org.brains2b.data
Interface OptimisticLock

All Known Implementing Classes:

CursorData

public interface OptimisticLock

Interface that defines the methods used for optimistic locking.

Classes that use this interface should define a valid hashcode and a mutable member in which the hashcode can be set to a checksum.

Note:When calculating a hashcode for a dataobject that uses a ROWIDas primary key, be sure never to include the ROWID in het hascode calculation.

Version:

0.1 [31-03-2003]

Author:

dennis@brains2b.nl

Method Summary

int	getChecksum() get the checksum value
int	hashCode() get a hash for the particular object that implements this interface.
void	setChecksum(int value) set the checksum value.

Method Detail

getChecksum

public int getChecksum()

get the checksum value

Returns:

int, the checksum value

setChecksum

public void setChecksum(int value)

set the checksum value. Usually just a newly calculated hashCode()

Parameters:

value - int, the new checksum value

hashCode

public int hashCode()

get a hash for the particular object that implements this interface.

Here to remind you: You cannot rely on Object.hashCode() to implement a meaningfull OptimisticLock

Overrides:

hashCode in class java.lang.Object

Returns:

int

See Also:

Object.hashCode()