javasnowflake
Java implementation of twitter snowflake. 64 bit sequential ID generator based on twitter snowflake ID generation algorithm. id is composed of: time - 41 bits (millisecond precision w/ a custom epoch gives us 69 years); configured machine id - 10 bits - 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).