tkrzw::DBMUpdateLoggerStrDeque Class Reference

DBM update logger to store logs into a string deque. More...

#include <tkrzw_dbm_ulog.h>

Public Member Functions
	DBMUpdateLoggerStrDeque (const std::string &delim="\t")
	Constructor. More...
Status	WriteSet (std::string_view key, std::string_view value) override
	Writes a log for modifying an existing record or adding a new record. More...
Status	WriteRemove (std::string_view key) override
	Writes a log for removing an existing record. More...
Status	WriteClear () override
	Writes a log for removing all records. More...
int64_t	GetSize ()
	Gets the number of logs. More...
bool	PopFront (std::string *text)
	Gets the first log in the queue and removes it. More...
bool	PopBack (std::string *text)
	Gets the last log in the queue and removes it. More...
void	Clear ()
	Removes all logs. More...
Public Member Functions inherited from tkrzw::DBM::UpdateLogger
virtual	~UpdateLogger ()=default
	Destructor. More...
virtual Status	Synchronize (bool hard)
	Synchronizes the metadata and content to the file system. More...

Detailed Description

DBM update logger to store logs into a string deque.

Constructor & Destructor Documentation

DBMUpdateLoggerStrDeque()

tkrzw::DBMUpdateLoggerStrDeque::DBMUpdateLoggerStrDeque ( const std::string &  delim = "\t" )

explicit

Constructor.

Parameters

delim

The delimiter put between fields in a log.

Member Function Documentation

WriteSet()

Status tkrzw::DBMUpdateLoggerStrDeque::WriteSet ( std::string_view  key, std::string_view  value  )

overridevirtual

Writes a log for modifying an existing record or adding a new record.

Parameters

key	The key of the record.
value	The new value of the record.

Returns

The result status.

Implements tkrzw::DBM::UpdateLogger.

WriteRemove()

Status tkrzw::DBMUpdateLoggerStrDeque::WriteRemove ( std::string_view  key )

overridevirtual

Writes a log for removing an existing record.

Parameters

key	The key of the record.

Returns

The result status.

Implements tkrzw::DBM::UpdateLogger.

WriteClear()

Status tkrzw::DBMUpdateLoggerStrDeque::WriteClear ( )

overridevirtual

Writes a log for removing all records.

Returns

The result status.

Implements tkrzw::DBM::UpdateLogger.

GetSize()

int64_t tkrzw::DBMUpdateLoggerStrDeque::GetSize

(

)

Gets the number of logs.

Returns

The number of logs.

PopFront()

bool tkrzw::DBMUpdateLoggerStrDeque::PopFront

(

std::string *

text

)

Gets the first log in the queue and removes it.

Parameters

text	The pointer to a string object to store the result. If it is nullptr, assignment is not done.

Returns

True on success or false if there's no log in the queue.

PopBack()

bool tkrzw::DBMUpdateLoggerStrDeque::PopBack

(

std::string *

text

)

Gets the last log in the queue and removes it.

Parameters

text	The pointer to a string object to store the result. If it is nullptr, assignment is not done.

Returns

True on success or false if there's no log in the queue.

Clear()

void tkrzw::DBMUpdateLoggerStrDeque::Clear

(

)

Removes all logs.