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package com.myredistest;

import java.util.Random;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import redis.clients.jedis.Jedis;

/**

 * redis

 *

 * @author 10255_000

 *

 */

public class MyRedistest {

            final String watchkeys = "watchkeys";

            ExecutorService executor = Executors.newFixedThreadPool(20);  //20個執行緒池併發數

            final Jedis jedis = new Jedis("192.168.56.101", 6379);

            jedis.set(watchkeys, "100");//設定起始的搶購數

           // jedis.del("setsucc", "setfail");

            jedis.close();

            for (int i = 0; i < 1000; i++) {//設定1000個人來發起搶購

                executor.execute(new MyRunnable("user"+getRandomString(6)));

            }

            executor.shutdown();

        }

     public static String getRandomString(int length) { //length是隨機字串長度

            String base = "abcdefghijklmnopqrstuvwxyz0123456789";  

            Random random = new Random();  

            StringBuffer sb = new StringBuffer();  

            for (int i = 0; i < length; i++) {  

                int number = random.nextInt(base.length());  

                sb.append(base.charAt(number));  

            }  

            return sb.toString();  

         } 

}

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package com.myredistest;

import java.util.List;

import redis.clients.jedis.Jedis;

import redis.clients.jedis.Transaction;

public class MyRunnable implements Runnable {

    String watchkeys = "watchkeys";// 監視keys

    Jedis jedis = new Jedis("192.168.56.101", 6379);

    String userinfo;

    public MyRunnable() {

    }

    public MyRunnable(String uinfo) {

        this.userinfo=uinfo;

    }

    @Override

    public void run() {

        try {

            jedis.watch(watchkeys);// watchkeys

            String val = jedis.get(watchkeys);

            int valint = Integer.valueOf(val);

            if (valint <= 100 && valint>=1) {

                 Transaction tx = jedis.multi();// 開啟事務

               // tx.incr("watchkeys");

                tx.incrBy("watchkeys", -1);

                List<Object> list = tx.exec();// 提交事務，如果此時watchkeys被改動了，則返回null

                if (list == null ||list.size()==0) {

                    String failuserifo = "fail"+userinfo;

                    String failinfo="使用者：" + failuserifo + "商品爭搶失敗，搶購失敗";

                    System.out.println(failinfo);

                    /* 搶購失敗業務邏輯 */

                    jedis.setnx(failuserifo, failinfo);

                } else {

                    for(Object succ : list){

                         String succuserifo ="succ"+succ.toString() +userinfo ;

                         String succinfo="使用者：" + succuserifo + "搶購成功，當前搶購成功人數:"

                                 + (1-(valint-100));

                         System.out.println(succinfo);

                         /* 搶購成功業務邏輯 */

                         jedis.setnx(succuserifo, succinfo);

                    }

                }

            } else {

                String failuserifo ="kcfail" +  userinfo;

                String failinfo1="使用者：" + failuserifo + "商品被搶購完畢，搶購失敗";

                System.out.println(failinfo1);

                jedis.setnx(failuserifo, failinfo1);

                // Thread.sleep(500);

                return;

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            jedis.close();

        }

    }

}