HTML MessagePort as mojo::MessagePipeHandle

content/browser/message_port_service.h

-// Copyright 2013 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 CONTENT_BROWSER_MESSAGE_PORT_SERVICE_H_
-#define CONTENT_BROWSER_MESSAGE_PORT_SERVICE_H_
-
-#include <map>
-#include <utility>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/singleton.h"
-#include "base/strings/string16.h"
-#include "content/common/content_export.h"
-#include "ipc/ipc_message.h"
-
-namespace content {
-class MessagePortDelegate;
-
-class CONTENT_EXPORT MessagePortService {
- public:
-  typedef std::vector<std::pair<base::string16, std::vector<int>>>
-      QueuedMessages;
-
-  // Returns the MessagePortService singleton.
-  static MessagePortService* GetInstance();
-
-  // These methods correspond to the message port related IPCs.
-  void Create(int route_id,
-              MessagePortDelegate* delegate,
-              int* message_port_id);
-  void Destroy(int message_port_id);
-  void Entangle(int local_message_port_id, int remote_message_port_id);
-  void PostMessage(
-      int sender_message_port_id,
-      const base::string16& message,
-      const std::vector<int>& sent_message_ports);
-  void QueueMessages(int message_port_id);
-  void SendQueuedMessages(int message_port_id,
-                          const QueuedMessages& queued_messages);
-  void ReleaseMessages(int message_port_id);
-
-  // Updates the information needed to reach a message port when it's sent to a
-  // (possibly different) process.
-  void UpdateMessagePort(int message_port_id,
-                         MessagePortDelegate* delegate,
-                         int routing_id);
-
-  // Returns the current information by which a message port can be reached.
-  // Either |delegate| or |routing_id| can be null, in which case that bit of
-  // information is not returned.
-  void GetMessagePortInfo(int message_port_id,
-                          MessagePortDelegate** delegate,
-                          int* routing_id);
-
-  // The message port is being transferred to a new renderer process, but the
-  // code doing that isn't able to immediately update the message port with a
-  // new filter and routing_id. This queues up all messages sent to this port
-  // until later ReleaseMessages is called for this port (this will happen
-  // automatically as soon as a WebMessagePortChannelImpl instance is created
-  // for this port in the renderer. The browser side code is still responsible
-  // for updating the port with a new filter before that happens. If ultimately
-  // transfering the port to a new process fails, ClosePort should be called to
-  // clean up the port.
-  void HoldMessages(int message_port_id);
-
-  // Returns true if messages for a message port are on hold.
-  bool AreMessagesHeld(int message_port_id);
-
-  // Closes and cleans up the message port.
-  void ClosePort(int message_port_id);
-
-  void OnMessagePortDelegateClosing(MessagePortDelegate* filter);
-
-  // Attempts to send the queued messages for a message port.
-  void SendQueuedMessagesIfPossible(int message_port_id);
-
- private:
-  friend struct base::DefaultSingletonTraits<MessagePortService>;
-
-  MessagePortService();
-  ~MessagePortService();
-
-  void PostMessageTo(
-      int message_port_id,
-      const base::string16& message,
-      const std::vector<int>& sent_message_ports);
-
-  // Handles the details of removing a message port id. Before calling this,
-  // verify that the message port id exists.
-  void Erase(int message_port_id);
-
-  struct MessagePort;
-  typedef std::map<int, MessagePort> MessagePorts;
-  MessagePorts message_ports_;
-
-  // We need globally unique identifiers for each message port.
-  int next_message_port_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessagePortService);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MESSAGE_PORT_SERVICE_H_