[jboss-jira] [JBoss JIRA] (JBRULES-3663) Use a common thread pool for all TimerJobInstances

[Sebastian Calbaza (JIRA)]

Sebastian Calbaza created JBRULES-3663:
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             Summary: Use a common thread pool for all TimerJobInstances
                 Key: JBRULES-3663
                 URL: https://issues.jboss.org/browse/JBRULES-3663
             Project: Drools
          Issue Type: Enhancement
      Security Level: Public (Everyone can see)
            Reporter: Sebastian Calbaza
            Assignee: Mark Proctor


>From what I've seen(correct me if I'm wrong) there is, for each StatefulKnowledgeSession a TimeManager -> JDKTimerService  instances pair that use a ScheduledThreadPoolExecutor of size one(default) for scheduling timer job instances.
Now the issues that I see are:
  * not optimal resource utilization in case of large number of sessions 
  * number of sessions bounded by available memory for threads
  * some performance penalty for concurrent jobs (I say some because all session ops are serial)

I provided also a PR with to be reviewed



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