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   // Queues received and incoming messages until there are no more in-flight
  37   // messages, then sends all of them to the browser process.
  38   void QueueMessages();
  39   int message_port_id() const { return message_port_id_; }
  40
  41  private:
  42   friend class base::RefCountedThreadSafe<WebMessagePortChannelImpl>;
  43   virtual ~WebMessagePortChannelImpl();
  44
  45   // WebMessagePortChannel implementation.
  46   virtual void setClient(blink::WebMessagePortChannelClient* client);
  47   virtual void destroy();
  48   virtual void entangle(blink::WebMessagePortChannel* channel);
  49   virtual void postMessage(const blink::WebString& message,
  50                            blink::WebMessagePortChannelArray* channels);
  51   virtual bool tryGetMessage(blink::WebString* message,
  52                              blink::WebMessagePortChannelArray& channels);
  53
  54   void Init();
  55   void Entangle(scoped_refptr<WebMessagePortChannelImpl> channel);
  56   void Send(IPC::Message* message);
  57
  58   // IPC::Listener implementation.
  59   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  60
  61   void OnMessage(const base::string16& message,
  62                  const std::vector<int>& sent_message_port_ids,
  63                  const std::vector<int>& new_routing_ids);
  64   void OnMessagesQueued();
  65
  66   struct Message {
  67     Message();
  68     ~Message();
  69
  70     base::string16 message;
  71     std::vector<WebMessagePortChannelImpl*> ports;
  72   };
  73
  74   typedef std::queue<Message> MessageQueue;
  75   MessageQueue message_queue_;
  76
  77   blink::WebMessagePortChannelClient* client_;
  78   base::Lock lock_;  // Locks access to above.
  79
  80   int route_id_;  // The routing id for this object.
  81   int message_port_id_;  // A globally unique identifier for this message port.
  82   scoped_refptr<base::MessageLoopProxy> child_thread_loop_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(WebMessagePortChannelImpl);
  85 };
  86
  87 }  // namespace content
  88
  89 #endif  // CONTENT_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_