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      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_MEDIA_MEDIA_INTERNALS_PROXY_H_
      6 #define CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_PROXY_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/sequenced_task_runner_helpers.h"
     10 #include "content/browser/media/media_internals.h"
     11 #include "content/public/browser/browser_thread.h"
     12 #include "content/public/browser/notification_observer.h"
     13 #include "content/public/browser/notification_registrar.h"
     14 #include "net/base/net_log.h"
     15 
     16 namespace base {
     17 class ListValue;
     18 class Value;
     19 }
     20 
     21 namespace content {
     22 class MediaInternalsMessageHandler;
     23 
     24 // This class is a proxy between MediaInternals (on the IO thread) and
     25 // MediaInternalsMessageHandler (on the UI thread).
     26 // It is ref_counted to ensure that it completes all pending Tasks on both
     27 // threads before destruction.
     28 class MediaInternalsProxy
     29     : public base::RefCountedThreadSafe<
     30           MediaInternalsProxy,
     31           BrowserThread::DeleteOnUIThread>,
     32       public net::NetLog::ThreadSafeObserver,
     33       public NotificationObserver {
     34  public:
     35   MediaInternalsProxy();
     36 
     37   // NotificationObserver implementation.
     38   virtual void Observe(int type,
     39                        const NotificationSource& source,
     40                        const NotificationDetails& details) OVERRIDE;
     41 
     42   // Register a Handler and start receiving callbacks from MediaInternals.
     43   void Attach(MediaInternalsMessageHandler* handler);
     44 
     45   // Unregister the same and stop receiving callbacks.
     46   void Detach();
     47 
     48   // Have MediaInternals send all the data it has.
     49   void GetEverything();
     50 
     51   // MediaInternals callback. Called on the IO thread.
     52   void OnUpdate(const base::string16& update);
     53 
     54   // net::NetLog::ThreadSafeObserver implementation. Callable from any thread:
     55   virtual void OnAddEntry(const net::NetLog::Entry& entry) OVERRIDE;
     56 
     57  private:
     58   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
     59   friend class base::DeleteHelper<MediaInternalsProxy>;
     60   virtual ~MediaInternalsProxy();
     61 
     62   // Build a dictionary mapping constant names to values.
     63   base::Value* GetConstants();
     64 
     65   void ObserveMediaInternalsOnIOThread();
     66   void StopObservingMediaInternalsOnIOThread();
     67   void GetEverythingOnIOThread();
     68   void UpdateUIOnUIThread(const base::string16& update);
     69 
     70   // Put |entry| on a list of events to be sent to the page.
     71   void AddNetEventOnUIThread(base::Value* entry);
     72 
     73   // Send all pending events to the page.
     74   void SendNetEventsOnUIThread();
     75 
     76   // Call a JavaScript function on the page. Takes ownership of |args|.
     77   void CallJavaScriptFunctionOnUIThread(const std::string& function,
     78                                         base::Value* args);
     79 
     80   MediaInternalsMessageHandler* handler_;
     81   scoped_ptr<base::ListValue> pending_net_updates_;
     82   NotificationRegistrar registrar_;
     83   MediaInternals::UpdateCallback update_callback_;
     84 
     85   DISALLOW_COPY_AND_ASSIGN(MediaInternalsProxy);
     86 };
     87 
     88 }  // namespace content
     89 
     90 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_PROXY_H_
     91