Java's serial number generator

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How to use Java to generate serial numbers while supporting configurable and high concurrency???

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Suppose your project has integrated the caching technology
If you have a certain Java foundation
If......

The following code implements a high-concurrency, configurable, high-efficiency serial number generator, can be used for multiple modules of a project, the serial number supports caching, that is, each time a certain number of pre-generated serial number stored in the cache, when needed, priority to the cache , after the sequence number in the cache is used, regenerate a certain number of serial numbers into the cache, so loop, improve efficiency ...
At the same time, the serial number generator is thread-safe , protected with the thread lock, and has been really put into use in the project ...

database table Design

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")

Description

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: The current serial number template only supports letters, dynamic numbers (0000 for 1-9999), and dates in combination with ${date}
Is_auto_increment is configured to 1, the serial number generated by the configuration template for CX000000 is: CX1, cx2,cx3 .....
Configured to 0, the serial number generated by the configuration template for CX0000000 is: cx00000001,cx00000002,cx00000003

Database Configuration Note: If you need a project number for the project module, you need to configure a record in the database table Sys_serial_number:

|  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} generates a sequence number similar to: CX0000000120160522, cx0000000220160522,cx0000000320160522 ...

Serial Number model entity design:

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;/** * Function Description: Serial number Table model * * @author: Ay 2015/11/23 */@ Entity@table (name= "Sys_serial_number") public class Systemserialnumber extends Basemodel {/** * module name */@Col    Umn (name = "Module_name", columndefinition = "VARCHAR") private String modulename;    /** * Module Code */@Column (name = "Module_code", columndefinition = "VARCHAR") private String Modulecode; /** * Serial Number configuration template */@Column (name = "Config_templet", columndefinition = "VARCHAR") Private String Configtemplet    ;    /** * The maximum value of the serial number */@Column (name = "Max_serial", columndefinition = "VARCHAR") private String maxserial; /** * Whether the automatic growth indicator */@Column (name = "Is_auto_increment", columndefinition = "VARCHAR") Private String Isautoinc    Rement;   Public String getisautoincrement () {return isautoincrement; } public void Setisautoincrement (String isautoincrement) {this.isautoincrement = isautoincrement;     }/** * Pre-generated number of serial number */@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:

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 implementations:

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 fi nal Logger Logger = Loggerfactory.getlogger (SeRialnumberserviceimpl.class);    @Autowired private Serialnumberdao Serialnumberdao;    @Autowired private Serialnumberrepository serialnumberrepository;    /** format */private String pattern = "";    /** Generator Lock */private final reentrantlock lock = new Reentrantlock ();    /** Serial Number Formatter */private DecimalFormat format = null;    /** pre-generated lock */private final Reentrantlock Preparelock = new Reentrantlock ();    /** minimum */private int min = 0;    /** Maximum */private long max = 0;    /** has generated a serial number (SEED) */private long seed = min;    /** pre-generated quantity */private int prepare = 0;    /** the current maximum sequence number stored by the database **/long maxserialint = 0;    /** whether the current serial number is a single-digit auto-increment mode **/private String isautoincrement = "0";    Systemserialnumberdto systemserialnumberdto = new Systemserialnumberdto ();    /** pre-generated serial number */hashmap<string,list<string>> Prepareserialnumbermap = new hashmap<> (); /** * Query single serial number configuration information * @param systemserialnumberdto * @return */@Override publicSystemserialnumberdto Find (Systemserialnumberdto systemserialnumberdto) {return Serialnumberdao.find (SystemSerialN    UMBERDTO); }/** * Generates a pre-number sequence number based on module code into map * @param modulecode Module Code * @return */@CachePut (value = "Serialnu        Mber ", key=" #moduleCode ") public list<string> generateprepareserialnumbers (String modulecode) {//Temp List variable        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{//If the dynamic number length is greater than the length example in the template: Template CF000 maxserialint-Maxseriali                    NT = 0;                    Update data, reset Maxserialint to 0 systemserialnumberdto.setmaxserial ("0"); Systemserialnumber SystemserialnuMber = new Systemserialnumber ();                    Beanutils.copyproperties (systemserialnumber,systemserialnumberdto);                Serialnumberrepository.save (Systemserialnumber);                }//Dynamic number generation String Formatserialnum = Format.format (seed); Generation of dynamic dates if (Pattern.contains (Serialnumconstants.date_symbol)) {String currentdate = Dat                    Eutils.format (New Date (), "yyyyMMdd");                Formatserialnum = Formatserialnum.replace (serialnumconstants.date_symbol,currentdate);            } resultlist.add (Formatserialnum);            }//Update data systemserialnumberdto.setmaxserial (Maxserialint + "");            Systemserialnumber systemserialnumber = new Systemserialnumber ();            Beanutils.copyproperties (systemserialnumber,systemserialnumberdto);        Serialnumberrepository.save (Systemserialnumber);       }finally{Lock.unlock (); } return resultlist; }/** * Generates serial number according to module code * @param modulecode module code * @return Serial Number */public String Generateserialnumb        Erbymodelcode (String modulecode) {//Pre-serial number plus lock Preparelock.lock (); try{//Determine if there is a serial number in memory if (null! = Prepareserialnumbermap.get (modulecode) && Prepareserialnumber Map.get (Modulecode). Size () > 0) {//if any, return to the first, and remove the return Prepareserialnumbermap.get (Modulec            ODE). Remove (0);        }}finally {//Pre-serial number unlocked preparelock.unlock ();        } systemserialnumberdto = new Systemserialnumberdto ();        Systemserialnumberdto.setmodulecode (Modulecode);        Systemserialnumberdto = Serialnumberdao.find (systemserialnumberdto); Prepare = Integer.parseint (Systemserialnumberdto.getpremaxnum (). Trim ());//pre-generated serial number number pattern = Systemserialnumberdto. Getconfigtemplet (). Trim ();//configuration template String maxserial = Systemserialnumberdto.getmaxsErial (). Trim ();        Stores the current maximum value isautoincrement = Systemserialnumberdto.getisautoincrement (). Trim (); Maxserialint = Long.parselong (Maxserial.trim ());//The maximum serial number stored by the database max = This.counter (pattern, ' 0 ') + 1;//determines the number of current serial numbers according to the template        The large value if (Isautoincrement.equals ("1")) {pattern = Pattern.replace ("0", "#");        } format = new DecimalFormat (pattern);        Generate a pre-sequence number, save in cache list<string> resultlist = generateprepareserialnumbers (Modulecode);        Preparelock.lock ();            try {prepareserialnumbermap.put (Modulecode, resultlist);        Return Prepareserialnumbermap.get (Modulecode). Remove (0);        } finally {Preparelock.unlock (); }}/** * Set minimum value * * @param value Minimum, required: greater than or equal to zero * @return Serial number Generator instance */Public Iserialnumservice        Setmin (int value) {lock.lock ();        try {this.min = value;        }finally {lock.unlock ();    } return this;     }    /*** Maximum Value * * @param value maximum, required: less than or equal to Long.max_value (9223372036854775807) * @return Serial Number Generator instance */Public I        Serialnumservice Setmax (Long value) {Lock.lock ();        try {This.max = value;        }finally {lock.unlock ();    } return this; }/** * Set number of pre-generated serial number * @param count pre-build quantity * @return Serial number Generator instance */Public Iserialnumservice Setprepa        Re (int count) {lock.lock ();        try {this.prepare = count;        }finally {lock.unlock ();    } return this; }/** * Counts the number of occurrences of a character * @param the character that Str looks for * @param c * @return */private int counter (String str,c        Har c) {int count=0;            for (int i = 0;i < Str.length (); i++) {if (Str.charat (i) ==c) {count++;    }} return count; }}

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Java's serial number generator