[Android] Java Bridge with Gin: implement Java Bridge dispatcher

content/browser/renderer_host/java/gin_java_bridge_dispatcher_host.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_JAVA_GIN_JAVA_BRIDGE_DISPATCHER_HOST_H_
+#define CONTENT_BROWSER_RENDERER_HOST_JAVA_GIN_JAVA_BRIDGE_DISPATCHER_HOST_H_
+
+#include <map>
+#include <set>
+
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/browser/renderer_host/java/gin_java_bound_object.h"
+#include "content/browser/renderer_host/java/gin_java_method_invocation_helper.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace IPC {
+class Message;
+}
+
+namespace content {
+
+// This class handles injecting Java objects into a single RenderView. The Java
+// object itself lives in the browser process on a background thread, while a
+// proxy object is created in the renderer. An instance of this class exists
+// for each RenderFrameHost.
+class GinJavaBridgeDispatcherHost
+    : public base::SupportsWeakPtr<GinJavaBridgeDispatcherHost>,
+      public WebContentsObserver,
+      public GinJavaMethodInvocationHelper::DispatcherDelegate {
+ public:
+
+  GinJavaBridgeDispatcherHost(WebContents* web_contents,
+                              jobject retained_object_set);
+  virtual ~GinJavaBridgeDispatcherHost();
+
+  void AddNamedObject(
+      const std::string& name,
+      const base::android::JavaRef<jobject>& object,
+      const base::android::JavaRef<jclass>& safe_annotation_clazz);
+  void RemoveNamedObject(const std::string& name);
+  void SetAllowObjectContentsInspection(bool allow);
+
+  // WebContentsObserver
+  virtual void RenderFrameCreated(RenderFrameHost* render_frame_host) OVERRIDE;
+  virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) OVERRIDE;
+  virtual void DocumentAvailableInMainFrame() OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 RenderFrameHost* render_frame_host) OVERRIDE;
+
+  // GinJavaMethodInvocationHelper::DispatcherDelegate
+  virtual JavaObjectWeakGlobalRef GetObjectWeakRef(
+      GinJavaBoundObject::ObjectID object_id) OVERRIDE;
+
+  void OnGetMethods(RenderFrameHost* render_frame_host,
+                    GinJavaBoundObject::ObjectID object_id,
+                    IPC::Message* reply_msg);
+  void OnHasMethod(RenderFrameHost* render_frame_host,
+                   GinJavaBoundObject::ObjectID object_id,
+                   const std::string& method_name,
+                   IPC::Message* reply_msg);
+  void OnInvokeMethod(RenderFrameHost* render_frame_host,
+                      GinJavaBoundObject::ObjectID object_id,
+                      const std::string& method_name,
+                      const base::ListValue& arguments,
+                      IPC::Message* reply_msg);
+
+ private:
+  typedef std::set<RenderFrameHost*> RendererSet;
+  void OnObjectWrapperDeleted(RenderFrameHost* render_frame_host,
+                              GinJavaBoundObject::ObjectID object_id);
+
+  void SendReply(RenderFrameHost* render_frame_host, IPC::Message* reply_msg);
+  void SendMethods(RenderFrameHost* render_frame_host,
+                   IPC::Message* reply_msg,
+                   const std::set<std::string>& method_names);
+  void SendHasMethodReply(RenderFrameHost* render_frame_host,
+                          IPC::Message* reply_msg,
+                          bool result);
+  void ProcessMethodInvocationResult(
+      RenderFrameHost* render_frame_host,
+      IPC::Message* reply_msg,
+      scoped_refptr<GinJavaMethodInvocationHelper> result);
+  void ProcessMethodInvocationObjectResult(
+      RenderFrameHost* render_frame_host,
+      IPC::Message* reply_msg,
+      scoped_refptr<GinJavaMethodInvocationHelper> result);
+  GinJavaBoundObject::ObjectID AddObject(
+      const base::android::JavaRef<jobject>& object,
+      const base::android::JavaRef<jclass>& safe_annotation_clazz,
+      bool is_named,
+      RenderFrameHost* holder);
+  bool FindObjectId(const base::android::JavaRef<jobject>& object,
+                    GinJavaBoundObject::ObjectID* object_id);
+  void RemoveHolder(RenderFrameHost* holder,
+                    const GinJavaBoundObject::ObjectMap::iterator& from,
+                    size_t count);
+
+  // Every time a GinJavaBoundObject backed by a real Java object is
+  // created/destroyed, we insert/remove a strong ref to that Java object into
+  // this set so that it doesn't get garbage collected while it's still
+  // potentially in use. Although the set is managed native side, it's owned
+  // and defined in Java so that pushing refs into it does not create new GC
+  // roots that would prevent ContentViewCore from being garbage collected.
+  JavaObjectWeakGlobalRef retained_object_set_;
+  bool allow_object_contents_inspection_;
+  RendererSet renderers_;
+  GinJavaBoundObject::ObjectMap objects_;
+  typedef std::map<std::string, GinJavaBoundObject::ObjectID> NamedObjectMap;
+  NamedObjectMap named_objects_;
+
+  DISALLOW_COPY_AND_ASSIGN(GinJavaBridgeDispatcherHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_JAVA_GIN_JAVA_BRIDGE_DISPATCHER_HOST_H_