io.mats3.util

Class RandomString

java.lang.Object

io.mats3.util.RandomString

public class RandomString
extends java.lang.Object

If you need a random string for a part of the traceId (Read NOTE about traceIds!), use this class instead of UUID, because UUID has low entropy density with only 4 bits per character, and dashes.

Constructor Summary

Constructors

Constructor and Description
RandomString()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	partTraceId()
static java.lang.String	randomCorrelationId() According to the internet, there are ~7.5e18 grains of sand on all the beaches on earth.
static java.lang.String	randomString(int length)

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomString

public RandomString()

Method Detail

randomCorrelationId

public static java.lang.String randomCorrelationId()

According to the internet, there are ~7.5e18 grains of sand on all the beaches on earth. There are 62 points in the alphabet used to create these random strings. 62^20 is 7.0e35. There is slightly more room in a random UUID, but I felt this was adequate.

Returns:

a 20-char length string, which should be plenty enough uniqueness for pretty much anything - you'll have to make extremely many such strings to get a collision.

partTraceId

public static java.lang.String partTraceId()

Returns:

a 6-char length string, which should be enough to make an already-very-unique TraceId become unique enough to be pretty sure that you will not ever have problems uniquely identifying log lines for a call flow.

randomString

public static java.lang.String randomString(int length)

Parameters:

length - the desired length of the returned random string.

Returns:

a random string of the specified length.