| // 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_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_DEADLINE_TASK_RUNNER_H_ |
| #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_DEADLINE_TASK_RUNNER_H_ |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/time/time.h" |
| #include "platform/PlatformExport.h" |
| #include "platform/scheduler/base/cancelable_closure_holder.h" |
| |
| namespace blink { |
| namespace scheduler { |
| |
| // Runs a posted task at latest by a given deadline, but possibly sooner. |
| class PLATFORM_EXPORT DeadlineTaskRunner { |
| public: |
| DeadlineTaskRunner(const base::Closure& callback, |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner); |
| |
| ~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::Closure callback_; |
| base::TimeTicks deadline_; |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DeadlineTaskRunner); |
| }; |
| |
| } // namespace scheduler |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_DEADLINE_TASK_RUNNER_H_ |