kyotocabinet::CacheDB Class Reference

On-memory hash database with LRU deletion. More...

#include <kccachedb.h>

List of all members.

Classes

class  Cursor
 Cursor to indicate a record. More...
struct  Record
 Record data.
class  Remover
 Removing visitor.
class  Repeater
 Repeating visitor.
class  Setter
 Setting visitor.
struct  Slot
 Slot table.
struct  TranLog
 Transaction log.

Public Member Functions

 CacheDB ()
 Default constructor.
virtual ~CacheDB ()
 Destructor.
virtual bool accept (const char *kbuf, size_t ksiz, Visitor *visitor, bool writable=true)
 Accept a visitor to a record.
virtual bool iterate (Visitor *visitor, bool writable=true)
 Iterate to accept a visitor for each record.
virtual Error error () const
 Get the last happened error.
virtual void set_error (Error::Code code, const char *message)
 Set the error information.
virtual bool open (const std::string &path, uint32_t mode=OWRITER|OCREATE)
 Open a database file.
virtual bool close ()
 Close the database file.
virtual bool synchronize (bool hard=false, FileProcessor *proc=NULL)
 Synchronize updated contents with the file and the device.
virtual bool begin_transaction (bool hard=false)
 Begin transaction.
virtual bool begin_transaction_try (bool hard=false)
 Try to begin transaction.
virtual bool end_transaction (bool commit=true)
 End transaction.
virtual bool clear ()
 Remove all records.
virtual int64_t count ()
 Get the number of records.
virtual int64_t size ()
 Get the size of the database file.
virtual std::string path ()
 Get the path of the database file.
virtual bool status (std::map< std::string, std::string > *strmap)
 Get the miscellaneous status information.
virtual Cursorcursor ()
 Create a cursor object.
virtual bool tune_buckets (int64_t bnum)
 Set the number of buckets of the hash table.
virtual bool cap_count (int64_t count)
 Set the capacity by record number.
virtual bool cap_size (int64_t size)
 Set the capacity by memory usage.

Detailed Description

On-memory hash database with LRU deletion.


Constructor & Destructor Documentation

kyotocabinet::CacheDB::CacheDB (  )  [explicit]

Default constructor.

virtual kyotocabinet::CacheDB::~CacheDB (  )  [virtual]

Destructor.

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

Member Function Documentation

virtual bool kyotocabinet::CacheDB::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.

Implements kyotocabinet::DB.

virtual bool kyotocabinet::CacheDB::iterate ( Visitor visitor,
bool  writable = true 
) [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.
Returns:
true on success, or false on failure.
Note:
the whole iteration is performed atomically and other threads are blocked.

Implements kyotocabinet::DB.

virtual Error kyotocabinet::CacheDB::error (  )  const [virtual]

Get the last happened error.

Returns:
the last happened error.

Implements kyotocabinet::FileDB.

virtual void kyotocabinet::CacheDB::set_error ( Error::Code  code,
const char *  message 
) [virtual]

Set the error information.

Parameters:
code an error code.
message a supplement message.
virtual bool kyotocabinet::CacheDB::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. CacheDB::OWRITER as a writer, CacheDB::OREADER as a reader. The following may be added to the writer mode by bitwise-or: CacheDB::OCREATE, which means it creates a new database if the file does not exist, CacheDB::OTRUNCATE, which means it creates a new database regardless if the file exists, CacheDB::OAUTOTRAN, which means each updating operation is performed in implicit transaction, CacheDB::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: CacheDB::ONOLOCK, which means it opens the database file without file locking, CacheDB::OTRYLOCK, which means locking is performed without blocking, CacheDB::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 CacheDB::close method when it is no longer in use.

Implements kyotocabinet::FileDB.

virtual bool kyotocabinet::CacheDB::close (  )  [virtual]

Close the database file.

Returns:
true on success, or false on failure.

Implements kyotocabinet::FileDB.

virtual bool kyotocabinet::CacheDB::synchronize ( bool  hard = false,
FileProcessor proc = 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.
Returns:
true on success, or false on failure.

Implements kyotocabinet::FileDB.

virtual bool kyotocabinet::CacheDB::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::FileDB.

virtual bool kyotocabinet::CacheDB::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::FileDB.

virtual bool kyotocabinet::CacheDB::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::FileDB.

virtual bool kyotocabinet::CacheDB::clear (  )  [virtual]

Remove all records.

Returns:
true on success, or false on failure.

Implements kyotocabinet::DB.

virtual int64_t kyotocabinet::CacheDB::count (  )  [virtual]

Get the number of records.

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

Implements kyotocabinet::DB.

virtual int64_t kyotocabinet::CacheDB::size (  )  [virtual]

Get the size of the database file.

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

Implements kyotocabinet::FileDB.

virtual std::string kyotocabinet::CacheDB::path (  )  [virtual]

Get the path of the database file.

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

Implements kyotocabinet::FileDB.

virtual bool kyotocabinet::CacheDB::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::FileDB.

virtual Cursor* kyotocabinet::CacheDB::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::FileDB.

virtual bool kyotocabinet::CacheDB::tune_buckets ( int64_t  bnum  )  [virtual]

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.
virtual bool kyotocabinet::CacheDB::cap_count ( int64_t  count  )  [virtual]

Set the capacity by record number.

Parameters:
count the maximum number of records.
Returns:
true on success, or false on failure.
virtual bool kyotocabinet::CacheDB::cap_size ( int64_t  size  )  [virtual]

Set the capacity by memory usage.

Parameters:
size the maximum size of memory usage.
Returns:
true on success, or false on failure.

Generated on Tue Apr 27 21:44:18 2010 for Kyoto Cabinet by  doxygen 1.6.1