Refactor DBusThreadManager to split away BT clients.

device/bluetooth/dbus/bluez_dbus_manager.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 DEVICE_BLUETOOTH_DBUS_BLUEZ_DBUS_MANAGER_H_
+#define DEVICE_BLUETOOTH_DBUS_BLUEZ_DBUS_MANAGER_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "device/bluetooth/bluetooth_export.h"
+#include "device/bluetooth/dbus/bluetooth_dbus_client_bundle.h"
+
+namespace base {
+class Thread;
+}  // namespace base
+
+namespace dbus {
+class Bus;
+class ObjectPath;
+}  // namespace dbus
+
+namespace bluez {
+
+// Style Note: Clients are sorted by names.
+class BluetoothAdapterClient;
+class BluetoothAgentManagerClient;
+class BluetoothDeviceClient;
+class BluetoothGattCharacteristicClient;
+class BluetoothGattDescriptorClient;
+class BluetoothGattManagerClient;
+class BluetoothGattServiceClient;
+class BluetoothInputClient;
+class BluetoothLEAdvertisingManagerClient;
+class BluetoothMediaClient;
+class BluetoothMediaTransportClient;
+class BluetoothProfileManagerClient;
+class BluezDBusManagerSetter;
+
+// BluezDBusManager manages manages D-Bus connections and D-Bus clients, which
+// depend on the D-Bus thread to ensure the right order of shutdowns for
+// the D-Bus thread, the D-Bus connections, and the D-Bus clients.
+//
+// CALLBACKS IN D-BUS CLIENTS:
+//
+// D-Bus clients managed by BluezDBusManagerSetter are guaranteed to be deleted
+// after the D-Bus thread so the clients don't need to worry if new
+// incoming messages arrive from the D-Bus thread during shutdown of the
+// clients. The UI message loop is not running during the shutdown hence
+// the UI message loop won't post tasks to D-BUS clients during the
+// shutdown. However, to be extra cautious, clients should use
+// WeakPtrFactory when creating callbacks that run on UI thread. See
+// session_manager_client.cc for examples.
+//
+class DEVICE_BLUETOOTH_EXPORT BluezDBusManager {
+ public:
+  // Sets the global instance. Must be called before any calls to Get().
+  // We explicitly initialize and shut down the global object, rather than
+  // making it a Singleton, to ensure clean startup and shutdown.
+  // This will initialize real or stub DBusClients depending on command-line
+  // arguments and whether this process runs in a ChromeOS environment.
+  static void Initialize(dbus::Bus* bus, bool use_dbus_stub);
+
+  // Returns a BluezDBusManagerSetter instance that allows tests to
+  // replace individual D-Bus clients with their own implementations.
+  // Also initializes the main BluezDBusManager for testing if necessary.
+  static scoped_ptr<BluezDBusManagerSetter> GetSetterForTesting();
+
+  // Returns true if BluezDBusManager has been initialized. Call this to
+  // avoid initializing + shutting down BluezDBusManager more than once.
+  static bool IsInitialized();
+
+  // Destroys the global instance.
+  static void Shutdown();
+
+  // Gets the global instance. Initialize() must be called first.
+  static BluezDBusManager* Get();
+
+  // Returns true if |client| is stubbed.
+  bool IsUsingStub() { return client_bundle_->IsUsingStub(); }
+
+  // Returns various D-Bus bus instances, owned by BluezDBusManager.
+  dbus::Bus* GetSystemBus();
+
+  // All returned objects are owned by BluezDBusManager.  Do not use these
+  // pointers after BluezDBusManager has been shut down.
+  BluetoothAdapterClient* GetBluetoothAdapterClient();
+  BluetoothLEAdvertisingManagerClient* GetBluetoothLEAdvertisingManagerClient();
+  BluetoothAgentManagerClient* GetBluetoothAgentManagerClient();
+  BluetoothDeviceClient* GetBluetoothDeviceClient();
+  BluetoothGattCharacteristicClient* GetBluetoothGattCharacteristicClient();
+  BluetoothGattDescriptorClient* GetBluetoothGattDescriptorClient();
+  BluetoothGattManagerClient* GetBluetoothGattManagerClient();
+  BluetoothGattServiceClient* GetBluetoothGattServiceClient();
+  BluetoothInputClient* GetBluetoothInputClient();
+  BluetoothMediaClient* GetBluetoothMediaClient();
+  BluetoothMediaTransportClient* GetBluetoothMediaTransportClient();
+  BluetoothProfileManagerClient* GetBluetoothProfileManagerClient();
+
+ private:
+  friend class BluezDBusManagerSetter;
+
+  // Creates a new BluezDBusManager using the DBusClients set in
+  // |client_bundle|.
+  explicit BluezDBusManager(
+      dbus::Bus* bus,
+      scoped_ptr<BluetoothDBusClientBundle> client_bundle);
+  ~BluezDBusManager();
+
+  // Creates a global instance of BluezDBusManager. Cannot be called more than
+  // once.
+  static void CreateGlobalInstance(dbus::Bus* bus, bool use_stubs);
+
+  // Initializes all currently stored DBusClients with the system bus and
+  // performs additional setup.
+  void InitializeClients();
+
+  dbus::Bus* bus_;
+  scoped_ptr<BluetoothDBusClientBundle> client_bundle_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluezDBusManager);
+};
+
+class DEVICE_BLUETOOTH_EXPORT BluezDBusManagerSetter {
+ public:
+  ~BluezDBusManagerSetter();
+
+  void SetBluetoothAdapterClient(scoped_ptr<BluetoothAdapterClient> client);
+  void SetBluetoothLEAdvertisingManagerClient(
+      scoped_ptr<BluetoothLEAdvertisingManagerClient> client);
+  void SetBluetoothAgentManagerClient(
+      scoped_ptr<BluetoothAgentManagerClient> client);
+  void SetBluetoothDeviceClient(scoped_ptr<BluetoothDeviceClient> client);
+  void SetBluetoothGattCharacteristicClient(
+      scoped_ptr<BluetoothGattCharacteristicClient> client);
+  void SetBluetoothGattDescriptorClient(
+      scoped_ptr<BluetoothGattDescriptorClient> client);
+  void SetBluetoothGattManagerClient(
+      scoped_ptr<BluetoothGattManagerClient> client);
+  void SetBluetoothGattServiceClient(
+      scoped_ptr<BluetoothGattServiceClient> client);
+  void SetBluetoothInputClient(scoped_ptr<BluetoothInputClient> client);
+  void SetBluetoothMediaClient(scoped_ptr<BluetoothMediaClient> client);
+  void SetBluetoothMediaTransportClient(
+      scoped_ptr<BluetoothMediaTransportClient> client);
+  void SetBluetoothProfileManagerClient(
+      scoped_ptr<BluetoothProfileManagerClient> client);
+
+ private:
+  friend class BluezDBusManager;
+
+  BluezDBusManagerSetter();
+
+  DISALLOW_COPY_AND_ASSIGN(BluezDBusManagerSetter);
+};
+
+}  // namespace bluez
+
+#endif  // DEVICE_BLUETOOTH_DBUS_BLUEZ_DBUS_MANAGER_H_