Getting started with Google Guava (Community Experience Distilled) by Bill Bejeck

Author:Bill Bejeck [Bejeck, Bill]
Language: eng
Format: epub
Publisher: Packt Publishing
Published: 2013-08-13T16:00:00+00:00

In our example here, we are submitting a Callable object to the ExecutorService instance. The ExecutorService instance immediately returns the Future object; however, that does not imply the task is done. To retrieve the result, we call future.get(), which may block if the task is not completed. The ListenableFuture interface extends the Future interface by allowing us to register a callback to be executed automatically once the submitted task is completed. We accomplish this by calling the ListenableFuture.addListener method that takes a Runnable instance and an ExecutorService object, which could be the same Executor instance the original task was submitted to or another ExecutorService instance entirely.

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