Java Code Examples for io.aeron.Publication#BACK_PRESSURED
The following examples show how to use
io.aeron.Publication#BACK_PRESSURED .
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Example 1
| Source File: RecordedBasicPublisher.java From aeron with Apache License 2.0 | 5 votes |
|
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);
}
}
Example 2
| Source File: AeronNDArrayPublisher.java From nd4j with Apache License 2.0 | 5 votes |
|
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");
}
Example 3
| Source File: AeronNDArrayPublisher.java From deeplearning4j with Apache License 2.0 | 5 votes |
|
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");
}
Example 4
| Source File: MultiplePublishersWithFragmentation.java From aeron with Apache License 2.0 | 4 votes |
|
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));
}
}
Example 5
| Source File: SimplePublisher.java From aeron with Apache License 2.0 | 4 votes |
|
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.");
}
}
Example 6
| Source File: BasicPublisher.java From aeron with Apache License 2.0 | 4 votes |
|
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);
}
