java_bridge_dispatcher_host_manager.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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_MANAGER_H_
6#define CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_MANAGER_H_
7
8#include <map>
9
10#include "base/android/jni_helper.h"
11#include "base/android/scoped_java_ref.h"
12#include "base/compiler_specific.h"
13#include "base/memory/ref_counted.h"
14#include "base/memory/weak_ptr.h"
15#include "base/string16.h"
16#include "content/public/browser/web_contents_observer.h"
17
18struct NPObject;
19
20namespace content {
21class JavaBridgeDispatcherHost;
22class RenderViewHost;
23
24// This class handles injecting Java objects into all of the RenderViews
25// associated with a WebContents. It manages a set of JavaBridgeDispatcherHost
26// objects, one per RenderViewHost.
27class JavaBridgeDispatcherHostManager
28    : public WebContentsObserver,
29      public base::SupportsWeakPtr<JavaBridgeDispatcherHostManager> {
30 public:
31  explicit JavaBridgeDispatcherHostManager(WebContents* web_contents);
32  virtual ~JavaBridgeDispatcherHostManager();
33
34  // These methods add or remove the object to each JavaBridgeDispatcherHost.
35  // Each one holds a reference to the NPObject while the object is bound to
36  // the corresponding RenderView. See JavaBridgeDispatcherHost for details.
37  void AddNamedObject(const string16& name, NPObject* object);
38  void RemoveNamedObject(const string16& name);
39
40  // Every time a JavaBoundObject backed by a real Java object is
41  // created/destroyed, we insert/remove a strong ref to that Java object into
42  // this set so that it doesn't get garbage collected while it's still
43  // potentially in use. Although the set is managed native side, it's owned
44  // and defined in Java so that pushing refs into it does not create new GC
45  // roots that would prevent ContentViewCore from being garbage collected.
46  void SetRetainedObjectSet(const JavaObjectWeakGlobalRef& retained_object_set);
47
48  // WebContentsObserver overrides
49  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
50  virtual void RenderViewDeleted(RenderViewHost* render_view_host) OVERRIDE;
51  virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE;
52  virtual void DocumentAvailableInMainFrame() OVERRIDE;
53
54  void JavaBoundObjectCreated(const base::android::JavaRef<jobject>& object);
55  void JavaBoundObjectDestroyed(const base::android::JavaRef<jobject>& object);
56
57 private:
58  typedef std::map<RenderViewHost*, scoped_refptr<JavaBridgeDispatcherHost> >
59      InstanceMap;
60  InstanceMap instances_;
61  typedef std::map<string16, NPObject*> ObjectMap;
62  ObjectMap objects_;
63  JavaObjectWeakGlobalRef retained_object_set_;
64
65  DISALLOW_COPY_AND_ASSIGN(JavaBridgeDispatcherHostManager);
66};
67
68}  // namespace content
69
70#endif  // CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_MANAGER_H_
71