| /* |
| * |
| * 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.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 Set<FlowCreditManagerListener> _listeners = new HashSet<FlowCreditManagerListener>(); |
| |
| public final void addStateListener(FlowCreditManagerListener listener) |
| { |
| _listeners.add(listener); |
| } |
| |
| public final boolean removeListener(FlowCreditManagerListener listener) |
| { |
| return _listeners.remove(listener); |
| } |
| |
| private void notifyListeners(final boolean suspended) |
| { |
| for(FlowCreditManagerListener listener : _listeners) |
| { |
| listener.creditStateChanged(!suspended); |
| } |
| } |
| |
| protected final void setSuspended(final boolean suspended) |
| { |
| if(_suspended.compareAndSet(!suspended, suspended)) |
| { |
| notifyListeners(suspended); |
| } |
| } |
| |
| protected final void notifyIncreaseBytesCredit() |
| { |
| notifyListeners(false); |
| } |
| } |