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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMECAST_BASE_THREAD_HEALTH_CHECKER_H_
#define CHROMECAST_BASE_THREAD_HEALTH_CHECKER_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
namespace base {
class OneShotTimer;
class SequencedTaskRunner;
class TaskRunner;
} // namespace base
namespace chromecast {
// A class used to periodically check the responsiveness of a thread.
//
// The class takes two task runners, a "patient", and a "doctor". The doctor
// task runner will post a "sentinel" task to the patient and verify that it
// gets run within a certain response time, determined by |timeout|.
// If the task is not run in time, then the patient fails the health checkup and
// |on_failure| is invoked.
//
// The thread health is checked periodically, with the length between one check
// and the next determined by |interval|, and the amount of time allowed for the
// sentinel task to complete determined by |timeout|.
class ThreadHealthChecker {
public:
ThreadHealthChecker(
scoped_refptr<base::TaskRunner> patient_task_runner,
scoped_refptr<base::SequencedTaskRunner> doctor_task_runner,
base::TimeDelta interval,
base::TimeDelta timeout,
base::RepeatingClosure on_failure);
ThreadHealthChecker(const ThreadHealthChecker&) = delete;
ThreadHealthChecker& operator=(const ThreadHealthChecker&) = delete;
~ThreadHealthChecker();
private:
class Internal : public base::RefCountedThreadSafe<Internal> {
public:
Internal(scoped_refptr<base::TaskRunner> patient_task_runner,
scoped_refptr<base::SequencedTaskRunner> doctor_task_runner,
base::TimeDelta interval,
base::TimeDelta timeout,
base::RepeatingClosure on_failure);
void StartHealthCheck();
void StopHealthCheck();
private:
friend class base::RefCountedThreadSafe<Internal>;
~Internal();
void ScheduleHealthCheck();
void CheckThreadHealth();
void ThreadOk();
void ThreadTimeout();
scoped_refptr<base::TaskRunner> patient_task_runner_;
scoped_refptr<base::SequencedTaskRunner> doctor_task_runner_;
base::TimeDelta interval_;
base::TimeDelta timeout_;
std::unique_ptr<base::OneShotTimer> ok_timer_;
std::unique_ptr<base::OneShotTimer> failure_timer_;
base::RepeatingClosure on_failure_;
THREAD_CHECKER(thread_checker_);
};
scoped_refptr<base::SequencedTaskRunner> doctor_task_runner_;
scoped_refptr<Internal> internal_;
};
} // namespace chromecast
#endif // CHROMECAST_BASE_THREAD_HEALTH_CHECKER_H_
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