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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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_DEADLINE_TASK_RUNNER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_DEADLINE_TASK_RUNNER_H_
#include "base/callback.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/scheduler/common/cancelable_closure_holder.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
namespace scheduler {
// Runs a posted task at latest by a given deadline, but possibly sooner.
class PLATFORM_EXPORT DeadlineTaskRunner {
USING_FAST_MALLOC(DeadlineTaskRunner);
public:
DeadlineTaskRunner(const base::RepeatingClosure& callback,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
DeadlineTaskRunner(const DeadlineTaskRunner&) = delete;
DeadlineTaskRunner& operator=(const DeadlineTaskRunner&) = delete;
~DeadlineTaskRunner();
// If there is no outstanding task then a task is posted to run after |delay|.
// If there is an outstanding task which is scheduled to run:
// a) sooner - then this is a NOP.
// b) later - then the outstanding task is cancelled and a new task is
// posted to run after |delay|.
//
// Once the deadline task has run, we reset.
void SetDeadline(const base::Location& from_here,
base::TimeDelta delay,
base::TimeTicks now);
private:
void RunInternal();
CancelableClosureHolder cancelable_run_internal_;
base::RepeatingClosure callback_;
base::TimeTicks deadline_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
};
} // namespace scheduler
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_DEADLINE_TASK_RUNNER_H_
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