content/renderer/devtools/devtools_agent_filter.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_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_FILTER_H_
   6 #define CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_FILTER_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "ipc/message_filter.h"
  12
  13 struct DevToolsMessageData;
  14
  15 namespace base {
  16 class MessageLoop;
  17 class MessageLoopProxy;
  18 }
  19
  20 namespace content {
  21
  22 // DevToolsAgentFilter is registered as an IPC filter in order to be able to
  23 // dispatch messages while on the IO thread. The reason for that is that while
  24 // debugging, Render thread is being held by the v8 and hence no messages
  25 // are being dispatched there. While holding the thread in a tight loop,
  26 // v8 provides thread-safe Api for controlling debugger. In our case v8's Api
  27 // is being used from this communication agent on the IO thread.
  28 class DevToolsAgentFilter : public IPC::MessageFilter {
  29  public:
  30   // There is a single instance of this class instantiated by the RenderThread.
  31   DevToolsAgentFilter();
  32
  33   static void SendRpcMessage(const DevToolsMessageData& data);
  34
  35   // IPC::MessageFilter override. Called on IO thread.
  36   virtual bool OnMessageReceived(const IPC::Message& message) override;
  37
  38   // Called on the main thread.
  39   void AddEmbeddedWorkerRouteOnMainThread(int32 routing_id);
  40   void RemoveEmbeddedWorkerRouteOnMainThread(int32 routing_id);
  41
  42  protected:
  43   virtual ~DevToolsAgentFilter();
  44
  45  private:
  46   void OnDispatchOnInspectorBackend(const std::string& message);
  47
  48   // Called on IO thread
  49   void AddEmbeddedWorkerRoute(int32 routing_id);
  50   void RemoveEmbeddedWorkerRoute(int32 routing_id);
  51
  52   bool message_handled_;
  53   base::MessageLoop* render_thread_loop_;
  54   // Proxy to the IO message loop.
  55   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
  56   int current_routing_id_;
  57
  58   std::set<int32> embedded_worker_routes_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(DevToolsAgentFilter);
  61 };
  62
  63 }  // namespace content
  64
  65 #endif  // CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_FILTER_H_