How to tell ScheduledExecutorService to ignore overlapping executions after resuming computer from suspension/hibernation

Question

I've got a thread in charge of periodically refreshing some remote service queries response cache every 10-15 minutes.

The problem is when a client's machine resumes from sleep the refresh task executes sleep time / refresh period times instead of just once.

It's not overloading the server or anything, but it is inefficient. How can I prevent this from happening?

score 3 · Accepted Answer · edited May 23 '17 at 12:21

3

Assuming the task is scheduled at a fixed rate via the ScheduledExecutorService, change the task to a self-scheduling task. In this manner there is always only 1 task waiting to be executed.

edited May 23 '17 at 12:21

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answered Apr 24 '15 at 15:14

vanOekel

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I had forgotten about this question, but yes; this is what I ended up doing. It is good to have some confirmation though, because I haven't got a lot of experience on this, and I was worried that scheduling this way could be a bad practice (something like: what if there is an abnormal termination I didn't account for, like not enough resources to execute the update thread, and the next update doesn't get scheduled?), and so I thought that maybe the standard practice was something different I wasn't finding anywhere because I didn't have a name for it. – NotGaeL Apr 25 '15 at 14:24

How to tell ScheduledExecutorService to ignore overlapping executions after resuming computer from suspension/hibernation

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