Java Materializer类代码示例

import akka.stream.Materializer; //导入依赖的package包/类
public static void main(String[] args) {
    final ActorSystem system = ActorSystem.create("KafkaProducerSystem");

    final Materializer materializer = ActorMaterializer.create(system);

    final ProducerSettings<byte[], String> producerSettings =
            ProducerSettings
                    .create(system, new ByteArraySerializer(), new StringSerializer())
                    .withBootstrapServers("localhost:9092");

    CompletionStage<Done> done =
            Source.range(1, 100)
                    .map(n -> n.toString())
                    .map(elem ->
                            new ProducerRecord<byte[], String>(
                                    "topic1-ts",
                                    0,
                                    Instant.now().getEpochSecond(),
                                    null,
                                    elem))
                    .runWith(Producer.plainSink(producerSettings), materializer);

    done.whenComplete((d, ex) -> System.out.println("sent"));
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Test
public void testReactiveStream() throws InterruptedException, TimeoutException {
    final ActorSystem system =
            ActorSystem.create("MySystem");

    final Materializer mat =
            ActorMaterializer.create(system);

    Source<Integer, NotUsed> source = Source.range(1, 5);

    Flow<Integer, Integer, NotUsed> flow = Flow
            .fromFunction(x -> x + 1);

    Source<Integer, NotUsed> source2 = source.via(flow);

    Sink<Integer, CompletionStage<Integer>> fold =
            Sink.<Integer, Integer>fold(0, (next, total) -> total + next);

    CompletionStage<Integer> integerCompletionStage = source2.runWith(fold, mat);
    integerCompletionStage.thenAccept(System.out::println);
    Thread.sleep(3000);
    Await.ready(system.terminate(), Duration.apply(10, TimeUnit.SECONDS));
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Test
public void testReactiveStreamRefined() throws InterruptedException, TimeoutException {
    final ActorSystem system =
            ActorSystem.create("MySystem");

    final Materializer mat =
            ActorMaterializer.create(system);

    Source<Integer, NotUsed> source = Source.range(1, 5).map(x -> x + 1)
            .fold(0, (next, total) -> total + next);

    CompletionStage<Integer> integerCompletionStage =
            source.runWith(Sink.head(), mat);

    integerCompletionStage.thenAccept(System.out::println);
    Thread.sleep(3000);
    Await.ready(system.terminate(), Duration.apply(10, TimeUnit.SECONDS));
}
 

import akka.stream.Materializer; //导入依赖的package包/类
/**
 * Starts a DataCenterForwarder for each of the known data centers in the {@link DataCenterRepository}.
 * @param system Actor system to create the DataCenterForwarder actors in
 * @param dataRepo Repository that knows about all data centers
 * @param materializer Akka streams materializer to use
 * @param visibilityRepo Repository that stores the current visiblity of aggregates
 * @param eventRepo Classifier that determines which additional datacenters an event should trigger replication for
 * @param eventsByTagQuery Query to use to find a continuous stream of all events
 * @param tag Tag to pass to {@link EventsByTagQuery} (all events must be tagged by this)
 * @param currentEventsByPersistenceIdQuery Query to find all current events for a specific persistenceId
 */
public static <E> void startAll(ActorSystem system, Materializer materializer, DataCenterRepository dataRepo, VisibilityRepository visibilityRepo, Class<E> eventType,
    EventsByTagQuery eventsByTagQuery, CurrentEventsByPersistenceIdQuery currentEventsByPersistenceIdQuery) {
    
    String tag = Replication.get(system).getEventTag(eventType);
    for (DataCenter dataCenter: dataRepo.getRemotes().values()) {
        system.actorOf(ClusterSingletonManager.props(
            BackoffSupervisor.props(
                Backoff.onFailure(
                    Props.create(DataCenterForwarder.class, () -> new DataCenterForwarder<>(materializer, dataCenter, visibilityRepo, eventType,
                        eventsByTagQuery, currentEventsByPersistenceIdQuery)),
                    "f",
                    Duration.create(1, TimeUnit.SECONDS),
                    Duration.create(1, TimeUnit.SECONDS), // TODO make these 3 configurable
                    0.2)
            ),
            Done.getInstance(),
            ClusterSingletonManagerSettings.create(system).withSingletonName("s")), "forwarder_" + dataCenter.getName() + "_" + tag);
    }
    
}
 

import akka.stream.Materializer; //导入依赖的package包/类
/**
   * Creates a new DataCenterForwarder and starts to forward events to a data center.
   * @param materializer Akka streams materializer to use
   * @param dataCenter Target data center to forward events to.
   * @param visibilityRepo Repository that stores the current visiblity of aggregates
   * @param eventRepo Classifier that determines which additional datacenters an event should trigger replication for
   * @param eventsByTagQuery Query to use to find a continuous stream of all events
   * @param tag Tag to pass to {@link EventsByTagQuery} (all events must be tagged by this)
   * @param currentEventsByPersistenceIdQuery Query to find all current events for a specific persistenceId
   */
  public DataCenterForwarder(Materializer materializer, DataCenter dataCenter, VisibilityRepository visibilityRepo, Class<E> eventType,
      EventsByTagQuery eventsByTagQuery, CurrentEventsByPersistenceIdQuery currentEventsByPersistenceIdQuery) {
      
final Replication replication = Replication.get(context().system());
      
this.eventsByTagQuery = eventsByTagQuery;
      this.materializer = materializer;
      this.visibilityRepo = visibilityRepo;
      this.classifier = replication.getEventClassifier(eventType);
      this.dataCenter = dataCenter;
      this.tag = replication.getEventTag(eventType);
      this.localDataCenterName = replication.getLocalDataCenterName();
      this.currentEventsByPersistenceIdQuery = currentEventsByPersistenceIdQuery;
      this.parallelism = context().system().settings().config().getInt("ts-reaktive.replication.parallellism");

      pipe(visibilityRepo.getLastEventOffset(dataCenter, tag).thenApply(LastEventOffsetKnown::new), context().dispatcher()).to(self());
      log.debug("Started");
  }
 

import akka.stream.Materializer; //导入依赖的package包/类
public CompletableFuture<Done> importAll() {
    
    AtomicLong batch = new AtomicLong(0);
    long start = System.currentTimeMillis();
    
    final Materializer materializer = ActorMaterializer.create(ActorSystem.create("actor-system", ConfigFactory.load()));
    Source<Page, NotUsed> channelSource = Source.fromIterator(() -> reader);
    
    Flow<Page, List<Page>, NotUsed> processing = Flow.of(Page.class)
                                                     .filter(x -> x != null && x.getNamespace() == 0)
                                                     .buffer(cores * 100, OverflowStrategy.backpressure())
                                                     .mapAsyncUnordered(cores, x -> cleaner.clean(x))
                                                     .groupedWithin(BATCH_SIZE,
                                                                    FiniteDuration.apply(1, TimeUnit.SECONDS))
                                                     .mapAsyncUnordered(cores, x -> datastore.save(x));
    
    final CompletionStage<Done> promise = channelSource.via(processing).runForeach(x -> {
        
        System.out.printf("Inserted: %d, Time: %d sec\n",
                          batch.incrementAndGet() * BATCH_SIZE,
                          (System.currentTimeMillis() - start) / 1000);
    }, materializer);
    
    return promise.toCompletableFuture();
    
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public HomeController(ActorSystem actorSystem,
                      Materializer mat,
                      WebJarAssets webJarAssets) {
    org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(this.getClass());
    LoggingAdapter logging = Logging.getLogger(actorSystem.eventStream(), logger.getName());

    //noinspection unchecked
    Source<String, Sink<String, NotUsed>> source = MergeHub.of(String.class)
            .log("source", logging)
            .recoverWithRetries(-1, new PFBuilder().match(Throwable.class, e -> Source.empty()).build());
    Sink<String, Source<String, NotUsed>> sink = BroadcastHub.of(String.class);

    Pair<Sink<String, NotUsed>, Source<String, NotUsed>> sinkSourcePair = source.toMat(sink, Keep.both()).run(mat);
    Sink<String, NotUsed> chatSink = sinkSourcePair.first();
    Source<String, NotUsed> chatSource = sinkSourcePair.second();
    this.userFlow = Flow.fromSinkAndSource(chatSink, chatSource).log("userFlow", logging);

    this.webJarAssets = webJarAssets;
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public HomeController(ActorSystem actorSystem,
                      Materializer mat) {
    org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(this.getClass());
    LoggingAdapter logging = Logging.getLogger(actorSystem.eventStream(), logger.getName());

    //noinspection unchecked
    Source<String, Sink<String, NotUsed>> source = MergeHub.of(String.class)
            .log("source", logging)
            .recoverWithRetries(-1, new PFBuilder().match(Throwable.class, e -> Source.empty()).build());
    Sink<String, Source<String, NotUsed>> sink = BroadcastHub.of(String.class);

    Pair<Sink<String, NotUsed>, Source<String, NotUsed>> sinkSourcePair = source.toMat(sink, Keep.both()).run(mat);
    Sink<String, NotUsed> chatSink = sinkSourcePair.first();
    Source<String, NotUsed> chatSource = sinkSourcePair.second();
    this.userFlow = Flow.fromSinkAndSource(chatSink, chatSource).log("userFlow", logging);
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public HomeController(ActorSystem actorSystem,
                      Materializer mat,
                      WebJarsUtil webJarsUtil) {
    org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(this.getClass());
    LoggingAdapter logging = Logging.getLogger(actorSystem.eventStream(), logger.getName());

    //noinspection unchecked
    Source<String, Sink<String, NotUsed>> source = MergeHub.of(String.class)
            .log("source", logging)
            .recoverWithRetries(-1, new PFBuilder().match(Throwable.class, e -> Source.empty()).build());
    Sink<String, Source<String, NotUsed>> sink = BroadcastHub.of(String.class);

    Pair<Sink<String, NotUsed>, Source<String, NotUsed>> sinkSourcePair = source.toMat(sink, Keep.both()).run(mat);
    Sink<String, NotUsed> chatSink = sinkSourcePair.first();
    Source<String, NotUsed> chatSource = sinkSourcePair.second();
    this.userFlow = Flow.fromSinkAndSource(chatSink, chatSource).log("userFlow", logging);

    this.webJarsUtil = webJarsUtil;
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public UserActor(@Assisted String id,
                 @Named("stocksActor") ActorRef stocksActor,
                 Materializer mat) {
    this.id = id;
    this.stocksActor = stocksActor;
    this.mat = mat;

    Pair<Sink<JsonNode, NotUsed>, Source<JsonNode, NotUsed>> sinkSourcePair =
            MergeHub.of(JsonNode.class, 16)
            .toMat(BroadcastHub.of(JsonNode.class, 256), Keep.both())
            .run(mat);

    this.hubSink = sinkSourcePair.first();
    Source<JsonNode, NotUsed> hubSource = sinkSourcePair.second();

    Sink<JsonNode, CompletionStage<Done>> jsonSink = Sink.foreach((JsonNode json) -> {
        // When the user types in a stock in the upper right corner, this is triggered,
        String symbol = json.findPath("symbol").asText();
        addStocks(Collections.singleton(symbol));
    });

    // Put the source and sink together to make a flow of hub source as output (aggregating all
    // stocks as JSON to the browser) and the actor as the sink (receiving any JSON messages
    // from the browse), using a coupled sink and source.
    this.websocketFlow = Flow.fromSinkAndSourceCoupled(jsonSink, hubSource)
            //.log("actorWebsocketFlow", logger)
            .watchTermination((n, stage) -> {
                // When the flow shuts down, make sure this actor also stops.
                stage.thenAccept(f -> context().stop(self()));
                return NotUsed.getInstance();
            });
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public AuthorizationFilter(
    Materializer mat,
    IClientAuthConfig config,
    IJwtValidation jwtValidation) {
    super(mat);
    this.authRequired = config.isAuthRequired();
    this.jwtValidation = jwtValidation;
}
 

import akka.stream.Materializer; //导入依赖的package包/类
private void run1() {
    final ActorSystem actorSystem = ActorSystem.create();
    final Materializer materializer = ActorMaterializer.create(actorSystem);
    final Source<Integer, NotUsed> source = Source.range(0, 10);
    final Flow<Integer, String, NotUsed> flow = Flow.fromFunction((Integer i) -> i.toString());
    final Sink<String, CompletionStage<Done>> sink = Sink.foreach(s -> System.out.println("Example1 - Number: " + s));
    final RunnableGraph runnable = source.via(flow).to(sink);
    runnable.run(materializer);
    actorSystem.terminate();
}
 

import akka.stream.Materializer; //导入依赖的package包/类
private void run2() {
    final ActorSystem actorSystem = ActorSystem.create();
    final Materializer materializer = ActorMaterializer.create(actorSystem);
    Source.range(0, 10)
            .map(Object::toString)
            .runForeach(s -> System.out.println("Example 2 - Number: " + s), materializer);
    actorSystem.terminate();
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public Routes(Application application,
        Assets assets, WebJarAssets webJars, Materializer materializer) {
    this.application = application;
    this.assets = assets;
    this.webJars = webJars;
    this.materializer = materializer;

    this.router = buildRouter();
}
 

import akka.stream.Materializer; //导入依赖的package包/类
@Inject
public LoadTestServiceImpl(FriendService friendService, ActivityStreamService activityService,
    ChirpService chirpService, Materializer materializer) {
  this.friendService = friendService;
  this.activityService = activityService;
  this.chirpService = chirpService;
  this.materializer = materializer;
}