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!str #19005 make groupBy et al return a SubFlow

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A SubFlow (or SubSource) is not a Graph, it is an unfinished builder
that accepts transformations. This allows us to capture the substreams’
transformations before materializing the flow, which will be very
helpful in fully fusing all operators.

Another change is that groupBy now requires a maxSubstreams parameter in
order to bound its resource usage. In exchange the matching merge can be
unbounded. This trades silent deadlock for explicit stream failure.

This commit also changes all uses of Predef.identity to use `conforms`
and removes the HTTP impl.util.identityFunc.
This commit is contained in:
Roland Kuhn 2015-11-25 19:58:48 +01:00
parent 654fa41443
commit 1500d1f36d
56 changed files with 3484 additions and 720 deletions
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4
akka-docs-dev/rst/scala/stream-flows-and-basics.rst
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@ -235,8 +235,8 @@ resulting values. Some examples of using these combiners are illustrated in the
.. includecode:: code/docs/stream/FlowDocSpec.scala#flow-mat-combine
.. note::
In Graphs it is possible to access the materialized value from inside the stream processing graph. For details see
:ref:`graph-matvalue-scala`
In Graphs it is possible to access the materialized value from inside the stream processing graph. For details see :ref:`graph-matvalue-scala`.
Stream ordering
===============