forked from Kistler-Group/sdbus-cpp
84a6fbbf86
Moving adaptor or proxy instances changes their `this` pointer. But `this` is captured by value in closures used by those instances, and this remains unchanged on move, leading to accessing an invalid instance when a lambda expression executes. Supporting move semantics would require unsubscribing/unregistering vtable, handlers, etc. and re-subscribing and re-registering all that, which is too complicated and may have side effects. Hence it has been decided that these classes are not moveable. One may use an indirection with e.g. `std::unique_ptr` to get move semantics.
218 lines
8.4 KiB
C++
218 lines
8.4 KiB
C++
/**
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* (C) 2016 - 2021 KISTLER INSTRUMENTE AG, Winterthur, Switzerland
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* (C) 2016 - 2024 Stanislav Angelovic <stanislav.angelovic@protonmail.com>
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*
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* @file ProxyInterfaces.h
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*
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* Created on: Apr 8, 2019
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* Project: sdbus-c++
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* Description: High-level D-Bus IPC C++ library based on sd-bus
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*
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* This file is part of sdbus-c++.
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*
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* sdbus-c++ is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* sdbus-c++ is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with sdbus-c++. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SDBUS_CXX_PROXYINTERFACES_H_
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#define SDBUS_CXX_PROXYINTERFACES_H_
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#include <sdbus-c++/IProxy.h>
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#include <cassert>
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#include <string>
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#include <memory>
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// Forward declarations
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namespace sdbus {
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class IConnection;
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}
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namespace sdbus {
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/********************************************//**
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* @class ProxyObjectHolder
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*
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* ProxyObjectHolder is a helper that simply owns and provides
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* access to a proxy object to other classes in the inheritance
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* hierarchy of a native-like proxy object based on generated
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* interface classes.
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*
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***********************************************/
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class ProxyObjectHolder
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{
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protected:
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ProxyObjectHolder(std::unique_ptr<IProxy>&& proxy)
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: proxy_(std::move(proxy))
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{
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assert(proxy_ != nullptr);
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}
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const IProxy& getProxy() const
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{
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assert(proxy_ != nullptr);
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return *proxy_;
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}
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IProxy& getProxy()
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{
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assert(proxy_ != nullptr);
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return *proxy_;
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}
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private:
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std::unique_ptr<IProxy> proxy_;
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};
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/********************************************//**
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* @class ProxyInterfaces
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*
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* ProxyInterfaces is a helper template class that joins all interface classes of a remote
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* D-Bus object generated by sdbus-c++-xml2cpp to be used on the client (the proxy) side,
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* including some auxiliary classes. ProxyInterfaces is the class that native-like proxy
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* implementation classes written by users should inherit from and implement all pure virtual
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* methods. So the _Interfaces template parameter is a list of sdbus-c++-xml2cpp-generated
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* proxy-side interface classes representing interfaces of the corresponding remote D-Bus object.
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*
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* In the final adaptor class inherited from ProxyInterfaces, one needs to make sure:
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* 1. to call `registerProxy();` in the class constructor, and, conversely,
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* 2. to call `unregisterProxy();` in the class destructor,
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* so that the signals are subscribed to and unsubscribed from at a proper time.
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*
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***********************************************/
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template <typename... _Interfaces>
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class ProxyInterfaces
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: protected ProxyObjectHolder
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, public _Interfaces...
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{
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public:
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/*!
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* @brief Creates native-like proxy object instance
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*
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* @param[in] destination Bus name that provides a D-Bus object
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* @param[in] objectPath Path of the D-Bus object
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*
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* This constructor overload creates a proxy that manages its own D-Bus connection(s).
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* For more information on its behavior, consult @ref createProxy(std::string,std::string)
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*/
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ProxyInterfaces(ServiceName destination, ObjectPath objectPath)
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: ProxyObjectHolder(createProxy(std::move(destination), std::move(objectPath)))
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, _Interfaces(getProxy())...
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{
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}
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/*!
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* @brief Creates native-like proxy object instance
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*
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* @param[in] destination Bus name that provides a D-Bus object
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* @param[in] objectPath Path of the D-Bus object
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*
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* This constructor overload creates a proxy that manages its own D-Bus connection(s).
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* For more information on its behavior, consult @ref createProxy(std::string,std::string,sdbus::dont_run_event_loop_thread_t)
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*/
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ProxyInterfaces(ServiceName destination, ObjectPath objectPath, dont_run_event_loop_thread_t)
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: ProxyObjectHolder(createProxy(std::move(destination), std::move(objectPath), dont_run_event_loop_thread))
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, _Interfaces(getProxy())...
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{
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}
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/*!
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* @brief Creates native-like proxy object instance
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*
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* @param[in] connection D-Bus connection to be used by the proxy object
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* @param[in] destination Bus name that provides a D-Bus object
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* @param[in] objectPath Path of the D-Bus object
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*
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* The proxy created this way just references a D-Bus connection owned and managed by the user.
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* For more information on its behavior, consult @ref createProxy(IConnection&,std::string,std::string)
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*/
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ProxyInterfaces(IConnection& connection, ServiceName destination, ObjectPath objectPath)
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: ProxyObjectHolder(createProxy(connection, std::move(destination), std::move(objectPath)))
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, _Interfaces(getProxy())...
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{
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}
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/*!
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* @brief Creates native-like proxy object instance
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*
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* @param[in] connection D-Bus connection to be used by the proxy object
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* @param[in] destination Bus name that provides a D-Bus object
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* @param[in] objectPath Path of the D-Bus object
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*
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* The proxy created this way becomes an owner of the connection.
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* For more information on its behavior, consult @ref createProxy(std::unique_ptr<sdbus::IConnection>&&,std::string,std::string)
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*/
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ProxyInterfaces(std::unique_ptr<sdbus::IConnection>&& connection, ServiceName destination, ObjectPath objectPath)
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: ProxyObjectHolder(createProxy(std::move(connection), std::move(destination), std::move(objectPath)))
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, _Interfaces(getProxy())...
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{
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}
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/*!
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* @brief Creates native-like proxy object instance
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*
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* @param[in] connection D-Bus connection to be used by the proxy object
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* @param[in] destination Bus name that provides a D-Bus object
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* @param[in] objectPath Path of the D-Bus object
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*
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* The proxy created this way becomes an owner of the connection.
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* For more information on its behavior, consult @ref createProxy(std::unique_ptr<sdbus::IConnection>&&,std::string,std::string,sdbus::dont_run_event_loop_thread_t)
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*/
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ProxyInterfaces(std::unique_ptr<sdbus::IConnection>&& connection, ServiceName destination, ObjectPath objectPath, dont_run_event_loop_thread_t)
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: ProxyObjectHolder(createProxy(std::move(connection), std::move(destination), std::move(objectPath), dont_run_event_loop_thread))
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, _Interfaces(getProxy())...
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{
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}
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/*!
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* @brief Registers handlers for D-Bus signals of the remote object
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*
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* This function must be called in the constructor of the final proxy class that implements ProxyInterfaces.
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*
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* See also @ref IProxy::registerSignalHandler()
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*/
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void registerProxy()
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{
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(_Interfaces::registerProxy(), ...);
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}
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/*!
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* @brief Unregisters the proxy so it no more receives signals and async call replies
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*
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* This function must be called in the destructor of the final proxy class that implements ProxyInterfaces.
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*
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* See underlying @ref IProxy::unregister()
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*/
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void unregisterProxy()
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{
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getProxy().unregister();
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}
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/*!
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* @brief Returns reference to the underlying IProxy instance
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*/
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using ProxyObjectHolder::getProxy;
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protected:
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using base_type = ProxyInterfaces;
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ProxyInterfaces(const ProxyInterfaces&) = delete;
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ProxyInterfaces& operator=(const ProxyInterfaces&) = delete;
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ProxyInterfaces(ProxyInterfaces&&) = delete;
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ProxyInterfaces& operator=(ProxyInterfaces&&) = delete;
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~ProxyInterfaces() = default;
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};
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}
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#endif /* SDBUS_CXX_INTERFACES_H_ */
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