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#include "file_reader.hpp"
#include "reader_cache.hpp"
#include "internal/file_data.hpp"
#ifndef LOG_FILE_READER_STATS
#define LOG_FILE_READER_STATS 0
#endif // LOG_FILE_READER_STATS
#if LOG_FILE_READER_STATS && !defined(LOG_FILE_READER_EVERY_N_READS_MASK)
#define LOG_FILE_READER_EVERY_N_READS_MASK 0xFFFFFFFF
#endif
namespace
{
class FileDataWithCachedSize : public my::FileData
{
typedef my::FileData base_t;
public:
explicit FileDataWithCachedSize(string const & fileName)
: base_t(fileName, FileData::OP_READ), m_Size(FileData::Size()) {}
uint64_t Size() const { return m_Size; }
private:
uint64_t m_Size;
};
}
class FileReader::FileReaderData
{
public:
FileReaderData(string const & fileName, uint32_t logPageSize, uint32_t logPageCount)
: m_FileData(fileName), m_ReaderCache(logPageSize, logPageCount)
{
#if LOG_FILE_READER_STATS
m_ReadCallCount = 0;
#endif
}
~FileReaderData()
{
#if LOG_FILE_READER_STATS
LOG(LINFO, ("FileReader", GetName(), m_ReaderCache.GetStatsStr()));
#endif
}
uint64_t Size() const { return m_FileData.Size(); }
void Read(uint64_t pos, void * p, size_t size)
{
#if LOG_FILE_READER_STATS
if (((++m_ReadCallCount) & LOG_FILE_READER_EVERY_N_READS_MASK) == 0)
{
LOG(LINFO, ("FileReader", GetName(), m_ReaderCache.GetStatsStr()));
}
#endif
return m_ReaderCache.Read(m_FileData, pos, p, size);
}
private:
FileDataWithCachedSize m_FileData;
ReaderCache<FileDataWithCachedSize, LOG_FILE_READER_STATS> m_ReaderCache;
#if LOG_FILE_READER_STATS
uint32_t m_ReadCallCount;
#endif
};
FileReader::FileReader(string const & fileName, uint32_t logPageSize, uint32_t logPageCount)
: base_type(fileName), m_pFileData(new FileReaderData(fileName, logPageSize, logPageCount)),
m_Offset(0), m_Size(m_pFileData->Size())
{
}
FileReader::FileReader(FileReader const & reader, uint64_t offset, uint64_t size)
: base_type(reader.GetName()), m_pFileData(reader.m_pFileData), m_Offset(offset), m_Size(size)
{
}
uint64_t FileReader::Size() const
{
return m_Size;
}
void FileReader::Read(uint64_t pos, void * p, size_t size) const
{
ASSERT ( AssertPosAndSize(pos, size), () );
m_pFileData->Read(m_Offset + pos, p, size);
}
FileReader FileReader::SubReader(uint64_t pos, uint64_t size) const
{
ASSERT ( AssertPosAndSize(pos, size), () );
return FileReader(*this, m_Offset + pos, size);
}
FileReader * FileReader::CreateSubReader(uint64_t pos, uint64_t size) const
{
ASSERT ( AssertPosAndSize(pos, size), () );
return new FileReader(*this, m_Offset + pos, size);
}
bool FileReader::AssertPosAndSize(uint64_t pos, uint64_t size) const
{
uint64_t const allSize1 = Size();
bool const ret1 = (pos + size <= allSize1);
ASSERT ( ret1, (pos, size, allSize1) );
uint64_t const allSize2 = m_pFileData->Size();
bool const ret2 = (m_Offset + pos + size <= allSize2);
ASSERT ( ret2, (m_Offset, pos, size, allSize2) );
return (ret1 && ret2);
}
void FileReader::SetOffsetAndSize(uint64_t offset, uint64_t size)
{
ASSERT ( AssertPosAndSize(offset, size), () );
m_Offset = offset;
m_Size = size;
}
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