[Red Hat JIRA] (WFLY-13051) provide setRemoveOnCancelPolicy on ManagedScheduledExecutorService

Saturday, 2 January 2021

    [
https://issues.redhat.com/browse/WFLY-13051?page=com.atlassian.jira.plugi...
] 

nimo stephan commented on WFLY-13051:
-------------------------------------

Ok I had time to dig into this: The *ManagedScheduledExecutorService ex* can be indeed
cancelled:

{code:java}
ex.cancel(false);{code}
So this works as expected.

By the way, what currently is not supported by the the *ManagedScheduledExecutorService
(*which is an instance of *ScheduledExecutorService)* are the follwoing inherited method:

{code:java}
// Those methods are not supported by ManagedScheduledExecutorService and will throw an
Exception
ex.shutdownNow();
ex.shutdown();
ex.isShutdown();{code}
Having this:
{code:java}
if(scheduler instanceof ScheduledExecutorService) {
 log.info("scheduler instanceof ScheduledExecutorService = true");
// throws Exceptions
 log.infov("scheduler.isShutdown() = {0}", scheduler.isShutdown());
 ScheduledExecutorService impl = (ScheduledExecutorService) scheduler;
// impl.shutdown(); // cannot use this on JEE Envirnoment
 }{code}
Throws this:

{code:java}
FLYEE0110: Failed to run scheduled task: java.lang.IllegalStateException: Lifecycle
operation not supported
 at org.glassfish.javax.enterprise.concurrent
//org.glassfish.enterprise.concurrent.AbstractManagedExecutorServiceAdapter.isShutdown(AbstractManagedExecutorServiceAdapter.java:45)

{code}

...
 provide setRemoveOnCancelPolicy on ManagedScheduledExecutorService
 ------------------------------------------------------------------

                 Key: WFLY-13051
                 URL: https://issues.redhat.com/browse/WFLY-13051
             Project: WildFly
          Issue Type: Enhancement
          Components: Concurrency Utilities
    Affects Versions: 19.0.0.Beta1
            Reporter: nimo stephan
            Assignee: Eduardo Martins
            Priority: Major

 Using 
 {code:java}
 @Resource
 private ManagedScheduledExecutorService executor;
 {code}
 provides no possiblity to setRemoveOnCancelPolicy to true.
 A casting within a method:
 {code:java}
 ((ScheduledThreadPoolExecutor) executor).setRemoveOnCancelPolicy(true);
 {code}
 throws the error:
 {code:java}
 Caused by: javax.ejb.EJBException: java.lang.ClassCastException: class
org.glassfish.enterprise.concurrent.ManagedScheduledExecutorServiceAdapter cannot be cast
to class java.util.concurrent.ScheduledThreadPoolExecutor
(org.glassfish.enterprise.concurrent.ManagedScheduledExecutorServiceAdapter is in unnamed
module of loader 'org.glassfish.javax.enterprise.concurrent' @a93b7af;
java.util.concurrent.ScheduledThreadPoolExecutor is in module java.base of loader
'bootstrap')
 	at
org.jboss.as.ejb3@17.0.1.Final//org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:246)
 	at
org.jboss.as.ejb3@17.0.1.Final//org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:388)
 	at
org.jboss.as.ejb3@17.0.1.Final//org.jboss.as.ejb3.tx.LifecycleCMTTxInterceptor.processInvocation(LifecycleCMTTxInterceptor.java:68)
 {code}
 Please provide option to cast or if not possible to add the property 
 {code:java}
 setRemoveOnCancelPolicy()
 {code}
  within the object ManagedScheduledExecutorService. Because without it, we cannot remove
a task from the queue with "future.cancel(false)". 

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