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/**
* @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> >
{
LLSINGLETON(LLFunctorRegistry);
LOG_CLASS(LLFunctorRegistry);
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;
if (mMap.count(name) == 0)
{
mMap[name] = f;
}
else
{
LL_ERRS() << "attempt to store duplicate name '" << name << "' in LLFunctorRegistry. NOT ADDED." << LL_ENDL;
retval = false;
}
return retval;
}
bool unregisterFunctor(const std::string& name)
{
if (mMap.count(name) == 0)
{
LL_WARNS() << "trying to remove '" << name << "' from LLFunctorRegistry but it's not there." << LL_ENDL;
return false;
}
mMap.erase(name);
return true;
}
FUNCTOR_TYPE getFunctor(const std::string& name)
{
if (mMap.count(name) != 0)
{
return mMap[name];
}
else
{
LL_DEBUGS() << "tried to find '" << name << "' in LLFunctorRegistry, but it wasn't there." << LL_ENDL;
return mMap[LOGFUNCTOR];
}
}
const std::string LOGFUNCTOR;
const std::string DONOTHING;
private:
static void log_functor(const LLSD& notification, const LLSD& payload)
{
LL_DEBUGS() << "log_functor called with payload: " << payload << LL_ENDL;
}
static void do_nothing(const LLSD& notification, const LLSD& payload)
{
// what the sign sez
}
FunctorMap mMap;
};
template <typename FUNCTOR_TYPE>
LLFunctorRegistry<FUNCTOR_TYPE>::LLFunctorRegistry() :
LOGFUNCTOR("LogFunctor"), DONOTHING("DoNothing")
{
mMap[LOGFUNCTOR] = log_functor;
mMap[DONOTHING] = do_nothing;
}
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
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