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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_ARC_TRACING_ARC_VALUE_EVENT_TRIMMER_H_
#define CHROME_BROWSER_ASH_ARC_TRACING_ARC_VALUE_EVENT_TRIMMER_H_
#include "base/memory/raw_ptr.h"
#include "chrome/browser/ash/arc/tracing/arc_value_event.h"
namespace arc {
// Helper that prevents adding events with the same value.
// For example event values (value:timestamp)
// 1:100 2:101 2:102 2:103 2:104 1:105 2:106
// would be trimmed to
// 1:100 2:101 2:104 1:105 2:106.
class ArcValueEventTrimmer {
public:
ArcValueEventTrimmer(ValueEvents* events, ArcValueEvent::Type type);
ArcValueEventTrimmer(const ArcValueEventTrimmer&) = delete;
ArcValueEventTrimmer& operator=(const ArcValueEventTrimmer&) = delete;
~ArcValueEventTrimmer();
// May be add the next event, in case it is not trimmed out.
void MaybeAdd(int64_t timestamp, int value);
// Resets values it they represent the constant |value|.
void ResetIfConstant(int value);
private:
// In case value has changed, insert last trimmed value.
void Flush();
const raw_ptr<ValueEvents> events_;
const ArcValueEvent::Type type_;
// Indicate if this is first event that would never be trimmed.
bool first_event_ = true;
// Set to true in case last event was trimmed.
bool was_trimmed_ = false;
// Timestamp of the last trimmed event.
int64_t last_trimmed_timestamp_;
// Value of the last event.
int last_value_ = 0;
};
} // namespace arc
#endif // CHROME_BROWSER_ASH_ARC_TRACING_ARC_VALUE_EVENT_TRIMMER_H_
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