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

Example 51 with Subscription

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

the class ReplayedBasicSubscriber method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 */
public static void main(final String[] args) {
    System.out.println("Subscribing to " + CHANNEL + " on stream id " + STREAM_ID);
    final FragmentHandler fragmentHandler = SamplesUtil.printAsciiMessage(STREAM_ID);
    final AtomicBoolean running = new AtomicBoolean(true);
    SigInt.register(() -> running.set(false));
    // Create a unique response stream id so not to clash with other archive clients.
    final AeronArchive.Context archiveCtx = new AeronArchive.Context().controlResponseStreamId(AeronArchive.Configuration.controlResponseStreamId() + 2);
    try (AeronArchive archive = AeronArchive.connect(archiveCtx)) {
        final long recordingId = findLatestRecording(archive);
        final long position = 0L;
        final long length = Long.MAX_VALUE;
        final long sessionId = archive.startReplay(recordingId, position, length, CHANNEL, REPLAY_STREAM_ID);
        final String channel = ChannelUri.addSessionId(CHANNEL, (int) sessionId);
        try (Subscription subscription = archive.context().aeron().addSubscription(channel, REPLAY_STREAM_ID)) {
            SamplesUtil.subscriberLoop(fragmentHandler, FRAGMENT_COUNT_LIMIT, running).accept(subscription);
            System.out.println("Shutting down...");
        }
    }
}

Example 52 with Subscription

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

the class SimpleSubscriber method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 */
public static void main(final String[] args) {
    // Maximum number of message fragments to receive during a single 'poll' operation
    final int fragmentLimitCount = 10;
    // The channel (an endpoint identifier) to receive messages from
    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("Subscribing to " + channel + " on stream id " + streamId);
    final AtomicBoolean running = new AtomicBoolean(true);
    // Register a SIGINT handler for graceful shutdown.
    SigInt.register(() -> running.set(false));
    // dataHandler method is called for every new datagram received
    final FragmentHandler fragmentHandler = (buffer, offset, length, header) -> {
        final byte[] data = new byte[length];
        buffer.getBytes(offset, data);
        System.out.printf("Received message (%s) to stream %d from session %x term id %x term offset %d (%d@%d)%n", new String(data), streamId, header.sessionId(), header.termId(), header.termOffset(), length, offset);
        // Received the intended message, time to exit the program
        running.set(false);
    };
    // Create a context, needed for client connection to media driver
    // A separate media driver process need to run prior to running this application
    final Aeron.Context ctx = new Aeron.Context();
    // clean up resources when this try block is finished.
    try (Aeron aeron = Aeron.connect(ctx);
        Subscription subscription = aeron.addSubscription(channel, streamId)) {
        final IdleStrategy idleStrategy = new BackoffIdleStrategy(100, 10, TimeUnit.MICROSECONDS.toNanos(1), TimeUnit.MICROSECONDS.toNanos(100));
        // Try to read the data from subscriber
        while (running.get()) {
            // poll delivers messages to the dataHandler as they arrive
            // and returns number of fragments read, or 0
            // if no data is available.
            final int fragmentsRead = subscription.poll(fragmentHandler, fragmentLimitCount);
            // Give the IdleStrategy a chance to spin/yield/sleep to reduce CPU
            // use if no messages were received.
            idleStrategy.idle(fragmentsRead);
        }
        System.out.println("Shutting down...");
    }
}

Example 53 with Subscription

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

the class FileReceiver method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 */
public static void main(final String[] args) {
    final File storageDir;
    if (args.length > 1) {
        storageDir = new File(args[0]);
        if (!storageDir.isDirectory()) {
            System.out.println(args[0] + " is not a directory");
            System.exit(1);
        }
    } else {
        storageDir = new File(SystemUtil.tmpDirName());
    }
    System.out.println("Files stored to " + storageDir.getAbsolutePath());
    final IdleStrategy idleStrategy = new SleepingMillisIdleStrategy(1);
    final AtomicBoolean running = new AtomicBoolean(true);
    SigInt.register(() -> running.set(false));
    try (MediaDriver mediaDriver = MediaDriver.launch();
        Aeron aeron = Aeron.connect(new Aeron.Context().aeronDirectoryName(mediaDriver.aeronDirectoryName()));
        Subscription subscription = aeron.addSubscription(CHANNEL, STREAM_ID)) {
        System.out.println("Receiving from " + CHANNEL + " on stream id " + STREAM_ID);
        final FileReceiver fileReceiver = new FileReceiver(storageDir, subscription);
        while (running.get()) {
            idleStrategy.idle(fileReceiver.doWork());
        }
    }
}

Example 54 with Subscription

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

the class BasicSubscriber method main.

/**
 * Main method for launching the process.
 *
 * @param args passed to the process.
 */
public static void main(final String[] args) {
    System.out.println("Subscribing to " + CHANNEL + " on stream id " + STREAM_ID);
    final MediaDriver driver = EMBEDDED_MEDIA_DRIVER ? MediaDriver.launchEmbedded() : null;
    final Aeron.Context ctx = new Aeron.Context().availableImageHandler(SamplesUtil::printAvailableImage).unavailableImageHandler(SamplesUtil::printUnavailableImage);
    if (EMBEDDED_MEDIA_DRIVER) {
        ctx.aeronDirectoryName(driver.aeronDirectoryName());
    }
    final FragmentHandler fragmentHandler = SamplesUtil.printAsciiMessage(STREAM_ID);
    final AtomicBoolean running = new AtomicBoolean(true);
    // Register a SIGINT handler for graceful shutdown.
    SigInt.register(() -> running.set(false));
    // clean up resources when this try block is finished
    try (Aeron aeron = Aeron.connect(ctx);
        Subscription subscription = aeron.addSubscription(CHANNEL, STREAM_ID)) {
        SamplesUtil.subscriberLoop(fragmentHandler, FRAGMENT_COUNT_LIMIT, running).accept(subscription);
        System.out.println("Shutting down...");
    }
    CloseHelper.close(driver);
}

Example 55 with Subscription

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

the class MultipleSubscribersWithFragmentAssembly method eventUnavailableImage.

/**
 * This handler is called when image is unavailable.
 *
 * @param image that has gone inactive.
 */
public static void eventUnavailableImage(final Image image) {
    final Subscription subscription = image.subscription();
    System.out.format("inactive image on %s streamId %d sessionId %x%n", subscription.channel(), subscription.streamId(), image.sessionId());
}