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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_SOCKET_SOCKET_PERFORMANCE_WATCHER_H_
#define NET_SOCKET_SOCKET_PERFORMANCE_WATCHER_H_
#include "net/base/net_export.h"
namespace base {
class TimeDelta;
} // namespace base
namespace net {
// SocketPerformanceWatcher is the base class for recording and aggregating
// per-socket statistics. SocketPerformanceWatcher must be used on a single
// thread.
class NET_EXPORT_PRIVATE SocketPerformanceWatcher {
public:
virtual ~SocketPerformanceWatcher() = default;
// Returns true if |this| SocketPerformanceWatcher is interested in receiving
// an updated RTT estimate (via OnUpdatedRTTAvailable).
virtual bool ShouldNotifyUpdatedRTT() const = 0;
// Notifies |this| SocketPerformanceWatcher of updated transport layer RTT
// from this device to the remote transport layer endpoint. This method is
// called immediately after the observation is made, hence no timestamp.
// There is no guarantee that OnUpdatedRTTAvailable will be called every time
// an updated RTT is available as the socket may throttle the
// OnUpdatedRTTAvailable call for various reasons, including performance.
virtual void OnUpdatedRTTAvailable(const base::TimeDelta& rtt) = 0;
// Notifies that |this| watcher will be reused to watch a socket that belongs
// to a different transport layer connection. Note: The new connection shares
// the same protocol as the previously watched socket.
virtual void OnConnectionChanged() = 0;
};
} // namespace net
#endif // NET_SOCKET_SOCKET_PERFORMANCE_WATCHER_H_
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