119 lines
4.1 KiB
C++
119 lines
4.1 KiB
C++
/*
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Copyright (c) 2013, Project OSRM, Dennis Luxen, others
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TEMPORARYSTORAGE_H_
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#define TEMPORARYSTORAGE_H_
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#include "../Util/BoostFileSystemFix.h"
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#include "../Util/OSRMException.h"
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#include "../Util/SimpleLogger.h"
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#include "../typedefs.h"
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#include <boost/assert.hpp>
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#include <boost/foreach.hpp>
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#include <boost/integer.hpp>
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#include <boost/filesystem.hpp>
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#include <boost/filesystem/fstream.hpp>
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#include <boost/make_shared.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/thread/mutex.hpp>
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#include <vector>
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#include <fstream>
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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::filesystem::path temp_directory;
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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(const int slot_id);
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void WriteToSlot(const int slot_id, char * pointer, const std::size_t size);
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void ReadFromSlot(const int slot_id, char * pointer, const std::size_t size);
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//returns the number of free bytes
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uint64_t GetFreeBytesOnTemporaryDevice();
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boost::filesystem::fstream::pos_type Tell(const int slot_id);
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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(const boost::filesystem::filesystem_error& e);
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void CheckIfTemporaryDeviceFull();
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struct StreamData {
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bool write_mode;
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boost::filesystem::path temp_path;
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boost::shared_ptr<boost::filesystem::fstream> temp_file;
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boost::shared_ptr<boost::mutex> readWriteMutex;
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std::vector<char> buffer;
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StreamData() :
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write_mode(true),
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temp_path(
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boost::filesystem::unique_path(
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temp_directory.append(
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TemporaryFilePattern.begin(),
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TemporaryFilePattern.end()
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)
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)
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),
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temp_file(
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new boost::filesystem::fstream(
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temp_path,
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std::ios::in|std::ios::out|std::ios::trunc|std::ios::binary
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)
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),
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readWriteMutex(boost::make_shared<boost::mutex>())
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{
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if( temp_file->fail() ) {
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throw OSRMException("temporary file could not be created");
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}
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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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boost::mutex mutex;
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std::vector<StreamData> stream_data_list;
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};
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#endif /* TEMPORARYSTORAGE_H_ */
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