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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.flow;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.Set;
import java.util.HashSet;
public abstract class AbstractFlowCreditManager implements FlowCreditManager
{
protected final AtomicBoolean _suspended = new AtomicBoolean(false);
private final ArrayList<FlowCreditManagerListener> _listeners = new ArrayList<FlowCreditManagerListener>();
public final void addStateListener(FlowCreditManagerListener listener)
{
synchronized(_listeners)
{
if(!_listeners.contains(listener))
{
_listeners.add(listener);
}
}
}
public final boolean removeListener(FlowCreditManagerListener listener)
{
synchronized(_listeners)
{
return _listeners.remove(listener);
}
}
private void notifyListeners(final boolean suspended)
{
synchronized(_listeners)
{
final int size = _listeners.size();
for(int i = 0; i<size; i++)
{
_listeners.get(i).creditStateChanged(!suspended);
}
}
}
protected final void setSuspended(final boolean suspended)
{
if(_suspended.compareAndSet(!suspended, suspended))
{
notifyListeners(suspended);
}
}
protected final void notifyIncreaseBytesCredit()
{
notifyListeners(false);
}
}
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