| // Copyright 2015 The Chromium OS 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 LIBBRILLO_BRILLO_DBUS_DBUS_SERVICE_WATCHER_H_ |
| #define LIBBRILLO_BRILLO_DBUS_DBUS_SERVICE_WATCHER_H_ |
| |
| #include <string> |
| |
| #include <base/callback.h> |
| #include <base/macros.h> |
| #include <base/memory/ref_counted.h> |
| #include <base/memory/weak_ptr.h> |
| #include <brillo/brillo_export.h> |
| #include <dbus/bus.h> |
| |
| namespace brillo { |
| namespace dbus_utils { |
| |
| // DBusServiceWatcher just asks the bus to notify us when the owner of a remote |
| // DBus connection transitions to the empty string. After registering a |
| // callback to be notified of name owner transitions, for the given |
| // |connection_name|, DBusServiceWatcher asks for the current owner. If at any |
| // point an empty string is found for the connection name owner, |
| // DBusServiceWatcher will call back to notify of the connection vanishing. |
| // |
| // The chief value of this class is that it manages the lifetime of the |
| // registered callback in the Bus, because failure to remove callbacks will |
| // cause the Bus to crash the process on destruction. |
| class BRILLO_EXPORT DBusServiceWatcher { |
| public: |
| DBusServiceWatcher(scoped_refptr<::dbus::Bus> bus, |
| const std::string& connection_name, |
| const base::Closure& on_connection_vanish); |
| virtual ~DBusServiceWatcher(); |
| virtual std::string connection_name() const { return connection_name_; } |
| |
| private: |
| void OnServiceOwnerChange(const std::string& service_owner); |
| |
| scoped_refptr<::dbus::Bus> bus_; |
| const std::string connection_name_; |
| ::dbus::Bus::GetServiceOwnerCallback monitoring_callback_; |
| base::Closure on_connection_vanish_; |
| |
| base::WeakPtrFactory<DBusServiceWatcher> weak_factory_{this}; |
| DISALLOW_COPY_AND_ASSIGN(DBusServiceWatcher); |
| }; |
| |
| } // namespace dbus_utils |
| } // namespace brillo |
| |
| #endif // LIBBRILLO_BRILLO_DBUS_DBUS_SERVICE_WATCHER_H_ |