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 MessageLoopProxy;
  18 class TaskRunner;
  19 }
  20
  21 namespace content {
  22
  23 // ChannelInit handles creation and destruction of the Mojo channel. It is not
  24 // thread-safe, but may be used on any single thread with a MessageLoop.
  25 class CONTENT_EXPORT ChannelInit {
  26  public:
  27   ChannelInit();
  28   ~ChannelInit();
  29
  30   // Initializes the channel. This takes ownership of |file|. Returns the
  31   // primordial MessagePipe for the channel.
  32   mojo::ScopedMessagePipeHandle Init(
  33       base::PlatformFile file,
  34       scoped_refptr<base::TaskRunner> io_thread_task_runner);
  35
  36   // Notifies the channel that we (hence it) will soon be destroyed.
  37   void WillDestroySoon();
  38
  39   // Get/Set a shared I/O TaskRunner for children to use in single process mode.
  40   static scoped_refptr<base::TaskRunner> GetSingleProcessIOTaskRunner();
  41   static void SetSingleProcessIOTaskRunner(
  42       scoped_refptr<base::TaskRunner> io_task_runner);
  43
  44  private:
  45   // Invoked on the thread on which this object lives once the channel has been
  46   // established. This is a static method that takes a weak pointer to self,
  47   // since we want to destroy the channel if we were destroyed first.
  48   static void OnCreatedChannel(
  49       base::WeakPtr<ChannelInit> self,
  50       scoped_ptr<IPC::ScopedIPCSupport> ipc_support,
  51       mojo::embedder::ChannelInfo* channel);
  52
  53   // If non-null the channel has been established.
  54   mojo::embedder::ChannelInfo* channel_info_;
  55
  56   scoped_ptr<IPC::ScopedIPCSupport> ipc_support_;
  57   base::WeakPtrFactory<ChannelInit> weak_factory_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(ChannelInit);
  60 };
  61
  62 }  // namespace content
  63
  64 #endif  // CONTENT_COMMON_MOJO_CHANNEL_INIT_H_