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#19440 replace Scala Future usage with CompletionStage in javadsl

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This entails:

  * adding akka.pattern.PatternCS.* to enable ask etc. with
    CompletionStage
  * changing RequestContext to offer an ExecutionContextExecutor for the
    CompletionStage.*Async combinators
  * splitting up akka.stream.Queue for JavaDSL consistency
This commit is contained in:
Roland Kuhn 2016-01-21 16:37:26 +01:00
parent 396f4370e9
commit 4c72495581
118 changed files with 1646 additions and 1379 deletions
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19
akka-docs/rst/java/stream/migration-guide-2.0-2.4-java.rst
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@ -7,6 +7,25 @@ Migration Guide 2.0.x to 2.4.x
General notes
=============
Java DSL now uses Java 8 types: CompletionStage and Optional
------------------------------------------------------------
In order to provide a top-notch Java API we switched from Scala’s Future and Akka’s
``akka.japi.Option`` interim solutions to the JDK’s own types for deferred computation
and optional results. This has been done throughout Streams & HTTP, most notably changing most
materialized types, but also the signature of the ``mapAsync`` combinator and the
asynchronous route result combinators in the HTTP DSL.
The ``akka.pattern`` package has been updated with a new set of implementations within
the ``PatternCS`` class that provide the ability to interact between Actors and Futures
(or streams) for ``CompletionStage``.
Should you have the need to use Scala Futures with these new Java APIs please use
the ``scala-java8-compat`` library that comes as a dependency of Akka. For more
information see `the documentation``_.
.. _`the documentation`:: https://github.com/scala/scala-java8-compat
akka.Done and akka.NotUsed replacing Unit and BoxedUnit
-------------------------------------------------------