greenplumn CFileWriter 源码
greenplumn CFileWriter 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/io/CFileWriter.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CFileWriter.h
//
// @doc:
// File writer
//---------------------------------------------------------------------------
#ifndef GPOS_CFileWriter_H
#define GPOS_CFileWriter_H
#include "gpos/io/CFileDescriptor.h"
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CFileWriter
//
// @doc:
// Implementation of file handler for raw output;
// does not provide thread-safety
//
//---------------------------------------------------------------------------
class CFileWriter : public CFileDescriptor
{
private:
// file size
ULLONG m_file_size{0};
public:
CFileWriter(const CFileWriter &) = delete;
// ctor
CFileWriter();
// dtor
~CFileWriter() override = default;
ULLONG
FileSize() const
{
return m_file_size;
}
// open file for writing
void Open(const CHAR *file_path, ULONG permission_bits);
// close file
void Close();
// write bytes to file
void Write(const BYTE *read_buffer, const ULONG_PTR write_size);
}; // class CFileWriter
} // namespace gpos
#endif // !GPOS_CFileWriter_H
// EOF
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