Plant database. More...

#include <kcplantdb.h>

Classes
class	Cursor
	Cursor to indicate a record. More...
struct	InnerNode
	Inner node of B+ tree.
struct	InnerSlot
	Slot cache of inner nodes.
struct	LeafNode
	Leaf node of B+ tree.
struct	LeafSlot
	Slot cache of leaf nodes.
struct	Link
	Link to a node.
struct	LinkComparator
	Comparator for links.
struct	Record
	Record data.
struct	RecordComparator
	Comparator for records.
class	ScopedVisitor
	Scoped visitor.
Public Types
enum	Option { TSMALL = BASEDB::TSMALL, TLINEAR = BASEDB::TLINEAR, TCOMPRESS = BASEDB::TCOMPRESS }
	Tuning options. More...
enum	Flag { FOPEN = BASEDB::FOPEN, FFATAL = BASEDB::FFATAL }
	Status flags. More...
Public Member Functions
	PlantDB ()
	Default constructor.
virtual	~PlantDB ()
	Destructor.
bool	accept (const char kbuf, size_t ksiz, Visitor visitor, bool writable=true)
	Accept a visitor to a record.
bool	accept_bulk (const std::vector< std::string > &keys, Visitor *visitor, bool writable=true)
	Accept a visitor to multiple records at once.
bool	iterate (Visitor visitor, bool writable=true, ProgressChecker checker=NULL)
	Iterate to accept a visitor for each record.
bool	scan_parallel (Visitor visitor, size_t thnum, ProgressChecker checker=NULL)
	Scan each record in parallel.
Error	error () const
	Get the last happened error.
void	set_error (const char file, int32_t line, const char func, Error::Code code, const char *message)
	Set the error information.
bool	open (const std::string &path, uint32_t mode=OWRITER\|OCREATE)
	Open a database file.
bool	close ()
	Close the database file.
bool	synchronize (bool hard=false, FileProcessor proc=NULL, ProgressChecker checker=NULL)
	Synchronize updated contents with the file and the device.
bool	occupy (bool writable=true, FileProcessor *proc=NULL)
	Occupy database by locking and do something meanwhile.
bool	begin_transaction (bool hard=false)
	Begin transaction.
bool	begin_transaction_try (bool hard=false)
	Try to begin transaction.
bool	end_transaction (bool commit=true)
	End transaction.
bool	clear ()
	Remove all records.
int64_t	count ()
	Get the number of records.
int64_t	size ()
	Get the size of the database file.
std::string	path ()
	Get the path of the database file.
bool	status (std::map< std::string, std::string > *strmap)
	Get the miscellaneous status information.
Cursor *	cursor ()
	Create a cursor object.
void	log (const char file, int32_t line, const char func, Logger::Kind kind, const char *message)
	Write a log message.
bool	tune_logger (Logger *logger, uint32_t kinds=Logger::WARN\|Logger::ERROR)
	Set the internal logger.
bool	tune_meta_trigger (MetaTrigger *trigger)
	Set the internal meta operation trigger.
bool	tune_alignment (int8_t apow)
	Set the power of the alignment of record size.
bool	tune_fbp (int8_t fpow)
	Set the power of the capacity of the free block pool.
bool	tune_options (int8_t opts)
	Set the optional features.
bool	tune_buckets (int64_t bnum)
	Set the number of buckets of the hash table.
bool	tune_page (int32_t psiz)
	Set the size of each page.
bool	tune_map (int64_t msiz)
	Set the size of the internal memory-mapped region.
bool	tune_defrag (int64_t dfunit)
	Set the unit step number of auto defragmentation.
bool	tune_page_cache (int64_t pccap)
	Set the capacity size of the page cache.
bool	tune_compressor (Compressor *comp)
	Set the data compressor.
bool	tune_comparator (Comparator *rcomp)
	Set the record comparator.
char *	opaque ()
	Get the opaque data.
bool	synchronize_opaque ()
	Synchronize the opaque data.
bool	defrag (int64_t step=0)
	Perform defragmentation of the file.
uint8_t	flags ()
	Get the status flags.
Comparator *	rcomp ()
	Get the record comparator.
Protected Member Functions
void	report (const char file, int32_t line, const char func, Logger::Kind kind, const char *format,...)
	Report a message for debugging.
void	report_valist (const char file, int32_t line, const char func, Logger::Kind kind, const char *format, va_list ap)
	Report a message for debugging with variable number of arguments.
void	report_binary (const char file, int32_t line, const char func, Logger::Kind kind, const char name, const char buf, size_t size)
	Report the content of a binary buffer for debugging.
void	trigger_meta (MetaTrigger::Kind kind, const char *message)
	Trigger a meta database operation.

Detailed Description

template<class BASEDB, uint8_t DBTYPE>
class kyotocabinet::PlantDB< BASEDB, DBTYPE >

Plant database.

Parameters:

BASEDB	a class compatible with the file hash database class.
DBTYPE	the database type number of the class.

Note:: This class template is a template for concrete classes to operate tree databases. Template instance classes can be inherited but overwriting methods is forbidden. The class TreeDB is the instance of the file tree database. The class ForestDB is the instance of the directory tree database. Before every database operation, it is necessary to call the BasicDB::open method in order to open a database file and connect the database object to it. To avoid data missing or corruption, it is important to close every database file by the BasicDB::close method when the database is no longer in use. It is forbidden for multible database objects in a process to open the same database at the same time. It is forbidden to share a database object with child processes.

Member Enumeration Documentation

template<class BASEDB , uint8_t DBTYPE>

enum kyotocabinet::PlantDB::Option

Tuning options.

Enumerator:

TSMALL	use 32-bit addressing
TLINEAR	use linear collision chaining
TCOMPRESS	compress each record

template<class BASEDB , uint8_t DBTYPE>

enum kyotocabinet::PlantDB::Flag

Status flags.

Enumerator:

FOPEN	whether opened
FFATAL	whether with fatal error

Constructor & Destructor Documentation

template<class BASEDB , uint8_t DBTYPE>

kyotocabinet::PlantDB< BASEDB, DBTYPE >::PlantDB ( ) [explicit]

Default constructor.

template<class BASEDB , uint8_t DBTYPE>

virtual kyotocabinet::PlantDB< BASEDB, DBTYPE >::~PlantDB ( ) [virtual]

Destructor.

Note:: If the database is not closed, it is closed implicitly.

Member Function Documentation

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::accept	(	const char *	kbuf,
		size_t	ksiz,
		Visitor *	visitor,
		bool	writable = `true`
	)		`[virtual]`

Accept a visitor to a record.

Parameters:

kbuf	the pointer to the key region.
ksiz	the size of the key region.
visitor	a visitor object.
writable	true for writable operation, or false for read-only operation.

Returns:: true on success, or false on failure.

Note:: The operation for each record is performed atomically and other threads accessing the same record are blocked. To avoid deadlock, any explicit database operation must not be performed in this function.

Implements kyotocabinet::DB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::accept_bulk	(	const std::vector< std::string > &	keys,
		Visitor *	visitor,
		bool	writable = `true`
	)		`[virtual]`

Accept a visitor to multiple records at once.

Parameters:

keys	specifies a string vector of the keys.
visitor	a visitor object.
writable	true for writable operation, or false for read-only operation.

Returns:: true on success, or false on failure.

Note:: The operations for specified records are performed atomically and other threads accessing the same records are blocked. To avoid deadlock, any explicit database operation must not be performed in this function.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::iterate	(	Visitor *	visitor,
		bool	writable = `true`,
		ProgressChecker *	checker = `NULL`
	)		`[virtual]`

Iterate to accept a visitor for each record.

Parameters:

visitor	a visitor object.
writable	true for writable operation, or false for read-only operation.
checker	a progress checker object. If it is NULL, no checking is performed.

Returns:: true on success, or false on failure.

Note:: The whole iteration is performed atomically and other threads are blocked. To avoid deadlock, any explicit database operation must not be performed in this function.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::scan_parallel	(	Visitor *	visitor,
		size_t	thnum,
		ProgressChecker *	checker = `NULL`
	)		`[virtual]`

Scan each record in parallel.

Parameters:

visitor	a visitor object.
thnum	the number of worker threads.
checker	a progress checker object. If it is NULL, no checking is performed.

Returns:: true on success, or false on failure.

Note:: This function is for reading records and not for updating ones. The return value of the visitor is just ignored. To avoid deadlock, any explicit database operation must not be performed in this function.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

Error kyotocabinet::PlantDB< BASEDB, DBTYPE >::error ( ) const [virtual]

Get the last happened error.

Returns:: the last happened error.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

void kyotocabinet::PlantDB< BASEDB, DBTYPE >::set_error	(	const char *	file,
		int32_t	line,
		const char *	func,
		Error::Code	code,
		const char *	message
	)

Set the error information.

Parameters:

file	the file name of the program source code.
line	the line number of the program source code.
func	the function name of the program source code.
code	an error code.
message	a supplement message.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::open	(	const std::string &	path,
		uint32_t	mode = `OWRITER \| OCREATE`
	)		`[virtual]`

Open a database file.

Parameters:

path the path of a database file.

mode the connection mode. BasicDB::OWRITER as a writer, BasicDB::OREADER as a reader. The following may be added to the writer mode by bitwise-or: BasicDB::OCREATE, which means it creates a new database if the file does not exist, BasicDB::OTRUNCATE, which means it creates a new database regardless if the file exists, BasicDB::OAUTOTRAN, which means each updating operation is performed in implicit transaction, BasicDB::OAUTOSYNC, which means each updating operation is followed by implicit synchronization with the file system. The following may be added to both of the reader mode and the writer mode by bitwise-or: BasicDB::ONOLOCK, which means it opens the database file without file locking, BasicDB::OTRYLOCK, which means locking is performed without blocking, BasicDB::ONOREPAIR, which means the database file is not repaired implicitly even if file destruction is detected.

Returns:: true on success, or false on failure.

Note:: Every opened database must be closed by the BasicDB::close method when it is no longer in use. It is not allowed for two or more database objects in the same process to keep their connections to the same database file at the same time.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::close ( ) [virtual]

Close the database file.

Returns:: true on success, or false on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::synchronize	(	bool	hard = `false`,
		FileProcessor *	proc = `NULL`,
		ProgressChecker *	checker = `NULL`
	)		`[virtual]`

Synchronize updated contents with the file and the device.

Parameters:

hard	true for physical synchronization with the device, or false for logical synchronization with the file system.
proc	a postprocessor object. If it is NULL, no postprocessing is performed.
checker	a progress checker object. If it is NULL, no checking is performed.

Returns:: true on success, or false on failure.

Note:: The operation of the postprocessor is performed atomically and other threads accessing the same record are blocked. To avoid deadlock, any explicit database operation must not be performed in this function.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::occupy	(	bool	writable = `true`,
		FileProcessor *	proc = `NULL`
	)		`[virtual]`

Occupy database by locking and do something meanwhile.

Parameters:

writable	true to use writer lock, or false to use reader lock.
proc	a processor object. If it is NULL, no processing is performed.

Returns:: true on success, or false on failure.

Note:: The operation of the processor is performed atomically and other threads accessing the same record are blocked. To avoid deadlock, any explicit database operation must not be performed in this function.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::begin_transaction ( bool hard = false ) [virtual]

Begin transaction.

Parameters:

hard	true for physical synchronization with the device, or false for logical synchronization with the file system.

Returns:: true on success, or false on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::begin_transaction_try ( bool hard = false ) [virtual]

Try to begin transaction.

Parameters:

hard	true for physical synchronization with the device, or false for logical synchronization with the file system.

Returns:: true on success, or false on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::end_transaction ( bool commit = true ) [virtual]

End transaction.

Parameters:

commit true to commit the transaction, or false to abort the transaction.

Returns:: true on success, or false on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::clear ( ) [virtual]

Remove all records.

Returns:: true on success, or false on failure.

Implements kyotocabinet::DB.

template<class BASEDB , uint8_t DBTYPE>

int64_t kyotocabinet::PlantDB< BASEDB, DBTYPE >::count ( ) [virtual]

Get the number of records.

Returns:: the number of records, or -1 on failure.

Implements kyotocabinet::DB.

template<class BASEDB , uint8_t DBTYPE>

int64_t kyotocabinet::PlantDB< BASEDB, DBTYPE >::size ( ) [virtual]

Get the size of the database file.

Returns:: the size of the database file in bytes, or -1 on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

std::string kyotocabinet::PlantDB< BASEDB, DBTYPE >::path ( ) [virtual]

Get the path of the database file.

Returns:: the path of the database file, or an empty string on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::status ( std::map< std::string, std::string > * strmap ) [virtual]

Get the miscellaneous status information.

Parameters:

strmap a string map to contain the result.

Returns:: true on success, or false on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

Cursor* kyotocabinet::PlantDB< BASEDB, DBTYPE >::cursor ( ) [virtual]

Create a cursor object.

Returns:: the return value is the created cursor object.

Note:: Because the object of the return value is allocated by the constructor, it should be released with the delete operator when it is no longer in use.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

void kyotocabinet::PlantDB< BASEDB, DBTYPE >::log	(	const char *	file,
		int32_t	line,
		const char *	func,
		Logger::Kind	kind,
		const char *	message
	)

Write a log message.

Parameters:

file	the file name of the program source code.
line	the line number of the program source code.
func	the function name of the program source code.
kind	the kind of the event. Logger::DEBUG for debugging, Logger::INFO for normal information, Logger::WARN for warning, and Logger::ERROR for fatal error.
message	the supplement message.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_logger	(	Logger *	logger,
		uint32_t	kinds = `Logger::WARN \| Logger::ERROR`
	)		`[virtual]`

Set the internal logger.

Parameters:

logger	the logger object.
kinds	kinds of logged messages by bitwise-or: Logger::DEBUG for debugging, Logger::INFO for normal information, Logger::WARN for warning, and Logger::ERROR for fatal error.

Returns:: true on success, or false on failure.

Implements kyotocabinet::BasicDB.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_meta_trigger ( MetaTrigger * trigger )

Set the internal meta operation trigger.

Parameters:

trigger the trigger object.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_alignment ( int8_t apow )

Set the power of the alignment of record size.

Parameters:

apow	the power of the alignment of record size.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_fbp ( int8_t fpow )

Set the power of the capacity of the free block pool.

Parameters:

fpow	the power of the capacity of the free block pool.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_options ( int8_t opts )

Set the optional features.

Parameters:

opts	the optional features by bitwise-or: BasicDB::TSMALL to use 32-bit addressing, BasicDB::TLINEAR to use linear collision chaining, BasicDB::TCOMPRESS to compress each record.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_buckets ( int64_t bnum )

Set the number of buckets of the hash table.

Parameters:

bnum	the number of buckets of the hash table.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_page ( int32_t psiz )

Set the size of each page.

Parameters:

psiz	the size of each page.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_map ( int64_t msiz )

Set the size of the internal memory-mapped region.

Parameters:

msiz	the size of the internal memory-mapped region.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_defrag ( int64_t dfunit )

Set the unit step number of auto defragmentation.

Parameters:

dfunit the unit step number of auto defragmentation.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_page_cache ( int64_t pccap )

Set the capacity size of the page cache.

Parameters:

pccap the capacity size of the page cache.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_compressor ( Compressor * comp )

Set the data compressor.

Parameters:

comp	the data compressor object.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::tune_comparator ( Comparator * rcomp )

Set the record comparator.

Parameters:

rcomp the record comparator object.

Returns:: true on success, or false on failure.

Note:: Several built-in comparators are provided. LEXICALCOMP for the default lexical comparator. DECIMALCOMP for the decimal comparator. LEXICALDESCCOMP for the lexical descending comparator. DECIMALDESCCOMP for the lexical descending comparator.

template<class BASEDB , uint8_t DBTYPE>

char* kyotocabinet::PlantDB< BASEDB, DBTYPE >::opaque ( )

Get the opaque data.

Returns:: the pointer to the opaque data region, whose size is 16 bytes.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::synchronize_opaque ( )

Synchronize the opaque data.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

bool kyotocabinet::PlantDB< BASEDB, DBTYPE >::defrag ( int64_t step = 0 )

Perform defragmentation of the file.

Parameters:

step	the number of steps. If it is not more than 0, the whole region is defraged.

Returns:: true on success, or false on failure.

template<class BASEDB , uint8_t DBTYPE>

uint8_t kyotocabinet::PlantDB< BASEDB, DBTYPE >::flags ( )

Get the status flags.

Returns:: the status flags, or 0 on failure.

template<class BASEDB , uint8_t DBTYPE>

Comparator* kyotocabinet::PlantDB< BASEDB, DBTYPE >::rcomp ( )

Get the record comparator.

Returns:: the record comparator object.

template<class BASEDB , uint8_t DBTYPE>

void kyotocabinet::PlantDB< BASEDB, DBTYPE >::report	(	const char *	file,
		int32_t	line,
		const char *	func,
		Logger::Kind	kind,
		const char *	format,
			...
	)		`[protected]`

Report a message for debugging.

Parameters:

file	the file name of the program source code.
line	the line number of the program source code.
func	the function name of the program source code.
kind	the kind of the event. Logger::DEBUG for debugging, Logger::INFO for normal information, Logger::WARN for warning, and Logger::ERROR for fatal error.
format	the printf-like format string.
...	used according to the format string.

template<class BASEDB , uint8_t DBTYPE>

void kyotocabinet::PlantDB< BASEDB, DBTYPE >::report_valist	(	const char *	file,
		int32_t	line,
		const char *	func,
		Logger::Kind	kind,
		const char *	format,
		va_list	ap
	)		`[protected]`

Report a message for debugging with variable number of arguments.

Parameters:

file	the file name of the program source code.
line	the line number of the program source code.
func	the function name of the program source code.
kind	the kind of the event. Logger::DEBUG for debugging, Logger::INFO for normal information, Logger::WARN for warning, and Logger::ERROR for fatal error.
format	the printf-like format string.
ap	used according to the format string.

template<class BASEDB , uint8_t DBTYPE>

void kyotocabinet::PlantDB< BASEDB, DBTYPE >::report_binary	(	const char *	file,
		int32_t	line,
		const char *	func,
		Logger::Kind	kind,
		const char *	name,
		const char *	buf,
		size_t	size
	)		`[protected]`

Report the content of a binary buffer for debugging.

Parameters:

file	the file name of the epicenter.
line	the line number of the epicenter.
func	the function name of the program source code.
kind	the kind of the event. Logger::DEBUG for debugging, Logger::INFO for normal information, Logger::WARN for warning, and Logger::ERROR for fatal error.
name	the name of the information.
buf	the binary buffer.
size	the size of the binary buffer

template<class BASEDB , uint8_t DBTYPE>

void kyotocabinet::PlantDB< BASEDB, DBTYPE >::trigger_meta	(	MetaTrigger::Kind	kind,
		const char *	message
	)		`[protected]`

Trigger a meta database operation.

Parameters:

kind the kind of the event. MetaTrigger::OPEN for opening, MetaTrigger::CLOSE for closing, MetaTrigger::CLEAR for clearing, MetaTrigger::ITERATE for iteration, MetaTrigger::SYNCHRONIZE for synchronization, MetaTrigger::BEGINTRAN for beginning transaction, MetaTrigger::COMMITTRAN for committing transaction, MetaTrigger::ABORTTRAN for aborting transaction, and MetaTrigger::MISC for miscellaneous operations.

message the supplement message.

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

template<class BASEDB, uint8_t DBTYPE> class kyotocabinet::PlantDB< BASEDB, DBTYPE >

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

template<class BASEDB, uint8_t DBTYPE>
class kyotocabinet::PlantDB< BASEDB, DBTYPE >