components/scheduler/child/scheduler_task_runner_delegate.h

   1 // Copyright 2015 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_SCHEDULER_TASK_RUNNER_DELEGATE_H_
   6 #define COMPONENTS_SCHEDULER_CHILD_SCHEDULER_TASK_RUNNER_DELEGATE_H_
   7
   8 #include "base/message_loop/message_loop.h"
   9 #include "components/scheduler/child/nestable_single_thread_task_runner.h"
  10 #include "components/scheduler/scheduler_export.h"
  11
  12 namespace scheduler {
  13
  14 class SCHEDULER_EXPORT SchedulerTaskRunnerDelegate
  15     : public NestableSingleThreadTaskRunner {
  16  public:
  17   SchedulerTaskRunnerDelegate() {}
  18
  19   // If the underlying task runner supports the concept of a default task
  20   // runner, the delegate should implement this function to redirect that task
  21   // runner to the scheduler.
  22   virtual void SetDefaultTaskRunner(
  23       scoped_refptr<base::SingleThreadTaskRunner> task_runner) = 0;
  24
  25   // Similarly this method can be used to restore the original task runner when
  26   // the scheduler no longer wants to intercept tasks.
  27   virtual void RestoreDefaultTaskRunner() = 0;
  28
  29  protected:
  30   ~SchedulerTaskRunnerDelegate() override {}
  31
  32   DISALLOW_COPY_AND_ASSIGN(SchedulerTaskRunnerDelegate);
  33 };
  34
  35 }  // namespace scheduler
  36
  37 #endif  // COMPONENTS_SCHEDULER_CHILD_SCHEDULER_TASK_RUNNER_DELEGATE_H_