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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/metrics/events_metrics_manager.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/raw_ptr.h"
namespace cc {
class EventsMetricsManager::ScopedMonitorImpl
: public EventsMetricsManager::ScopedMonitor {
public:
ScopedMonitorImpl(EventsMetricsManager* manager, DoneCallback done_callback)
: manager_(manager), done_callback_(std::move(done_callback)) {
DCHECK(manager_);
}
~ScopedMonitorImpl() override {
if (manager_)
End();
}
void End() {
DCHECK(manager_);
std::unique_ptr<EventMetrics> metrics;
if (!done_callback_.is_null()) {
const bool handled = save_metrics_;
metrics = std::move(done_callback_).Run(handled);
// If `handled` is false, the callback should return nullptr.
DCHECK(handled || !metrics);
}
manager_->OnScopedMonitorEnded(std::move(metrics));
manager_ = nullptr;
}
// Overridden from EventsMetricsManager::ScopedMonitor.
void SetSaveMetrics() override { save_metrics_ = true; }
private:
raw_ptr<EventsMetricsManager> manager_;
DoneCallback done_callback_;
bool save_metrics_ = false;
};
EventsMetricsManager::ScopedMonitor::ScopedMonitor() = default;
EventsMetricsManager::ScopedMonitor::~ScopedMonitor() = default;
EventsMetricsManager::EventsMetricsManager() = default;
EventsMetricsManager::~EventsMetricsManager() {
// If `EventsMetricsManager` is shut down while events are active, end active
// scoped monitors immediately.
while (!active_scoped_monitors_.empty())
active_scoped_monitors_.back()->End();
}
std::unique_ptr<EventsMetricsManager::ScopedMonitor>
EventsMetricsManager::GetScopedMonitor(
ScopedMonitor::DoneCallback done_callback) {
auto monitor =
std::make_unique<ScopedMonitorImpl>(this, std::move(done_callback));
active_scoped_monitors_.push_back(monitor.get());
return monitor;
}
void EventsMetricsManager::SaveActiveEventMetrics() {
if (active_scoped_monitors_.size() > 0) {
// Here we just set the flag to save the active metrics. The actual saving
// happens when the scoped monitor is destroyed to give clients opportunity
// to use/update the metrics object until the end of their processing.
active_scoped_monitors_.back()->SetSaveMetrics();
}
}
EventMetrics::List EventsMetricsManager::TakeSavedEventsMetrics() {
EventMetrics::List result;
result.swap(saved_events_);
return result;
}
void EventsMetricsManager::OnScopedMonitorEnded(
std::unique_ptr<EventMetrics> metrics) {
DCHECK_GT(active_scoped_monitors_.size(), 0u);
active_scoped_monitors_.pop_back();
if (metrics)
saved_events_.push_back(std::move(metrics));
}
} // namespace cc
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