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// Copyright 2014 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 CC_BASE_ROLLING_TIME_DELTA_HISTORY_H_
#define CC_BASE_ROLLING_TIME_DELTA_HISTORY_H_
#include <deque>
#include <set>
#include "base/time/time.h"
#include "cc/base/cc_export.h"
namespace cc {
// Stores a limited number of samples. When the maximum size is reached, each
// insertion results in the deletion of the oldest remaining sample.
class CC_EXPORT RollingTimeDeltaHistory {
public:
explicit RollingTimeDeltaHistory(size_t max_size);
~RollingTimeDeltaHistory();
void InsertSample(base::TimeDelta time);
void Clear();
// Returns the smallest sample that is greater than or equal to the specified
// percent of samples. If there aren't any samples, returns base::TimeDelta().
base::TimeDelta Percentile(double percent) const;
private:
typedef std::multiset<base::TimeDelta> TimeDeltaMultiset;
TimeDeltaMultiset sample_set_;
std::deque<TimeDeltaMultiset::iterator> chronological_sample_deque_;
size_t max_size_;
DISALLOW_COPY_AND_ASSIGN(RollingTimeDeltaHistory);
};
} // namespace cc
#endif // CC_BASE_ROLLING_TIME_DELTA_HISTORY_H_
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