src/base/message_loop/message_loop_proxy_impl.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_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_IMPL_H_
   6 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_IMPL_H_
   7
   8 #include "base/base_export.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/message_loop/message_loop_proxy.h"
  11 #include "base/pending_task.h"
  12 #include "base/threading/platform_thread.h"
  13
  14 namespace base {
  15 namespace internal {
  16
  17 class IncomingTaskQueue;
  18
  19 // A stock implementation of MessageLoopProxy that is created and managed by a
  20 // MessageLoop. For now a MessageLoopProxyImpl can only be created as part of a
  21 // MessageLoop.
  22 class BASE_EXPORT MessageLoopProxyImpl : public MessageLoopProxy {
  23  public:
  24   explicit MessageLoopProxyImpl(
  25       scoped_refptr<IncomingTaskQueue> incoming_queue);
  26
  27   // MessageLoopProxy implementation
  28   bool PostDelayedTask(const tracked_objects::Location& from_here,
  29                        const base::Closure& task,
  30                        base::TimeDelta delay) override;
  31   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
  32                                   const base::Closure& task,
  33                                   base::TimeDelta delay) override;
  34   bool RunsTasksOnCurrentThread() const override;
  35
  36  private:
  37   friend class RefCountedThreadSafe<MessageLoopProxyImpl>;
  38   ~MessageLoopProxyImpl() override;
  39
  40   // THe incoming queue receiving all posted tasks.
  41   scoped_refptr<IncomingTaskQueue> incoming_queue_;
  42
  43   // ID of the thread |this| was created on.
  44   PlatformThreadId valid_thread_id_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(MessageLoopProxyImpl);
  47 };
  48
  49 }  // namespace internal
  50 }  // namespace base
  51
  52 #endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_IMPL_H_