snowflake

based on twitter snowflake, changed a little.

changes

• class -> enum: simplest singleton ThreadSafe

• node id Configurable:

  instance(Integer.parseInt(System.getProperty("instance.id")));

  VM options: -Dinstance.id=1 (1~1023, according to your situation)

  Of course, u can write directly in the code:

  instance(1); // 1~1023

How to use

So Easy: Long id = IdWorker.instance.getId();

see Test