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