1.2 KiB
1.2 KiB
Scheduled Messages
Scheduled messages differ from normal messages in that they won't be delivered until a specified time in the future, at the earliest.
To do this, a special property is set on the message before sending it.
Scheduled Delivery Property
The property name used to identify a scheduled message is
"_HQ_SCHED_DELIVERY" (or the constant
Message.HDR_SCHEDULED_DELIVERY_TIME).
The specified value must be a positive long corresponding to the time
the message must be delivered (in milliseconds). An example of sending a
scheduled message using the JMS API is as follows.
TextMessage message = session.createTextMessage("This is a scheduled message message which will be delivered in 5 sec.");
message.setLongProperty("_HQ_SCHED_DELIVERY", System.currentTimeMillis() + 5000);
producer.send(message);
...
// message will not be received immediately but 5 seconds later
TextMessage messageReceived = (TextMessage) consumer.receive();
Scheduled messages can also be sent using the core API, by setting the same property on the core message before sending.
Example
See ? for an example which shows how scheduled messages can be used with JMS.