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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.subscription;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.filter.FilterManager;
import org.apache.qpid.server.logging.actors.CurrentActor;
import org.apache.qpid.server.logging.messages.SubscriptionMessages;
import org.apache.qpid.server.message.ServerMessage;
import org.apache.qpid.server.protocol.AMQSessionModel;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.util.StateChangeListener;
import java.util.EnumMap;
import java.util.concurrent.atomic.AtomicBoolean;
public class DelegatingSubscription<T extends SubscriptionTarget> extends AbstractSubscription
{
private static final Logger _logger = Logger.getLogger(DelegatingSubscription.class);
private final AtomicBoolean _closed = new AtomicBoolean(false);
static final EnumMap<SubscriptionTarget.State, State> STATE_MAP =
new EnumMap<SubscriptionTarget.State, State>(SubscriptionTarget.State.class);
static
{
STATE_MAP.put(SubscriptionTarget.State.ACTIVE, State.ACTIVE);
STATE_MAP.put(SubscriptionTarget.State.SUSPENDED, State.SUSPENDED);
STATE_MAP.put(SubscriptionTarget.State.CLOSED, State.CLOSED);
}
private final T _target;
public DelegatingSubscription(final FilterManager filters,
final Class<? extends ServerMessage> messageClass,
final boolean acquires,
final boolean seesRequeues,
final String consumerName,
final boolean isTransient,
T target)
{
super(filters, messageClass, target.getSessionModel().getConnectionReference(),
acquires, seesRequeues, consumerName, isTransient);
_target = target;
_target.setStateListener(
new StateChangeListener<SubscriptionTarget, SubscriptionTarget.State>()
{
@Override
public void stateChanged(final SubscriptionTarget object,
final SubscriptionTarget.State oldState,
final SubscriptionTarget.State newState)
{
targetStateChanged(oldState, newState);
}
});
}
private void targetStateChanged(final SubscriptionTarget.State oldState, final SubscriptionTarget.State newState)
{
if(oldState != newState)
{
if(newState == SubscriptionTarget.State.CLOSED)
{
if(_closed.compareAndSet(false,true))
{
CurrentActor.get().message(getLogSubject(), SubscriptionMessages.CLOSE());
}
}
else
{
CurrentActor.get().message(getLogSubject(),SubscriptionMessages.STATE(newState.toString()));
}
}
if(newState == SubscriptionTarget.State.CLOSED && oldState != newState)
{
try
{
getQueue().unregisterSubscription(this);
}
catch (AMQException e)
{
_logger.error("Unable to remove to remove subscription", e);
throw new RuntimeException(e);
}
}
final StateChangeListener<Subscription, State> stateListener = getStateListener();
if(stateListener != null)
{
stateListener.stateChanged(this, STATE_MAP.get(oldState), STATE_MAP.get(newState));
}
}
public T getTarget()
{
return _target;
}
@Override
public long getUnacknowledgedBytes()
{
return _target.getUnacknowledgedBytes();
}
@Override
public long getUnacknowledgedMessages()
{
return _target.getUnacknowledgedMessages();
}
@Override
public AMQSessionModel getSessionModel()
{
return _target.getSessionModel();
}
@Override
public boolean isSuspended()
{
return _target.isSuspended();
}
@Override
public void close()
{
_target.close();
}
@Override
protected void doSend(final QueueEntry entry, final boolean batch) throws AMQException
{
_target.send(entry, batch);
}
@Override
public void flushBatched()
{
_target.flushBatched();
}
@Override
public void queueDeleted()
{
_target.queueDeleted();
}
@Override
public boolean wouldSuspend(final QueueEntry msg)
{
return !_target.allocateCredit(msg);
}
@Override
public void restoreCredit(final QueueEntry queueEntry)
{
_target.restoreCredit(queueEntry);
}
@Override
public void queueEmpty() throws AMQException
{
_target.queueEmpty();
}
@Override
public State getState()
{
return STATE_MAP.get(_target.getState());
}
}
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