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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_BASE_LEAKY_BUCKET_H_
#define REMOTING_BASE_LEAKY_BUCKET_H_
#include "base/time/time.h"
namespace remoting {
class LeakyBucket {
public:
static const int kUnlimitedDepth = -1;
// |depth| specifies depth of the bucket in drops. kUnlimitedDepth indicate
// that bucket size is unlimited. |rate| is specified in drops per second.
LeakyBucket(int depth, int rate);
LeakyBucket(const LeakyBucket&) = delete;
LeakyBucket& operator=(const LeakyBucket&) = delete;
~LeakyBucket();
// If the bucket can fit |drops| then adds them and returns true. Otherwise
// returns false.
bool RefillOrSpill(int drops, base::TimeTicks now);
// Updates rate.
void UpdateRate(int new_rate, base::TimeTicks now);
// Returns time when the bucket will be empty. The returned value may be in
// the past.
base::TimeTicks GetEmptyTime();
int rate() { return rate_; }
private:
void UpdateLevel(base::TimeTicks now);
int depth_;
int rate_;
// |current_level_| stores water level at |level_updated_time_|. Updated in
// UpdateLevel(), which is called from RefillOrSpill() and UpdateRate().
int current_level_;
base::TimeTicks level_updated_time_;
};
} // namespace remoting
#endif // REMOTING_BASE_LEAKY_BUCKET_H_
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