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PluginLoader.h

00001 /*****************************************************************************
00002  * Author:   Valient Gough <vgough@pobox.com>
00003  *
00004  *****************************************************************************
00005  * Copyright (c) 2001, Valient Gough
00006  *
00007  * This library is free software; you can distribute it and/or modify it under
00008  * the terms of the GNU Lesser General Public License (LGPL), as published by
00009  * the Free Software Foundation; either version 2.1 of the License, or (at your
00010  * option) any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful, but WITHOUT
00013  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00014  * FITNESS FOR A PARTICULAR PURPOSE.  See the LGPL in the file COPYING for more
00015  * details.
00016  *
00017  */
00018 
00019 #ifndef _PluginLoader_incl_
00020 #define _PluginLoader_incl_
00021 
00022 #include <rel/SmartPtr.h>
00023 
00024 #include <string>
00025 
00026 namespace rel
00027 {
00028 
00029     class PluginLoader
00030     {
00031     public:
00032         PluginLoader(const std::string &fileName);
00033         ~PluginLoader();
00034 
00035         typedef OpaqueValue (*func_t)(const OpaqueValue *);
00036 
00037         func_t lookupFunction(const char *funcName);
00038 
00039     private:
00040         bool loadPlugin();
00041 
00042         struct PluginLoaderImpl *impl;
00043     };
00044 
00045     class PluginEntryPoint
00046     {
00047     public:
00048         PluginEntryPoint(const std::string &entryPointName, 
00049                 const SmartPtr<PluginLoader> &plugin);
00050         ~PluginEntryPoint();
00051 
00052         bool execute(const OpaqueValue *args, OpaqueValue *output);
00053 
00054     private:
00055         struct PluginEntryPointImpl *impl;
00056     };
00057 
00058 
00059     // Redefine how smart pointer interpret is implemented.  This makes it so
00060     // that a PluginEntryPoint may be inserted into a map to transparently act
00061     // as a conduit for that plugin call.
00062     template<>
00063         bool smartPtrInterpret<PluginEntryPoint>(PluginEntryPoint *value,
00064                 const std::type_info &outputType,
00065                 const OpaqueValue *args,
00066                 OpaqueValue *output);
00067 
00068 
00069 } // namespace rel
00070 
00071 #endif
00072 

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