Java Code Examples for io.aeron.Publication#BACK_PRESSURED

private static void checkResult(final long result)
{
    if (result > 0)
    {
        System.out.println("yay!");
    }
    else if (result == Publication.BACK_PRESSURED)
    {
        System.out.println("Offer failed due to back pressure");
    }
    else if (result == Publication.ADMIN_ACTION)
    {
        System.out.println("Offer failed because of an administration action in the system");
    }
    else if (result == Publication.NOT_CONNECTED)
    {
        System.out.println("Offer failed because publisher is not connected to subscriber");
    }
    else if (result == Publication.CLOSED)
    {
        System.out.println("Offer failed publication is closed");
    }
    else if (result == Publication.MAX_POSITION_EXCEEDED)
    {
        throw new IllegalStateException("Offer failed due to publication reaching max position");
    }
    else
    {
        System.out.println("Offer failed due to unknown result code: " + result);
    }
}
 

private void sendBuffer(DirectBuffer buffer) throws Exception {
    // 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.
    long result;
    int tries = 0;
    while ((result = publication.offer(buffer, 0, buffer.capacity())) < 0L && tries < 5) {
        if (result == Publication.BACK_PRESSURED) {
            log.info("Offer failed due to back pressure");
        } else if (result == Publication.NOT_CONNECTED) {
            log.info("Offer failed because publisher is not connected to subscriber " + channel + " and stream "
                            + streamId);
        } else if (result == Publication.ADMIN_ACTION) {
            log.info("Offer failed because of an administration action in the system and channel" + channel
                            + " and stream " + streamId);
        } else if (result == Publication.CLOSED) {
            log.info("Offer failed publication is closed and channel" + channel + " and stream " + streamId);
        } else {
            log.info(" Offer failed due to unknown reason and channel" + channel + " and stream " + streamId);
        }



        Thread.sleep(publishRetryTimeOut);
        tries++;

    }

    if (tries >= 5 && result == 0)
        throw new IllegalStateException("Failed to send message");

}
 

private void sendBuffer(DirectBuffer buffer) throws Exception {
    // 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.
    long result;
    int tries = 0;
    while ((result = publication.offer(buffer, 0, buffer.capacity())) < 0L && tries < 5) {
        if (result == Publication.BACK_PRESSURED) {
            log.info("Offer failed due to back pressure");
        } else if (result == Publication.NOT_CONNECTED) {
            log.info("Offer failed because publisher is not connected to subscriber " + channel + " and stream "
                            + streamId);
        } else if (result == Publication.ADMIN_ACTION) {
            log.info("Offer failed because of an administration action in the system and channel" + channel
                            + " and stream " + streamId);
        } else if (result == Publication.CLOSED) {
            log.info("Offer failed publication is closed and channel" + channel + " and stream " + streamId);
        } else {
            log.info(" Offer failed due to unknown reason and channel" + channel + " and stream " + streamId);
        }



        Thread.sleep(publishRetryTimeOut);
        tries++;

    }

    if (tries >= 5 && result == 0)
        throw new IllegalStateException("Failed to send message");

}
 

public static void main(final String[] args)
{
    System.out.println(
        "Publishing to " + CHANNEL + " on stream id " + STREAM_ID_1 + " and stream id " + STREAM_ID_2);

    try (Aeron aeron = Aeron.connect();
        Publication publication1 = aeron.addPublication(CHANNEL, STREAM_ID_1);
        Publication publication2 = aeron.addPublication(CHANNEL, STREAM_ID_2))
    {
        int j = 1;
        int k = 1;
        final String message1 = "Hello World! " + j;
        BUFFER_1.putBytes(0, message1.getBytes());
        final String message2 = "Hello World! " + k;
        BUFFER_2.putBytes(0, message2.getBytes());

        while (j <= 5000 || k <= 5000)
        {
            boolean offerStatus1 = false;
            boolean offerStatus2 = false;
            long result1;
            long result2;

            while (!(offerStatus1 || offerStatus2))
            {
                if (j <= 5000)
                {
                    result1 = publication1.offer(BUFFER_1, 0, BUFFER_1.capacity());
                    if (result1 < 0L)
                    {
                        if (result1 == Publication.BACK_PRESSURED)
                        {
                            System.out.println(" Offer failed due to back pressure for stream id " + STREAM_ID_1);
                        }
                        else if (result1 == Publication.NOT_CONNECTED)
                        {
                            System.out.println(" Offer failed because publisher is not yet " +
                                "connected to subscriber for stream id " + STREAM_ID_1);
                        }
                        else
                        {
                            System.out.println(" Offer failed due to unknown reason");
                        }

                        offerStatus1 = false;
                    }
                    else
                    {
                        j++;
                        offerStatus1 = true;
                        System.out.println("Successfully sent data on stream id " +
                            STREAM_ID_1 + " and data length " + BUFFER_1.capacity() + " at offset " + result1);
                    }
                }

                if (k <= 5000)
                {
                    result2 = publication2.offer(BUFFER_2, 0, BUFFER_2.capacity());
                    if (result2 < 0L)
                    {
                        if (result2 == Publication.BACK_PRESSURED)
                        {
                            System.out.println(" Offer failed because publisher is not yet " +
                                "connected to subscriber for stream id " + STREAM_ID_2);
                        }
                        else if (result2 == Publication.NOT_CONNECTED)
                        {
                            System.out.println(
                                "Offer failed - publisher is not yet connected to subscriber" + STREAM_ID_2);
                        }
                        else
                        {
                            System.out.println("Offer failed due to unknown reason");
                        }
                        offerStatus2 = false;
                    }
                    else
                    {
                        k++;
                        offerStatus2 = true;
                        System.out.println("Successfully sent data on stream id " + STREAM_ID_2 +
                            " and data length " + BUFFER_2.capacity() + " at offset " + result2);
                    }
                }
            }
        }

        System.out.println("Done sending total messages for stream id " +
            STREAM_ID_1 + " = " + (j - 1) + " and stream id " + STREAM_ID_2 + " = " + (k - 1));
    }
}
 

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

    // Create an Aeron instance with client-provided context configuration and connect to the
    // media driver, and create a Publication.  The Aeron and Publication classes implement
    // 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.");
    }
}
 

public static void main(final String[] args) throws Exception
{
    System.out.println("Publishing to " + CHANNEL + " on stream id " + STREAM_ID);

    // If configured to do so, create an embedded media driver within this application rather
    // than relying on an external one.
    final MediaDriver driver = EMBEDDED_MEDIA_DRIVER ? MediaDriver.launchEmbedded() : null;

    final Aeron.Context ctx = new Aeron.Context();
    if (EMBEDDED_MEDIA_DRIVER)
    {
        ctx.aeronDirectoryName(driver.aeronDirectoryName());
    }

    // Connect a new Aeron instance to the media driver and create a publication on
    // the given channel and stream ID.
    // The Aeron and Publication classes implement "AutoCloseable" and will automatically
    // clean up resources when this try block is finished
    try (Aeron aeron = Aeron.connect(ctx);
        Publication publication = aeron.addPublication(CHANNEL, STREAM_ID))
    {
        for (long i = 0; i < NUMBER_OF_MESSAGES; i++)
        {
            final String message = "Hello World! " + i;
            final byte[] messageBytes = message.getBytes();
            BUFFER.putBytes(0, messageBytes);

            System.out.print("Offering " + i + "/" + NUMBER_OF_MESSAGES + " - ");

            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");
                    break;
                }
                else if (result == Publication.MAX_POSITION_EXCEEDED)
                {
                    System.out.println("Offer failed due to publication reaching max position");
                    break;
                }
                else
                {
                    System.out.println("Offer failed due to unknown reason: " + result);
                }
            }
            else
            {
                System.out.println("yay!");
            }

            if (!publication.isConnected())
            {
                System.out.println("No active subscribers detected");
            }

            Thread.sleep(TimeUnit.SECONDS.toMillis(1));
        }

        System.out.println("Done sending.");

        if (LINGER_TIMEOUT_MS > 0)
        {
            System.out.println("Lingering for " + LINGER_TIMEOUT_MS + " milliseconds...");
            Thread.sleep(LINGER_TIMEOUT_MS);
        }
    }

    CloseHelper.quietClose(driver);
}