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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.server.management.amqp;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.qpid.server.consumer.ConsumerImpl;
import org.apache.qpid.server.consumer.ConsumerTarget;
import org.apache.qpid.server.message.MessageSource;
import org.apache.qpid.server.message.internal.InternalMessage;
import org.apache.qpid.server.protocol.AMQSessionModel;
import org.apache.qpid.server.util.StateChangeListener;
class ManagementNodeConsumer implements ConsumerImpl
{
private final long _id = ConsumerImpl.CONSUMER_NUMBER_GENERATOR.getAndIncrement();
private final ManagementNode _managementNode;
private final List<ManagementResponse> _queue = Collections.synchronizedList(new ArrayList<ManagementResponse>());
private final ConsumerTarget _target;
private final String _name;
private final StateChangeListener<ConsumerTarget, ConsumerTarget.State> _targetChangeListener = new TargetChangeListener();
public ManagementNodeConsumer(final String consumerName, final ManagementNode managementNode, ConsumerTarget target)
{
_name = consumerName;
_managementNode = managementNode;
_target = target;
target.addStateListener(_targetChangeListener);
}
@Override
public void externalStateChange()
{
}
@Override
public long getBytesOut()
{
return 0;
}
@Override
public long getMessagesOut()
{
return 0;
}
@Override
public long getUnacknowledgedBytes()
{
return 0;
}
@Override
public long getUnacknowledgedMessages()
{
return 0;
}
@Override
public AMQSessionModel getSessionModel()
{
return _target.getSessionModel();
}
@Override
public MessageSource getMessageSource()
{
return _managementNode;
}
@Override
public long getConsumerNumber()
{
return _id;
}
@Override
public boolean isSuspended()
{
return false;
}
@Override
public boolean isClosed()
{
return false;
}
@Override
public boolean acquires()
{
return true;
}
@Override
public boolean seesRequeues()
{
return false;
}
@Override
public void close()
{
}
@Override
public boolean trySendLock()
{
return _target.trySendLock();
}
@Override
public void getSendLock()
{
_target.getSendLock();
}
@Override
public void releaseSendLock()
{
_target.releaseSendLock();
}
@Override
public boolean isActive()
{
return false;
}
@Override
public String getName()
{
return _name;
}
@Override
public void flush()
{
}
ManagementNode getManagementNode()
{
return _managementNode;
}
void send(final InternalMessage response)
{
_target.getSendLock();
try
{
final ManagementResponse responseEntry = new ManagementResponse(this, response);
if(_queue.isEmpty() && _target.allocateCredit(response))
{
_target.send(this, responseEntry, false);
}
else
{
_queue.add(responseEntry);
}
}
finally
{
_target.releaseSendLock();
}
}
private class TargetChangeListener implements StateChangeListener<ConsumerTarget, ConsumerTarget.State>
{
@Override
public void stateChanged(final ConsumerTarget object,
final ConsumerTarget.State oldState,
final ConsumerTarget.State newState)
{
if(newState == ConsumerTarget.State.ACTIVE)
{
deliverMessages();
}
}
}
private void deliverMessages()
{
_target.getSendLock();
try
{
while(!_queue.isEmpty())
{
final ManagementResponse managementResponse = _queue.get(0);
if(!_target.isSuspended() && _target.allocateCredit(managementResponse.getMessage()))
{
_queue.remove(0);
_target.send(this, managementResponse, false);
}
else
{
break;
}
}
}
finally
{
_target.releaseSendLock();
}
}
}
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