1 // Copyright 2013 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 WEBKIT_BROWSER_FILEAPI_TIMED_TASK_HELPER_H_ 6 #define WEBKIT_BROWSER_FILEAPI_TIMED_TASK_HELPER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/callback.h" 10 #include "base/location.h" 11 #include "base/memory/ref_counted.h" 12 #include "base/memory/scoped_ptr.h" 13 #include "base/time/time.h" 14 #include "webkit/browser/webkit_storage_browser_export.h" 15 16 namespace base { 17 class SequencedTaskRunner; 18 } 19 20 namespace fileapi { 21 22 // Works similarly as base::Timer, but takes SequencedTaskRunner and 23 // runs tasks on it (instead of implicitly bound to a thread). 24 // TODO(kinuko): This has nothing to do with fileapi. Move somewhere 25 // more common place. 26 class WEBKIT_STORAGE_BROWSER_EXPORT TimedTaskHelper { 27 public: 28 explicit TimedTaskHelper(base::SequencedTaskRunner* task_runner); 29 ~TimedTaskHelper(); 30 31 bool IsRunning() const; 32 void Start(const tracked_objects::Location& posted_from, 33 base::TimeDelta delay, 34 const base::Closure& user_task); 35 void Reset(); 36 37 private: 38 struct Tracker; 39 static void Fired(scoped_ptr<Tracker> tracker); 40 41 void OnFired(scoped_ptr<Tracker> tracker); 42 void PostDelayedTask(scoped_ptr<Tracker> tracker, base::TimeDelta delay); 43 44 scoped_refptr<base::SequencedTaskRunner> task_runner_; 45 tracked_objects::Location posted_from_; 46 base::TimeDelta delay_; 47 base::Closure user_task_; 48 49 base::TimeTicks desired_run_time_; 50 51 // This is set to non-null and owned by a timer task while timer is running. 52 Tracker* tracker_; 53 54 DISALLOW_COPY_AND_ASSIGN(TimedTaskHelper); 55 }; 56 57 } // namespace fileapi 58 59 #endif // WEBKIT_BROWSER_FILEAPI_TIMED_TASK_HELPER_H_ 60