content/child/webmessageportchannel_impl.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_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_
   6 #define CONTENT_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_
   7
   8 #include <queue>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/strings/string16.h"
  14 #include "base/synchronization/lock.h"
  15 #include "ipc/ipc_listener.h"
  16 #include "third_party/WebKit/public/platform/WebMessagePortChannel.h"
  17
  18 namespace base {
  19 class MessageLoopProxy;
  20 }
  21
  22 namespace content {
  23 class ChildThread;
  24
  25 // This is thread safe.
  26 class WebMessagePortChannelImpl
  27     : public blink::WebMessagePortChannel,
  28       public IPC::Listener,
  29       public base::RefCountedThreadSafe<WebMessagePortChannelImpl> {
  30  public:
  31   explicit WebMessagePortChannelImpl(base::MessageLoopProxy* child_thread_loop);
  32   WebMessagePortChannelImpl(int route_id,
  33                             int message_port_id,
  34                             base::MessageLoopProxy* child_thread_loop);
  35
  36   static void CreatePair(base::MessageLoopProxy* child_thread_loop,
  37                          blink::WebMessagePortChannel** channel1,
  38                          blink::WebMessagePortChannel** channel2);
  39
  40   // Extracts port IDs for passing on to the browser process, and queues any
  41   // received messages. Takes ownership of the passed array (and deletes it).
  42   static std::vector<int> ExtractMessagePortIDs(
  43       blink::WebMessagePortChannelArray* channels);
  44
  45   // Queues received and incoming messages until there are no more in-flight
  46   // messages, then sends all of them to the browser process.
  47   void QueueMessages();
  48   int message_port_id() const { return message_port_id_; }
  49
  50  private:
  51   friend class base::RefCountedThreadSafe<WebMessagePortChannelImpl>;
  52   virtual ~WebMessagePortChannelImpl();
  53
  54   // WebMessagePortChannel implementation.
  55   virtual void setClient(blink::WebMessagePortChannelClient* client);
  56   virtual void destroy();
  57   virtual void postMessage(const blink::WebString& message,
  58                            blink::WebMessagePortChannelArray* channels);
  59   virtual bool tryGetMessage(blink::WebString* message,
  60                              blink::WebMessagePortChannelArray& channels);
  61
  62   void Init();
  63   void Entangle(scoped_refptr<WebMessagePortChannelImpl> channel);
  64   void Send(IPC::Message* message);
  65   void PostMessage(const base::string16& message,
  66                    blink::WebMessagePortChannelArray* channels);
  67
  68   // IPC::Listener implementation.
  69   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  70
  71   void OnMessage(const base::string16& message,
  72                  const std::vector<int>& sent_message_port_ids,
  73                  const std::vector<int>& new_routing_ids);
  74   void OnMessagesQueued();
  75
  76   struct Message {
  77     Message();
  78     ~Message();
  79
  80     base::string16 message;
  81     std::vector<WebMessagePortChannelImpl*> ports;
  82   };
  83
  84   typedef std::queue<Message> MessageQueue;
  85   MessageQueue message_queue_;
  86
  87   blink::WebMessagePortChannelClient* client_;
  88   base::Lock lock_;  // Locks access to above.
  89
  90   int route_id_;  // The routing id for this object.
  91   int message_port_id_;  // A globally unique identifier for this message port.
  92   scoped_refptr<base::MessageLoopProxy> child_thread_loop_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(WebMessagePortChannelImpl);
  95 };
  96
  97 }  // namespace content
  98
  99 #endif  // CONTENT_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_