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Updated README.md

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Fabio Lima 2020-02-24 04:53:01 -03:00
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README.md
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# ulid-creator
# ULID Creator
A Java library for generating and handling ULIDs - _Universally Unique Lexicographically Sortable Identifiers_.
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### GUID
The GUIDs in this library are based on the ULID specification <sup>[9]</sup>. The first 48 bits represent the count of milliseconds since Unix Epoch, 1 January 1970. The remaining 60 bits are generated by a secure random number generator.
The GUIDs in this library are based on the [ULID specification](https://github.com/ulid/spec). The first 48 bits represent the count of milliseconds since Unix Epoch, 1 January 1970. The remaining 60 bits are generated by a secure random number generator.
Every time the timestamp changes the random part is reset to a new random value. If the current timestamp is equal to the previous one, the random bits are incremented by 1.

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src/main/java/com/github/f4b6a3/ulid/guid/GuidCreator.java
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/**
* Increment the random part of the GUID.
*
* An exception is thrown when more than 2^80 increment operations are made.
* An exception is thrown when more than 2^80 increment operations are made
* in the same millisecond.
*
* @throws UlidCreatorException
* if an overrun happens.