Java serial number generator

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How to use jAVA to generate serial numbers while supporting configurability and high concurrency???

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Assume that your project has integrated caching technology

If you have a certain Java foundation

If...

The following code implements a serial number generator that supports high concurrency, configurability, and high efficiency. For use by multiple modules of a project at the same time, serial numbers support caching, that is, a certain number of serial numbers will be pre-generated and stored in the cache each time. When needed, they will be sent to the cache first. After the serial numbers in the cache are used, Regenerate a certain number of serial numbers and put them in the cache, and cycle like this to improve efficiency...

At the same time, the serial number generator is thread-safe and protected by thread locks. It has been truly invested in the project. Use...

Database table design

[code]CREATE TABLE sys_serial_number2 (
    "id" varchar(32) COLLATE "default" NOT NULL,
    "module_name" varchar(50) COLLATE "default",
    "module_code" varchar(50) COLLATE "default",
    "config_templet" varchar(50) COLLATE "default",
    "max_serial" varchar(32) COLLATE "default",
    "pre_max_num" varchar(32) COLLATE "default",
    "is_auto_increment" char(1) COLLATE "default"
)

Instructions:

[code]module_name:模块名称
module_code:模块编码
config_templet:当前模块 使用的序列号模板
max_serial:存放当前序列号的值
pre_max_num：预生成序列号存放到缓存的个数
is_auto_increment:是否自动增长模式，0：否  1：是

Note: Currently the serial number template only supports letters, dynamic numbers (0000 represents 1-9999), and dates Use the combination form of ${DATE}

is_auto_increment is configured as 1, then the serial number generated by the configuration template for CX000000 is: CX1, CX2, CX3...

is configured as 0, this The serial numbers generated when the configuration template is CX0000000 are: CX00000001, CX00000002, CX00000003

Database configuration instructions: If you need the project number of the project module, you need to configure a record in the database table sys_serial_number:

[code]|  id   |  module_name |  module_code |  config_templet | max_serial  | pre_max_num |  is_auto_increment
|-------|--------------|--------------|-----------------|-------------|-------------|--------------------/
|  xxxx |  项目         |  PJ         |CX00000000${DATE}|  2650       |  100        |    1

CX00000000${DATE} The generated serial number is similar to: CX0000000120160522, CX0000000220160522, CX0000000320160522...

Serial number model entity design:

[code]package com.evada.de.serialnum.model;

import com.evada.de.common.model.BaseModel;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;

/**
 * 功能描述:序列号表模型
 *
 * @author :Ay 2015/11/23
 */
@Entity
@Table(name="sys_serial_number")
public class SystemSerialNumber extends BaseModel {

    /**
     * 模块名称
     */
    @Column(name = "module_name", columnDefinition = "VARCHAR")
    private String moduleName;

    /**
     * 模块编码
     */
    @Column(name = "module_code", columnDefinition = "VARCHAR")
    private String moduleCode;

    /**
     * 流水号配置模板
     */
    @Column(name = "config_templet", columnDefinition = "VARCHAR")
    private String configTemplet;

    /**
     * 序列号最大值
     */
    @Column(name = "max_serial", columnDefinition = "VARCHAR")
    private String maxSerial;

    /**
     * 是否自动增长标示
     */
    @Column(name = "is_auto_increment", columnDefinition = "VARCHAR")
    private String isAutoIncrement;

    public String getIsAutoIncrement() {
        return isAutoIncrement;
    }

    public void setIsAutoIncrement(String isAutoIncrement) {
        this.isAutoIncrement = isAutoIncrement;
    }

    /**
     * 预生成流水号数量
     */
    @Column(name = "pre_max_num", columnDefinition = "VARCHAR")
    private String preMaxNum;

    public String getPreMaxNum() {
        return preMaxNum;
    }

    public void setPreMaxNum(String preMaxNum) {
        this.preMaxNum = preMaxNum;
    }

    public String getModuleName() {
        return moduleName;
    }

    public void setModuleName(String moduleName) {
        this.moduleName = moduleName;
    }

    public String getModuleCode() {
        return moduleCode;
    }

    public void setModuleCode(String moduleCode) {
        this.moduleCode = moduleCode;
    }

    public String getConfigTemplet() {
        return configTemplet;
    }

    public void setConfigTemplet(String configTemplet) {
        this.configTemplet = configTemplet;
    }

    public String getMaxSerial() {
        return maxSerial;
    }

    public void setMaxSerial(String maxSerial) {
        this.maxSerial = maxSerial;
    }

    public SystemSerialNumber(String id){
        this.id = id;
    }

    public  SystemSerialNumber(String id,String moduleCode){
        this.id = id;
        this.moduleCode = moduleCode;
    }

    public SystemSerialNumber(){}
}

Service interface design:

[code]package com.evada.de.serialnum.service;

import com.evada.de.serialnum.dto.SystemSerialNumberDTO;

/**
 * 序列号service接口
 * Created by huangwy on 2015/11/24.
 */
public interface ISerialNumService {

    public SystemSerialNumberDTO find(SystemSerialNumberDTO systemSerialNumberDTO);

    public String generateSerialNumberByModelCode(String moduleCode);

    /**
     * 设置最小值
     * @param value 最小值，要求：大于等于零
     * @return      流水号生成器实例
     */
    ISerialNumService setMin(int value);

    /**
     * 设置最大值
     * @param value 最大值，要求：小于等于Long.MAX_VALUE ( 9223372036854775807 )
     * @return      流水号生成器实例
     */
    ISerialNumService setMax(long value);

    /**
     * 设置预生成流水号数量
     * @param count 预生成数量
     * @return      流水号生成器实例
     */
    ISerialNumService setPrepare(int count);
}

Service implementation:

[code]package com.evada.de.serialnum.service.impl;

import com.evada.de.common.constants.SerialNumConstants;
import com.evada.de.serialnum.dto.SystemSerialNumberDTO;
import com.evada.de.serialnum.model.SystemSerialNumber;
import com.evada.de.serialnum.repository.SerialNumberRepository;
import com.evada.de.serialnum.repository.mybatis.SerialNumberDAO;
import com.evada.de.serialnum.service.ISerialNumService;
import com.evada.inno.common.util.BeanUtils;
import com.evada.inno.common.util.DateUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CachePut;
import org.springframework.stereotype.Service;
import java.text.DecimalFormat;
import java.util.*;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Created by Ay on 2015/11/24.
 */
@Service("serialNumberService")
public class SerialNumberServiceImpl implements ISerialNumService {

    private static final Logger LOGGER = LoggerFactory.getLogger(SerialNumberServiceImpl.class);

    @Autowired
    private SerialNumberDAO serialNumberDAO;

    @Autowired
    private SerialNumberRepository serialNumberRepository;

    /** 格式 */
    private String pattern = "";

    /** 生成器锁 */
    private final ReentrantLock lock = new ReentrantLock();

    /** 流水号格式化器 */
    private DecimalFormat format = null;

    /** 预生成锁 */
    private final ReentrantLock prepareLock = new ReentrantLock();

    /** 最小值 */
    private int min = 0;

    /** 最大值 */
    private long max = 0;

    /** 已生成流水号（种子） */
    private long seed = min;

    /** 预生成数量 */
    private int prepare = 0;

    /** 数据库存储的当前最大序列号 **/
    long maxSerialInt = 0;

    /** 当前序列号是否为个位数自增的模式 **/
    private String isAutoIncrement = "0";

    SystemSerialNumberDTO systemSerialNumberDTO =  new SystemSerialNumberDTO();

    /** 预生成流水号 */
    HashMap<String,List<String>> prepareSerialNumberMap = new HashMap<>();

    /**
     * 查询单条序列号配置信息
     * @param systemSerialNumberDTO
     * @return
     */
    @Override
    public SystemSerialNumberDTO find(SystemSerialNumberDTO systemSerialNumberDTO) {
        return serialNumberDAO.find(systemSerialNumberDTO);
    }

    /**
     * 根据模块code生成预数量的序列号存放到Map中
     * @param moduleCode 模块code
     * @return
     */
    @CachePut(value = "serialNumber",key="#moduleCode")
    public List<String> generatePrepareSerialNumbers(String moduleCode){
        //临时List变量
        List<String> resultList = new ArrayList<String>(prepare);
        lock.lock();
        try{
            for(int i=0;i<prepare;i++){
                maxSerialInt  = maxSerialInt + 1;
                if(maxSerialInt > min && (maxSerialInt + "").length() < max ){
                    seed = maxSerialInt ;
                }else{
                    //如果动态数字长度大于模板中的长度 例：模板CF000  maxSerialInt 1000
                    seed = maxSerialInt = 0;
                    //更新数据，重置maxSerialInt为0
                    systemSerialNumberDTO.setMaxSerial("0");
                    SystemSerialNumber systemSerialNumber = new SystemSerialNumber();
                    BeanUtils.copyProperties(systemSerialNumber,systemSerialNumberDTO);
                    serialNumberRepository.save(systemSerialNumber);
                }
                 //动态数字生成
                 String formatSerialNum = format.format(seed);

                //动态日期的生成
                if(pattern.contains(SerialNumConstants.DATE_SYMBOL)){
                    String currentDate = DateUtils.format(new Date(),"yyyyMMdd");
                    formatSerialNum = formatSerialNum.replace(SerialNumConstants.DATE_SYMBOL,currentDate);
                }

                resultList.add(formatSerialNum);
            }
            //更新数据
            systemSerialNumberDTO.setMaxSerial(maxSerialInt + "");
            SystemSerialNumber systemSerialNumber = new SystemSerialNumber();
            BeanUtils.copyProperties(systemSerialNumber,systemSerialNumberDTO);
            serialNumberRepository.save(systemSerialNumber);
        }finally{
            lock.unlock();
        }
        return resultList;
    }

    /**
     * 根据模块code生成序列号
     * @param moduleCode  模块code
     * @return  序列号
     */
    public String generateSerialNumberByModelCode(String moduleCode){

        //预序列号加锁
        prepareLock.lock();
        try{
            //判断内存中是否还有序列号
            if(null != prepareSerialNumberMap.get(moduleCode) && prepareSerialNumberMap.get(moduleCode).size() > 0){
                //若有，返回第一个，并删除
                return prepareSerialNumberMap.get(moduleCode).remove(0);
            }
        }finally {
            //预序列号解锁
            prepareLock.unlock();
        }
        systemSerialNumberDTO = new SystemSerialNumberDTO();
        systemSerialNumberDTO.setModuleCode(moduleCode);
        systemSerialNumberDTO = serialNumberDAO.find(systemSerialNumberDTO);
        prepare = Integer.parseInt(systemSerialNumberDTO.getPreMaxNum().trim());//预生成流水号数量
        pattern = systemSerialNumberDTO.getConfigTemplet().trim();//配置模板
        String maxSerial = systemSerialNumberDTO.getMaxSerial().trim(); //存储当前最大值
        isAutoIncrement = systemSerialNumberDTO.getIsAutoIncrement().trim();
        maxSerialInt = Long.parseLong(maxSerial.trim());//数据库存储的最大序列号
        max = this.counter(pattern,&#39;0&#39;) + 1;//根据模板判断当前序列号数字的最大值
        if(isAutoIncrement.equals("1")){
            pattern = pattern.replace("0","#");
        }
        format = new DecimalFormat(pattern);
        //生成预序列号，存到缓存中
        List<String> resultList = generatePrepareSerialNumbers(moduleCode);
        prepareLock.lock();
        try {
            prepareSerialNumberMap.put(moduleCode, resultList);
            return prepareSerialNumberMap.get(moduleCode).remove(0);
        } finally {
            prepareLock.unlock();
        }
    }

    /**
     * 设置最小值
     *
     * @param value 最小值，要求：大于等于零
     * @return 流水号生成器实例
     */
    public ISerialNumService setMin(int value) {
        lock.lock();
        try {
            this.min = value;
        }finally {
            lock.unlock();
        }
        return this;
    }

    /**
     * 最大值
     *
     * @param value 最大值，要求：小于等于Long.MAX_VALUE ( 9223372036854775807 )
     * @return 流水号生成器实例
     */
    public ISerialNumService setMax(long value) {
        lock.lock();
        try {
            this.max = value;
        }finally {
            lock.unlock();
        }
        return this;
    }

    /**
     * 设置预生成流水号数量
     * @param count 预生成数量
     * @return      流水号生成器实例
     */
    public ISerialNumService setPrepare(int count) {
        lock.lock();
        try {
            this.prepare = count;
        }finally {
            lock.unlock();
        }
        return this;
    }

    /**
     * 统计某一个字符出现的次数
     * @param str 查找的字符
     * @param c
     * @return
     */
    private int counter(String str,char c){
        int count=0;
        for(int i = 0;i < str.length();i++){
            if(str.charAt(i)==c){
                count++;
            }
        }
        return count;
    }

}

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