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// Copyright 2014 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_CHILD_SINGLE_THREAD_IDLE_TASK_RUNNER_H_
#define COMPONENTS_SCHEDULER_CHILD_SINGLE_THREAD_IDLE_TASK_RUNNER_H_
#include "base/bind.h"
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "components/scheduler/scheduler_export.h"
namespace scheduler {
// A SingleThreadIdleTaskRunner is a task runner for running idle tasks. Idle
// tasks have an unbound argument which is bound to a deadline
// (in base::TimeTicks) when they are run. The idle task is expected to
// complete by this deadline.
class SingleThreadIdleTaskRunner
: public base::RefCountedThreadSafe<SingleThreadIdleTaskRunner> {
public:
typedef base::Callback<void(base::TimeTicks)> IdleTask;
// Used to request idle task deadlines and signal posting of idle tasks.
class SCHEDULER_EXPORT Delegate {
public:
Delegate();
virtual ~Delegate();
// Signals that an idle task has been posted. This will be called on the
// posting thread, which may not be the same thread as the
// SingleThreadIdleTaskRunner runs on.
virtual void OnIdleTaskPosted() = 0;
// Signals that a new idle task is about to be run and returns the deadline
// for this idle task.
virtual base::TimeTicks WillProcessIdleTask() = 0;
// Signals that an idle task has finished being run.
virtual void DidProcessIdleTask() = 0;
private:
DISALLOW_COPY_AND_ASSIGN(Delegate);
};
// NOTE Category strings must have application lifetime (statics or
// literals). They may not include " chars.
SingleThreadIdleTaskRunner(
scoped_refptr<base::SingleThreadTaskRunner> idle_priority_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> after_wakeup_task_runner,
Delegate* Delegate,
const char* tracing_category);
virtual void PostIdleTask(const tracked_objects::Location& from_here,
const IdleTask& idle_task);
virtual void PostNonNestableIdleTask(
const tracked_objects::Location& from_here,
const IdleTask& idle_task);
virtual void PostIdleTaskAfterWakeup(
const tracked_objects::Location& from_here,
const IdleTask& idle_task);
bool RunsTasksOnCurrentThread() const;
protected:
virtual ~SingleThreadIdleTaskRunner();
private:
friend class base::RefCountedThreadSafe<SingleThreadIdleTaskRunner>;
void RunTask(IdleTask idle_task);
scoped_refptr<base::SingleThreadTaskRunner> idle_priority_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> after_wakeup_task_runner_;
Delegate* delegate_; // NOT OWNED
const char* tracing_category_;
base::WeakPtr<SingleThreadIdleTaskRunner> weak_scheduler_ptr_;
base::WeakPtrFactory<SingleThreadIdleTaskRunner> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(SingleThreadIdleTaskRunner);
};
} // namespace scheduler
#endif // COMPONENTS_SCHEDULER_CHILD_SINGLE_THREAD_IDLE_TASK_RUNNER_H_
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