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// 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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_WRAPPER_H_
#define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_WRAPPER_H_
#include <unordered_set>
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "device/bluetooth/bluetooth_adapter.h"
#include "device/bluetooth/bluetooth_export.h"
namespace device {
// 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 DEVICE_BLUETOOTH_EXPORT BluetoothAdapterFactoryWrapper {
public:
typedef base::Callback<void(BluetoothAdapter*)> AcquireAdapterCallback;
~BluetoothAdapterFactoryWrapper();
static BluetoothAdapterFactoryWrapper& Get();
// 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(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(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.
BluetoothAdapter* GetAdapter(BluetoothAdapter::Observer* observer);
// 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<BluetoothAdapter> mock_adapter);
private:
// friend LazyInstance to permit access to private constructor.
friend base::DefaultLazyInstanceTraits<BluetoothAdapterFactoryWrapper>;
BluetoothAdapterFactoryWrapper();
void OnGetAdapter(const AcquireAdapterCallback& continuation,
scoped_refptr<BluetoothAdapter> adapter);
bool HasAdapter(BluetoothAdapter::Observer* observer);
void AddAdapterObserver(BluetoothAdapter::Observer* observer);
void RemoveAdapterObserver(BluetoothAdapter::Observer* observer);
// Sets |adapter_| to a BluetoothAdapter instance and register observers,
// releasing references to previous |adapter_|.
void set_adapter(scoped_refptr<BluetoothAdapter> adapter);
// A BluetoothAdapter instance representing an adapter of the system.
scoped_refptr<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<BluetoothAdapter::Observer*> adapter_observers_;
// Should only be called on the UI thread.
base::ThreadChecker thread_checker_;
// 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 device
#endif // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_WRAPPER_H_