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Patrik Nordwall 2011-12-15 23:43:04 +01:00
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akka-docs/java/futures.rst
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@ -11,7 +11,6 @@ Introduction
------------
In Akka, a `Future <http://en.wikipedia.org/wiki/Futures_and_promises>`_ is a data structure used to retrieve the result of some concurrent operation. This operation is usually performed by an ``Actor`` or by the ``Dispatcher`` directly. This result can be accessed synchronously (blocking) or asynchronously (non-blocking).
Asynchronous usage is strongly recommended.
Use with Actors
---------------
@ -23,7 +22,8 @@ Using the ``ActorRef``\'s ``ask`` method to send a message will return a Future.
.. includecode:: code/akka/docs/future/FutureDocTestBase.java
:include: imports1,ask-blocking
This will cause the current thread to block and wait for the ``UntypedActor`` to 'complete' the ``Future`` with it's reply. Blocking is discouraged though as it can cause performance problem. Alternatives to blocking are discussed further within this documentation.
This will cause the current thread to block and wait for the ``UntypedActor`` to 'complete' the ``Future`` with it's reply. Blocking is discouraged though as it can cause performance problem.
The blocking operations are located in ``Await.result`` and ``Await.ready`` to make it easy to spot where blocking occurs. Alternatives to blocking are discussed further within this documentation.
Also note that the ``Future`` returned by an ``UntypedActor`` is a ``Future<Object>`` since an ``UntypedActor`` is dynamic. That is why the cast to ``String`` is used in the above sample.
Use Directly