本文整理了Java中akka.stream.javadsl.Flow
类的一些代码示例,展示了Flow
类的具体用法。这些代码示例主要来源于Github
/Stackoverflow
/Maven
等平台,是从一些精选项目中提取出来的代码,具有较强的参考意义,能在一定程度帮忙到你。Flow
类的具体详情如下:
包路径:akka.stream.javadsl.Flow
类名称:Flow
暂无
代码示例来源:origin: com.typesafe.play/play_2.12
return splitter.via(Flow.fromGraph(GraphDSL.<FlowShape<F.Either<FlowIn, Out>, Out>>create(builder -> {
UniformFanInShape<Out, Out> merge = builder.add(mergeStrategy);
Flow<F.Either<FlowIn, Out>, FlowIn, ?> collectIn = Flow.<F.Either<FlowIn, Out>>create().collect(Scala.partialFunction(x -> {
if (x.left.isPresent()) {
return x.left.get();
Flow<F.Either<FlowIn, Out>, Out, ?> collectOut = Flow.<F.Either<FlowIn, Out>>create().collect(Scala.partialFunction(x -> {
if (x.right.isPresent()) {
return x.right.get();
代码示例来源:origin: com.typesafe.play/play_2.12
@Override
public CompletionStage<F.Either<Result, Flow<Message, Message, ?>>> apply(Http.RequestHeader request) {
return f.apply(request).thenApply(resultOrFlow -> {
if (resultOrFlow.left.isPresent()) {
return F.Either.Left(resultOrFlow.left.get());
} else {
Flow<Message, Message, ?> flow = AkkaStreams.bypassWith(
Flow.<Message>create().collect(inMapper),
play.api.libs.streams.AkkaStreams.onlyFirstCanFinishMerge(2),
resultOrFlow.right.get().map(outMapper::apply)
);
return F.Either.Right(flow);
}
});
}
};
代码示例来源:origin: com.typesafe.play/play_2.12
@Override
public Accumulator<ByteString, F.Either<Result, A>> apply(Http.RequestHeader request) {
Flow<ByteString, ByteString, Future<MaxSizeStatus>> takeUpToFlow = Flow.fromGraph(play.api.mvc.BodyParsers$.MODULE$.takeUpTo(maxLength));
Sink<ByteString, CompletionStage<F.Either<Result, A>>> result = apply1(request).toSink();
return Accumulator.fromSink(takeUpToFlow.toMat(result, (statusFuture, resultFuture) ->
FutureConverters.toJava(statusFuture).thenCompose(status -> {
if (status instanceof MaxSizeNotExceeded$) {
return resultFuture;
} else {
return errorHandler.onClientError(request, Status$.MODULE$.REQUEST_ENTITY_TOO_LARGE(), "Request entity too large")
.thenApply(F.Either::<Result, A>Left);
}
})
));
}
代码示例来源:origin: com.typesafe.play/play_2.12
/**
* Bypass the given flow using the given splitter function.
* <p>
* If the splitter function returns Left, they will go through the flow. If it returns Right, they will bypass the
* flow.
* <p>
* Uses onlyFirstCanFinishMerge(2) by default.
*
* @param <In> the In type parameter for Flow
* @param <FlowIn> the FlowIn type parameter for the left branch in Either.
* @param <Out> the Out type parameter for Flow
* @param flow the original flow
* @param splitter the splitter function to use
*
* @return the flow with a bypass.
*/
public static <In, FlowIn, Out> Flow<In, Out, ?> bypassWith(Function<In, F.Either<FlowIn, Out>> splitter,
Flow<FlowIn, Out, ?> flow) {
return bypassWith(Flow.<In>create().map(splitter::apply),
play.api.libs.streams.AkkaStreams.onlyFirstCanFinishMerge(2), flow);
}
代码示例来源:origin: com.typesafe.play/play-java_2.11
/**
* Produces a Flow of escaped ByteString from a series of String elements. Calls
* out to Comet.flow internally.
*
* @param callbackName the javascript callback method.
* @return a flow of ByteString elements.
*/
public static Flow<String, ByteString, NotUsed> string(String callbackName) {
return Flow.of(String.class).map(str -> {
return ByteString.fromString("'" + StringEscapeUtils.escapeEcmaScript(str) + "'");
}).via(flow(callbackName));
}
代码示例来源:origin: org.eclipse.ditto/ditto-services-utils-akka
/**
* Chain a collection of flows one after another.
*
* @param flows collection of flows.
* @param <A> type of messages through the flows.
* @return joined flow.
*/
public static <A> Graph<FlowShape<A, A>, NotUsed> joinFlows(
final Collection<Graph<FlowShape<A, A>, NotUsed>> flows) {
Flow<A, A, NotUsed> overallFlow = Flow.create();
for (Graph<FlowShape<A, A>, NotUsed> flow : flows) {
overallFlow = overallFlow.via(flow);
}
return overallFlow;
}
}
代码示例来源:origin: eclipse/ditto
private Sink<Message, NotUsed> createSink(final Integer version, final String connectionCorrelationId,
final AuthorizationContext connectionAuthContext, final DittoHeaders additionalHeaders,
final ProtocolAdapter adapter) {
return Flow.<Message>create()
.filter(Message::isText)
.map(Message::asTextMessage)
.map(textMsg -> {
if (textMsg.isStrict()) {
return Source.single(textMsg.getStrictText());
} else {
return textMsg.getStreamedText();
}
})
.flatMapConcat(textMsg -> textMsg.<String>fold("", (str1, str2) -> str1 + str2))
.via(Flow.fromFunction(result -> {
LogUtil.logWithCorrelationId(LOGGER, connectionCorrelationId, logger ->
logger.debug("Received incoming WebSocket message: {}", result));
return result;
}))
.withAttributes(Attributes.createLogLevels(Logging.DebugLevel(), Logging.DebugLevel(),
Logging.WarningLevel()))
.filter(strictText -> processProtocolMessage(connectionAuthContext, connectionCorrelationId,
strictText))
.map(buildSignal(version, connectionCorrelationId, connectionAuthContext, additionalHeaders, adapter))
.to(Sink.actorSubscriber(
CommandSubscriber.props(streamingActor, subscriberBackpressureQueueSize, eventStream)));
}
代码示例来源:origin: com.typesafe.play/play-java
/**
* Produces a flow of ByteString with a prepended block and a script wrapper.
*
* @param callbackName the javascript callback method.
* @return a flow of ByteString elements.
*/
public static Flow<ByteString, ByteString, NotUsed> flow(String callbackName) {
ByteString cb = ByteString.fromString(callbackName);
return Flow.of(ByteString.class).map((msg) -> {
return formatted(cb, msg);
}).prepend(Source.single(initialChunk));
}
代码示例来源:origin: wxyyxc1992/Backend-Boilerplates
/**
* A handler that treats incoming messages as a name,
* and responds with a greeting to that name
*/
public static Flow<Message, Message, NotUsed> greeter() {
return
Flow.<Message>create()
.collect(new JavaPartialFunction<Message, Message>() {
@Override
public Message apply(Message msg, boolean isCheck) throws Exception {
if (isCheck) {
if (msg.isText()) {
return null;
} else {
throw noMatch();
}
} else {
return handleTextMessage(msg.asTextMessage());
}
}
});
}
代码示例来源:origin: eclipse/ditto
/**
* Create a processing unit from a function.
*
* @param self reference to the actor carrying the pre-enforcement.
* @param processor function to call.
* @return Akka stream graph.
*/
static Graph<FlowShape<WithSender, WithSender>, NotUsed> fromFunction(
@Nullable final ActorRef self,
final Function<WithDittoHeaders, CompletionStage<WithDittoHeaders>> processor) {
final Attributes logLevels =
Attributes.createLogLevels(Logging.DebugLevel(), Logging.DebugLevel(), Logging.ErrorLevel());
final Flow<WithSender<WithDittoHeaders>, WithSender, NotUsed> flow =
Flow.<WithSender<WithDittoHeaders>>create()
.mapAsync(1, wrapped -> {
final Supplier<CompletionStage<Object>> futureSupplier = () ->
processor.apply(wrapped.getMessage())
.<Object>thenApply(result -> WithSender.of(result, wrapped.getSender()));
return handleErrorNowOrLater(futureSupplier, wrapped, self);
})
.log("PreEnforcer")
.withAttributes(logLevels)
.flatMapConcat(PreEnforcer::keepResultAndLogErrors);
return Pipe.joinUnhandledSink(
Pipe.joinFilteredFlow(Filter.of(WithDittoHeaders.class), flow), unhandled());
}
代码示例来源:origin: com.typesafe.play/play-java_2.12
/**
* @return a flow of EventSource.Event to ByteString.
*/
public static Flow<EventSource.Event, ByteString, ?> flow() {
Flow<Event, Event, NotUsed> flow = Flow.of(Event.class);
return flow.map((EventSource.Event event) -> ByteString.fromString(event.formatted()));
}
代码示例来源:origin: eclipse/ditto
/**
* Create an activity checker if duration is not null and a pipe otherwise.
*
* @param interval how often to check for activity.
* @param self reference to the actor.
* @param <A> type of messages that prevents actor termination.
* @return an activity checker.
*/
public static <A> Graph<FlowShape<A, A>, NotUsed> ofNullable(@Nullable final Duration interval,
final ActorRef self) {
return interval == null ? Flow.create() : of(interval, self);
}
代码示例来源:origin: lagom/lagom-recipes
@Inject
public StreamSubscriber(HelloService helloService, StreamRepository repository) {
// Create a subscriber
helloService.helloEvents().subscribe()
// And subscribe to it with at least once processing semantics.
.atLeastOnce(
// Create a flow that emits a Done for each message it processes
Flow.<HelloEvent>create().mapAsync(1, event -> {
if (event instanceof HelloEvent.GreetingMessageChanged) {
HelloEvent.GreetingMessageChanged messageChanged = (HelloEvent.GreetingMessageChanged) event;
// Update the message
return repository.updateMessage(messageChanged.getName(), messageChanged.getMessage());
} else {
// Ignore all other events
return CompletableFuture.completedFuture(Done.getInstance());
}
})
);
}
}
代码示例来源:origin: com.typesafe.play/play-streams_2.11
public <D> Accumulator<D, A> through(Flow<D, E, ?> flow) {
return new SinkAccumulator<>(flow.toMat(toSink, Keep.right()));
}
代码示例来源:origin: org.eclipse.ditto/ditto-services-thingsearch-updater-actors
private static Flow<Boolean, Boolean, NotUsed> stopTimer(final StartedTimer timer) {
return Flow.fromFunction(foo -> {
timer.stop(); // stop timer
return foo;
});
}
代码示例来源:origin: com.typesafe.play/play-java_2.11
/**
* Produces a flow of ByteString using `Json.stringify` from a Flow of JsonNode. Calls
* out to Comet.flow internally.
*
* @param callbackName the javascript callback method.
* @return a flow of ByteString elements.
*/
public static Flow<JsonNode, ByteString, NotUsed> json(String callbackName) {
return Flow.of(JsonNode.class).map(json -> {
return ByteString.fromString(Json.stringify(json));
}).via(flow(callbackName));
}
代码示例来源:origin: eclipse/ditto
/**
* Chain a collection of flows one after another.
*
* @param flows collection of flows.
* @param <A> type of messages through the flows.
* @return joined flow.
*/
public static <A> Graph<FlowShape<A, A>, NotUsed> joinFlows(
final Collection<Graph<FlowShape<A, A>, NotUsed>> flows) {
Flow<A, A, NotUsed> overallFlow = Flow.create();
for (Graph<FlowShape<A, A>, NotUsed> flow : flows) {
overallFlow = overallFlow.via(flow);
}
return overallFlow;
}
}
代码示例来源:origin: com.typesafe.play/play_2.11
/**
* Bypass the given flow using the given splitter function.
* <p>
* If the splitter function returns Left, they will go through the flow. If it returns Right, they will bypass the
* flow.
* <p>
* Uses onlyFirstCanFinishMerge(2) by default.
*
* @param <In> the In type parameter for Flow
* @param <FlowIn> the FlowIn type parameter for the left branch in Either.
* @param <Out> the Out type parameter for Flow
* @param flow the original flow
* @param splitter the splitter function to use
*
* @return the flow with a bypass.
*/
public static <In, FlowIn, Out> Flow<In, Out, ?> bypassWith(Function<In, F.Either<FlowIn, Out>> splitter,
Flow<FlowIn, Out, ?> flow) {
return bypassWith(Flow.<In>create().map(splitter::apply),
play.api.libs.streams.AkkaStreams.onlyFirstCanFinishMerge(2), flow);
}
代码示例来源:origin: com.typesafe.play/play-java_2.12
/**
* Produces a flow of ByteString with a prepended block and a script wrapper.
*
* @param callbackName the javascript callback method.
* @return a flow of ByteString elements.
*/
public static Flow<ByteString, ByteString, NotUsed> flow(String callbackName) {
ByteString cb = ByteString.fromString(callbackName);
return Flow.of(ByteString.class).map((msg) -> {
return formatted(cb, msg);
}).prepend(Source.single(initialChunk));
}
代码示例来源:origin: com.typesafe.play/play-java_2.11
/**
* @return a flow of EventSource.Event to ByteString.
*/
public static Flow<EventSource.Event, ByteString, ?> flow() {
Flow<Event, Event, NotUsed> flow = Flow.of(Event.class);
return flow.map((EventSource.Event event) -> ByteString.fromString(event.formatted()));
}
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