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// Copyright 2015 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 COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
#define COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
#include <set>
#include "base/macros.h"
#include "components/scheduler/base/cancelable_closure_holder.h"
#include "components/scheduler/base/time_domain.h"
#include "components/scheduler/scheduler_export.h"
#include "third_party/WebKit/public/platform/WebViewScheduler.h"
namespace scheduler {
class RendererSchedulerImpl;
class ThrottledTimeDomain;
class WebFrameSchedulerImpl;
class SCHEDULER_EXPORT ThrottlingHelper : public TimeDomain::Observer {
public:
ThrottlingHelper(RendererSchedulerImpl* renderer_scheduler,
const char* tracing_category);
~ThrottlingHelper() override;
// TimeDomain::Observer implementation:
void OnTimeDomainHasImmediateWork() override;
void OnTimeDomainHasDelayedWork() override;
// Increments the throttled refcount and causes |task_queue| to be throttled
// if its not already throttled.
void IncreaseThrottleRefCount(TaskQueue* task_queue);
// If the refcouint is non-zero it's decremented. If the throttled refcount
// becomes zero then |task_queue| is unthrottled. If the refcount was already
// zero this function does nothing.
void DecreaseThrottleRefCount(TaskQueue* task_queue);
// Removes |task_queue| from |throttled_queues_|.
void UnregisterTaskQueue(TaskQueue* task_queue);
const ThrottledTimeDomain* time_domain() const { return time_domain_.get(); }
static base::TimeTicks ThrottledRunTime(base::TimeTicks unthrottled_runtime);
const scoped_refptr<TaskQueue>& task_runner() const { return task_runner_; }
private:
using TaskQueueMap = std::map<TaskQueue*, size_t>;
void PumpThrottledTasks();
// Note |unthrottled_runtime| might be in the past. When this happens we
// compute the delay to the next runtime based on now rather than
// unthrottled_runtime.
void MaybeSchedulePumpThrottledTasksLocked(
const tracked_objects::Location& from_here,
base::TimeTicks now,
base::TimeTicks unthrottled_runtime);
TaskQueueMap throttled_queues_;
base::Closure forward_immediate_work_closure_;
scoped_refptr<TaskQueue> task_runner_;
RendererSchedulerImpl* renderer_scheduler_; // NOT OWNED
base::TickClock* tick_clock_; // NOT OWNED
const char* tracing_category_; // NOT OWNED
scoped_ptr<ThrottledTimeDomain> time_domain_;
CancelableClosureHolder suspend_timers_when_backgrounded_closure_;
base::TimeTicks pending_pump_throttled_tasks_runtime_;
base::WeakPtrFactory<ThrottlingHelper> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ThrottlingHelper);
};
} // namespace scheduler
#endif // COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
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