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#ifndef QPID_BROKER_OBSERVERS_H
#define QPID_BROKER_OBSERVERS_H
/*
*
* 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.
*
*/
#include "qpid/sys/Mutex.h"
#include <boost/shared_ptr.hpp>
#include <vector>
#include <algorithm>
namespace qpid {
namespace broker {
/**
* Base class for collections of observers with thread-safe add/remove and traversal.
*/
template <class Observer>
class Observers
{
public:
void add(boost::shared_ptr<Observer> observer) {
sys::Mutex::ScopedLock l(lock);
observers.push_back(observer);
}
void remove(boost::shared_ptr<Observer> observer) {
sys::Mutex::ScopedLock l(lock);
typename List::iterator i = std::find(observers.begin(), observers.end(), observer);
observers.erase(i);
}
protected:
typedef std::vector<boost::shared_ptr<Observer> > List;
sys::Mutex lock;
List observers;
template <class F> void each(F f) {
List copy;
{
sys::Mutex::ScopedLock l(lock);
copy = observers;
}
std::for_each(copy.begin(), copy.end(), f);
}
};
}} // namespace qpid::broker
#endif /*!QPID_BROKER_OBSERVERS_H*/
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