1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef CHROMEOS_DBUS_BLOCKING_METHOD_CALLER_H_ 6#define CHROMEOS_DBUS_BLOCKING_METHOD_CALLER_H_ 7 8#include "base/callback.h" 9#include "base/synchronization/waitable_event.h" 10#include "chromeos/chromeos_export.h" 11#include "dbus/message.h" 12 13namespace dbus { 14 15class Bus; 16class ObjectProxy; 17 18} // namespace dbus 19 20namespace chromeos { 21 22// A utility class to call D-Bus methods in a synchronous (blocking) way. 23// Note: Blocking the thread until it returns is not a good idea in most cases. 24// Avoid using this class as hard as you can. 25class CHROMEOS_EXPORT BlockingMethodCaller { 26 public: 27 BlockingMethodCaller(dbus::Bus* bus, dbus::ObjectProxy* proxy); 28 virtual ~BlockingMethodCaller(); 29 30 // Calls the method and blocks until it returns. 31 scoped_ptr<dbus::Response> CallMethodAndBlock(dbus::MethodCall* method_call); 32 33 private: 34 dbus::Bus* bus_; 35 dbus::ObjectProxy* proxy_; 36 base::WaitableEvent on_blocking_method_call_; 37 38 DISALLOW_COPY_AND_ASSIGN(BlockingMethodCaller); 39}; 40 41} // namespace chromeos 42 43#endif // CHROMEOS_DBUS_BLOCKING_METHOD_CALLER_H_ 44