IOAdaptorBase is the base class of I/O adaptors. More...

#include <io_adaptor_base.h>

Inheritance diagram for grape::IOAdaptorBase:

Public Member Functions
virtual void	Open ()=0

virtual void	Open (const char *mode)=0

virtual void	Close ()=0

virtual bool	Configure (const std::string &key, const std::string &value)=0
	Configure sub-class specific items. e.g., odps_access_key = abcd; oss_read_concurrency = 16; whether ReadLine for local location uses std::getline;.

virtual bool	SetPartialRead (int index, int total_parts)=0
	Set each worker only scan related parts of the whole file.

virtual bool	ReadLine (std::string &line)=0

virtual bool	ReadArchive (OutArchive &archive)=0

virtual bool	WriteArchive (InArchive &archive)=0

virtual bool	Read (void *buffer, size_t size)=0

virtual bool	Write (void *buffer, size_t size)=0

virtual void	MakeDirectory (const std::string &path)=0

virtual bool	IsExist ()=0

Detailed Description

IOAdaptorBase is the base class of I/O adaptors.

Note: : The pure virtual functions in the class work as interfaces, instructing sub-classes to implement. The override functions in the derived classes would be invoked directly, not via virtual functions.

Member Function Documentation

virtual bool grape::IOAdaptorBase::Configure	(	const std::string &	key,
		const std::string &	value
	)

pure virtual

Configure sub-class specific items. e.g., odps_access_key = abcd; oss_read_concurrency = 16; whether ReadLine for local location uses std::getline;.

virtual bool grape::IOAdaptorBase::SetPartialRead	(	int	index,
		int	total_parts
	)

pure virtual

Set each worker only scan related parts of the whole file.

for local: read with offset, from a big file.