer due to some internal error.

send

void send(Message message)
          throws JMSException
Sends a message using the MessageProducer's default delivery mode, priority, and time to live.
Parameters:
message - the message to send
Throws:
JMSException - if the JMS provider fails to send the message due to some internal error.
MessageFormatException - if an invalid message is specified.
InvalidDestinationException - if a client uses this method with a MessageProducer with an invalid destination.
java.lang.UnsupportedOperationException - if a client uses this method with a MessageProducer that did not specify a destination at creation time.
Since:
1.1
See Also:
Session.createProducer(javax.jms.Destination), MessageProducer

send

void send(Message message,
          int deliveryMode,
          int priority,
          long timeToLive)
          throws JMSException
Sends a message to the destination, specifying delivery mode, priority, and time to live.
Parameters:
message - the message to send
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 send the message due to some internal error.
MessageFormatException - if an invalid message is specified.
InvalidDestinationException - if a client uses this method with a MessageProducer with an invalid destination.
java.lang.UnsupportedOperationException - if a client uses this method with a MessageProducer that did not specify a destination at creation time.
Since:
1.1
See Also:
Session.createProducer(javax.jms.Destination)

send

void send(Destination destination,
          Message message)
          throws JMSException
Sends a message to a destination for an unidentified message producer. Uses the MessageProducer's default delivery mode, priority, and time to live.

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

Parameters:
destination - the destination to send this message to
message - the message to send
Throws:
JMSException - if the JMS provider fails to send the message due to some internal error.
MessageFormatException - if an invalid message is specified.
InvalidDestinationException - if a client uses this method with an invalid destination.
java.lang.UnsupportedOperationException - if a client uses this method with a MessageProducer that specified a destination at creation time.
Since:
1.1
See Also:
Session.createProducer(javax.jms.Destination), MessageProducer

send

void send(Destination destination,
          Message message,
          int deliveryMode,
          int priority,
          long timeToLive)
          throws JMSException
Sends a message to a destination for an unidentified message producer, specifying delivery mode, priority and time to live.

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

Parameters:
destination - the destination to send this message to
message - the message to send
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 send the message due to some internal error.
MessageFormatException - if an invalid message is specified.
InvalidDestinationException - if a client uses this method with an invalid destination.
Since:
1.1
See Also:
Session.createProducer(javax.jms.Destination)

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Oracle® Streams Advanced Queuing Java API Reference
11g Release 2 (11.2)

E10768-01


Copyright © 2001 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.