redis-seconds Kill Scene Application

Redis Util implementation

Package Test.jedis;import Java.util.list;import Java.util.set;import redis.clients.jedis.jedis;import Redis.clients.jedis.transaction;public class Jedisutil {public static Jedis Redis = new Jedis ("localhost", 6379);//Connect Red isstatic{//initialization of shopping data Redis.set ("Buy:number:1", "10000");} /** * The process of executing a transaction other clients change the key value, resolve the data consistency problem * through watch key monitoring to implement other client modification data, transaction cancellation * Usage first use watch to start the monitoring of key in the open transaction, the order must first monitor in the execution of the transaction * /public synchronized static string Buy_trans (String userId) throws Interruptedexception{//1, the keys are designed to guarantee that each user can purchase only one if ( !redis.exists (userId)) {///2, when the number is not purchased prompt seconds to kill if (Integer.parseint (Redis.get ("buy:number:1")) >0) {//3, REDIS transaction monitoring number of        Change key=buy:number:1 monitor number of goods 1th change Redis.watch ("buy:number:1");         4. Open transaction Transaction tx = Redis.multi ();        5. Successful purchase of TX.INCR (USERID) successfully purchased by the user;        6, set the number minus 1 tx.decr ("buy:number:1");        7, the execution transaction list<object> results = Tx.exec ();    }else{return "Insufficient quantity";     } redis.disconnect (); Return "snapping up purchase Success";} Else{retUrn "The user has already purchased";}} public static set<string> Getkeys (String keys) {return redis.keys (keys);}}

Controller-Side implementation

package Com.sf.fs.view;import Java.util.set;import Javax.servlet.http.httpservletrequest;import Org.springframework.stereotype.controller;import Org.springframework.web.bind.annotation.requestmapping;import com.sf.fs.service.seckillservice;/** * Seckill Test * */@Controllerpublic class Seckillcontroller {private Seckillservice seckillservice;public void Setseckillservice ( Seckillservice seckillservice) {this.seckillservice = Seckillservice;} /** * * */@RequestMapping ("/buying") public String Buying (httpservletrequest req) {//test for easy testing with SessionID as user ID String sessionid=req.getsession (). GetId ();//The stored key is user:sessionidstring msg=seckillservice.buying ("User:" + SESSIONID); SYSTEM.OUT.PRINTLN ("Returned operation result:" +msg); return "Succeed";} /** * Test the number of users successfully snapped, whether there will be oversold * */@RequestMapping ("/result") public void GetResult (HttpServletRequest req) {set<string > sets=seckillservice.getusers ("user:*"); System.out.println ("Number of users successfully killed:" +sets.size ());}} 

Service implementation

Package Com.sf.fs.service.impl;import Java.util.list;import Java.util.set;import com.sf.fs.service.SeckillService; Import Test.jedis.jedisutil;public class Seckillserviceimpl implements Seckillservice {public static int number=100; Private Jedisutil jedisutil;public void Setjedisutil (Jedisutil jedisutil) {this.jedisutil = Jedisutil;} @Overridepublic  String Buying (string key) {try {return Jedisutil.buy_trans (key)} catch (Interruptedexception e) {/ /TODO auto-generated catch Blocke.printstacktrace ();} Return "operation failed";} Public set<string> getusers (String prefixkey) {return Jedisutil.getkeys (Prefixkey);}}

　　

redis-seconds Kill Scene Application