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/*
* Copyright 2015 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 WEBRTC_BASE_NETWORKMONITOR_H_
#define WEBRTC_BASE_NETWORKMONITOR_H_
#include "webrtc/base/logging.h"
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/base/sigslot.h"
#include "webrtc/base/thread.h"
namespace rtc {
/*
* Receives network-change events via |OnNetworksChanged| and signals the
* networks changed event.
*
* Threading consideration:
* It is expected that all upstream operations (from native to Java) are
* performed from the worker thread. This includes creating, starting and
* stopping the monitor. This avoids the potential race condition when creating
* the singleton Java NetworkMonitor class. Downstream operations can be from
* any thread, but this class will forward all the downstream operations onto
* the worker thread.
*
* Memory consideration:
* NetworkMonitor is owned by the caller (NetworkManager). The global network
* monitor factory is owned by the factory itself but needs to be released from
* the factory creator.
*/
// Generic network monitor interface. It starts and stops monitoring network
// changes, and fires the SignalNetworksChanged event when networks change.
class NetworkMonitorInterface {
public:
NetworkMonitorInterface();
virtual ~NetworkMonitorInterface();
sigslot::signal0<> SignalNetworksChanged;
virtual void Start() = 0;
virtual void Stop() = 0;
// Implementations should call this method on the base when networks change,
// and the base will fire SignalNetworksChanged on the right thread.
virtual void OnNetworksChanged() = 0;
};
class NetworkMonitorBase : public NetworkMonitorInterface,
public MessageHandler,
public sigslot::has_slots<> {
public:
NetworkMonitorBase();
~NetworkMonitorBase() override;
void OnNetworksChanged() override;
void OnMessage(Message* msg) override;
private:
Thread* thread_;
};
/*
* NetworkMonitorFactory creates NetworkMonitors.
*/
class NetworkMonitorFactory {
public:
// This is not thread-safe; it should be called once (or once per audio/video
// call) during the call initialization.
static void SetFactory(NetworkMonitorFactory* factory);
static void ReleaseFactory(NetworkMonitorFactory* factory);
static NetworkMonitorFactory* GetFactory();
virtual NetworkMonitorInterface* CreateNetworkMonitor() = 0;
virtual ~NetworkMonitorFactory();
protected:
NetworkMonitorFactory();
};
} // namespace rtc
#endif // WEBRTC_BASE_NETWORKMONITOR_H_
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