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/*
* 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.qpid.amqp_1_0.client;
import org.apache.qpid.amqp_1_0.messaging.SectionEncoder;
import org.apache.qpid.amqp_1_0.transport.DeliveryStateHandler;
import org.apache.qpid.amqp_1_0.transport.SendingLinkEndpoint;
import org.apache.qpid.amqp_1_0.type.Binary;
import org.apache.qpid.amqp_1_0.type.DeliveryState;
import org.apache.qpid.amqp_1_0.type.messaging.AmqpValue;
import org.apache.qpid.amqp_1_0.type.transaction.Declare;
import org.apache.qpid.amqp_1_0.type.transaction.Declared;
import org.apache.qpid.amqp_1_0.type.transaction.Discharge;
import org.apache.qpid.amqp_1_0.type.transport.Transfer;
public class TransactionController implements DeliveryStateHandler
{
private static final Binary DELIVERY_TAG = new Binary(new byte[]{(byte) 0});
private SendingLinkEndpoint _endpoint;
private Session _session;
private volatile DeliveryState _state;
private boolean _received;
public TransactionController(Session session, SendingLinkEndpoint tcLinkEndpoint)
{
_session = session;
_endpoint = tcLinkEndpoint;
_endpoint.setDeliveryStateHandler(this);
}
public Transaction beginTransaction()
{
Binary txnId = declare();
return new Transaction(this, txnId);
}
private Binary declare()
{
SectionEncoder encoder = _session.getSectionEncoder();
AmqpValue section = new AmqpValue(new Declare());
Transfer transfer = new Transfer();
transfer.setPayload(section.encode(encoder).asByteBuffer());
transfer.setDeliveryTag(DELIVERY_TAG);
transfer.setSettled(Boolean.FALSE);
final Object lock = _endpoint.getLock();
synchronized(lock)
{
while(!_endpoint.hasCreditToSend())
{
try
{
lock.wait();
}
catch (InterruptedException e)
{
}
}
_state = null;
_received = false;
_endpoint.transfer(transfer);
//TODO - rationalise sending of flows
// _endpoint.sendFlow();
}
synchronized (this)
{
while(!_received)
{
try
{
wait();
}
catch (InterruptedException e)
{
}
}
}
return ((Declared) _state).getTxnId();
}
public void commit(final Transaction transaction)
{
discharge(transaction.getTxnId(), false);
}
public void rollback(final Transaction transaction)
{
discharge(transaction.getTxnId(), true);
}
private void discharge(final Binary txnId, final boolean fail)
{
Discharge discharge = new Discharge();
discharge.setTxnId(txnId);
discharge.setFail(fail);
SectionEncoder encoder = _session.getSectionEncoder();
AmqpValue section = new AmqpValue(discharge);
Transfer transfer = new Transfer();
transfer.setPayload(section.encode(encoder).asByteBuffer());
transfer.setDeliveryTag(DELIVERY_TAG);
transfer.setSettled(Boolean.FALSE);
final Object lock = _endpoint.getLock();
synchronized(lock)
{
while(!_endpoint.hasCreditToSend())
{
try
{
lock.wait();
}
catch (InterruptedException e)
{
}
}
_state = null;
_received = false;
_endpoint.transfer(transfer);
//TODO - rationalise sending of flows
// _endpoint.sendFlow();
}
synchronized (this)
{
while(!_received)
{
try
{
wait();
}
catch (InterruptedException e)
{
}
}
}
}
public void handle(final Binary deliveryTag, final DeliveryState state, final Boolean settled)
{
synchronized(this)
{
_state = state;
_received = true;
if(!Boolean.TRUE.equals(settled))
{
_endpoint.updateDisposition(deliveryTag, state, true);
}
notifyAll();
}
}
public void close()
{
_endpoint.close();
}
}
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