61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/*
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* Copyright 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_API_NOTIFIER_H_
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#define WEBRTC_API_NOTIFIER_H_
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#include <list>
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#include "webrtc/api/mediastreaminterface.h"
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#include "webrtc/base/common.h"
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namespace webrtc {
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// Implement a template version of a notifier.
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template <class T>
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class Notifier : public T {
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public:
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Notifier() {
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}
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virtual void RegisterObserver(ObserverInterface* observer) {
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ASSERT(observer != NULL);
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observers_.push_back(observer);
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}
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virtual void UnregisterObserver(ObserverInterface* observer) {
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for (std::list<ObserverInterface*>::iterator it = observers_.begin();
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it != observers_.end(); it++) {
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if (*it == observer) {
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observers_.erase(it);
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break;
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}
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}
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}
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void FireOnChanged() {
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// Copy the list of observers to avoid a crash if the observer object
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// unregisters as a result of the OnChanged() call. If the same list is used
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// UnregisterObserver will affect the list make the iterator invalid.
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std::list<ObserverInterface*> observers = observers_;
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for (std::list<ObserverInterface*>::iterator it = observers.begin();
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it != observers.end(); ++it) {
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(*it)->OnChanged();
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}
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}
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protected:
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std::list<ObserverInterface*> observers_;
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};
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} // namespace webrtc
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#endif // WEBRTC_API_NOTIFIER_H_
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