Returns a Flow
which outputs all its inputs.
Creates a [Flow] which will use the given function to transform its inputs to outputs.
Creates a [Flow] which will use the given function to transform its inputs to outputs. It is equivalent
to Flow[T].map(f)
A graph with the shape of a flow logically is a flow, this method makes it so also in type.
Creates a Flow from a Reactive Streams org.reactivestreams.Processor
Creates a Flow from a Reactive Streams org.reactivestreams.Processor and returns a materialized value.
Creates a Flow
from a Sink
and a Source
where the Flow's input
will be sent to the Sink and the Flow's output will come from the Source.
Creates a Flow
from a Sink
and a Source
where the Flow's input
will be sent to the Sink and the Flow's output will come from the Source.
The resulting flow can be visualized as:
+----------------------------------------------+ | Resulting Flow[I, O, NotUsed] | | | | +---------+ +-----------+ | | | | | | | I ~~> | Sink[I] | [no-connection!] | Source[O] | ~~> O | | | | | | | +---------+ +-----------+ | +----------------------------------------------+
The completion of the Sink and Source sides of a Flow constructed using
this method are independent. So if the Sink receives a completion signal,
the Source side will remain unaware of that. If you are looking to couple
the termination signals of the two sides use Flow.fromSinkAndSourceCoupled
instead.
See also fromSinkAndSourceMat when access to materialized values of the parameters is needed.
Allows coupling termination (cancellation, completion, erroring) of Sinks and Sources while creating a Flow from them.
Allows coupling termination (cancellation, completion, erroring) of Sinks and Sources while creating a Flow from them. Similar to Flow.fromSinkAndSource however couples the termination of these two stages.
The resulting flow can be visualized as:
+---------------------------------------------+ | Resulting Flow[I, O, NotUsed] | | | | +---------+ +-----------+ | | | | | | | I ~~> | Sink[I] | ~~~(coupled)~~~ | Source[O] | ~~> O | | | | | | | +---------+ +-----------+ | +---------------------------------------------+
E.g. if the emitted Flow gets a cancellation, the Source of course is cancelled, however the Sink will also be completed. The table below illustrates the effects in detail:
Returned Flow | Sink (in ) |
Source (out ) |
---|---|---|
cause: upstream (sink-side) receives completion | effect: receives completion | effect: receives cancel |
cause: upstream (sink-side) receives error | effect: receives error | effect: receives cancel |
cause: downstream (source-side) receives cancel | effect: completes | effect: receives cancel |
effect: cancels upstream, completes downstream | effect: completes | cause: signals complete |
effect: cancels upstream, errors downstream | effect: receives error | cause: signals error or throws |
effect: cancels upstream, completes downstream | cause: cancels | effect: receives cancel |
See also fromSinkAndSourceCoupledMat when access to materialized values of the parameters is needed.
Allows coupling termination (cancellation, completion, erroring) of Sinks and Sources while creating a Flow from them.
Allows coupling termination (cancellation, completion, erroring) of Sinks and Sources while creating a Flow from them. Similar to Flow.fromSinkAndSource however couples the termination of these two stages.
The resulting flow can be visualized as:
+-----------------------------------------------------+ | Resulting Flow[I, O, M] | | | | +-------------+ +---------------+ | | | | | | | I ~~> | Sink[I, M1] | ~~~(coupled)~~~ | Source[O, M2] | ~~> O | | | | | | | +-------------+ +---------------+ | +-----------------------------------------------------+
E.g. if the emitted Flow gets a cancellation, the Source of course is cancelled, however the Sink will also be completed. The table on Flow.fromSinkAndSourceCoupled illustrates the effects in detail.
The combine
function is used to compose the materialized values of the sink
and source
into the materialized value of the resulting Flow.
Creates a Flow
from a Sink
and a Source
where the Flow's input
will be sent to the Sink and the Flow's output will come from the Source.
Creates a Flow
from a Sink
and a Source
where the Flow's input
will be sent to the Sink and the Flow's output will come from the Source.
The resulting flow can be visualized as:
+-------------------------------------------------------+ | Resulting Flow[I, O, M] | | | | +-------------+ +---------------+ | | | | | | | I ~~> | Sink[I, M1] | [no-connection!] | Source[O, M2] | ~~> O | | | | | | | +-------------+ +---------------+ | +------------------------------------------------------+
The completion of the Sink and Source sides of a Flow constructed using
this method are independent. So if the Sink receives a completion signal,
the Source side will remain unaware of that. If you are looking to couple
the termination signals of the two sides use Flow.fromSinkAndSourceCoupledMat
instead.
The combine
function is used to compose the materialized values of the sink
and source
into the materialized value of the resulting Flow.