components/scheduler/child/webthread_base.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_SCHEDULER_CHILD_WEBTHREAD_BASE_H_
   6 #define COMPONENTS_SCHEDULER_CHILD_WEBTHREAD_BASE_H_
   7
   8 #include <map>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/threading/thread.h"
  12 #include "components/scheduler/scheduler_export.h"
  13 #include "third_party/WebKit/public/platform/WebThread.h"
  14
  15 namespace blink {
  16 class WebTraceLocation;
  17 }
  18
  19 namespace scheduler {
  20 class SingleThreadIdleTaskRunner;
  21
  22 class SCHEDULER_EXPORT WebThreadBase : public blink::WebThread {
  23  public:
  24   virtual ~WebThreadBase();
  25
  26   // blink::WebThread implementation.
  27   virtual bool isCurrentThread() const;
  28   virtual blink::PlatformThreadId threadId() const = 0;
  29
  30   virtual void postIdleTask(const blink::WebTraceLocation& location,
  31                             IdleTask* idle_task);
  32   virtual void postIdleTaskAfterWakeup(const blink::WebTraceLocation& location,
  33                                        IdleTask* idle_task);
  34
  35   virtual void addTaskObserver(TaskObserver* observer);
  36   virtual void removeTaskObserver(TaskObserver* observer);
  37
  38   // Returns the base::Bind-compatible task runner for posting tasks to this
  39   // thread. Can be called from any thread.
  40   virtual base::SingleThreadTaskRunner* TaskRunner() const = 0;
  41
  42   // Returns the base::Bind-compatible task runner for posting idle tasks to
  43   // this thread. Can be called from any thread.
  44   virtual scheduler::SingleThreadIdleTaskRunner* IdleTaskRunner() const = 0;
  45
  46  protected:
  47   class TaskObserverAdapter;
  48
  49   WebThreadBase();
  50
  51   virtual void AddTaskObserverInternal(
  52       base::MessageLoop::TaskObserver* observer);
  53   virtual void RemoveTaskObserverInternal(
  54       base::MessageLoop::TaskObserver* observer);
  55
  56   static void RunWebThreadIdleTask(
  57       scoped_ptr<blink::WebThread::IdleTask> idle_task,
  58       base::TimeTicks deadline);
  59
  60  private:
  61   typedef std::map<TaskObserver*, TaskObserverAdapter*> TaskObserverMap;
  62   TaskObserverMap task_observer_map_;
  63 };
  64
  65 }  // namespace scheduler
  66
  67 #endif  // COMPONENTS_SCHEDULER_CHILD_WEBTHREAD_BASE_H_