89 lines
3.2 KiB
C++
89 lines
3.2 KiB
C++
/*
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open source routing machine
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Copyright (C) Dennis Luxen, others 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU AFFERO General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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or see http://www.gnu.org/licenses/agpl.txt.
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*/
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#ifndef TEMPORARYSTORAGE_H_
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#define TEMPORARYSTORAGE_H_
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#include <vector>
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#include <fstream>
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#include <boost/filesystem.hpp>
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#include <boost/filesystem/fstream.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/thread/mutex.hpp>
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#include "../typedefs.h"
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/**
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* This class implements a singleton file storage for temporary data.
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* temporary slots can be accessed by other objects through an int
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* On deallocation every slot gets deallocated
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*
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* Access is sequential, which means, that there is no random access
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* -> Data is written in first phase and reread in second.
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*/
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static boost::filesystem3::path tempDirectory;
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static std::string TemporaryFilePattern("OSRM-%%%%-%%%%-%%%%");
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class TemporaryStorage {
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public:
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static TemporaryStorage & GetInstance();
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virtual ~TemporaryStorage();
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int allocateSlot();
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void deallocateSlot(int slotID);
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void writeToSlot(int slotID, char * pointer, std::streamsize size);
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void readFromSlot(int slotID, char * pointer, std::streamsize size);
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//returns the number of free bytes
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unsigned getFreeBytesOnTemporaryDevice();
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boost::filesystem3::fstream::pos_type tell(int slotID);
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void seek(int slotID, boost::filesystem3::fstream::pos_type);
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void removeAll();
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private:
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TemporaryStorage();
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TemporaryStorage(TemporaryStorage const &){};
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TemporaryStorage& operator=(TemporaryStorage const &) {
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return *this;
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}
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void abort(boost::filesystem3::filesystem_error& e);
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;
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struct StreamData {
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bool writeMode;
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boost::filesystem3::path pathToTemporaryFile;
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boost::shared_ptr<boost::filesystem3::fstream> streamToTemporaryFile;
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boost::shared_ptr<boost::mutex> readWriteMutex;
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StreamData() :
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writeMode(true),
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pathToTemporaryFile (boost::filesystem3::unique_path(tempDirectory.append(TemporaryFilePattern.begin(), TemporaryFilePattern.end()))),
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streamToTemporaryFile(new boost::filesystem3::fstream(pathToTemporaryFile, std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary)),
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readWriteMutex(new boost::mutex)
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{
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if(streamToTemporaryFile->fail())
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ERR("Aborting, because temporary file at " << pathToTemporaryFile << " could not be created");
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}
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};
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//vector of file streams that is used to store temporary data
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std::vector<StreamData> vectorOfStreamDatas;
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boost::mutex mutex;
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};
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#endif /* TEMPORARYSTORAGE_H_ */
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