content/common/mojo/channel_init.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 CONTENT_COMMON_MOJO_CHANNEL_INIT_H_
   6 #define CONTENT_COMMON_MOJO_CHANNEL_INIT_H_
   7
   8 #include "base/files/file.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "content/common/content_export.h"
  12 #include "ipc/mojo/scoped_ipc_support.h"
  13 #include "third_party/mojo/src/mojo/edk/embedder/channel_info_forward.h"
  14 #include "third_party/mojo/src/mojo/public/cpp/system/message_pipe.h"
  15
  16 namespace base {
  17 class TaskRunner;
  18 }
  19
  20 namespace content {
  21
  22 // ChannelInit handles creation and destruction of the Mojo channel. It is not
  23 // thread-safe, but may be used on any single thread with a MessageLoop.
  24 class CONTENT_EXPORT ChannelInit {
  25  public:
  26   ChannelInit();
  27   ~ChannelInit();
  28
  29   // Initializes the channel. This takes ownership of |file|. Returns the
  30   // primordial MessagePipe for the channel.
  31   mojo::ScopedMessagePipeHandle Init(
  32       base::PlatformFile file,
  33       scoped_refptr<base::TaskRunner> io_thread_task_runner);
  34
  35   // Notifies the channel that we (hence it) will soon be destroyed.
  36   void WillDestroySoon();
  37
  38   // Shuts down the channel. Must be called from the IO thread.
  39   void ShutdownOnIOThread();
  40
  41  private:
  42   // Invoked on the thread on which this object lives once the channel has been
  43   // established. This is a static method that takes a weak pointer to self,
  44   // since we want to destroy the channel if we were destroyed first.
  45   static void OnCreatedChannel(
  46       base::WeakPtr<ChannelInit> self,
  47       scoped_ptr<IPC::ScopedIPCSupport> ipc_support,
  48       mojo::embedder::ChannelInfo* channel);
  49
  50   // If non-null the channel has been established.
  51   mojo::embedder::ChannelInfo* channel_info_;
  52
  53   scoped_ptr<IPC::ScopedIPCSupport> ipc_support_;
  54   base::WeakPtrFactory<ChannelInit> weak_factory_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(ChannelInit);
  57 };
  58
  59 }  // namespace content
  60
  61 #endif  // CONTENT_COMMON_MOJO_CHANNEL_INIT_H_