PLSQL enqueue -- Java client

Question

Hi
Can anyone shed some light on how to enqueue a message using dbms_aq.enqueue() and have a (connected) java client pick it up?
I have managed to get a java-to-java pub/sub to work - I would like to do this with both a standard and multi-consumer queue.
Thanks in advance.

Answer 1

PL/SQL to send a JMS message to the SCO_QUEUE queue
DECLARE
Enqueue_options DBMS_AQ.enqueue_options_t;
Message_properties DBMS_AQ.message_properties_t;
Message_handle RAW(16);
User_prop_array SYS.AQ$_JMS_USERPROPARRAY;
Agent SYS.AQ$_AGENT;
Header SYS.AQ$_JMS_HEADER;
Message SYS.AQ$_JMS_TEXT_MESSAGE;
Message_text VARCHAR2(500);
BEGIN
Agent := SYS.AQ$_AGENT('',NULL,0);
User_prop_array := SYS.AQ$_JMS_USERPROPARRAY();
Header := SYS.AQ$_JMS_HEADER( Agent, '', 'AQUSER', '', '', '', User_prop_array);
Message_text := 'Message from score engine '|| TO_CHAR(SYSDATE, 'mm/dd/yyyy hh24:mi:ss');
Message := SYS.AQ$_JMS_TEXT_MESSAGE(Header, LENGTH(Message_text), Message_text, NULL);
DBMS_AQ.ENQUEUE(queue_name => 'SCO_QUEUE',
                         Enqueue_options => enqueue_options,
                         Message_properties => message_properties,
                         Payload => message,
                         Msgid => message_handle);
DBMS_OUTPUT.PUT_LINE('Msgid: ' || message_handle);
COMMIT;
END;
JAVA class to receive message
public ScoreController() {
try {
//Connect to AQ (Oracle's JMS provider)
QueueConnectionFactory queueConnectionFactory = AQjmsFactory.getQueueConnectionFactory("dax", "v48DEV",
1521, "thin");
//Create the queue Connection
QueueConnection queueConnection = queueConnectionFactory.createQueueConnection("AQUSER", "AQUSER");
queueConnection.start();
//Create the Topic Session
QueueSession queueSession = queueConnection.createQueueSession(true, Session.CLIENT_ACKNOWLEDGE);
Queue queue = ((AQjmsSession) queueSession).getQueue("AQUSER", "SCO_QUEUE");
//Create a non-durable Subscriber.
QueueReceiver receiver = ((AQjmsSession) queueSession).createReceiver(queue);
//get the next message off the queue
while (true) {
System.out.println("Looking for message ");
TextMessage message = (TextMessage) receiver.receive(1000);
if (message == null) {
System.out.println("Gave up, No message found.");
continue;
} else {
message.acknowledge();
System.out.println("Received request");
System.out.println("\tTime: " + System.currentTimeMillis() + " ms");
System.out.println("\tMessage ID: " + message.getJMSMessageID());
System.out.println("\tCorrel. ID: " + message.getJMSCorrelationID());
System.out.println("\tReply to: " + message.getJMSReplyTo());
System.out.println("\tContents: " + message.getText());
} catch (JMSException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}