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

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: Edson Tirelli 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