Example usage for java.util.concurrent CompletableFuture CompletableFuture

Introduction

In this page you can find the example usage for java.util.concurrent CompletableFuture CompletableFuture.

Prototype

public CompletableFuture() 

Source Link

Document

Creates a new incomplete CompletableFuture.

Usage

From source file:playground.Application.java

public static void main(String[] args) throws Exception {

    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext("playground");
    DispatcherHandler dispatcherHandler = new DispatcherHandler();
    dispatcherHandler.setApplicationContext(context);

    HttpServer server = new ReactorHttpServer();
    server.setPort(8080);//from  ww  w  .j av a  2  s.c  o  m
    server.setHandler(dispatcherHandler);
    server.afterPropertiesSet();
    server.start();

    CompletableFuture<Void> stop = new CompletableFuture<>();
    Runtime.getRuntime().addShutdownHook(new Thread(() -> {
        stop.complete(null);
    }));

    synchronized (stop) {
        stop.wait();
    }

}

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From source file:playground.app.Application.java

public static void main(String[] args) throws Exception {

    HttpHandler httpHandler = createHttpHandler();

    HttpServer server = new TomcatHttpServer();
    server.setPort(8080);/*  w  w w . j av a  2 s .  com*/
    server.setHandler(httpHandler);
    server.afterPropertiesSet();
    server.start();

    CompletableFuture<Void> stop = new CompletableFuture<>();
    Runtime.getRuntime().addShutdownHook(new Thread(() -> {
        stop.complete(null);
    }));
    synchronized (stop) {
        stop.wait();
    }
}

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From source file:org.apache.pulsar.testclient.ManagedLedgerWriter.java

public static void main(String[] args) throws Exception {

    final Arguments arguments = new Arguments();
    JCommander jc = new JCommander(arguments);
    jc.setProgramName("pulsar-perf-producer");

    try {//from   ww  w.j a  v a  2  s .c om
        jc.parse(args);
    } catch (ParameterException e) {
        System.out.println(e.getMessage());
        jc.usage();
        System.exit(-1);
    }

    if (arguments.help) {
        jc.usage();
        System.exit(-1);
    }

    arguments.testTime = TimeUnit.SECONDS.toMillis(arguments.testTime);

    // Dump config variables
    ObjectMapper m = new ObjectMapper();
    ObjectWriter w = m.writerWithDefaultPrettyPrinter();
    log.info("Starting Pulsar managed-ledger perf writer with config: {}", w.writeValueAsString(arguments));

    byte[] payloadData = new byte[arguments.msgSize];
    ByteBuf payloadBuffer = PooledByteBufAllocator.DEFAULT.directBuffer(arguments.msgSize);
    payloadBuffer.writerIndex(arguments.msgSize);

    // Now processing command line arguments
    String managedLedgerPrefix = "test-" + DigestUtils.sha1Hex(UUID.randomUUID().toString()).substring(0, 5);

    ClientConfiguration bkConf = new ClientConfiguration();
    bkConf.setUseV2WireProtocol(true);
    bkConf.setAddEntryTimeout(30);
    bkConf.setReadEntryTimeout(30);
    bkConf.setThrottleValue(0);
    bkConf.setNumChannelsPerBookie(arguments.maxConnections);
    bkConf.setZkServers(arguments.zookeeperServers);

    ManagedLedgerFactoryConfig mlFactoryConf = new ManagedLedgerFactoryConfig();
    mlFactoryConf.setMaxCacheSize(0);
    ManagedLedgerFactory factory = new ManagedLedgerFactoryImpl(bkConf, mlFactoryConf);

    ManagedLedgerConfig mlConf = new ManagedLedgerConfig();
    mlConf.setEnsembleSize(arguments.ensembleSize);
    mlConf.setWriteQuorumSize(arguments.writeQuorum);
    mlConf.setAckQuorumSize(arguments.ackQuorum);
    mlConf.setMinimumRolloverTime(10, TimeUnit.MINUTES);
    mlConf.setMetadataEnsembleSize(arguments.ensembleSize);
    mlConf.setMetadataWriteQuorumSize(arguments.writeQuorum);
    mlConf.setMetadataAckQuorumSize(arguments.ackQuorum);
    mlConf.setDigestType(arguments.digestType);
    mlConf.setMaxSizePerLedgerMb(2048);

    List<CompletableFuture<ManagedLedger>> futures = new ArrayList<>();

    for (int i = 0; i < arguments.numManagedLedgers; i++) {
        String name = String.format("%s-%03d", managedLedgerPrefix, i);
        CompletableFuture<ManagedLedger> future = new CompletableFuture<>();
        futures.add(future);
        factory.asyncOpen(name, mlConf, new OpenLedgerCallback() {

            @Override
            public void openLedgerComplete(ManagedLedger ledger, Object ctx) {
                future.complete(ledger);
            }

            @Override
            public void openLedgerFailed(ManagedLedgerException exception, Object ctx) {
                future.completeExceptionally(exception);
            }
        }, null);
    }

    List<ManagedLedger> managedLedgers = futures.stream().map(CompletableFuture::join)
            .collect(Collectors.toList());

    log.info("Created {} managed ledgers", managedLedgers.size());

    Runtime.getRuntime().addShutdownHook(new Thread() {
        public void run() {
            printAggregatedStats();
        }
    });

    Collections.shuffle(managedLedgers);
    AtomicBoolean isDone = new AtomicBoolean();

    List<List<ManagedLedger>> managedLedgersPerThread = Lists.partition(managedLedgers,
            Math.max(1, managedLedgers.size() / arguments.numThreads));

    for (int i = 0; i < arguments.numThreads; i++) {
        List<ManagedLedger> managedLedgersForThisThread = managedLedgersPerThread.get(i);
        int nunManagedLedgersForThisThread = managedLedgersForThisThread.size();
        long numMessagesForThisThread = arguments.numMessages / arguments.numThreads;
        int maxOutstandingForThisThread = arguments.maxOutstanding;

        executor.submit(() -> {
            try {
                final double msgRate = arguments.msgRate / (double) arguments.numThreads;
                final RateLimiter rateLimiter = RateLimiter.create(msgRate);

                // Acquire 1 sec worth of messages to have a slower ramp-up
                rateLimiter.acquire((int) msgRate);
                final long startTime = System.currentTimeMillis();

                final Semaphore semaphore = new Semaphore(maxOutstandingForThisThread);

                final AddEntryCallback addEntryCallback = new AddEntryCallback() {
                    @Override
                    public void addComplete(Position position, Object ctx) {
                        long sendTime = (Long) (ctx);
                        messagesSent.increment();
                        bytesSent.add(payloadData.length);

                        long latencyMicros = NANOSECONDS.toMicros(System.nanoTime() - sendTime);
                        recorder.recordValue(latencyMicros);
                        cumulativeRecorder.recordValue(latencyMicros);

                        semaphore.release();
                    }

                    @Override
                    public void addFailed(ManagedLedgerException exception, Object ctx) {
                        log.warn("Write error on message", exception);
                        System.exit(-1);
                    }
                };

                // Send messages on all topics/producers
                long totalSent = 0;
                while (true) {
                    for (int j = 0; j < nunManagedLedgersForThisThread; j++) {
                        if (arguments.testTime > 0) {
                            if (System.currentTimeMillis() - startTime > arguments.testTime) {
                                log.info("------------------- DONE -----------------------");
                                printAggregatedStats();
                                isDone.set(true);
                                Thread.sleep(5000);
                                System.exit(0);
                            }
                        }

                        if (numMessagesForThisThread > 0) {
                            if (totalSent++ >= numMessagesForThisThread) {
                                log.info("------------------- DONE -----------------------");
                                printAggregatedStats();
                                isDone.set(true);
                                Thread.sleep(5000);
                                System.exit(0);
                            }
                        }

                        semaphore.acquire();
                        rateLimiter.acquire();

                        final long sendTime = System.nanoTime();
                        managedLedgersForThisThread.get(j).asyncAddEntry(payloadBuffer, addEntryCallback,
                                sendTime);
                    }
                }
            } catch (Throwable t) {
                log.error("Got error", t);
            }
        });
    }

    // Print report stats
    long oldTime = System.nanoTime();

    Histogram reportHistogram = null;

    while (true) {
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            break;
        }

        if (isDone.get()) {
            break;
        }

        long now = System.nanoTime();
        double elapsed = (now - oldTime) / 1e9;

        double rate = messagesSent.sumThenReset() / elapsed;
        double throughput = bytesSent.sumThenReset() / elapsed / 1024 / 1024 * 8;

        reportHistogram = recorder.getIntervalHistogram(reportHistogram);

        log.info(
                "Throughput produced: {}  msg/s --- {} Mbit/s --- Latency: mean: {} ms - med: {} - 95pct: {} - 99pct: {} - 99.9pct: {} - 99.99pct: {} - Max: {}",
                throughputFormat.format(rate), throughputFormat.format(throughput),
                dec.format(reportHistogram.getMean() / 1000.0),
                dec.format(reportHistogram.getValueAtPercentile(50) / 1000.0),
                dec.format(reportHistogram.getValueAtPercentile(95) / 1000.0),
                dec.format(reportHistogram.getValueAtPercentile(99) / 1000.0),
                dec.format(reportHistogram.getValueAtPercentile(99.9) / 1000.0),
                dec.format(reportHistogram.getValueAtPercentile(99.99) / 1000.0),
                dec.format(reportHistogram.getMaxValue() / 1000.0));

        reportHistogram.reset();

        oldTime = now;
    }

    factory.shutdown();
}

---

From source file:Main.java

public static <T> CompletableFuture<T> anyOfFutures(List<? extends CompletableFuture<? extends T>> futures) {
    CompletableFuture<T> cf = new CompletableFuture<>();
    CompletableFuture/*from w  ww  .j a  v a 2  s  .com*/
            .allOf(futures.stream().map(f -> f.thenAccept(cf::complete)).toArray(CompletableFuture<?>[]::new))
            .exceptionally(ex -> {
                cf.completeExceptionally(ex);
                return null;
            });
    return cf;
}

---

From source file:Main.java

public static <T> CompletableFuture<List<T>> allOfFutures(
        List<? extends CompletableFuture<? extends T>> futures) {
    List<T> result = new ArrayList<>(futures.size());
    CompletableFuture<List<T>> cf = new CompletableFuture<>();
    CompletableFuture/*from   w ww .j  a v a  2  s .  c o m*/
            .allOf(futures.stream().map(s -> s.thenAccept(result::add)).toArray(CompletableFuture<?>[]::new))
            .exceptionally(ex -> {
                cf.completeExceptionally(ex);
                return null;
            }).thenAccept(v -> cf.complete(result));
    return cf;
}

---

From source file:com.opopov.cloud.image.utils.Utils.java

public static <T> CompletableFuture<T> fromListenableFuture(ListenableFuture<T> listenable) {
    CompletableFuture<T> completable = new CompletableFuture<T>() {

        @Override//from www .  j  a  va2s  .  com
        public boolean isCancelled() {
            return listenable.isCancelled();
        }

        @Override
        public boolean cancel(boolean mayInterruptIfRunning) {
            //delegate cancel to the wrapped listenable
            boolean cancelledStatus = listenable.cancel(mayInterruptIfRunning);
            super.cancel(mayInterruptIfRunning);
            return cancelledStatus;
        }
    };

    //now delegate the callbacks
    ListenableFutureCallback<T> callback = new ListenableFutureCallback<T>() {
        @Override
        public void onFailure(Throwable ex) {
            //delegate exception
            completable.completeExceptionally(ex);
        }

        @Override
        public void onSuccess(T result) {
            //delegate success
            completable.complete(result);
        }
    };

    listenable.addCallback(callback);

    return completable;

}

---

From source file:enmasse.queue.scheduler.Artemis.java

public static Future<Broker> create(Vertx vertx, ProtonConnection connection) {
    CompletableFuture<Broker> promise = new CompletableFuture<>();
    connection.sessionOpenHandler(ProtonSession::open);
    BlockingQueue<Message> replies = new LinkedBlockingDeque<>();
    ProtonSender sender = connection.createSender("activemq.management");
    sender.openHandler(result -> {/*ww w.  ja  v  a 2s. c om*/
        ProtonReceiver receiver = connection.createReceiver("activemq.management");
        Source source = new Source();
        source.setDynamic(true);
        receiver.setSource(source);
        receiver.openHandler(h -> {
            promise.complete(new Artemis(vertx, sender, h.result().getRemoteSource().getAddress(), replies));
        });
        receiver.handler(((protonDelivery, message) -> {
            try {
                replies.put(message);
                ProtonHelper.accepted(protonDelivery, true);
            } catch (Exception e) {
                ProtonHelper.rejected(protonDelivery, true);
            }
        }));
        receiver.open();
    });
    sender.open();
    return promise;
}

---

From source file:org.jnode.net.NServerSocket.java

public CompletableFuture<NServerSocket> listen(int port) {

    if (isBound) {
        CompletableFuture cf = new CompletableFuture<>();
        cf.completeExceptionally(new IllegalStateException("Server already bound"));
        return cf;
    }/*from   www.j  a va 2 s  .c  o  m*/
    return createServerChannel(port).thenCompose((socketChannel) -> {
        this.ssc = socketChannel;
        return looper.register(socketChannel, SelectionKey.OP_ACCEPT, new ServerChannelEvent());
    }).whenComplete((ok, ex) -> {
        if (ex != null && ssc != null && ssc.isOpen())
            IOUtils.closeQuietly(ssc);
    }).thenCompose((SelectionKey selKey) -> {
        sk = selKey;
        isBound = true;
        return CompletableFuture.completedFuture(this);
    });
}

---

From source file:org.apache.hadoop.hbase.AsyncMetaTableAccessor.java

public static CompletableFuture<Optional<TableState>> getTableState(RawAsyncTable metaTable,
        TableName tableName) {// ww w.j  av a  2  s.c om
    CompletableFuture<Optional<TableState>> future = new CompletableFuture<>();
    Get get = new Get(tableName.getName()).addColumn(getTableFamily(), getStateColumn());
    long time = EnvironmentEdgeManager.currentTime();
    try {
        get.setTimeRange(0, time);
        metaTable.get(get).whenComplete((result, error) -> {
            if (error != null) {
                future.completeExceptionally(error);
                return;
            }
            try {
                future.complete(getTableState(result));
            } catch (IOException e) {
                future.completeExceptionally(e);
            }
        });
    } catch (IOException ioe) {
        future.completeExceptionally(ioe);
    }
    return future;
}

---

From source file:pt.isel.mpd.util.HttpGwAsyncNio.java

public CompletableFuture<Response> getDataAsync(String path) {

    CompletableFuture<Response> promise = new CompletableFuture<>();
    client.prepareGet(path).execute(new AsyncCompletionHandler<Object>() {
        @Override/*from   ww  w.  jav  a2 s .  c  om*/
        public Object onCompleted(Response response) throws Exception {
            promise.complete(response);
            return response;
        }
    });
    return promise;
}

---

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