base/test/null_task_runner.h

   1 // Copyright (c) 2012 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 BASE_TEST_NULL_TASK_RUNNER_H_
   6 #define BASE_TEST_NULL_TASK_RUNNER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/single_thread_task_runner.h"
  11
  12 namespace base {
  13
  14 // Helper class for tests that need to provide an implementation of a
  15 // *TaskRunner class but don't actually care about tasks being run.
  16
  17 class NullTaskRunner : public base::SingleThreadTaskRunner {
  18  public:
  19   NullTaskRunner();
  20
  21   bool PostDelayedTask(const tracked_objects::Location& from_here,
  22                        const base::Closure& task,
  23                        base::TimeDelta delay) override;
  24   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
  25                                   const base::Closure& task,
  26                                   base::TimeDelta delay) override;
  27   // Always returns true to avoid triggering DCHECKs.
  28   bool RunsTasksOnCurrentThread() const override;
  29
  30  protected:
  31   ~NullTaskRunner() override;
  32
  33   DISALLOW_COPY_AND_ASSIGN(NullTaskRunner);
  34 };
  35
  36 }  // namespace base
  37
  38 #endif  // BASE_TEST_NULL_TASK_RUNNER_H_