Lazy-creates BluetoothAdapter in ExtensionBluetoothEventRouter (EBEE).

chrome/browser/extensions/bluetooth_event_router.h

 // 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 CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_
 
 #include <map>
+#include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/bluetooth.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_socket.h"
 
 namespace extensions {
 
 class ExtensionBluetoothEventRouter
     : public device::BluetoothAdapter::Observer {
  public:
   explicit ExtensionBluetoothEventRouter(Profile* profile);
   virtual ~ExtensionBluetoothEventRouter();
 
   // adapter() will return NULL if the bluetooth adapter is not supported in the
   // current platform.
-  const device::BluetoothAdapter* adapter() const {
-    return adapter_.get();
-  }
+  scoped_refptr<const device::BluetoothAdapter> adapter();
 
   // GetMutableAdapter will return NULL if the bluetooth adapter is not
   // supported in the current platform.
-  device::BluetoothAdapter* GetMutableAdapter() {
-    return adapter_.get();
-  }
+  scoped_refptr<device::BluetoothAdapter> GetMutableAdapter();
+
+  // Called when an event listener is added.
+  void OnEventListenerAdded(const std::string& event_name);
+
+  // Called when an event listener is removed.
+  void OnEventListenerRemoved(const std::string& event_name);
 
   // Register the BluetoothSocket |socket| for use by the extensions system.
   // This class will hold onto the socket for its lifetime, or until
   // ReleaseSocket is called for the socket.  Returns an id for the socket.
   int RegisterSocket(scoped_refptr<device::BluetoothSocket> socket);
 
   // Release the BluetoothSocket corresponding to |id|.  Returns true if
   // the socket was found and released, false otherwise.
   bool ReleaseSocket(int id);
 
@@ skipping 20 matching lines @@
                                      bool has_power) OVERRIDE;
   virtual void AdapterDiscoveringChanged(device::BluetoothAdapter* adapter,
                                          bool discovering) OVERRIDE;
   virtual void DeviceAdded(device::BluetoothAdapter* adapter,
                            device::BluetoothDevice* device) OVERRIDE;
 
   // Exposed for testing.
   void SetAdapterForTest(device::BluetoothAdapter* adapter) {
     adapter_ = adapter;
   }
+
  private:
+  static bool IsBluetoothEvent(const std::string& event_name);
+
+  bool IsAdapterNeeded() const;
+
+  void InitializeAdapterIfNeeded();
+  void MaybeReleaseAdapter();
+
   void DispatchBooleanValueEvent(const char* event_name, bool value);
 
   bool send_discovery_events_;
   bool responsible_for_discovery_;
 
   Profile* profile_;
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
+  int num_event_listeners_;
+
   // The next id to use for referring to a BluetoothSocket.  We avoid using
   // the fd of the socket because we don't want to leak that information to
   // the extension javascript.
   int next_socket_id_;
 
   typedef std::map<int, scoped_refptr<device::BluetoothSocket> > SocketMap;
   SocketMap socket_map_;
 
   typedef ScopedVector<extensions::api::bluetooth::Device>
       DeviceList;
   DeviceList discovered_devices_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionBluetoothEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_BLUETOOTH_EVENT_ROUTER_H_