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/*
* libjingle
* Copyright 2011 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_APP_WEBRTC_NOTIFIER_H_
#define TALK_APP_WEBRTC_NOTIFIER_H_
#include <list>
#include "talk/app/webrtc/mediastreaminterface.h"
#include "webrtc/base/common.h"
namespace webrtc {
// Implement a template version of a notifier.
template <class T>
class Notifier : public T {
public:
Notifier() {
}
virtual void RegisterObserver(ObserverInterface* observer) {
ASSERT(observer != NULL);
observers_.push_back(observer);
}
virtual void UnregisterObserver(ObserverInterface* observer) {
for (std::list<ObserverInterface*>::iterator it = observers_.begin();
it != observers_.end(); it++) {
if (*it == observer) {
observers_.erase(it);
break;
}
}
}
void FireOnChanged() {
// Copy the list of observers to avoid a crash if the observer object
// unregisters as a result of the OnChanged() call. If the same list is used
// UnregisterObserver will affect the list make the iterator invalid.
std::list<ObserverInterface*> observers = observers_;
for (std::list<ObserverInterface*>::iterator it = observers.begin();
it != observers.end(); ++it) {
(*it)->OnChanged();
}
}
protected:
std::list<ObserverInterface*> observers_;
};
} // namespace webrtc
#endif // TALK_APP_WEBRTC_NOTIFIER_H_
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