@Test
public void partialGraph() throws Exception {
// #partial-graph
final Graph<FlowShape<Integer, Integer>, NotUsed> partial =
GraphDSL.create(
builder -> {
final UniformFanOutShape<Integer, Integer> B = builder.add(Broadcast.create(2));
final UniformFanInShape<Integer, Integer> C = builder.add(Merge.create(2));
final UniformFanOutShape<Integer, Integer> E = builder.add(Balance.create(2));
final UniformFanInShape<Integer, Integer> F = builder.add(Merge.create(2));
builder.from(F.out()).toInlet(C.in(0));
builder.from(B).viaFanIn(C).toFanIn(F);
builder
.from(B)
.via(builder.add(Flow.of(Integer.class).map(i -> i + 1)))
.viaFanOut(E)
.toFanIn(F);
return new FlowShape<Integer, Integer>(B.in(), E.out(1));
});
// #partial-graph
// #partial-use
Source.single(0).via(partial).to(Sink.ignore());
// #partial-use
// #partial-flow-dsl
// Convert the partial graph of FlowShape to a Flow to get
// access to the fluid DSL (for example to be able to call .filter())
final Flow<Integer, Integer, NotUsed> flow = Flow.fromGraph(partial);
// Simple way to create a graph backed Source
final Source<Integer, NotUsed> source =
Source.fromGraph(
GraphDSL.create(
builder -> {
final UniformFanInShape<Integer, Integer> merge = builder.add(Merge.create(2));
builder.from(builder.add(Source.single(0))).toFanIn(merge);
builder.from(builder.add(Source.from(Arrays.asList(2, 3, 4)))).toFanIn(merge);
// Exposing exactly one output port
return new SourceShape<Integer>(merge.out());
}));
// Building a Sink with a nested Flow, using the fluid DSL
final Sink<Integer, NotUsed> sink =
Flow.of(Integer.class).map(i -> i * 2).drop(10).named("nestedFlow").to(Sink.head());
// Putting all together
final RunnableGraph<NotUsed> closed = source.via(flow.filter(i -> i > 1)).to(sink);
// #partial-flow-dsl
}
@Test
public void demonstrateBroadcast() {
final Sink<Author, CompletionStage<Done>> writeAuthors = Sink.ignore();
final Sink<Hashtag, CompletionStage<Done>> writeHashtags = Sink.ignore();
// #flow-graph-broadcast
RunnableGraph.fromGraph(
GraphDSL.create(
b -> {
final UniformFanOutShape<Tweet, Tweet> bcast = b.add(Broadcast.create(2));
final FlowShape<Tweet, Author> toAuthor =
b.add(Flow.of(Tweet.class).map(t -> t.author));
final FlowShape<Tweet, Hashtag> toTags =
b.add(
Flow.of(Tweet.class)
.mapConcat(t -> new ArrayList<Hashtag>(t.hashtags())));
final SinkShape<Author> authors = b.add(writeAuthors);
final SinkShape<Hashtag> hashtags = b.add(writeHashtags);
b.from(b.add(tweets)).viaFanOut(bcast).via(toAuthor).to(authors);
b.from(bcast).via(toTags).to(hashtags);
return ClosedShape.getInstance();
}))
.run(mat);
// #flow-graph-broadcast
}
@Test
public void complexGraph() throws Exception {
// #complex-graph
RunnableGraph.fromGraph(
GraphDSL.create(
builder -> {
final Outlet<Integer> A = builder.add(Source.single(0)).out();
final UniformFanOutShape<Integer, Integer> B = builder.add(Broadcast.create(2));
final UniformFanInShape<Integer, Integer> C = builder.add(Merge.create(2));
final FlowShape<Integer, Integer> D =
builder.add(Flow.of(Integer.class).map(i -> i + 1));
final UniformFanOutShape<Integer, Integer> E = builder.add(Balance.create(2));
final UniformFanInShape<Integer, Integer> F = builder.add(Merge.create(2));
final Inlet<Integer> G = builder.add(Sink.<Integer>foreach(System.out::println)).in();
builder.from(F).toFanIn(C);
builder.from(A).viaFanOut(B).viaFanIn(C).toFanIn(F);
builder.from(B).via(D).viaFanOut(E).toFanIn(F);
builder.from(E).toInlet(G);
return ClosedShape.getInstance();
}));
// #complex-graph
// #complex-graph-alt
RunnableGraph.fromGraph(
GraphDSL.create(
builder -> {
final SourceShape<Integer> A = builder.add(Source.single(0));
final UniformFanOutShape<Integer, Integer> B = builder.add(Broadcast.create(2));
final UniformFanInShape<Integer, Integer> C = builder.add(Merge.create(2));
final FlowShape<Integer, Integer> D =
builder.add(Flow.of(Integer.class).map(i -> i + 1));
final UniformFanOutShape<Integer, Integer> E = builder.add(Balance.create(2));
final UniformFanInShape<Integer, Integer> F = builder.add(Merge.create(2));
final SinkShape<Integer> G = builder.add(Sink.foreach(System.out::println));
builder.from(F.out()).toInlet(C.in(0));
builder.from(A).toInlet(B.in());
builder.from(B.out(0)).toInlet(C.in(1));
builder.from(C.out()).toInlet(F.in(0));
builder.from(B.out(1)).via(D).toInlet(E.in());
builder.from(E.out(0)).toInlet(F.in(1));
builder.from(E.out(1)).to(G);
return ClosedShape.getInstance();
}));
// #complex-graph-alt
}
@Test
public void closedGraph() throws Exception {
// #embed-closed
final RunnableGraph<NotUsed> closed1 = Source.single(0).to(Sink.foreach(System.out::println));
final RunnableGraph<NotUsed> closed2 =
RunnableGraph.fromGraph(
GraphDSL.create(
builder -> {
final ClosedShape embeddedClosed = builder.add(closed1);
return embeddedClosed; // Could return ClosedShape.getInstance()
}));
// #embed-closed
}
// #worker-pool
public static <In, Out> Flow<In, Out, BoxedUnit> balancer(
Flow<In, Out, BoxedUnit> worker, int workerCount) {
return Flow.fromGraph(
GraphDSL.create(
b -> {
boolean waitForAllDownstreams = true;
final UniformFanOutShape<In, In> balance =
b.add(Balance.<In>create(workerCount, waitForAllDownstreams));
final UniformFanInShape<Out, Out> merge = b.add(Merge.<Out>create(workerCount));
for (int i = 0; i < workerCount; i++) {
b.from(balance.out(i)).via(b.add(worker)).toInlet(merge.in(i));
}
return FlowShape.of(balance.in(), merge.out());
}));
}
public static void main(String[] args) {
Outlet<Integer> outlet = null;
Outlet<Integer> outlet1 = null;
Outlet<Integer> outlet2 = null;
Inlet<Integer> inlet = null;
Inlet<Integer> inlet1 = null;
Inlet<Integer> inlet2 = null;
Flow<Integer, Integer, BoxedUnit> flow = Flow.of(Integer.class);
Flow<Integer, Integer, BoxedUnit> flow1 = Flow.of(Integer.class);
Flow<Integer, Integer, BoxedUnit> flow2 = Flow.of(Integer.class);
Promise<Option<Integer>> promise = null;
{
Graph<SourceShape<Integer>, BoxedUnit> graphSource = null;
Graph<SinkShape<Integer>, BoxedUnit> graphSink = null;
Graph<FlowShape<Integer, Integer>, BoxedUnit> graphFlow = null;
// #flow-wrap
Source<Integer, BoxedUnit> source = Source.fromGraph(graphSource);
Sink<Integer, BoxedUnit> sink = Sink.fromGraph(graphSink);
Flow<Integer, Integer, BoxedUnit> aflow = Flow.fromGraph(graphFlow);
Flow.fromSinkAndSource(Sink.<Integer>head(), Source.single(0));
Flow.fromSinkAndSourceMat(Sink.<Integer>head(), Source.single(0), Keep.left());
// #flow-wrap
Graph<BidiShape<Integer, Integer, Integer, Integer>, BoxedUnit> bidiGraph = null;
// #bidi-wrap
BidiFlow<Integer, Integer, Integer, Integer, BoxedUnit> bidiFlow =
BidiFlow.fromGraph(bidiGraph);
BidiFlow.fromFlows(flow1, flow2);
BidiFlow.fromFlowsMat(flow1, flow2, Keep.both());
// #bidi-wrap
}
{
// #graph-create
GraphDSL.create(
builder -> {
// ...
return ClosedShape.getInstance();
});
GraphDSL.create(
builder -> {
// ...
return new FlowShape<>(inlet, outlet);
});
// #graph-create
}
{
// #graph-create-2
GraphDSL.create(
builder -> {
// ...
return SourceShape.of(outlet);
});
GraphDSL.create(
builder -> {
// ...
return SinkShape.of(inlet);
});
GraphDSL.create(
builder -> {
// ...
return FlowShape.of(inlet, outlet);
});
GraphDSL.create(
builder -> {
// ...
return BidiShape.of(inlet1, outlet1, inlet2, outlet2);
});
// #graph-create-2
}
{
// #graph-builder
GraphDSL.create(
builder -> {
builder.from(outlet).toInlet(inlet);
builder.from(outlet).via(builder.add(flow)).toInlet(inlet);
builder.from(builder.add(Source.single(0))).to(builder.add(Sink.head()));
// ...
return ClosedShape.getInstance();
});
// #graph-builder
}
// #source-creators
Source<Integer, Promise<Option<Integer>>> src = Source.<Integer>maybe();
// Complete the promise with an empty option to emulate the old lazyEmpty
promise.trySuccess(scala.Option.empty());
final Source<String, Cancellable> ticks =
Source.tick(
FiniteDuration.create(0, TimeUnit.MILLISECONDS),
FiniteDuration.create(200, TimeUnit.MILLISECONDS),
"tick");
final Source<Integer, BoxedUnit> pubSource =
Source.fromPublisher(TestPublisher.<Integer>manualProbe(true, sys));
final Source<Integer, BoxedUnit> futSource = Source.fromFuture(Futures.successful(42));
final Source<Integer, Subscriber<Integer>> subSource = Source.<Integer>asSubscriber();
// #source-creators
// #sink-creators
final Sink<Integer, BoxedUnit> subSink =
Sink.fromSubscriber(TestSubscriber.<Integer>manualProbe(sys));
// #sink-creators
// #sink-as-publisher
final Sink<Integer, Publisher<Integer>> pubSink = Sink.<Integer>asPublisher(false);
final Sink<Integer, Publisher<Integer>> pubSinkFanout = Sink.<Integer>asPublisher(true);
// #sink-as-publisher
// #empty-flow
Flow<Integer, Integer, BoxedUnit> emptyFlow = Flow.<Integer>create();
// or
Flow<Integer, Integer, BoxedUnit> emptyFlow2 = Flow.of(Integer.class);
// #empty-flow
// #flatMapConcat
Flow.<Source<Integer, BoxedUnit>>create()
.<Integer, BoxedUnit>flatMapConcat(
new Function<Source<Integer, BoxedUnit>, Source<Integer, BoxedUnit>>() {
@Override
public Source<Integer, BoxedUnit> apply(Source<Integer, BoxedUnit> param)
throws Exception {
return param;
}
});
// #flatMapConcat
Uri uri = null;
// #raw-query
final akka.japi.Option<String> theRawQueryString = uri.rawQueryString();
// #raw-query
// #query-param
final akka.japi.Option<String> aQueryParam = uri.query().get("a");
// #query-param
// #file-source-sink
final Source<ByteString, Future<Long>> fileSrc = FileIO.fromFile(new File("."));
final Source<ByteString, Future<Long>> otherFileSrc = FileIO.fromFile(new File("."), 1024);
final Sink<ByteString, Future<Long>> fileSink = FileIO.toFile(new File("."));
// #file-source-sink
// #input-output-stream-source-sink
final Source<ByteString, Future<java.lang.Long>> inputStreamSrc =
StreamConverters.fromInputStream(
new Creator<InputStream>() {
public InputStream create() {
return new SomeInputStream();
}
});
final Source<ByteString, Future<java.lang.Long>> otherInputStreamSrc =
StreamConverters.fromInputStream(
new Creator<InputStream>() {
public InputStream create() {
return new SomeInputStream();
}
},
1024);
final Sink<ByteString, Future<java.lang.Long>> outputStreamSink =
StreamConverters.fromOutputStream(
new Creator<OutputStream>() {
public OutputStream create() {
return new SomeOutputStream();
}
});
// #input-output-stream-source-sink
// #output-input-stream-source-sink
final FiniteDuration timeout = FiniteDuration.Zero();
final Source<ByteString, OutputStream> outputStreamSrc = StreamConverters.asOutputStream();
final Source<ByteString, OutputStream> otherOutputStreamSrc =
StreamConverters.asOutputStream(timeout);
final Sink<ByteString, InputStream> someInputStreamSink = StreamConverters.asInputStream();
final Sink<ByteString, InputStream> someOtherInputStreamSink =
StreamConverters.asInputStream(timeout);
// #output-input-stream-source-sink
}