org.apache.activemq.transport.amqp.protocol.AmqpAbstractReceiver Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.transport.amqp.protocol;
import org.apache.activemq.command.LocalTransactionId;
import org.apache.activemq.transport.amqp.AmqpProtocolException;
import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Receiver;
import org.fusesource.hawtbuf.Buffer;
import org.fusesource.hawtbuf.ByteArrayOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Abstract base that provides common services for AMQP Receiver types.
*/
public abstract class AmqpAbstractReceiver extends AmqpAbstractLink {
private static final Logger LOG = LoggerFactory.getLogger(AmqpAbstractReceiver.class);
protected ByteArrayOutputStream current = new ByteArrayOutputStream();
protected final byte[] recvBuffer = new byte[1024 * 8];
protected final int configuredCredit;
/**
* Handle create of new AMQP Receiver instance.
*
* @param session
* the AmqpSession that servers as the parent of this Link.
* @param endpoint
* the Receiver endpoint being managed by this class.
*/
public AmqpAbstractReceiver(AmqpSession session, Receiver endpoint) {
super(session, endpoint);
this.configuredCredit = session.getConnection().getConfiguredReceiverCredit();
}
@Override
public void detach() {
}
@Override
public void flow() throws Exception {
}
/**
* Returns the amount of receiver credit that has been configured for this AMQP
* transport. If no value was configured on the TransportConnector URI then a
* sensible default is used.
*
* @return the configured receiver credit to grant.
*/
public int getConfiguredReceiverCredit() {
return configuredCredit;
}
/**
* Provide the receiver endpoint with the given amount of credits.
*
* @param credits
* the credit value to pass on to the wrapped Receiver.
*/
public void flow(int credits) {
getEndpoint().flow(credits);
}
@Override
public void commit(LocalTransactionId txnId) throws Exception {
}
@Override
public void rollback(LocalTransactionId txnId) throws Exception {
}
@Override
public void delivery(Delivery delivery) throws Exception {
if (!delivery.isReadable()) {
LOG.debug("Delivery was not readable!");
return;
}
if (current == null) {
current = new ByteArrayOutputStream();
}
int count;
while ((count = getEndpoint().recv(recvBuffer, 0, recvBuffer.length)) > 0) {
current.write(recvBuffer, 0, count);
if (current.size() > session.getMaxFrameSize()) {
throw new AmqpProtocolException("Frame size of " + current.size() + " larger than max allowed " + session.getMaxFrameSize());
}
}
// Expecting more deliveries..
if (count == 0) {
return;
}
try {
processDelivery(delivery, current.toBuffer());
} finally {
getEndpoint().advance();
current = null;
}
}
protected abstract void processDelivery(Delivery delivery, Buffer deliveryBytes) throws Exception;
}