105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/util/fs.hpp>
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#include <mapnik/mapped_memory_cache.hpp>
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.hpp>
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#include <boost/assert.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <boost/interprocess/file_mapping.hpp>
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MAPNIK_DISABLE_WARNING_POP
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namespace mapnik
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{
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template class singleton<mapped_memory_cache, CreateStatic>;
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void mapped_memory_cache::clear()
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{
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#ifdef MAPNIK_THREADSAFE
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std::lock_guard<std::mutex> lock(mutex_);
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#endif
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return cache_.clear();
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}
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bool mapped_memory_cache::insert(std::string const& uri, mapped_region_ptr mem)
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{
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#ifdef MAPNIK_THREADSAFE
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std::lock_guard<std::mutex> lock(mutex_);
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#endif
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return cache_.emplace(uri,mem).second;
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}
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boost::optional<mapped_region_ptr> mapped_memory_cache::find(std::string const& uri, bool update_cache)
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{
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#ifdef MAPNIK_THREADSAFE
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std::lock_guard<std::mutex> lock(mutex_);
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#endif
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using iterator_type = std::unordered_map<std::string, mapped_region_ptr>::const_iterator;
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boost::optional<mapped_region_ptr> result;
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iterator_type itr = cache_.find(uri);
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if (itr != cache_.end())
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{
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result.reset(itr->second);
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return result;
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}
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if (mapnik::util::exists(uri))
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{
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try
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{
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boost::interprocess::file_mapping mapping(uri.c_str(),boost::interprocess::read_only);
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mapped_region_ptr region(std::make_shared<boost::interprocess::mapped_region>(mapping,boost::interprocess::read_only));
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result.reset(region);
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if (update_cache)
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{
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cache_.emplace(uri, *result);
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}
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return result;
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}
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catch (std::exception const& ex)
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{
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MAPNIK_LOG_ERROR(mapped_memory_cache)
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<< "Error loading mapped memory file: '"
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<< uri << "' (" << ex.what() << ")";
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}
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}
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/*
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else
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{
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MAPNIK_LOG_WARN(mapped_memory_cache) << "Memory region does not exist file: " << uri;
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}
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*/
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return result;
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}
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}
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#endif
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