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• Snowflake.java

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com.github.drinkjava2.jdialects.annotation.jdia.Snowflake Maven / Gradle / Ivy

package com.github.drinkjava2.jdialects.annotation.jdia;

import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.FIELD;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * Mark a Long type column value build by using SnowFlake algorithm from twitter
 * 

 * 
 * In jDialects SnowFlake algorithm source code originated from:
 * https://github.com/downgoon/snowflake
 * 
 * The SnowFlake algorithm follows below basic rule:

 * 1 bit const=0 

 * 41 bits Timestamp based on machine

 * 10 bits Confighured by user, used as machine ID, an example is assign 5 bits
 * for dataCenterID + 5 bits for workerID

 * 12 bits Sequence number

 * 
 * 
 */
@Target(FIELD)
@Retention(RUNTIME)
public @interface Snowflake {
}