com.github.f4b6a3.uuid.util

Class FingerprintUtil

java.lang.Object

com.github.f4b6a3.uuid.util.FingerprintUtil

public class FingerprintUtil
extends Object

Method Summary

Modifier and Type	Method and Description
static long	getFingerprint() Returns a host fingerprint calculated from a list of system properties: OS + JVM + network details + system resources.
protected static String	getJavaVirtualMachine() Returns a string of the JVM details.
protected static String	getNetwork() Returns a string of the network details.
protected static String	getOperatingSystem() Returns a string of the OS details.
protected static String	getResources() Returns a string of CPU cores and maximum memory available.
protected static String	getSystemDataHash() Returns a hash string generated from all the system data: OS + JVM + network details + system resources.

Methods inherited from class java.lang.Object

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

Method Detail

getFingerprint

public static long getFingerprint()

Returns a host fingerprint calculated from a list of system properties: OS + JVM + network details + system resources. It uses these information to generate the node identifier: operating system, java virtual machine, network details and system resources. These information are concatenated and passed to a message digest. It returns the last six bytes of the resulting hash. ### RFC-4122 - 4.5. Node IDs that Do Not Identify the Host This section describes how to generate a version 1 UUID if an IEEE 802 address is not available, or its use is not desired. In addition, items such as the computer's name and the name of the operating system, while not strictly speaking random, will help differentiate the results from those obtained by other systems. The exact algorithm to generate a node ID using these data is system specific, because both the data available and the functions to obtain them are often very system specific. A generic approach, however, is to accumulate as many sources as possible into a buffer, use a message digest such as MD5 [4] or SHA-1 [8], take an arbitrary 6 bytes from the hash value, and set the multicast bit as described above. Read: https://en.wikipedia.org/wiki/Device_fingerprint

Returns:

a system identifier

getSystemDataHash

protected static String getSystemDataHash()

Returns a hash string generated from all the system data: OS + JVM + network details + system resources.

Returns:

a string

getOperatingSystem

protected static String getOperatingSystem()

Returns a string of the OS details.

Returns:

a string

getJavaVirtualMachine

protected static String getJavaVirtualMachine()

Returns a string of the JVM details.

Returns:

a string

getResources

protected static String getResources()

Returns a string of CPU cores and maximum memory available.

Returns:

a string

getNetwork

protected static String getNetwork()

Returns a string of the network details. It's done in three two steps: 1. it tries to find the network data associated with the host name; 2. otherwise, it iterates throw all interfaces to return the first one that is up and running.

Returns:

a string