Delayer

The Delayer Pattern allows you to delay the delivery of messages to some destination.

Using the Fluent Builders

from("seda:a").delayer(header("JMSTimestamp"), 3000).to("mock:result");

So the above example will delay all messages received on queue:a until the JMSTimestamp plus 3 seconds before sending them to mock:result.

You can of course use many different Expression languages such as XPath, XQuery, SQL or various Scripting Languages. You can just delay things a fixed amount of time from the point at which the delayer receives the message. For example to delay things 2 seconds

delayer(2000)

The above assume that the delivery order is maintained and that the messages are delivered in delay order. If you want to reorder the messages based on delivery time, you can use the Resequencer with this pattern. For example

from("activemq:someQueue").resequencer(header("MyDeliveryTime")).delay("MyRedeliveryTime").to("activemq:aDelayedQueue");

For further examples of this pattern in use you could look at the junit test case

Using the Spring XML Extensions

Using This Pattern

If you would like to use this EIP Pattern then please read the Getting Started, you may also find the Architecture useful particularly the description of Endpoint and URIs. Then you could try out some of the Examples first before trying this pattern out.

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