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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jsqlbox Show documentation

jSqlBox is a full function DAO tool

There is a newer version: 5.0.15.jre8

/*
 * Copyright 2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
 * applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
 * OF ANY KIND, either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */
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 {
}