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// Copyright 2020 the V8 project 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 V8_LOGGING_METRICS_H_
#define V8_LOGGING_METRICS_H_
#include <memory>
#include <queue>
#include "include/v8-metrics.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/time.h"
#include "src/init/v8.h"
namespace v8 {
class TaskRunner;
namespace internal {
namespace metrics {
class Recorder : public std::enable_shared_from_this<Recorder> {
public:
V8_EXPORT_PRIVATE void SetRecorder(
Isolate* isolate,
const std::shared_ptr<v8::metrics::Recorder>& embedder_recorder);
V8_EXPORT_PRIVATE void NotifyIsolateDisposal();
template <class T>
void AddMainThreadEvent(const T& event,
v8::metrics::Recorder::ContextId id) {
if (embedder_recorder_)
embedder_recorder_->AddMainThreadEvent(event, id);
}
template <class T>
void DelayMainThreadEvent(const T& event,
v8::metrics::Recorder::ContextId id) {
if (!embedder_recorder_) return;
Delay(std::make_unique<DelayedEvent<T>>(event, id));
}
template <class T>
void AddThreadSafeEvent(const T& event) {
if (embedder_recorder_) embedder_recorder_->AddThreadSafeEvent(event);
}
private:
class DelayedEventBase {
public:
virtual ~DelayedEventBase() = default;
virtual void Run(const std::shared_ptr<Recorder>& recorder) = 0;
};
template <class T>
class DelayedEvent : public DelayedEventBase {
public:
DelayedEvent(const T& event, v8::metrics::Recorder::ContextId id)
: event_(event), id_(id) {}
void Run(const std::shared_ptr<Recorder>& recorder) override {
recorder->AddMainThreadEvent(event_, id_);
}
protected:
T event_;
v8::metrics::Recorder::ContextId id_;
};
class Task;
V8_EXPORT_PRIVATE void Delay(
std::unique_ptr<Recorder::DelayedEventBase>&& event);
base::Mutex lock_;
std::shared_ptr<v8::TaskRunner> foreground_task_runner_;
std::shared_ptr<v8::metrics::Recorder> embedder_recorder_;
std::queue<std::unique_ptr<DelayedEventBase>> delayed_events_;
};
template <class T, int64_t (base::TimeDelta::*precision)() const =
&base::TimeDelta::InMicroseconds>
class V8_NODISCARD TimedScope {
public:
explicit TimedScope(T* event) : event_(event) { Start(); }
~TimedScope() { Stop(); }
void Start() { start_time_ = base::TimeTicks::Now(); }
void Stop() {
if (start_time_.IsMin()) return;
base::TimeDelta duration = base::TimeTicks::Now() - start_time_;
event_->wall_clock_duration_in_us = (duration.*precision)();
start_time_ = base::TimeTicks::Min();
}
private:
T* event_;
base::TimeTicks start_time_;
};
} // namespace metrics
} // namespace internal
} // namespace v8
#endif // V8_LOGGING_METRICS_H_
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