redis使用watch秒殺搶購實(shí)現(xiàn)思路

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import redis.clients.jedis.Jedis;

/**
 * redis測(cè)試搶購
 * 
 * @author 10255_000
 * 
 */
public class RedisTest {
 public static void main(String[] args) {
 final String watchkeys = "watchkeys";
 ExecutorService executor = Executors.newFixedThreadPool(20);

 final Jedis jedis = new Jedis("192.168.3.202", 6379);
 jedis.set(watchkeys, "0");// 重置watchkeys為0
 jedis.del("setsucc", "setfail");// 清空搶成功的，與沒有成功的
 jedis.close();

 for (int i = 0; i  10000; i++) {// 測(cè)試一萬人同時(shí)訪問
  executor.execute(new MyRunnable());
 }
 executor.shutdown();
 }
}


import java.util.List;
import java.util.UUID;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;

public class MyRunnable implements Runnable {

 String watchkeys = "watchkeys";// 監(jiān)視keys
 Jedis jedis = new Jedis("192.168.3.202", 6379);

 public MyRunnable() {
 }

 @Override
 public void run() {
 try {
  jedis.watch(watchkeys);// watchkeys

  String val = jedis.get(watchkeys);
  int valint = Integer.valueOf(val);
  String userifo = UUID.randomUUID().toString();
  if (valint  10) {
  Transaction tx = jedis.multi();// 開啟事務(wù)

  tx.incr("watchkeys");

  ListObject> list = tx.exec();// 提交事務(wù)，如果此時(shí)watchkeys被改動(dòng)了，則返回null
  if (list != null) {
   System.out.println("用戶：" + userifo + "搶購成功，當(dāng)前搶購成功人數(shù):"
    + (valint + 1));
   /* 搶購成功業(yè)務(wù)邏輯 */
   jedis.sadd("setsucc", userifo);
  } else {
   System.out.println("用戶：" + userifo + "搶購失敗");
   /* 搶購失敗業(yè)務(wù)邏輯 */
   jedis.sadd("setfail", userifo);
  }

  } else {
  System.out.println("用戶：" + userifo + "搶購失敗");
  jedis.sadd("setfail", userifo);
  // Thread.sleep(500);
  return;
  }

 } catch (Exception e) {
  e.printStackTrace();
 } finally {
  jedis.close();
 }

 }

}