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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.
#include "third_party/blink/renderer/platform/long_task_detector.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_thread.h"
namespace blink {
// static
LongTaskDetector& LongTaskDetector::Instance() {
DEFINE_STATIC_LOCAL(Persistent<LongTaskDetector>, long_task_detector,
(new LongTaskDetector));
DCHECK(IsMainThread());
return *long_task_detector;
}
LongTaskDetector::LongTaskDetector() = default;
void LongTaskDetector::RegisterObserver(LongTaskObserver* observer) {
DCHECK(IsMainThread());
DCHECK(observer);
if (observers_.insert(observer).is_new_entry && observers_.size() == 1) {
// Number of observers just became non-zero.
Platform::Current()->CurrentThread()->AddTaskTimeObserver(this);
}
}
void LongTaskDetector::UnregisterObserver(LongTaskObserver* observer) {
DCHECK(IsMainThread());
observers_.erase(observer);
if (observers_.size() == 0) {
Platform::Current()->CurrentThread()->RemoveTaskTimeObserver(this);
}
}
void LongTaskDetector::DidProcessTask(double start_time, double end_time) {
if ((end_time - start_time) < LongTaskDetector::kLongTaskThresholdSeconds)
return;
for (auto& observer : observers_) {
observer->OnLongTaskDetected(TimeTicksFromSeconds(start_time),
TimeTicksFromSeconds(end_time));
}
}
void LongTaskDetector::Trace(blink::Visitor* visitor) {
visitor->Trace(observers_);
}
} // namespace blink
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