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