How to create multiple ManagedScheduledExecutorService resources in Jaxrs - jax-rs

Question

I'm developing a service using WebSphere Liberty (wlp) and JAX-RS.
I want to run multiple schedulers in my service to do different tasks periodically.
I have installed concurrent-1.0 feature and defined an instance of
#Resource(name ="DefaultManagedScheduledExecutorService")
private ManagedScheduledExecutorService myScheduler;
in my init class which implements ServletContextListener
How I can create some more instances in some other classes?
I can find pointers for ManagedExecutorService like:
http://www.adam-bien.com/roller/abien/entry/injecting_an_executorservice_with_java
I have tried same with ManagedScheduledExecutorService but it didn't work.
But I'm unable to get much info for ManagedScheduledExecutorService resource.
Please provide any links or pointers which could be useful here.

Answer 1

The injection example you have currently is making use of the Default ManagedScheduledExecutorService which is available once you turn on the concurrent-1.0 feature.
To configure additional ManagedScheduledExecutorService's, you can simply define more in your server.xml configuration like this:
<managedScheduledExecutorService jndiName="concurrent/exec1"/>
<managedScheduledExecutorService jndiName="concurrent/exec2"/>
<managedScheduledExecutorService jndiName="concurrent/exec3"/>
However, there is really no reason you should need additional ManagedScheduledExecutorService's unless they are going to have different context service configurations applied for different tasks. For example:
<managedScheduledExecutorService jndiName="concurrent/classloaderExec">
<contextService>
<classloaderContext/>
</contextService>
</managedScheduledExecutorService>
<managedScheduledExecutorService jndiName="concurrent/jeeMetadataExec">
<contextService>
<jeeMetadataContext/>
</contextService>
</managedScheduledExecutorService>
If you simply want to schedule different tasks, say myHourlyTask and myDailyTask, you can still do that with the same ManagedScheduledExecutorService resource:
myScheduler.scheduleAtFixedRate(myHourlyTask, 0, 1, TimeUnit.HOURS);
myScheduler.scheduleAtFixedRate(myDailyTask, 0, 1, TimeUnit.DAYS);
To declare and use ManagedScheduledExecutorService default resource instance in any non-resource class:
/** The scheduler. */
private ManagedScheduledExecutorService monkeyScheduler;
try {
monkeyScheduler = (ManagedScheduledExecutorService)
new InitialContext().lookup("java:comp/DefaultManagedScheduledExecutorService");
} catch (NamingException e) {
e.printStackTrace();
}

Answer 2

Check this page Configuring managed scheduled executors for details how to configure managed executor.
You should be able to use one executor, just call multiple executor.schedule* methods for your different tasks.