Fold media::MessageLoopFactoryImpl into media::MessageLoopFactory.

media/base/message_loop_factory.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_
 #define MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_
 
+#include <map>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop_proxy.h"
+#include "base/synchronization/lock.h"
 #include "media/base/media_export.h"
 
 class MessageLoop;
 
+namespace base {
+class Thread;
+}
+
 namespace media {
 
 // Factory object that manages named MessageLoops.
+//
+// TODO(scherkus): replace this with something simpler http://crbug.com/116873
 class MEDIA_EXPORT MessageLoopFactory {
  public:
+  MessageLoopFactory();
+
   // Get the message loop associated with |name|. A new MessageLoop
   // is created if the factory doesn't have one associated with |name|.
-  // NULL is returned if |name| is an empty string, or a new
-  // MessageLoop needs to be created and a failure occurs during the
-  // creation process.
-  virtual MessageLoop* GetMessageLoop(const std::string& name) = 0;
+  //
+  // |name| must not be an empty string.
+  MessageLoop* GetMessageLoop(const std::string& name);
 
   // Get the message loop proxy associated with |name|. A new MessageLoopProxy
   // is created if the factory doesn't have one associated with |name|.
-  // NULL is returned if |name| is an empty string, or a new
-  // MessageLoop needs to be created and a failure occurs during the
-  // creation process.
-  virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoopProxy(
-      const std::string& name) = 0;
+  //
+  // |name| must not be an empty string.
+  scoped_refptr<base::MessageLoopProxy> GetMessageLoopProxy(
+      const std::string& name);
 
- protected:
+ private:
   // Only allow scoped_ptr<> to delete factory.
   friend class scoped_ptr<MessageLoopFactory>;
-  virtual ~MessageLoopFactory();
+  ~MessageLoopFactory();
+
+  // Returns the thread associated with |name| creating a new thread if needed.
+  base::Thread* GetThread(const std::string& name);
+
+  // Lock used to serialize access for the following data members.
+  base::Lock lock_;
+
+  typedef std::map<std::string, base::Thread*> ThreadMap;
+  ThreadMap thread_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(MessageLoopFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_