com.github.f4b6a3.uuid.nodeid

Class HardwareAddressNodeIdentifierStrategy

java.lang.Object

com.github.f4b6a3.uuid.nodeid.HardwareAddressNodeIdentifierStrategy

All Implemented Interfaces:

NodeIdentifierStrategy

public class HardwareAddressNodeIdentifierStrategy
extends Object
implements NodeIdentifierStrategy

Field Summary

Fields

Modifier and Type	Field and Description
protected long	nodeIdentifier

Constructor Summary

Constructors

Constructor and Description
HardwareAddressNodeIdentifierStrategy()

Method Summary

Modifier and Type	Method and Description
protected long	getHardwareAddress() getNodeIdentifier()
long	getNodeIdentifier() Get the machine address.
protected long	getRandomMulticastNodeIdentifier() Return a random generated node identifier.

Methods inherited from class java.lang.Object

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

Field Detail

nodeIdentifier

protected long nodeIdentifier

Constructor Detail

HardwareAddressNodeIdentifierStrategy

public HardwareAddressNodeIdentifierStrategy()

Method Detail

getNodeIdentifier

public long getNodeIdentifier()

Get the machine address. It returns the first MAC that can be found. First it tries to find the MAC that is associated with the host name. Otherwise, it tries to find the first MAC that is up and running. This second try may be very expensive on Windows, because it iterates over a lot of virtual network interfaces created by the operating system. If no MAC is found, a random node identifier is returned. ### RFC-4122 - 4.1.6. Node (1) For UUID version 1, the node field consists of an IEEE 802 MAC address, usually the host address. For systems with multiple IEEE 802 addresses, any available one can be used. The lowest addressed octet (octet number 10) contains the global/local bit and the unicast/multicast bit, and is the first octet of the address transmitted on an 802.3 LAN. (2) For systems with no IEEE address, a randomly or pseudo-randomly generated value may be used; see Section 4.5. The multicast bit must be set in such addresses, in order that they will never conflict with addresses obtained from network cards.

Specified by:

getNodeIdentifier in interface NodeIdentifierStrategy

Returns:

a node identifier

getHardwareAddress

protected long getHardwareAddress()

getNodeIdentifier()

Returns:

a hardware address

getRandomMulticastNodeIdentifier

protected long getRandomMulticastNodeIdentifier()

Return a random generated node identifier. getNodeIdentifier()

Returns:

a random multicast node identifier