Differences between submit, execute, schedule
Hi All,
I have a my own ScheduledTaskExecutor that extends ScheduledThreadPoolExecutor and I have some methods to schedule some tasks in order to run it at fixed period and this work without issues.
Now I have to force the execution of an already scheduled task when an event occurs (actually I'm forcing it via JMX, but this is not the point).
I have seen in the ScheduledThreadPoolExecutor documentation some useful methods:
- submit
- execute
- schedule
Well, the difference between submit and execute is the returned value, but what is the difference between submit(task) and schedule(task, 0, TimeUnit.MILLISECONDS) ?
Basically what I image is:
I have a queue (blocking queue) of tasks, and every task is scheduled with its own period. When I want, I should take this task, cancel its scheduled execution, execute it using execute/submit/schedule, and then re-schedule it for periodic execution.
Another issue...the task could be running when the event for one-shot execution occurs....how can i know if a task is running ? I can do it in my task class (setting its status to something like RUNNING) but I'm wondering if there is not a way to know the status using the (Scheduled)Future.
thanks a lot
Ste
