Examples with Publication io.aeron.Publication used on opensource projects

Example 31 with Publication

use of io.aeron.Publication in project aeron by real-logic.

the class Pong method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 */
public static void main(final String[] args) {
    final MediaDriver driver = EMBEDDED_MEDIA_DRIVER ? MediaDriver.launchEmbedded() : null;
    final Aeron.Context ctx = new Aeron.Context();
    if (EMBEDDED_MEDIA_DRIVER) {
        ctx.aeronDirectoryName(driver.aeronDirectoryName());
    }
    if (INFO_FLAG) {
        ctx.availableImageHandler(SamplesUtil::printAvailableImage);
        ctx.unavailableImageHandler(SamplesUtil::printUnavailableImage);
    }
    final IdleStrategy idleStrategy = new BusySpinIdleStrategy();
    System.out.println("Subscribing Ping at " + PING_CHANNEL + " on stream id " + PING_STREAM_ID);
    System.out.println("Publishing Pong at " + PONG_CHANNEL + " on stream id " + PONG_STREAM_ID);
    System.out.println("Using exclusive publications " + EXCLUSIVE_PUBLICATIONS);
    final AtomicBoolean running = new AtomicBoolean(true);
    SigInt.register(() -> running.set(false));
    try (Aeron aeron = Aeron.connect(ctx);
        Subscription subscription = aeron.addSubscription(PING_CHANNEL, PING_STREAM_ID);
        Publication publication = EXCLUSIVE_PUBLICATIONS ? aeron.addExclusivePublication(PONG_CHANNEL, PONG_STREAM_ID) : aeron.addPublication(PONG_CHANNEL, PONG_STREAM_ID)) {
        final BufferClaim bufferClaim = new BufferClaim();
        final FragmentHandler fragmentHandler = (buffer, offset, length, header) -> pingHandler(bufferClaim, publication, buffer, offset, length, header);
        while (running.get()) {
            idleStrategy.idle(subscription.poll(fragmentHandler, FRAME_COUNT_LIMIT));
        }
        System.out.println("Shutting down...");
    }
    CloseHelper.close(driver);
}

Example 32 with Publication

use of io.aeron.Publication in project aeron by real-logic.

the class SimplePublisher method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 * @throws InterruptedException if the thread sleep delay is interrupted.
 */
public static void main(final String[] args) throws InterruptedException {
    // Allocate enough buffer size to hold maximum message length
    // The UnsafeBuffer class is part of the Agrona library and is used for efficient buffer management
    final UnsafeBuffer buffer = new UnsafeBuffer(BufferUtil.allocateDirectAligned(512, BitUtil.CACHE_LINE_LENGTH));
    // The channel (an endpoint identifier) to send the message to
    final String channel = "aeron:udp?endpoint=localhost:40123";
    // A unique identifier for a stream within a channel. Stream ID 0 is reserved
    // for internal use and should not be used by applications.
    final int streamId = 10;
    System.out.println("Publishing to " + channel + " on stream id " + streamId);
    // Create a context, needed for client connection to media driver
    // A separate media driver process needs to be running prior to starting this application
    final Aeron.Context ctx = new Aeron.Context();
    // AutoCloseable, and will automatically clean up resources when this try block is finished.
    try (Aeron aeron = Aeron.connect(ctx);
        Publication publication = aeron.addPublication(channel, streamId)) {
        final String message = "Hello World! ";
        final byte[] messageBytes = message.getBytes();
        buffer.putBytes(0, messageBytes);
        // Wait for 5 seconds to connect to a subscriber
        final long deadlineNs = System.nanoTime() + TimeUnit.SECONDS.toNanos(5);
        while (!publication.isConnected()) {
            if ((deadlineNs - System.nanoTime()) < 0) {
                System.out.println("Failed to connect to subscriber");
                return;
            }
            Thread.sleep(1);
        }
        // Try to publish the buffer. 'offer' is a non-blocking call.
        // If it returns less than 0, the message was not sent, and the offer should be retried.
        final long result = publication.offer(buffer, 0, messageBytes.length);
        if (result < 0L) {
            if (result == Publication.BACK_PRESSURED) {
                System.out.println(" Offer failed due to back pressure");
            } else if (result == Publication.NOT_CONNECTED) {
                System.out.println(" Offer failed because publisher is not connected to subscriber");
            } else if (result == Publication.ADMIN_ACTION) {
                System.out.println("Offer failed because of an administration action in the system");
            } else if (result == Publication.CLOSED) {
                System.out.println("Offer failed publication is closed");
            } else if (result == Publication.MAX_POSITION_EXCEEDED) {
                System.out.println("Offer failed due to publication reaching max position");
            } else {
                System.out.println(" Offer failed due to unknown reason");
            }
        } else {
            System.out.println(" yay !!");
        }
        System.out.println("Done sending.");
    }
}

Example 33 with Publication

use of io.aeron.Publication in project aeron by real-logic.

the class StreamingPublisher method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 * @throws InterruptedException if interrupted during linger.
 */
public static void main(final String[] args) throws InterruptedException {
    if (MESSAGE_LENGTH < SIZE_OF_LONG) {
        throw new IllegalArgumentException("Message length must be at least " + SIZE_OF_LONG + " bytes");
    }
    final MediaDriver driver = EMBEDDED_MEDIA_DRIVER ? MediaDriver.launchEmbedded() : null;
    final Aeron.Context context = new Aeron.Context();
    if (EMBEDDED_MEDIA_DRIVER) {
        context.aeronDirectoryName(driver.aeronDirectoryName());
    }
    final RateReporter reporter = new RateReporter(TimeUnit.SECONDS.toNanos(1), StreamingPublisher::printRate);
    final ExecutorService executor = Executors.newFixedThreadPool(1);
    executor.execute(reporter);
    // clean up resources when this try block is finished.
    try (Aeron aeron = Aeron.connect(context);
        Publication publication = aeron.addPublication(CHANNEL, STREAM_ID)) {
        final ContinueBarrier barrier = new ContinueBarrier("Execute again?");
        final IdleStrategy idleStrategy = SampleConfiguration.newIdleStrategy();
        do {
            printingActive = true;
            System.out.format("%nStreaming %,d messages of%s size %d bytes to %s on stream id %d%n", NUMBER_OF_MESSAGES, RANDOM_MESSAGE_LENGTH ? " random" : "", MESSAGE_LENGTH, CHANNEL, STREAM_ID);
            long backPressureCount = 0;
            for (long i = 0; i < NUMBER_OF_MESSAGES; i++) {
                final int length = LENGTH_GENERATOR.getAsInt();
                OFFER_BUFFER.putLong(0, i);
                idleStrategy.reset();
                while (publication.offer(OFFER_BUFFER, 0, length, null) < 0L) {
                    // The offer failed, which is usually due to the publication
                    // being temporarily blocked. Retry the offer after a short
                    // spin/yield/sleep, depending on the chosen IdleStrategy.
                    backPressureCount++;
                    idleStrategy.idle();
                }
                reporter.onMessage(length);
            }
            System.out.println("Done streaming. Back pressure ratio " + ((double) backPressureCount / NUMBER_OF_MESSAGES));
            if (LINGER_TIMEOUT_MS > 0) {
                System.out.println("Lingering for " + LINGER_TIMEOUT_MS + " milliseconds...");
                Thread.sleep(LINGER_TIMEOUT_MS);
            }
            printingActive = false;
        } while (barrier.await());
    }
    reporter.halt();
    executor.shutdown();
    CloseHelper.close(driver);
}

Example 34 with Publication

use of io.aeron.Publication in project aeron by real-logic.

the class ArchiveCreator method createRecording.

private static void createRecording(final Aeron aeron, final AeronArchive aeronArchive, final long startPosition, final long targetPosition) {
    final int initialTermId = 7;
    recordingNumber++;
    final ChannelUriStringBuilder uriBuilder = new ChannelUriStringBuilder().media("udp").endpoint("localhost:" + recordingNumber).termLength(TERM_LENGTH);
    if (startPosition > 0) {
        uriBuilder.initialPosition(startPosition, initialTermId, TERM_LENGTH);
    }
    try (Publication publication = aeronArchive.addRecordedExclusivePublication(uriBuilder.build(), STREAM_ID)) {
        final CountersReader counters = aeron.countersReader();
        final int counterId = awaitRecordingCounterId(counters, publication.sessionId());
        final long recordingId = RecordingPos.getRecordingId(counters, counterId);
        System.out.println("recordingId=" + recordingId + " position " + publication.position() + " to " + targetPosition);
        offerToPosition(publication, targetPosition);
        awaitPosition(counters, counterId, publication.position());
        aeronArchive.stopRecording(publication);
    }
}

Example 35 with Publication

use of io.aeron.Publication in project aeron by real-logic.

the class EmbeddedThroughput method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 * @throws InterruptedException if the thread is interrupted during linger.
 */
public static void main(final String[] args) throws InterruptedException {
    loadPropertiesFiles(args);
    final RateReporter reporter = new RateReporter(TimeUnit.SECONDS.toNanos(1), EmbeddedThroughput::printRate);
    final ExecutorService executor = Executors.newFixedThreadPool(2);
    final AtomicBoolean running = new AtomicBoolean(true);
    try (MediaDriver mediaDriver = MediaDriver.launch();
        Aeron aeron = Aeron.connect(new Aeron.Context().aeronDirectoryName(mediaDriver.aeronDirectoryName()));
        Subscription subscription = aeron.addSubscription(CHANNEL, STREAM_ID);
        Publication publication = aeron.addPublication(CHANNEL, STREAM_ID)) {
        executor.execute(reporter);
        executor.execute(() -> SamplesUtil.subscriberLoop(rateReporterHandler(reporter), FRAGMENT_COUNT_LIMIT, running).accept(subscription));
        final ContinueBarrier barrier = new ContinueBarrier("Execute again?");
        final IdleStrategy idleStrategy = SampleConfiguration.newIdleStrategy();
        do {
            System.out.format("%nStreaming %,d messages of payload length %d bytes to %s on stream id %d%n", NUMBER_OF_MESSAGES, MESSAGE_LENGTH, CHANNEL, STREAM_ID);
            printingActive = true;
            long backPressureCount = 0;
            for (long i = 0; i < NUMBER_OF_MESSAGES; i++) {
                OFFER_BUFFER.putLong(0, i);
                idleStrategy.reset();
                while (publication.offer(OFFER_BUFFER, 0, MESSAGE_LENGTH, null) < 0) {
                    backPressureCount++;
                    idleStrategy.idle();
                }
            }
            System.out.println("Done streaming. backPressureRatio=" + ((double) backPressureCount / NUMBER_OF_MESSAGES));
            if (LINGER_TIMEOUT_MS > 0) {
                System.out.println("Lingering for " + LINGER_TIMEOUT_MS + " milliseconds...");
                Thread.sleep(LINGER_TIMEOUT_MS);
            }
            printingActive = false;
        } while (barrier.await());
        running.set(false);
        reporter.halt();
        executor.shutdown();
    }
}