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Java 9 Concurrency Cookbook, Second Edition
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The Java API provides the FutureTask
class as a cancelable asynchronous computation. It implements the Runnable
and Future
interfaces and provides the basic implementation of the Future
interface. We can create a FutureTask
class using a Callable
or Runnable
object (Runnable
objects doesn't return a result, so we have to pass as parameter too in this case the result that the Future
object will return). It provides methods to cancel the execution and obtain the result of the computation. It also provides a method called done()
that allows you to execute some code after the finalization of a task executed in an executor. It can be used to make some postprocess operations, such as generating a report, sending results by e-mail, or releasing some resources. This method is called internally by the FutureTask
class when the execution of the task that this FutureTask
object is controlling finishes. The method is called after the result of the task is...