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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_IDLENESS_DETECTOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_IDLENESS_DETECTOR_H_
#include "base/macros.h"
#include "base/task/sequence_manager/task_time_observer.h"
#include "base/time/default_tick_clock.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/timer.h"
namespace blink {
class LocalFrame;
class ResourceFetcher;
// IdlenessDetector observes the resource request count every time a load is
// finshed after DOMContentLoadedEventEnd is fired. It emits a network almost
// idle signal when there are no more than 2 network connections active in 0.5
// seconds, and a network idle signal when there are 0 network connections
// active in 0.5 seconds.
class CORE_EXPORT IdlenessDetector
: public GarbageCollected<IdlenessDetector>,
public base::sequence_manager::TaskTimeObserver {
public:
IdlenessDetector(
LocalFrame*,
const base::TickClock* = base::DefaultTickClock::GetInstance());
void Shutdown();
void WillCommitLoad();
void DomContentLoadedEventFired();
// TODO(lpy) Don't need to pass in fetcher once the command line of disabling
// PlzNavigate is removed.
void OnWillSendRequest(ResourceFetcher*);
void OnDidLoadResource();
base::TimeTicks GetNetworkAlmostIdleTime();
base::TimeTicks GetNetworkIdleTime();
bool NetworkIsAlmostIdle();
void Trace(Visitor*) const;
private:
friend class IdlenessDetectorTest;
// The page is quiet if there are no more than 2 active network requests for
// this duration of time.
static constexpr base::TimeDelta kNetworkQuietWindow =
base::TimeDelta::FromMilliseconds(500);
static constexpr base::TimeDelta kNetworkQuietWatchdog =
base::TimeDelta::FromSeconds(2);
static constexpr int kNetworkQuietMaximumConnections = 2;
// TaskTimeObserver implementation.
void WillProcessTask(base::TimeTicks start_time) override;
void DidProcessTask(base::TimeTicks start_time,
base::TimeTicks end_time) override;
void Stop();
// This method and the associated timer appear to have no effect, but they
// have the side effect of triggering a task, which will send WillProcessTask
// and DidProcessTask observer notifications.
void NetworkQuietTimerFired(TimerBase*);
Member<LocalFrame> local_frame_;
bool task_observer_added_;
bool in_network_0_quiet_period_ = true;
bool in_network_2_quiet_period_ = true;
const base::TickClock* clock_;
base::TimeDelta network_quiet_window_ = kNetworkQuietWindow;
// Store the accumulated time of network quiet.
base::TimeTicks network_0_quiet_;
base::TimeTicks network_2_quiet_;
// Record the actual start time of network quiet.
base::TimeTicks network_0_quiet_start_time_;
base::TimeTicks network_2_quiet_start_time_;
TaskRunnerTimer<IdlenessDetector> network_quiet_timer_;
DISALLOW_COPY_AND_ASSIGN(IdlenessDetector);
};
} // namespace blink
#endif
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