61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
|
/*
|
||
|
|
* Copyright 2011 The WebRTC project authors. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Use of this source code is governed by a BSD-style license
|
||
|
|
* that can be found in the LICENSE file in the root of the source
|
||
|
|
* tree. An additional intellectual property rights grant can be found
|
||
|
|
* in the file PATENTS. All contributing project authors may
|
||
|
|
* be found in the AUTHORS file in the root of the source tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef API_NOTIFIER_H_
|
||
|
|
#define API_NOTIFIER_H_
|
||
|
|
|
||
|
|
#include <list>
|
||
|
|
|
||
|
|
#include "api/media_stream_interface.h"
|
||
|
|
#include "rtc_base/checks.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Implements a template version of a notifier.
|
||
|
|
// TODO(deadbeef): This is an implementation detail; move out of api/.
|
||
|
|
template <class T>
|
||
|
|
class Notifier : public T {
|
||
|
|
public:
|
||
|
|
Notifier() {}
|
||
|
|
|
||
|
|
virtual void RegisterObserver(ObserverInterface* observer) {
|
||
|
|
RTC_DCHECK(observer != nullptr);
|
||
|
|
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 // API_NOTIFIER_H_
|