bluetooth: Move requestDevice to mojo

content/browser/bluetooth/bluetooth_adapter_factory_wrapper.h

+// Copyright 2016 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 CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_WRAPPER_H_
+#define CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_WRAPPER_H_
+
+#include <unordered_set>
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "content/common/content_export.h"
+#include "device/bluetooth/bluetooth_adapter.h"
+
+namespace content {
+
+class WebBluetoothServiceImpl;
+
+// Wrapper around BluetoothAdapterFactory that allows us to change
+// the underlying BluetoothAdapter object and have the observers
+// observe the new instance of the object.
+// TODO(ortuno): Once there is no need to swap the adapter to change its
+// behavior observers should add/remove themselves to/from the adapter.
+// http://crbug.com/603291
+class CONTENT_EXPORT BluetoothAdapterFactoryWrapper final {
+ public:
+  typedef base::Callback<void(device::BluetoothAdapter*)>
+      AcquireAdapterCallback;
+
+  BluetoothAdapterFactoryWrapper();
+  ~BluetoothAdapterFactoryWrapper();
+
+  // Returns true if the platform supports Bluetooth or if
+  // SetBluetoothAdapterForTesting has been called.
+  bool IsBluetoothAdapterAvailable();
+
+  // Adds |observer| to the set of adapter observers. If another observer has
+  // acquired the adapter in the past it adds |observer| as an observer to that
+  // adapter, otherwise it gets a new adapter and adds |observer| to it. Runs
+  // |callback| with the adapter |observer| has been added to.
+  void AcquireAdapter(device::BluetoothAdapter::Observer* observer,
+                      const AcquireAdapterCallback& callback);
+  // Removes |observer| from the list of adapter observers if |observer|
+  // has acquired the adapter in the past. If there are no more observers
+  // it deletes the reference to the adapter.
+  void ReleaseAdapter(device::BluetoothAdapter::Observer* observer);
+
+  // Returns an adapter if |observer| has acquired an adapter in the past and
+  // this instance holds a reference to an adapter. Otherwise returns nullptr.
+  device::BluetoothAdapter* GetAdapter(
+      device::BluetoothAdapter::Observer* observer);
+
+  // The period of time a device discovery session should be active for.
+  // Returns 0 if SetBluetoothAdapterForTesting has been called.
+  base::TimeDelta GetScanDuration() { return scan_duration_; }
+
+  // Sets a new BluetoothAdapter to be returned by GetAdapter. When setting
+  // a new adapter all observers from the old adapter are removed and added
+  // to |mock_adapter|.
+  void SetBluetoothAdapterForTesting(
+      scoped_refptr<device::BluetoothAdapter> mock_adapter);
+
+ private:
+  void OnGetAdapter(const AcquireAdapterCallback& continuation,
+                    scoped_refptr<device::BluetoothAdapter> adapter);
+
+  bool HasAdapter(device::BluetoothAdapter::Observer* observer);
+  void AddAdapterObserver(device::BluetoothAdapter::Observer* observer);
+  void RemoveAdapterObserver(device::BluetoothAdapter::Observer* observer);
+
+  // Sets |adapter_| to a BluetoothAdapter instance and register observers,
+  // releasing references to previous |adapter_|.
+  void set_adapter(scoped_refptr<device::BluetoothAdapter> adapter);
+
+  // A BluetoothAdapter instance representing an adapter of the system.
+  scoped_refptr<device::BluetoothAdapter> adapter_;
+
+  // We keep a list of all observers so that when the adapter gets swapped,
+  // we can remove all observers from the old adapter and add them to the
+  // new adapter.
+  std::unordered_set<device::BluetoothAdapter::Observer*> adapter_observers_;
+
+  // This is 0 if SetBluetoothAdapterForTesting has been called.
+  base::TimeDelta scan_duration_;
+
+  bool testing_;
+
+  // Weak pointer factory for generating 'this' pointers that might live longer
+  // than we do.
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate its weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<BluetoothAdapterFactoryWrapper> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterFactoryWrapper);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_WRAPPER_H_