[mojo] Ports EDK

mojo/edk/system/remote_message_pipe_bootstrap.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_EDK_SYSTEM_REMOTE_MESSAGE_PIPE_BOOTSTRAP_H_
+#define MOJO_EDK_SYSTEM_REMOTE_MESSAGE_PIPE_BOOTSTRAP_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
+#include "base/task_runner.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
+#include "mojo/edk/system/channel.h"
+#include "mojo/edk/system/ports/port_ref.h"
+
+namespace mojo {
+namespace edk {
+
+class NodeController;
+
+// This is used by Core to negotiate a new cross-process message pipe given
+// an arbitrary platform channel. One end of the channel must be passed to
+// CreateForParent() in the parent process, and the other end must be passed to
+// CreateForChild() in the child process.
+class RemoteMessagePipeBootstrap
+    : public Channel::Delegate,
+      public base::MessageLoop::DestructionObserver {
+ public:
+  ~RemoteMessagePipeBootstrap() override;
+
+  // The NodeController should already have reserved a local port for |token|
+  // before calling this method.
+  static void CreateForParent(NodeController* node_controller,
+                              ScopedPlatformHandle platform_handle,
+                              const std::string& token);
+
+  // |port| must be a reference to an uninitialized local port.
+  static void CreateForChild(NodeController* node_controller,
+                             ScopedPlatformHandle platform_handle,
+                             const ports::PortRef& port,
+                             const base::Closure& callback);
+
+  // Handle a received token.
+  virtual void OnTokenReceived(const std::string& token) = 0;
+
+ protected:
+  explicit RemoteMessagePipeBootstrap(ScopedPlatformHandle platform_handle);
+
+  void ShutDown();
+
+  bool shutting_down_ = false;
+  scoped_refptr<base::TaskRunner> io_task_runner_;
+  scoped_refptr<Channel> channel_;
+
+ private:
+  // base::MessageLoop::DestructionObserver:
+  void WillDestroyCurrentMessageLoop() override;
+
+  // Channel::Delegate:
+  void OnChannelMessage(const void* payload,
+                        size_t payload_size,
+                        ScopedPlatformHandleVectorPtr handles) override;
+  void OnChannelError() override;
+
+  void ShutDownNow();
+
+  DISALLOW_COPY_AND_ASSIGN(RemoteMessagePipeBootstrap);
+};
+
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_REMOTE_MESSAGE_PIPE_BOOTSTRAP_H_