Package play.libs.streams

Class ActorFlow

java.lang.Object

play.libs.streams.ActorFlow

public class ActorFlow
extends Object

Provides a flow that is handled by an actor.

See https://github.com/akka/akka/issues/16985.

Constructor Summary

Constructors

Constructor	Description
ActorFlow()

Method Summary

Modifier and Type	Method	Description
static <In, Out> Flow<In,Out,?>	actorRef(Function<ActorRef,Props> props, int bufferSize, OverflowStrategy overflowStrategy, ActorRefFactory factory, Materializer mat)	Create a flow that is handled by an actor.
static <In, Out> Flow<In,Out,?>	actorRef(Function<ActorRef,Props> props, ActorRefFactory factory, Materializer mat)	Create a flow that is handled by an actor.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ActorFlow

public ActorFlow()

Method Details

actorRef

public static <In,
Out> Flow<In,Out,?> actorRef(Function<ActorRef,Props> props,
 int bufferSize,
 OverflowStrategy overflowStrategy,
 ActorRefFactory factory,
 Materializer mat)

Create a flow that is handled by an actor.

Messages can be sent downstream by sending them to the actor passed into the props function. This actor meets the contract of the actor returned by Source.actorRef(org.apache.pekko.japi.function.Function<java.lang.Object, java.util.Optional<org.apache.pekko.stream.CompletionStrategy>>, org.apache.pekko.japi.function.Function<java.lang.Object, java.util.Optional<java.lang.Throwable>>, int, org.apache.pekko.stream.OverflowStrategy).

The props function should return the props for an actor to handle the flow. This actor will be created using the passed in ActorRefFactory. Each message received will be sent to the actor - there is no back pressure, if the actor is unable to process the messages, they will queue up in the actors mailbox. The upstream can be cancelled by the actor terminating itself.

Type Parameters:

In - the In type parameter for a Flow

Out - the Out type parameter for a Flow

Parameters:

props - A function that creates the props for actor to handle the flow.

bufferSize - The maximum number of elements to buffer.

overflowStrategy - The strategy for how to handle a buffer overflow.

factory - The Actor Factory used to create the actor to handle the flow - for example, an ActorSystem.

mat - The materializer to materialize the flow.

Returns:

the flow itself.

actorRef

public static <In,
Out> Flow<In,Out,?> actorRef(Function<ActorRef,Props> props,
 ActorRefFactory factory,
 Materializer mat)

Create a flow that is handled by an actor.

Messages can be sent downstream by sending them to the actor passed into the props function. This actor meets the contract of the actor returned by Source.actorRef(org.apache.pekko.japi.function.Function<java.lang.Object, java.util.Optional<org.apache.pekko.stream.CompletionStrategy>>, org.apache.pekko.japi.function.Function<java.lang.Object, java.util.Optional<java.lang.Throwable>>, int, org.apache.pekko.stream.OverflowStrategy), defaulting to a buffer size of 16, and failing the stream if the buffer gets full.

The props function should return the props for an actor to handle the flow. This actor will be created using the passed in ActorRefFactory. Each message received will be sent to the actor - there is no back pressure, if the actor is unable to process the messages, they will queue up in the actors mailbox. The upstream can be cancelled by the actor terminating itself.

Type Parameters:

In - the In type parameter for a Flow

Out - the Out type parameter for a Flow

Parameters:

props - A function that creates the props for actor to handle the flow.

factory - The Actor Factory used to create the actor to handle the flow - for example, an ActorSystem.

mat - The materializer to materialize the flow.

Returns:

the flow itself.