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// Copyright 2017 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 THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_LONG_TASK_DETECTOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_LONG_TASK_DETECTOR_H_
#include "base/macros.h"
#include "base/task/sequence_manager/task_time_observer.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
class CORE_EXPORT LongTaskObserver : public GarbageCollectedMixin {
public:
virtual ~LongTaskObserver() = default;
virtual void OnLongTaskDetected(TimeTicks start_time, TimeTicks end_time) = 0;
};
// LongTaskDetector detects tasks longer than kLongTaskThreshold and notifies
// observers. When it has non-zero LongTaskObserver, it adds itself as a
// TaskTimeObserver on the main thread and observes every task. When the number
// of LongTaskObservers drop to zero it automatically removes itself as a
// TaskTimeObserver.
class CORE_EXPORT LongTaskDetector final
: public GarbageCollectedFinalized<LongTaskDetector>,
public base::sequence_manager::TaskTimeObserver {
public:
static LongTaskDetector& Instance();
LongTaskDetector();
void RegisterObserver(LongTaskObserver*);
void UnregisterObserver(LongTaskObserver*);
void Trace(blink::Visitor*);
static constexpr base::TimeDelta kLongTaskThreshold =
base::TimeDelta::FromMilliseconds(50);
private:
// scheduler::TaskTimeObserver implementation
void WillProcessTask(base::TimeTicks start_time) override {}
void DidProcessTask(base::TimeTicks start_time,
base::TimeTicks end_time) override;
HeapHashSet<Member<LongTaskObserver>> observers_;
DISALLOW_COPY_AND_ASSIGN(LongTaskDetector);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_LONG_TASK_DETECTOR_H_
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