July 2017
Intermediate to advanced
466 pages
11h 24m
English
Content preview from Java 9 Programming Blueprints
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Concurrent Java with a Future interface
One of the more common and popular APIs is the Future<V> interface. Future is a means to encapsulate an asynchronous calculation. Typically, the Future instance is returned by ExecutorService, which we'll discuss later. The calling code, once it has the reference to Future, can continue to work on other tasks while Future runs in the background in another thread. When the caller is ready for the results of Future, it calls Future.get(). If Future has finished its work, the call returns immediately with the results. If, however, Future is still working, calls to get() will block until Future completes.
For our uses, though, Future isn't the most appropriate choice. Looking over the non-functional requirements, ...
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