Extend CronScheduledRoutePolicy

[Burkard Stephan <St...@visana.ch>]

Hi 

I configured a route with CronScheduledRoutePolicy to stop every afternoon at 6pm and start the following morning again at 4am (because a downstream system is not available). Works fine so far.

Now, what if my component is deployed at 8pm? The route starts, the cron trigger is already passed.

I found this old thread where my problem is discussed: 
http://camel.465427.n5.nabble.com/CronScheduledRoutePolicy-td4552324.html



I took the same road to solve this "edge case": I set the route to ".noAutoStart()" and quickly tried to extend CronScheduledRoutePolicy. 

In the onInit method I retrieve the configured start and stop triggers, compare their next fire dates and decide if the route should be started or not. [At the moment I leave suspend and resume triggers aside]

But now, how can I start the route if needed? The consumer is still null at this time. 

Am I in the wrong method to do this? 
Or can I use ".autoStartup(bool)", set it by default to false and somehow set the flag to true at this early stage? 



I even found an event-notifier-solution in this answer on SO:
https://stackoverflow.com/a/21759153/8035582

Is this the best way to go? To subscribe to CamelContextStart and start the route if needed? Or is this a too "expensive" solution? 
Probably isEnabled(EventObject eventObject) could be used to filter the Event types to subscribe to.



Thanks for any hints
Stephan