Apache Camel - Triggering a task on startup to run only once

Question

I am working on a Java project using Camel & Spring. We would like to trigger an initialize method on a singleton bean after Spring finished doing its thing and Camel has finished building all routes.

We cant call the method at class creation time as it has dynamic linkings to other classes that it picks up from the @Component spring annotation and we dont know when/if these classes have been loaded yet to actually run the init method as part of a constructor.

How can I go about invoking a method or methods to run only once right after Camel startup is complete?

Thanks!

Answer 1

another simple option which gives you a little more flexibility is to use camel-timer with a repeatCount=1 and a delay value long enough to let everything initialize. you can also add basic exception handling to delay/retry, etc...

from("timer://runOnce?repeatCount=1&delay=5000").to("bean:runOnceBean");

Answer 2

If the bean must be invoked after CamelContext has started all the routes etc, then you can as Ben suggest use a route with a timer.

A possible better alternative is to use the EventNotifier API from Camel. And then invoke the logic on the CamelContextStartedEvent being fired. Some details on the EventNotifier API here: http://camel.apache.org/eventnotifier-to-log-details-about-all-sent-exchanges.html