Re: [rules-users] Drools Flow: waiting for process to complete without polling
java.util.concurrent.CountDownLatch, if you have java 1.5 available. You have to know the
number of processes you're waiting on first, though. The javadoc for CountDownLatch
has a usage example. A CyclicBarrier could do the same thing repeatedly. (CountDownLatch
is single use.)
----- Original Message ----
From: Alexandros Karypidis <akarypid(a)yahoo.gr>
To: Rules Users List <rules-users(a)lists.jboss.org>
Sent: Tuesday, September 29, 2009 7:01:56 PM
Subject: [rules-users] Drools Flow: waiting for process to complete without polling
Hello,
I'm not very experienced in the Drools Flow API so I'm looking into the
best way to code a simple thing: wait for all processes in a session to
complete without polling.
The only way I could thing of from the javadoc reference I read, is to
synchronize and do a wait()/notify() using a ProcessEventListener. It
seems a lot of work for a use-case that is too basic. I set up a
listener like this:
pel = new ProcessEventListener() {
// ...
public void afterProcessCompleted(ProcessCompletedEvent pce) {
synchronized (this) {
notifyAll();
}
}
}
ksession.addEventListener(pel);
...then wait for processes (one in this simplified case) to complete
like this:
synchronized (pel) {
new Thread(new Runnable() {
public void run() {
ksession.fireUntilHalt();
}
}).start();
ksession.startProcess("some.process");
pel.wait(); // the notifyAll() resumes this
}
Is there a better way to do this?
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