Snowflake

A Java program for generating unique ID numbers based on Twitter's Snowflake

ID is composed of:

• time - 41 bits (millisecond precision w/ a custom epoch gives us 69 years)
• configured machine id - 10 bits (5 bits datacenterId + 5 bits workerId) - gives us up to 1024 machines
• sequence number - 12 bits - rolls over every 4096 per machine (with protection to avoid rollover in the same ms)

Usage

IdGenerator.getInstance().generateId();