content/browser/worker_host/message_port_service.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 CONTENT_BROWSER_WORKER_HOST_MESSAGE_PORT_SERVICE_H_
   6 #define CONTENT_BROWSER_WORKER_HOST_MESSAGE_PORT_SERVICE_H_
   7
   8 #include <map>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/memory/singleton.h"
  14 #include "base/strings/string16.h"
  15 #include "ipc/ipc_message.h"
  16
  17 namespace content {
  18 class WorkerMessageFilter;
  19
  20 class MessagePortService {
  21  public:
  22   typedef std::vector<std::pair<string16, std::vector<int> > > QueuedMessages;
  23
  24   // Returns the MessagePortService singleton.
  25   static MessagePortService* GetInstance();
  26
  27   // These methods correspond to the message port related IPCs.
  28   void Create(int route_id, WorkerMessageFilter* filter, int* message_port_id);
  29   void Destroy(int message_port_id);
  30   void Entangle(int local_message_port_id, int remote_message_port_id);
  31   void PostMessage(int sender_message_port_id,
  32                    const string16& message,
  33                    const std::vector<int>& sent_message_port_ids);
  34   void QueueMessages(int message_port_id);
  35   void SendQueuedMessages(int message_port_id,
  36                           const QueuedMessages& queued_messages);
  37
  38   // Updates the information needed to reach a message port when it's sent to a
  39   // (possibly different) process.
  40   void UpdateMessagePort(
  41       int message_port_id,
  42       WorkerMessageFilter* filter,
  43       int routing_id);
  44
  45   void OnWorkerMessageFilterClosing(WorkerMessageFilter* filter);
  46
  47   // Attempts to send the queued messages for a message port.
  48   void SendQueuedMessagesIfPossible(int message_port_id);
  49
  50  private:
  51   friend struct DefaultSingletonTraits<MessagePortService>;
  52
  53   MessagePortService();
  54   ~MessagePortService();
  55
  56   void PostMessageTo(int message_port_id,
  57                      const string16& message,
  58                      const std::vector<int>& sent_message_port_ids);
  59
  60   // Handles the details of removing a message port id. Before calling this,
  61   // verify that the message port id exists.
  62   void Erase(int message_port_id);
  63
  64   struct MessagePort;
  65   typedef std::map<int, MessagePort> MessagePorts;
  66   MessagePorts message_ports_;
  67
  68   // We need globally unique identifiers for each message port.
  69   int next_message_port_id_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(MessagePortService);
  72 };
  73
  74 }  // namespace content
  75
  76 #endif  // CONTENT_BROWSER_WORKER_HOST_MESSAGE_PORT_SERVICE_H_