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/* Copyright (c) 2020, Dyssol Development Team.
* Copyright (c) 2023, DyssolTEC GmbH.
* All rights reserved. This file is part of Dyssol. See LICENSE file for license information. */
#include "StringFunctions.h"
#include "BaseCacheHandler.h"
#include "DyssolFilesystem.h"
#include <fstream>
namespace fs = std::filesystem;
CBaseCacheHandler::CBaseCacheHandler() :
m_dirPath(L"cache"),
m_fileNamePrefix(L""),
m_chunk(DEFAULT_CHUNK_SIZE),
m_fileExt(L".cache"),
m_fileName(L"")
{}
CBaseCacheHandler::~CBaseCacheHandler()
{
for (size_t i = 0; ; ++i)
{
const std::wstring sBufName = m_fileName + std::to_wstring(i) + m_fileExt;
if (fs::exists(StringFunctions::UnicodePath(sBufName)))
fs::remove(StringFunctions::UnicodePath(sBufName));
else
break;
}
}
void CBaseCacheHandler::ClearData() const
{
std::wstring sBufName = m_fileName + std::to_wstring(0) + m_fileExt;
std::ofstream file(StringFunctions::UnicodePath(sBufName), std::ios::out | std::ios::trunc | std::ios::binary);
file.close();
for (size_t i = 1; ; ++i)
{
sBufName = m_fileName + std::to_wstring(i) + m_fileExt;
if (fs::exists(StringFunctions::UnicodePath(sBufName)))
{
std::ofstream file(StringFunctions::UnicodePath(sBufName), std::ios::out | std::ios::trunc | std::ios::binary);
file.close();
}
else
break;
}
m_descriptors.clear();
}
void CBaseCacheHandler::SetChunk(size_t _chunk)
{
if (_chunk != 0)
m_chunk = _chunk;
}
void CBaseCacheHandler::SetDirPath(const std::wstring& _dirPath)
{
m_dirPath = _dirPath;
}
void CBaseCacheHandler::Initialize()
{
CreateFile();
}
size_t* CBaseCacheHandler::GetIndexToRead(double _t) const
{
auto* index = new size_t[2]();
if (_t < m_descriptors.front().timeEnd)
index[0] = index[1] = 0;
else if (_t == m_descriptors.front().timeEnd && _t == m_descriptors.front().timeStart)
index[0] = index[1] = 0;
else if (_t > m_descriptors.back().timeStart)
index[0] = index[1] = m_descriptors.size() - 1;
else
for (index[0] = 1; index[0] < m_descriptors.size(); ++index[0])
if (_t > m_descriptors[index[0]].timeStart && _t < m_descriptors[index[0]].timeEnd)
{
index[1] = index[0];
break;
}
else if (_t >= m_descriptors[index[0] - 1].timeEnd && _t <= m_descriptors[index[0]].timeStart)
{
index[1] = index[0];
index[0] -= 1;
break;
}
return index;
}
size_t* CBaseCacheHandler::GetIndexToRead(double _t1, double _t2) const
{
auto* index = new size_t[2]();
if (_t2 < _t1)
std::swap(_t1, _t2);
if (_t1 < m_descriptors.front().timeEnd)
index[0] = 0;
else if (_t1 > m_descriptors.back().timeStart)
index[0] = m_descriptors.size() - 1;
else
for (index[0] = 1; index[0] < m_descriptors.size(); ++index[0])
if (_t1 > m_descriptors[index[0]].timeStart && _t1 < m_descriptors[index[0]].timeEnd)
break;
else if (_t1 >= m_descriptors[index[0] - 1].timeEnd && _t1 <= m_descriptors[index[0]].timeStart)
{
index[0] -= 1;
break;
}
if (index[0] >= m_descriptors.size())
index[0] = m_descriptors.size() - 1;
if (_t2 < m_descriptors.front().timeEnd)
index[1] = 0;
else if (_t2 > m_descriptors.back().timeStart)
index[1] = m_descriptors.size() - 1;
else
for (index[1] = index[0]; index[1] < m_descriptors.size(); ++index[1])
if (_t2 > m_descriptors[index[1]].timeStart && _t2 < m_descriptors[index[1]].timeEnd)
break;
else if (index[1] > 0 && _t2 >= m_descriptors[index[1] - 1].timeEnd && _t2 <= m_descriptors[index[1]].timeStart)
break;
if (index[1] >= m_descriptors.size())
index[1] = m_descriptors.size() - 1;
return index;
}
void CBaseCacheHandler::GetIndexToWrite(const std::vector<double>& _tp, size_t _tStart, size_t& _index, bool& _bInsert) const
{
_bInsert = false;
if (m_descriptors.empty())
{
_index = 0;
return;
}
for (_index = 0; _index < m_descriptors.size(); ++_index)
if (!m_descriptors[_index].valid)
{
for (size_t i = _index + 1; i < m_descriptors.size(); ++i)
if (m_descriptors[i].valid)
{
_bInsert = true;
break;
}
break;
}
if (_tp[_tStart] < m_descriptors.back().timeEnd && _index == m_descriptors.size()) // no invalid blocks ==> search by times
{
_bInsert = true;
for (_index = 0; _index < m_descriptors.size(); ++_index)
if (_tp[_tStart] < m_descriptors[_index].timeStart)
break;
}
}
void CBaseCacheHandler::CreateFile()
{
if (!fs::exists(StringFunctions::UnicodePath(m_dirPath)))
fs::create_directory(StringFunctions::UnicodePath(m_dirPath));
m_fileName = m_dirPath + L"/" + m_fileNamePrefix + StringFunctions::String2WString(StringFunctions::GenerateRandomKey());
std::wstring sBufName = m_fileName + L"0" + m_fileExt;
while (fs::exists(StringFunctions::UnicodePath(sBufName)))
{
m_fileName = m_dirPath + L"/" + m_fileNamePrefix + StringFunctions::String2WString(StringFunctions::GenerateRandomKey());
sBufName = m_fileName + L"0" + m_fileExt;
}
std::ofstream file(StringFunctions::UnicodePath(sBufName), std::ios::out | std::ios::trunc | std::ios::binary);
file.close();
}
std::ifstream* CBaseCacheHandler::OpenFileToRead(size_t _dataIndex) const
{
const std::wstring bufName = m_fileName + std::to_wstring(m_descriptors[_dataIndex].fileNumber) + m_fileExt;
std::ifstream *pFile = new std::ifstream(StringFunctions::UnicodePath(bufName), std::ios::out | std::ios::binary);
pFile->seekg(static_cast<std::streamoff>(m_descriptors[_dataIndex].filePosition), std::ifstream::beg);
return pFile;
}
std::fstream* CBaseCacheHandler::OpenFileToWrite(SDescriptor& _currDescriptor, bool _bInsert, size_t _entitiesNum, uint64_t _bytesToWrite) const
{
std::fstream *pFile;
if (!_bInsert && _currDescriptor.descriptorNumber <= _entitiesNum)
{
const std::wstring bufName = m_fileName + std::to_wstring(_currDescriptor.fileNumber) + m_fileExt;
pFile = new std::fstream(StringFunctions::UnicodePath(bufName), std::ios::in | std::ios::out | std::ios::binary);
pFile->seekp(static_cast<std::streamoff>(_currDescriptor.filePosition));
}
else
{
for (size_t iFile = 0; ; ++iFile)
{
const std::wstring bufName = m_fileName + std::to_wstring(iFile) + m_fileExt;
if (!fs::exists(StringFunctions::UnicodePath(bufName))) // file not exists
{
pFile = new std::fstream(StringFunctions::UnicodePath(bufName), std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary);
_currDescriptor.fileNumber = iFile;
_currDescriptor.filePosition = 0;
break;
}
else if (const std::uintmax_t currFileSize = fs::file_size(StringFunctions::UnicodePath(bufName)); currFileSize + _bytesToWrite < MAX_CACHE_FILE_SIZE)
{
pFile = new std::fstream(StringFunctions::UnicodePath(bufName), std::ios::in | std::ios::out | std::ios::binary | std::ios::ate);
_currDescriptor.fileNumber = iFile;
_currDescriptor.filePosition = currFileSize;
break;
}
}
}
return pFile;
}
void CBaseCacheHandler::RemoveUnusedBlocks() const
{
for (size_t iFile = 0; ; ++iFile)
{
std::wstring bufName = m_fileName + std::to_wstring(iFile) + m_fileExt;
if (fs::exists(StringFunctions::UnicodePath(bufName)))
{
std::streamoff minInvalidOffset = -1;
for (auto& descriptor : m_descriptors)
if (!descriptor.valid && descriptor.fileNumber == iFile)
{
minInvalidOffset = descriptor.filePosition;
break;
}
if (minInvalidOffset == -1)
continue;
std::streamoff maxValidOffset = 0;
for (auto& descriptor : m_descriptors)
{
if (descriptor.fileNumber == iFile)
{
if (descriptor.valid)
{
if (descriptor.filePosition > maxValidOffset)
maxValidOffset = descriptor.filePosition;
}
else
{
if (descriptor.filePosition < minInvalidOffset)
minInvalidOffset = descriptor.filePosition;
}
}
}
if (maxValidOffset < minInvalidOffset)
fs::resize_file(StringFunctions::UnicodePath(bufName), minInvalidOffset);
}
else
break;
}
}
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