13 Oracle JMS Point-to-Point

This chapter describes the components of the Oracle Streams Advanced Queuing (AQ) Java Message Service (JMS) operational interface that are specific to point-to-point operations. Components that are shared by point-to-point and publish/subscribe are described in Chapter 15, "Oracle JMS Shared Interfaces".

This chapter contains these topics:

Creating a Connection with Username/Password

public javax.jms.Connection createConnection(
             java.lang.String username,
             java.lang.String password)
      throws JMSException

This method creates a connection supporting both point-to-point and publish/subscribe operations with the specified username and password. This method is new and supports JMS version 1.1 specifications. It has the following parameters:

Parameter Description
username Name of the user connecting to the database for queuing
password Password for creating the connection to the server

Creating a Connection with Default ConnectionFactory Parameters

public javax.jms.Connection createConnection()
      throws JMSException

This method creates a connection supporting both point-to-point and publish/subscribe operations with default ConnectionFactory parameters. This method is new and supports JMS version 1.1 specifications. If the ConnectionFactory properties do not contain a default username and password, then it throws a JMSException.

Creating a QueueConnection with Username/Password

public javax.jms.QueueConnection createQueueConnection(
             java.lang.String username,
             java.lang.String password)
      throws JMSException

This method creates a queue connection with the specified username and password. It has the following parameters:

Parameter Description
username Name of the user connecting to the database for queuing
password Password for creating the connection to the server

Example 13-1 Creating a QueueConnection with Username/Password

QueueConnectionFactory qc_fact = AQjmsFactory.getQueueConnectionFactory(
   "sun123", "oratest", 5521, "thin");
QueueConnection qc_conn = qc_fact.createQueueConnection("jmsuser", "jmsuser");

Creating a QueueConnection with an Open JDBC Connection

public static javax.jms.QueueConnection createQueueConnection(
   java.sql.Connection jdbc_connection)
   throws JMSException

This method creates a queue connection with an open JDBC connection. It is static and has the following parameter:

Parameter Description
jdbc_connection Valid open connection to the database

The method in Example 13-2 can be used if the user wants to use an existing JDBC connection (say from a connection pool) for JMS operations. In this case JMS does not open a new connection, but instead uses the supplied JDBC connection to create the JMS QueueConnection object.

Example 13-2 Creating a QueueConnection with an Open JDBC Connection

Connection db_conn;     /* previously opened JDBC connection */
QueueConnection qc_conn = AQjmsQueueConnectionFactory.createQueueConnection(
           db_conn);

The method in Example 13-3 is the only way to create a JMS QueueConnection when using JMS from a Java stored procedures inside the database (JDBC Server driver)

Example 13-3 Creating a QueueConnection from a Java Procedure Inside Database

OracleDriver ora = new OracleDriver();
QueueConnection qc_conn = AQjmsQueueConnectionFactory.createQueueConnection(ora.defaultConnection());

Creating a QueueConnection with Default ConnectionFactory Parameters

public javax.jms.QueueConnection createQueueConnection()
      throws JMSException

This method creates a queue connection with default ConnectionFactory parameters. If the queue connection factory properties do not contain a default username and password, then it throws a JMSException.

Creating a QueueConnection with an Open OracleOCIConnectionPool

public static javax.jms.QueueConnection createQueueConnection(
          oracle.jdbc.pool.OracleOCIConnectionPool cpool)
   throws JMSException

This method creates a queue connection with an open OracleOCIConnectionPool. It is static and has the following parameter:

Parameter Description
cpool Valid open OCI connection pool to the database

The method in Example 13-4 can be used if the user wants to use an existing OracleOCIConnectionPool instance for JMS operations. In this case JMS does not open an new OracleOCIConnectionPool instance, but instead uses the supplied OracleOCIConnectionPool instance to create the JMS QueueConnection object.

Example 13-4 Creating a QueueConnection with an Open OracleOCIConnectionPool

OracleOCIConnectionPool cpool; /* previously created OracleOCIConnectionPool */
QueueConnection qc_conn = AQjmsQueueConnectionFactory.createQueueConnection(cpool);

Creating a Session

public javax.jms.Session createSession(boolean transacted,
                                                 int ack_mode)
                                          throws JMSException

This method creates a Session, which supports both point-to-point and publish/subscribe operations. This method is new and supports JMS version 1.1 specifications. Transactional and nontransactional sessions are supported. It has the following parameters:

Parameter Description
transacted If set to true, then the session is transactional
ack_mode Indicates whether the consumer or the client will acknowledge any messages it receives. It is ignored if the session is transactional. Legal values are Session.AUTO_ACKNOWLEDGE, Session.CLIENT_ACKNOWLEDGE, and Session.DUPS_OK_ACKNOWLEDGE.

Creating a QueueSession

public javax.jms.QueueSession createQueueSession(
   boolean transacted, int ack_mode)
        throws JMSException

This method creates a QueueSession. Transactional and nontransactional sessions are supported. It has the following parameters:

Parameter Description
transacted If set to true, then the session is transactional
ack_mode Indicates whether the consumer or the client will acknowledge any messages it receives. It is ignored if the session is transactional. Legal values are Session.AUTO_ACKNOWLEDGE, Session.CLIENT_ACKNOWLEDGE, and Session.DUPS_OK_ACKNOWLEDGE.

Example 13-5 Creating a Transactional QueueSession

QueueConnection qc_conn;
QueueSession  q_sess = qc_conn.createQueueSession(true, 0);

Creating a QueueSender

public javax.jms.QueueSender createSender(javax.jms.Queue queue)
                                   throws JMSException

This method creates a QueueSender. If a sender is created without a default queue, then the destination queue must be specified on every send operation. It has the following parameter:

Parameter Description
queue Name of destination queue

Sending Messages Using a QueueSender with Default Send Options

public void send(javax.jms.Queue queue,
                 javax.jms.Message message)
          throws JMSException

This method sends a message using a QueueSender with default send options. This operation uses default values for message priority (1) and timeToLive (infinite). It has the following parameters:

Parameter Description
queue Queue to send this message to
message Message to send

If the QueueSender has been created with a default queue, then the queue parameter may not necessarily be supplied in the send() call. If a queue is specified in the send() operation, then this value overrides the default queue of the QueueSender.

If the QueueSender has been created without a default queue, then the queue parameter must be specified in every send() call.

Example 13-6 Creating a Sender to Send Messages to Any Queue

/* Create a sender to send messages to any queue */
QueueSession  jms_sess;
QueueSender  sender1;
TextMessage  message;
sender1 = jms_sess.createSender(null); 
sender1.send(queue, message);

Example 13-7 Creating a Sender to Send Messages to a Specific Queue

/* Create a sender to send messages to a specific queue */
QueueSession jms_sess;
QueueSender sender2;
Queue   billed_orders_que;
TextMessage  message;
sender2 = jms_sess.createSender(billed_orders_que);
sender2.send(queue, message);

Sending Messages Using a QueueSender by Specifying Send Options

public void send(javax.jms.Queue queue,
                 javax.jms.Message message,
                 int deliveryMode,
                 int priority,
                 long timeToLive)
          throws JMSException

This method sends messages using a QueueSender by specifying send options. It has the following parameters:

Parameter Description
queue Queue to send this message to
message Message to send
deliveryMode Delivery mode to use
priority Priority for this message
timeToLive Message lifetime in milliseconds (zero is unlimited)

If the QueueSender has been created with a default queue, then the queue parameter may not necessarily be supplied in the send() call. If a queue is specified in the send() operation, then this value overrides the default queue of the QueueSender.

If the QueueSender has been created without a default queue, then the queue parameter must be specified in every send() call.

Example 13-8 Sending Messages Using a QueueSender by Specifying Send Options 1

/* Create a sender to send messages to any queue */ 
/* Send a message to new_orders_que with priority 2 and timetoLive 100000 
   milliseconds */
QueueSession  jms_sess;
QueueSender  sender1;
TextMessage mesg;
Queue   new_orders_que
sender1 = jms_sess.createSender(null); 
sender1.send(new_orders_que, mesg, DeliveryMode.PERSISTENT, 2, 100000);

Example 13-9 Sending Messages Using a QueueSender by Specifying Send Options 2

/* Create a sender to send messages to a specific queue */ 
/* Send a message with priority 1 and timetoLive 400000 milliseconds */
QueueSession jms_sess;
QueueSender sender2;
Queue   billed_orders_que;
TextMessage mesg;
sender2 = jms_sess.createSender(billed_orders_que);
sender2.send(mesg, DeliveryMode.PERSISTENT, 1, 400000);

Creating a QueueBrowser for Standard JMS Type Messages

public javax.jms.QueueBrowser createBrowser(javax.jms.Queue queue,
                                            java.lang.String messageSelector)
                                     throws JMSException

This method creates a QueueBrowser for queues with text, stream, objects, bytes or MapMessage message bodies. It has the following parameters:

Parameter Description
queue Queue to access
messageSelector Only messages with properties matching the messageSelector expression are delivered

See Also:

"MessageSelector"

Use methods in java.util.Enumeration to go through list of messages.

Example 13-10 Creating a QueueBrowser Without a Selector

/* Create a browser without a selector */
QueueSession    jms_session;
QueueBrowser    browser;
Queue           queue;
browser = jms_session.createBrowser(queue);

Example 13-11 Creating a QueueBrowser With a Specified Selector

/* Create a browser for queues with a specified selector */
QueueSession    jms_session;
QueueBrowser    browser;
Queue           queue;
/* create a Browser to look at messages with correlationID = RUSH  */
browser = jms_session.createBrowser(queue, "JMSCorrelationID = 'RUSH'");

Creating a QueueBrowser for Standard JMS Type Messages, Locking Messages

public javax.jms.QueueBrowser createBrowser(javax.jms.Queue queue,
                                            java.lang.String messageSelector,
                                            boolean locked)
                                     throws JMSException

This method creates a QueueBrowser for queues with TextMessage, StreamMessage, ObjectMessage, BytesMessage, or MapMessage message bodies, locking messages while browsing. Locked messages cannot be removed by other consumers until the browsing session ends the transaction. It has the following parameters:

Parameter Description
queue Queue to access
messageSelector Only messages with properties matching the messageSelector expression are delivered
locked If set to true, then messages are locked as they are browsed (similar to a SELECT for UPDATE)

Example 13-12 Creating a QueueBrowser Without a Selector, Locking Messages

/* Create a browser without a selector */
QueueSession    jms_session;
QueueBrowser    browser;
Queue           queue;
browser = jms_session.createBrowser(queue, null, true);

Example 13-13 Creating a QueueBrowser With a Specified Selector, Locking Messages

/* Create a browser for queues with a specified selector */
QueueSession    jms_session;
QueueBrowser    browser;
Queue           queue;
/* create a Browser to look at messages with 
correlationID = RUSH in lock mode */
browser = jms_session.createBrowser(queue, "JMSCorrelationID = 'RUSH'", true);

Creating a QueueBrowser for Oracle Object Type Messages

public javax.jms.QueueBrowser createBrowser(javax.jms.Queue queue, 
                                            java.lang.String messageSelector,
                                            java.lang.Object payload_factory)
                                     throws JMSException

This method creates a QueueBrowser for queues of Oracle object type messages. It has the following parameters:

Parameter Description
queue Queue to access
messageSelector Only messages with properties matching the messageSelector expression are delivered
payload_factory CustomDatumFactory or ORADataFactory for the java class that maps to the Oracle ADT

See Also:

"MessageSelector"

The CustomDatumFactory for a particular java class that maps to the SQL object payload can be obtained using the getFactory static method.

Note:

CustomDatum support will be deprecated in a future release. Use ORADataFactory payload factories instead.

Assume the queue test_queue has payload of type SCOTT.EMPLOYEE and the java class that is generated by Jpublisher for this Oracle object type is called Employee. The Employee class implements the CustomDatum interface. The CustomDatumFactory for this class can be obtained by using the Employee.getFactory() method.

Example 13-14 Creating a QueueBrowser for ADTMessages

/* Create a browser for a Queue with AdtMessage messages of type EMPLOYEE*/
QueueSession jms_session
QueueBrowser browser;
Queue        test_queue;
browser = ((AQjmsSession)jms_session).createBrowser(test_queue,
                                                   "corrid='EXPRESS'",
                                                    Employee.getFactory());

Creating a QueueBrowser for Oracle Object Type Messages, Locking Messages

public javax.jms.QueueBrowser createBrowser(javax.jms.Queue queue,
                                            java.lang.String messageSelector,
                                            java.lang.Object payload_factory,
                                            boolean locked)
                                     throws JMSException

This method creates a QueueBrowser for queues of Oracle object type messages, locking messages while browsing. It has the following parameters:

Parameter Description
queue Queue to access
messageSelector Only messages with properties matching the messageSelector expression are delivered
payload_factory CustomDatumFactory or ORADataFactory for the java class that maps to the Oracle ADT
locked If set to true, then messages are locked as they are browsed (similar to a SELECT for UPDATE)

Note:

CustomDatum support will be deprecated in a future release. Use ORADataFactory payload factories instead.

Example 13-15 Creating a QueueBrowser for AdtMessages, Locking Messages

/* Create a browser for a Queue with AdtMessage messagess of type EMPLOYEE* in lock mode/
QueueSession jms_session
QueueBrowser browser;
Queue        test_queue;
browser = ((AQjmsSession)jms_session).createBrowser(test_queue, 
                                                    null, 
                                                    Employee.getFactory(),
                                                    true);

Creating a QueueReceiver for Standard JMS Type Messages

public javax.jms.QueueReceiver createReceiver(javax.jms.Queue queue,
                                              java.lang.String messageSelector)
                                       throws JMSException

This method creates a QueueReceiver for queues of standard JMS type messages. It has the following parameters:

Parameter Description
queue Queue to access
messageSelector Only messages with properties matching the messageSelector expression are delivered

See Also:

"MessageSelector"

Example 13-16 Creating a QueueReceiver Without a Selector

/* Create a receiver without a selector */
QueueSession    jms_session
QueueReceiver   receiver;
Queue           queue;
receiver = jms_session.createReceiver(queue);

Example 13-17 Creating a QueueReceiver With a Specified Selector

/* Create a receiver for queues with a specified selector */
QueueSession    jms_session;
QueueReceiver   receiver;
Queue           queue;
/* create Receiver to receive messages with correlationID starting with EXP  */
browser = jms_session.createReceiver(queue, "JMSCorrelationID LIKE 'EXP%'");

Creating a QueueReceiver for Oracle Object Type Messages

public javax.jms.QueueReceiver createReceiver(javax.jms.Queue queue,
                                              java.lang.String messageSelector,
                                              java.lang.Object payload_factory)
                                       throws JMSException

This method creates a QueueReceiver for queues of Oracle object type messages. It has the following parameters:

Parameter Description
queue Queue to access
messageSelector Only messages with properties matching the messageSelector expression are delivered
payload_factory CustomDatumFactory or ORADataFactory for the java class that maps to the Oracle ADT

See Also:

"MessageSelector"

The CustomDatumFactory for a particular java class that maps to the SQL object type payload can be obtained using the getFactory static method.

Note:

CustomDatum support will be deprecated in a future release. Use ORADataFactory payload factories instead.

Assume the queue test_queue has payload of type SCOTT.EMPLOYEE and the java class that is generated by Jpublisher for this Oracle object type is called Employee. The Employee class implements the CustomDatum interface. The ORADataFactory for this class can be obtained by using the Employee.getFactory() method.

Example 13-18 Creating a QueueReceiver for AdtMessage Messages

/* Create a receiver for a Queue with AdtMessage messages of type EMPLOYEE*/
QueueSession jms_session
QueueReceiver receiver;
Queue        test_queue;
browser = ((AQjmsSession)jms_session).createReceiver(
                 test_queue,
                "JMSCorrelationID = 'MANAGER', 
                 Employee.getFactory());