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/**
* @file llfunctorregistry.h
* @author Kent Quirk
* @brief Maintains a registry of named callback functors taking a single LLSD parameter
*
* $LicenseInfo:firstyear=2008&license=viewergpl$
*
* Copyright (c) 2008-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#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
{
llwarns << "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)
{
llwarns << "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
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