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!str #17090 add AsyncStage

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Roland Kuhn 2015-04-09 22:28:16 +02:00
parent ad3829cd74
commit 4c623fade7
66 changed files with 981 additions and 787 deletions
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akka-docs-dev/rst/java/stream-integrations.rst
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@ -130,9 +130,10 @@ Finally, sending the emails:
``mapAsync`` is applying the given function that is calling out to the external service to
each of the elements as they pass through this processing step. The function returns a :class:`Future`
and the value of that future will be emitted downstreams. As many futures as requested elements by
downstream may run in parallel and may complete in any order, but the elements that
are emitted downstream are in the same order as received from upstream.
and the value of that future will be emitted downstreams. The number of Futures
that shall run in parallel is given as the first argument to ``mapAsync``.
These Futures may complete in any order, but the elements that are emitted
downstream are in the same order as received from upstream.
That means that back-pressure works as expected. For example if the ``emailServer.send``
is the bottleneck it will limit the rate at which incoming tweets are retrieved and