C++ (Cpp) create_static_datasource Examples

Example #1

File: datasource_cache.cpp Project: albertov/mapnik

datasource_ptr datasource_cache::create(parameters const& params)
{
    boost::optional<std::string> type = params.get<std::string>("type");
    if (!type)
    {
        throw config_error(std::string("Could not create datasource. Required ") +
                           "parameter 'type' is missing");
    }

    datasource_ptr ds;

#ifdef MAPNIK_STATIC_PLUGINS
    // return if it's created, raise otherwise
    ds = create_static_datasource(params);
    if (ds)
    {
        return ds;
    }
#endif

    std::map<std::string,std::shared_ptr<PluginInfo> >::iterator itr;
    // add scope to ensure lock is released asap
    {
#ifdef MAPNIK_THREADSAFE
        std::lock_guard<std::recursive_mutex> lock(instance_mutex_);
#endif
        itr = plugins_.find(*type);
        if (itr == plugins_.end())
        {
            std::string s("Could not create datasource for type: '");
            s += *type + "'";
            if (plugin_directories_.empty())
            {
                s += " (no datasource plugin directories have been successfully registered)";
            }
            else
            {
                s += " (searched for datasource plugins in '" + plugin_directories() + "')";
            }
            throw config_error(s);
        }
    }

    if (!itr->second->valid())
    {
        throw std::runtime_error(std::string("Cannot load library: ") +
                                 itr->second->get_error());
    }

    // http://www.mr-edd.co.uk/blog/supressing_gcc_warnings
#ifdef __GNUC__
    __extension__
#endif
        create_ds create_datasource = reinterpret_cast<create_ds>(itr->second->get_symbol("create"));

    if (! create_datasource)
    {
        throw std::runtime_error(std::string("Cannot load symbols: ") +
                                 itr->second->get_error());
    }

    ds = datasource_ptr(create_datasource(params), datasource_deleter());

    return ds;
}

Example #2

File: datasource_cache.cpp Project: HUSSBV/mapnik

datasource_ptr datasource_cache::create(parameters const& params)
{
    boost::optional<std::string> type = params.get<std::string>("type");
    if ( ! type)
    {
        throw config_error(std::string("Could not create datasource. Required ") +
                           "parameter 'type' is missing");
    }

    datasource_ptr ds;

#ifdef MAPNIK_STATIC_PLUGINS
    // return if it's created, raise otherwise
    ds = create_static_datasource(params);
    if (ds)
    {
        return ds;
    }
#endif

#ifdef MAPNIK_THREADSAFE
    mapnik::scoped_lock lock(mutex_);
#endif

    std::map<std::string,std::shared_ptr<PluginInfo> >::iterator itr=plugins_.find(*type);
    if (itr == plugins_.end())
    {
        std::string s("Could not create datasource for type: '");
        s += *type + "'";
        if (plugin_directories_.empty())
        {
            s += " (no datasource plugin directories have been successfully registered)";
        }
        else
        {
            s += " (searched for datasource plugins in '" + plugin_directories() + "')";
        }
        throw config_error(s);
    }

    if (! itr->second->valid())
    {
        throw std::runtime_error(std::string("Cannot load library: ") +
                                 itr->second->get_error());
    }

    // http://www.mr-edd.co.uk/blog/supressing_gcc_warnings
#ifdef __GNUC__
    __extension__
#endif
        create_ds* create_datasource = reinterpret_cast<create_ds*>(itr->second->get_symbol("create"));

    if (! create_datasource)
    {
        throw std::runtime_error(std::string("Cannot load symbols: ") +
                                 itr->second->get_error());
    }

    ds = datasource_ptr(create_datasource(params), datasource_deleter());

#ifdef MAPNIK_LOG
    MAPNIK_LOG_DEBUG(datasource_cache)
        << "datasource_cache: Datasource="
        << ds << " type=" << type;

    MAPNIK_LOG_DEBUG(datasource_cache)
        << "datasource_cache: Size="
        << params.size();

    parameters::const_iterator i = params.begin();
    for (; i != params.end(); ++i)
    {
        MAPNIK_LOG_DEBUG(datasource_cache)
            << "datasource_cache: -- "
            << i->first << "=" << i->second;
    }
#endif

    return ds;
}