public boolean deliver() throws Exception {
lockDelivery.readLock().lock();
try {
if (largeMessage == null) {
return true;
}
if (availableCredits != null && availableCredits.get() <= 0) {
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
this
+ "::FlowControl::delivery largeMessage interrupting as there are no more credits, available="
+ availableCredits);
}
return false;
}
if (!sentInitialPacket) {
context = largeMessage.getBodyEncoder();
sizePendingLargeMessage = context.getLargeBodySize();
context.open();
sentInitialPacket = true;
int packetSize =
callback.sendLargeMessage(
largeMessage, id, context.getLargeBodySize(), ref.getDeliveryCount());
if (availableCredits != null) {
availableCredits.addAndGet(-packetSize);
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
this
+ "::FlowControl::"
+ " deliver initialpackage with "
+ packetSize
+ " delivered, available now = "
+ availableCredits);
}
}
// Execute the rest of the large message on a different thread so as not to tie up the
// delivery thread
// for too long
resumeLargeMessage();
return false;
} else {
if (availableCredits != null && availableCredits.get() <= 0) {
if (ServerConsumerImpl.isTrace) {
HornetQServerLogger.LOGGER.trace(
this
+ "::FlowControl::deliverLargeMessage Leaving loop of send LargeMessage because of credits, available="
+ availableCredits);
}
return false;
}
int localChunkLen = 0;
localChunkLen =
(int)
Math.min(
sizePendingLargeMessage - positionPendingLargeMessage, minLargeMessageSize);
HornetQBuffer bodyBuffer = HornetQBuffers.fixedBuffer(localChunkLen);
context.encode(bodyBuffer, localChunkLen);
byte[] body = bodyBuffer.toByteBuffer().array();
int packetSize =
callback.sendLargeMessageContinuation(
id,
body,
positionPendingLargeMessage + localChunkLen < sizePendingLargeMessage,
false);
int chunkLen = body.length;
if (availableCredits != null) {
availableCredits.addAndGet(-packetSize);
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
this
+ "::FlowControl::largeMessage deliver continuation, packetSize="
+ packetSize
+ " available now="
+ availableCredits);
}
}
positionPendingLargeMessage += chunkLen;
if (positionPendingLargeMessage < sizePendingLargeMessage) {
resumeLargeMessage();
return false;
}
}
if (ServerConsumerImpl.isTrace) {
HornetQServerLogger.LOGGER.trace("Finished deliverLargeMessage");
}
finish();
return true;
} finally {
lockDelivery.readLock().unlock();
}
}
public int sendMessage(ServerMessage serverMessage, long consumerID, int deliveryCount) {
LargeServerMessageImpl largeMessage = null;
ServerMessage newServerMessage = serverMessage;
try {
StompSubscription subscription = subscriptions.get(consumerID);
StompFrame frame = null;
if (serverMessage.isLargeMessage()) {
newServerMessage = serverMessage.copy();
largeMessage = (LargeServerMessageImpl) serverMessage;
BodyEncoder encoder = largeMessage.getBodyEncoder();
encoder.open();
int bodySize = (int) encoder.getLargeBodySize();
// large message doesn't have a body.
((ServerMessageImpl) newServerMessage).createBody(bodySize);
encoder.encode(newServerMessage.getBodyBuffer(), bodySize);
encoder.close();
}
if (serverMessage.getBooleanProperty(Message.HDR_LARGE_COMPRESSED)) {
// decompress
HornetQBuffer qbuff = newServerMessage.getBodyBuffer();
int bytesToRead = qbuff.writerIndex() - MessageImpl.BODY_OFFSET;
Inflater inflater = new Inflater();
inflater.setInput(qbuff.readBytes(bytesToRead).toByteBuffer().array());
// get the real size of large message
long sizeBody = newServerMessage.getLongProperty(Message.HDR_LARGE_BODY_SIZE);
byte[] data = new byte[(int) sizeBody];
inflater.inflate(data);
inflater.end();
qbuff.resetReaderIndex();
qbuff.resetWriterIndex();
qbuff.writeBytes(data);
}
frame = connection.createStompMessage(newServerMessage, subscription, deliveryCount);
int length = frame.getEncodedSize();
if (subscription.getAck().equals(Stomp.Headers.Subscribe.AckModeValues.AUTO)) {
if (manager.send(connection, frame)) {
// we ack and commit only if the send is successful
session.acknowledge(consumerID, newServerMessage.getMessageID());
session.commit();
}
} else {
messagesToAck.put(
newServerMessage.getMessageID(), new Pair<Long, Integer>(consumerID, length));
// Must send AFTER adding to messagesToAck - or could get acked from client BEFORE it's been
// added!
manager.send(connection, frame);
}
return length;
} catch (Exception e) {
return 0;
} finally {
if (largeMessage != null) {
largeMessage.releaseResources();
largeMessage = null;
}
}
}