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#include "coding/file_reader.hpp"
#include "coding/reader_cache.hpp"
#include "coding/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, bool withExceptions,
uint32_t logPageSize, uint32_t logPageCount)
: BaseType(fileName)
, m_fileData(new FileReaderData(fileName, logPageSize, logPageCount))
, m_offset(0)
, m_size(m_fileData->Size())
, m_withExceptions(withExceptions)
{}
FileReader::FileReader(FileReader const & reader, uint64_t offset, uint64_t size)
: BaseType(reader.GetName())
, m_fileData(reader.m_fileData)
, m_offset(offset)
, m_size(size)
, m_withExceptions(reader.m_withExceptions)
{}
uint64_t FileReader::Size() const
{
return m_size;
}
void FileReader::Read(uint64_t pos, void * p, size_t size) const
{
CheckPosAndSize(pos, size);
m_fileData->Read(m_offset + pos, p, size);
}
FileReader FileReader::SubReader(uint64_t pos, uint64_t size) const
{
CheckPosAndSize(pos, size);
return FileReader(*this, m_offset + pos, size);
}
unique_ptr<Reader> FileReader::CreateSubReader(uint64_t pos, uint64_t size) const
{
CheckPosAndSize(pos, size);
// Can't use make_unique with private constructor.
return unique_ptr<Reader>(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);
if (!m_withExceptions)
ASSERT(ret1, (pos, size, allSize1));
uint64_t const allSize2 = m_fileData->Size();
bool const ret2 = (m_offset + pos + size <= allSize2);
if (!m_withExceptions)
ASSERT(ret2, (m_offset, pos, size, allSize2));
return (ret1 && ret2);
}
void FileReader::CheckPosAndSize(uint64_t pos, uint64_t size) const
{
if (m_withExceptions && !AssertPosAndSize(pos, size))
MYTHROW(Reader::SizeException, (pos, size));
else
ASSERT(AssertPosAndSize(pos, size), ());
}
void FileReader::SetOffsetAndSize(uint64_t offset, uint64_t size)
{
CheckPosAndSize(offset, size);
m_offset = offset;
m_size = size;
}
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