jakarta ee - Start & Stop a ScheduledExecutorService in Java EE environment using servlet

Question

We have a requirement where in we need to monitor remote JVM details via JMX using a simple servlet application. So things done till now in a standalone application is

1) Creat a JMX connector & get the Memory data --> done 2) We need to constantly monitor & get the records (2.1 > which can be considered as scheduled task at constant delay & insert the records into DB Or 2.2> does the JMX gives the history if yes which MBean to access for the info?).

Here I am planning to use an interface to register the domain , followed to it. Have start & stop button from JSP. The functionality been when we click start the system will run the scheduler (ScheduledExecutorService ) & capture the records at background to give the history. When the uses clicks stop the scheduler has to stop the background process. The question is how can we control & get the object of a scheduler ?

1) In other words how can we start & stop a ScheduledExecutorService via servlets ? start a thread from one servlet & stop a thread from another servlet for a particular task ?

2) What if we have a clustered/load balanced environment ?

Currently am thinking of adding each ScheduledExecutorService into HashMap , key been the task object & value been the ScheduledExecutorService using SingleTon desgin pattern. Is there any default approach. The loop whole with SingleTon is in clustered/load balanced environment we may not be able to get the appropriate update objects.

Looking forward for your valuable suggestion.

Answer 1

If on java ee 7, try using the javax.enterprise.concurrent.ManagedScheduledExecutorService

Then you can do a resource injection and start the task with code similiar to below.

@Resource
ManagedScheduledExecutorService mses;

public void startTask() {
    mses.scheduleAtFixedRate(runnable, 10, 10, SECONDS);
}

In Java EE 6 you could have a servlet create/remove using the timerservice API