io.werval.util

Class UUIDIdentityGenerator

java.lang.Object

io.werval.util.UUIDIdentityGenerator

All Implemented Interfaces:

IdentityGenerator

public final class UUIDIdentityGenerator
extends Object
implements IdentityGenerator

UUID based IdentityGenerator.

Generated identities have the following form: (PREFIX_)UUID_COUNT.

PREFIX is optional, see UUIDIdentityGenerator(java.lang.String) and UUIDIdentityGenerator(java.lang.String, int).

COUNT can be left-padded with zeroes, see UUIDIdentityGenerator(int) and UUIDIdentityGenerator(java.lang.String, int).

Each instance holds a UUID and an AtomicLong based counter. Identities are generated by concatenating the UUID and the counter. The later is incremented along the way.

Constructor Summary

Constructors

Constructor and Description
UUIDIdentityGenerator()
UUIDIdentityGenerator(int countLength) Use this constructor to left-pad counter with zeroes.
UUIDIdentityGenerator(String prefix) Use this constructor to prefix the identities.
UUIDIdentityGenerator(String prefix, int countLength) Use this constructor to prefix the identities and left-pad the counter with zeroes.

Method Summary

Modifier and Type	Method and Description
String	newIdentity() Generate a new identity.
void	reset() Reset the identity UUID & counter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UUIDIdentityGenerator

public UUIDIdentityGenerator()

UUIDIdentityGenerator

public UUIDIdentityGenerator(int countLength)

Use this constructor to left-pad counter with zeroes.

Parameters:

countLength - Length of the COUNT part of the generated identities. A negative value disable padding.

UUIDIdentityGenerator

public UUIDIdentityGenerator(String prefix)

Use this constructor to prefix the identities.

Parameters:

prefix - String to prepend to all generated identities

UUIDIdentityGenerator

public UUIDIdentityGenerator(String prefix,
                             int countLength)

Use this constructor to prefix the identities and left-pad the counter with zeroes.

Parameters:

prefix - String to prepend to all generated identities

countLength - Length of the COUNT part of the generated identities. A negative value disable padding.

Method Detail

newIdentity

public String newIdentity()

Description copied from interface: IdentityGenerator

Generate a new identity.

Specified by:

newIdentity in interface IdentityGenerator

Returns:

The new identity as String

reset

public void reset()

Reset the identity UUID & counter.