| This generator uses a Java implementation of DCE UUIDs to create unique
identifiers without the overhead of additional database transactions or even
an open database connection. The identifiers are Strings of the form
"LLLLLLLL-MMMM-HHHH-CCCC-NNNNNNNNNNNN" where 'L', 'M', 'H', 'C' and 'N' are
the DCE UUID fields named time low, time mid, time high, clock sequence and
node.
This generator can be used in concurrent applications. It is especially
useful in situations where large numbers of transactions within a certain
amount of time have to be made, and the additional overhead of synchronizing
the concurrent creation of unique identifiers through the database would
break performance limits.
There are no properties for this PoidGenerator.
Note: Due to limitations of the available Java API there is a chance of less
than 1:2^62 that two concurrently running JVMs will produce the same
identifiers, which is in practical terms never, because your database server
will have crashed a million times before this happens.
version:
$Revision: 1.4 $ |
