Provides buffered storage (delayed write-back) of objects with a drwnPersistentRecord interface. More...

Public Member Functions
	drwnPersistentStorageBuffer (const char *fileStem, bool bCompressed=false)

size_t	size () const
	returns number of records in the buffer

size_t	memory () const
	returns memory used by in-memory records

const drwnPersistentStorage &	storage () const
	returns a reference to the storage object

drwnSmartPointer< T >	read (const string &key)
	returns a record from the in-memory buffer or disk storage

void	write (const string &key, drwnSmartPointer< T > &p)
	writes a record to storage (the write is delayed until the record is removed from memory or flush is called)

void	erase (const string &key)
	erases a record from storage (and memory)

void	flush ()
	write all pending records to disk

Static Public Attributes
static size_t	MAX_MEMORY = 1.0e9
	maximum number of bytes stored

static size_t	MAX_RECORDS = 1000
	maximum number of records stored

Protected Types
typedef list< _drwnRecordEntry >	_drwnRecordList

typedef map< string, typename _drwnRecordList::iterator >	_drwnRecordRef

Protected Member Functions
void	enforceLimits ()
	checks memory and count limits, writes and frees pending records if exceeded

Protected Attributes
drwnPersistentStorage	_storage
	storage object

_drwnRecordRef	_recref
	reference to records

_drwnRecordList	_records
	cached records (in most-recently-used order)

size_t	_memoryUsed
	current memory usage

Detailed Description

Provides buffered storage (delayed write-back) of objects with a drwnPersistentRecord interface.

Records are removed in least-recently-used order.

Warning: The API for this class may change in future versions.; The class is not thread-safe.

The documentation for this class was generated from the following file:

Classes