/** * @file llfunctorregistry.h * @author Kent Quirk * @brief Maintains a registry of named callback functors taking a single LLSD parameter * * $LicenseInfo:firstyear=2008&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #ifndef LL_LLFUNCTORREGISTRY_H #define LL_LLFUNCTORREGISTRY_H #include <string> #include <map> #include <boost/function.hpp> #include "llsd.h" #include "llsingleton.h" /** * @class LLFunctorRegistry * @brief Maintains a collection of named functors for remote binding * (mainly for use in callbacks from notifications and other signals) * @see LLNotifications * * This class maintains a collection of named functors in a singleton. * We wanted to be able to persist notifications with their callbacks * across restarts of the viewer; we couldn't store functors that way. * Using this registry, systems that require a functor to be maintained * long term can register it at system startup, and then pass in the * functor by name. */ template <typename FUNCTOR_TYPE> class LLFunctorRegistry : public LLSingleton<LLFunctorRegistry<FUNCTOR_TYPE> > { friend class LLSingleton<LLFunctorRegistry>; LOG_CLASS(LLFunctorRegistry); private: LLFunctorRegistry() : LOGFUNCTOR("LogFunctor"), DONOTHING("DoNothing") { mMap[LOGFUNCTOR] = log_functor; mMap[DONOTHING] = do_nothing; } public: typedef FUNCTOR_TYPE ResponseFunctor; typedef typename std::map<std::string, FUNCTOR_TYPE> FunctorMap; bool registerFunctor(const std::string& name, ResponseFunctor f) { bool retval = true; typename FunctorMap::iterator it = mMap.find(name); if (mMap.count(name) == 0) { mMap[name] = f; } else { llerrs << "attempt to store duplicate name '" << name << "' in LLFunctorRegistry. NOT ADDED." << llendl; retval = false; } return retval; } bool unregisterFunctor(const std::string& name) { if (mMap.count(name) == 0) { llwarns << "trying to remove '" << name << "' from LLFunctorRegistry but it's not there." << llendl; return false; } mMap.erase(name); return true; } FUNCTOR_TYPE getFunctor(const std::string& name) { typename FunctorMap::iterator it = mMap.find(name); if (mMap.count(name) != 0) { return mMap[name]; } else { lldebugs << "tried to find '" << name << "' in LLFunctorRegistry, but it wasn't there." << llendl; return mMap[LOGFUNCTOR]; } } const std::string LOGFUNCTOR; const std::string DONOTHING; private: static void log_functor(const LLSD& notification, const LLSD& payload) { lldebugs << "log_functor called with payload: " << payload << llendl; } static void do_nothing(const LLSD& notification, const LLSD& payload) { // what the sign sez } FunctorMap mMap; }; template <typename FUNCTOR_TYPE> class LLFunctorRegistration { public: LLFunctorRegistration(const std::string& name, FUNCTOR_TYPE functor) { LLFunctorRegistry<FUNCTOR_TYPE>::instance().registerFunctor(name, functor); } }; #endif//LL_LLFUNCTORREGISTRY_H