src/factory_filter.cpp

   1 /* $Id: factory_filter.cpp,v 1.3 2006-01-19 09:41:01 adam Exp $
   2    Copyright (c) 2005, Index Data.
   3
   4 %LICENSE%
   5  */
   6
   7 #include "config.hpp"
   8
   9 #include "factory_filter.hpp"
  10
  11 #if HAVE_DLFCN_H
  12 #include <dlfcn.h>
  13 #endif
  14 #include <stdexcept>
  15 #include <iostream>
  16 #include <string>
  17 #include <map>
  18
  19 namespace yp2 {
  20     class FactoryFilter::Rep {
  21         typedef std::map<std::string, CreateFilterCallback> CallbackMap;
  22         typedef std::map<std::string, CreateFilterCallback>::iterator
  23             CallbackMapIt;
  24     public:
  25         friend class FactoryFilter;
  26         CallbackMap m_fcm;
  27         Rep();
  28         ~Rep();
  29     };
  30 }
  31
  32 yp2::FactoryFilter::NotFound::NotFound(const std::string message)
  33     : std::runtime_error(message)
  34 {
  35 }
  36
  37 yp2::FactoryFilter::Rep::Rep()
  38 {
  39 }
  40
  41 yp2::FactoryFilter::Rep::~Rep()
  42 {
  43 }
  44
  45 yp2::FactoryFilter::FactoryFilter() : m_p(new yp2::FactoryFilter::Rep)
  46 {
  47
  48 }
  49
  50 yp2::FactoryFilter::~FactoryFilter()
  51 {
  52
  53 }
  54
  55 bool yp2::FactoryFilter::add_creator(std::string fi,
  56                                      CreateFilterCallback cfc)
  57 {
  58     return m_p->m_fcm.insert(Rep::CallbackMap::value_type(fi, cfc)).second;
  59 }
  60
  61
  62 bool yp2::FactoryFilter::drop_creator(std::string fi)
  63 {
  64     return m_p->m_fcm.erase(fi) == 1;
  65 }
  66
  67 bool yp2::FactoryFilter::exist(std::string fi)
  68 {
  69     Rep::CallbackMap::const_iterator it = m_p->m_fcm.find(fi);
  70
  71     if (it == m_p->m_fcm.end())
  72     {
  73         return false;
  74     }
  75     return true;
  76 }
  77
  78 yp2::filter::Base* yp2::FactoryFilter::create(std::string fi)
  79 {
  80     Rep::CallbackMap::const_iterator it = m_p->m_fcm.find(fi);
  81
  82     if (it == m_p->m_fcm.end()){
  83         std::string msg = "filter type '" + fi + "' not found";
  84             throw NotFound(msg);
  85     }
  86     // call create function
  87     return (it->second());
  88 }
  89
  90 bool yp2::FactoryFilter::have_dl_support()
  91 {
  92 #if HAVE_DLFCN_H
  93     return true;
  94 #else
  95     return false;
  96 #endif
  97 }
  98
  99 bool yp2::FactoryFilter::add_creator_dl(const std::string &fi,
 100                                         const std::string &path)
 101 {
 102 #if HAVE_DLFCN_H
 103     if (m_p->m_fcm.find(fi) != m_p->m_fcm.end())
 104     {
 105         return true;
 106     }
 107
 108     std::string full_path = path + "/yp2_filter_" + fi + ".so";
 109     void *dl_handle = dlopen(full_path.c_str(), RTLD_GLOBAL|RTLD_NOW);
 110     if (!dl_handle)
 111     {
 112         const char *dl = dlerror();
 113         std::cout << "dlopen " << full_path << " failed. dlerror=" << dl <<
 114             std::endl;
 115         return false;
 116     }
 117
 118     std::string full_name = "yp2_filter_" + fi;
 119
 120     void *dlsym_ptr = dlsym(dl_handle, full_name.c_str());
 121     if (!dlsym_ptr)
 122     {
 123         std::cout << "dlsym " << full_name << " failed\n";
 124         return false;
 125     }
 126     struct yp2_filter_struct *s = (struct yp2_filter_struct *) dlsym_ptr;
 127     return add_creator(fi, s->creator);
 128 #else
 129     return false;
 130 #endif
 131 }
 132
 133 /*
 134  * Local variables:
 135  * c-basic-offset: 4
 136  * indent-tabs-mode: nil
 137  * c-file-style: "stroustrup"
 138  * End:
 139  * vim: shiftwidth=4 tabstop=8 expandtab
 140  */