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Usage of Executors.newSingleThreadScheduledExecutor

Answer 1

+3 A:

It means that you cannot add additional threads to this executor after it has been created. It is guaranteed to have only one thread.

This is useful when want to ensure that only a single background task is active at any given time in your application. Mostly useful when you will be providing a reference to this executor to potentially untrusted code (code written by someone other than you).

Gerco Dries 2010-01-18 12:30:56

I'm sorry, I still do not understand. Does this mean, for instance, an active thread may not instantiate and activate another thread ?

Everyone 2010-01-18 13:15:20

No, it means exactly what it says. The *Executor* will *never* use more than one thread. What this thread does is of no concern to the `Executor`.

Bombe 2010-01-18 14:08:38

As Bombe is saying. The tasks the Executor runs are capable of doing whatever they like. They can create more threads if they want to. The Executor simply guarantees that it will not use more than one thread for running tasks.

Gerco Dries 2010-01-18 15:09:08

Answer 2

+1 A:

It means, that if you share the Executor, without worying that some piece of code reconfigures the Executor to use 23 Threads and thereby killing your machine.

Jens Schauder 2010-01-18 12:31:35

Answer 3

+2 A:

I guess it means that only one thread is processing the tasks, and there is no way to add more threads after the creation

Maurice Perry 2010-01-18 12:31:45

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Usage of Executors.newSingleThreadScheduledExecutor

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