| // Copyright 2019 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef REMOTING_SIGNALING_MESSAGE_TRACKER_H_ |
| #define REMOTING_SIGNALING_MESSAGE_TRACKER_H_ |
| |
| #include <map> |
| #include <string> |
| |
| #include "base/macros.h" |
| #include "base/time/time.h" |
| #include "base/timer/timer.h" |
| |
| namespace remoting { |
| |
| // FTL messaging doesn't guarantee a message won't be received more than once, |
| // so this class helps deduplicating messages based on their message ID. |
| class MessageTracker final { |
| public: |
| MessageTracker(); |
| ~MessageTracker(); |
| |
| // Tracks |id|. If |id| is already tracked then it will update its tracking |
| // time to now. |
| void TrackId(const std::string& id); |
| |
| // Returns true if |id| has been tracked within the tracking window. |
| // |
| // The tracking window is at least (now - kCleanupInterval, now), and can be |
| // up to (now - 2 * kCleanupInterval, now). |
| bool IsIdTracked(const std::string& id) const; |
| |
| private: |
| friend class MessageTrackerTest; |
| |
| // All IDs older than now - kCleanupInterval will be eventually removed, but |
| // they are not guaranteed to be immediately removed after the interval. |
| static const base::TimeDelta kCleanupInterval; |
| |
| void RemoveExpiredIds(); |
| |
| std::map<std::string, base::Time> tracked_ids_; |
| base::OneShotTimer cleanup_timer_; |
| DISALLOW_COPY_AND_ASSIGN(MessageTracker); |
| }; |
| |
| } // namespace remoting |
| |
| #endif // REMOTING_SIGNALING_MESSAGE_TRACKER_H_ |