Advanced Queuing - Oracle

Enqueuing and Dequeuing Of Messages
Enqueuing and Dequeuing of Messages with Time Delay and Expiration Using
PL/SQL
/* Enqueue message for delayed availability: */
DECLARE
enqueue_options dbms_aq.enqueue_options_t;
message_properties dbms_aq.message_properties_t;
message_handle RAW(16);
message aq.Message_typ;
BEGIN
message := Message_typ(’DELAYED’,
’This message is delayed one week.’);
message_properties.delay := 7*24*60*60;
message_properties.expiration := 2*7*24*60*60;
dbms_aq.enqueue(queue_name => ’msg_queue’,
enqueue_options => enqueue_options,
message_properties => message_properties,
payload => message,
msgid => message_handle);
END;
Note: Expiration is calculated from the earliest dequeue time. So,
if an application wants a message to be dequeued no earlier than a
week from now, but no later than 3 weeks from now, this requires
setting the expiration time for 2 weeks. This scenario is described in
the following code segment.
COMMIT;
Oracle Advanced Queuing by Example A-37