device/bluetooth: Clean up classic discovery in BluetoothAdapterMac.

device/bluetooth/bluetooth_discovery_manager_mac.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 DEVICE_BLUETOOTH_BLUETOOTH_DISCOVERY_MANAGER_MAC_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_DISCOVERY_MANAGER_MAC_H_
+
+#include "base/macros.h"
+
+@class IOBluetoothDevice;
+
+namespace device {
+
+// Class used by BluetoothAdapterMac to manage classic and LE device discovery.
+// For Bluetooth Classic, this class is responsible for keeping device inquiry
+// running if device discovery is initiated.
+class BluetoothDiscoveryManagerMac {
+ public:
+  // Interface for being notified of events during a device discovery session.
+  class Observer {
+   public:
+    // Called when |manager| has found a device through classic device inquiry
+    // in the form of a IOBluetoothDevice.
+    virtual void DeviceFound(BluetoothDiscoveryManagerMac* manager,
+                             IOBluetoothDevice* device) {}
+
+    // Called when device discovery is no longer running, due to either a call
+    // to BluetoothDiscoveryManagerMac::StopDiscovery or an unexpected reason,
+    // such as when a user disables the controller, in which case the value of
+    // |unexpected| will be true.
+    virtual void DiscoveryStopped(BluetoothDiscoveryManagerMac* manager,
+                                  bool unexpected) {}
+  };
+
+  virtual ~BluetoothDiscoveryManagerMac();
+
+  // Returns true, if discovery is currently being performed.
+  virtual bool IsDiscovering() const = 0;
+
+  // Initiates a discovery session. Returns true on success or if discovery
+  // is already running. Returns false on failure.
+  virtual bool StartDiscovery() = 0;
+
+  // Stops a discovery session. Returns true on success or if discovery is
+  // already not running. Returns false on failure.
+  virtual bool StopDiscovery() = 0;
+
+  // Creates a discovery manager for Bluetooth Classic device discovery with
+  // observer |observer|. Note that the life-time of |observer| should not
+  // end before that of the returned BluetoothDiscoveryManager, as that may
+  // lead to use after free errors.
+  static BluetoothDiscoveryManagerMac* CreateClassic(Observer* observer);
+
+ protected:
+  explicit BluetoothDiscoveryManagerMac(Observer* observer);
+
+  // Observer interested in notifications from us.
+  Observer* observer_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BluetoothDiscoveryManagerMac);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_DISCOVERY_MANAGER_MAC_H_