content/browser/renderer_host/java/java_bridge_dispatcher_host.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_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_H_
   7
   8 #include <vector>
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "base/strings/string16.h"
  12 #include "content/child/npapi/npobject_stub.h"
  13
  14 class RouteIDGenerator;
  15 struct NPObject;
  16
  17 namespace IPC {
  18 class Message;
  19 }
  20
  21 namespace content {
  22 class NPChannelBase;
  23 class RenderFrameHost;
  24 struct NPVariant_Param;
  25
  26 // This class handles injecting Java objects into a single RenderFrame. The Java
  27 // object itself lives in the browser process on a background thread, while a
  28 // proxy object is created in the renderer. An instance of this class exists
  29 // for each RenderViewHost.
  30 class JavaBridgeDispatcherHost
  31     : public base::RefCountedThreadSafe<JavaBridgeDispatcherHost> {
  32  public:
  33   // We hold a weak pointer to the RenderFrameHost. It must outlive this object.
  34   explicit JavaBridgeDispatcherHost(RenderFrameHost* render_frame_host);
  35
  36   // Injects |object| into the main frame of the corresponding RenderView. A
  37   // proxy object is created in the renderer and when the main frame's window
  38   // object is next cleared, this proxy object is bound to the window object
  39   // using |name|. The proxy object remains bound until the next time the
  40   // window object is cleared after a call to RemoveNamedObject() or
  41   // AddNamedObject() with the same name. The proxy object proxies calls back
  42   // to |object|, which is manipulated on the background thread. This class
  43   // holds a reference to |object| for the time that the proxy object is bound
  44   // to the window object.
  45   void AddNamedObject(const base::string16& name, NPObject* object);
  46   void RemoveNamedObject(const base::string16& name);
  47
  48   // Since this object is ref-counted, it might outlive render_frame_host.
  49   void RenderFrameDeleted();
  50
  51   void OnGetChannelHandle(IPC::Message* reply_msg);
  52
  53  private:
  54   friend class base::RefCountedThreadSafe<JavaBridgeDispatcherHost>;
  55   virtual ~JavaBridgeDispatcherHost();
  56
  57   void Send(IPC::Message* msg);
  58
  59   void GetChannelHandle(IPC::Message* reply_msg);
  60   void CreateNPVariantParam(NPObject* object, NPVariant_Param* param);
  61   void CreateObjectStub(NPObject* object, int render_process_id, int route_id);
  62
  63   scoped_refptr<NPChannelBase> channel_;
  64   RenderFrameHost* render_frame_host_;
  65   std::vector<base::WeakPtr<NPObjectStub> > stubs_;
  66
  67   DISALLOW_COPY_AND_ASSIGN(JavaBridgeDispatcherHost);
  68 };
  69
  70 }  // namespace content
  71
  72 #endif  // CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_H_