Java高并发秒时啊API之Service层1

Java高并发秒时啊API之Service层

---2-1 使用Spring托管Service依赖理论----------------------------

 

spring ioc优势(工厂模式):
1.对象创建统一托管
2.规范的生命周期管理
3.灵活的依赖注入
4.一致的获取对象

 

Spring IOC 功能的理解
DAO依赖+Service依赖最终形成一致访问接口;
随意访问依赖对象

 

Spring IOC 容器下的 对象 默认都是单例的。

业务对象依赖图:Spring IOC容器 通过 DI 解决 依赖链(对象之间的依赖关系)

SeckillService ->SeckillDao  ->SqlSessionFactry->DataSource...

      ->successKilledDao

Spring-IOC注入方式和场景

本项目IOC使用:

  XML配置

  package-scan

  Annotation注解

 ---2-2 使用Spring托管Service依赖配置---------------------------------------------------------

 

SeckillServiceImpl.java:

  配置spring-service.xml

  标注注解@Service和@Autowired

package org.seckill.service.impl;

import java.util.Date;
import java.util.List;

import org.seckill.dao.SeckillDao;
import org.seckill.dao.SuccessKilledDao;
import org.seckill.dto.Exposer;
import org.seckill.dto.SeckillExecution;
import org.seckill.entity.Seckill;
import org.seckill.entity.SuccessKilled;
import org.seckill.enums.SeckillStatEnum;
import org.seckill.exception.RepeatKillExeception;
import org.seckill.exception.SeckillCloseException;
import org.seckill.exception.SeckillException;
import org.seckill.service.SeckillService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

//@Component @service @Dao @Controller
@Service
public class SeckillServiceImpl implements SeckillService {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    
    //注入Service依赖
    @Autowired //在Spring 查找Dao类型的实例(Mybatis实现的,),并注入。不在需要自己new 实例
    //还有@Resource,@Inject等J2EE规范的注解
    private SeckillDao seckillDao;
    @Autowired
    private SuccessKilledDao successKilledDao;
    
    //md5盐值字符串,用于混淆MD5
    private final String slat = "sldijfldkjfpaojj@#(#$sldfj`123";
    @Override
    public List<Seckill> getSeckillList() {
        return seckillDao.queryAll(0, 4);
    }

    @Override
    public Seckill getById(long seckillId) {
        // TODO Auto-generated method stub
        return seckillDao.queryById(seckillId);
    }

    @Override
    public Exposer exportSeckillUrl(long seckillId) {
        Seckill seckill = seckillDao.queryById(seckillId);
        if(seckill == null){
            return new Exposer(false,seckillId);
        }
        Date startTime = seckill.getStartTime();
        Date endTime = seckill.getEndTime();
        //系统当前时间
        Date nowTime = new Date();
        if(nowTime.getTime() < startTime.getTime()
                || nowTime.getTime() > endTime.getTime()){
            return new Exposer(false,seckillId,nowTime.getTime(),startTime.getTime(),
                    endTime.getTime());
        }
        //转化特定字符串的过程,不可逆
        String md5 = getMD5(seckillId);//TODO
        return new Exposer(true,md5,seckillId);
    }

    private String getMD5(long seckillId){
        String base = seckillId+"/"+slat;
        String md5 = DigestUtils.md5DigestAsHex(base.getBytes());
        return md5;
    }
    @Override
    public SeckillExecution executeSeckill(long seckillId, long userPhone, String md5)
            throws SeckillException, RepeatKillExeception, SeckillCloseException {
        if(md5==null|| !md5.equals(getMD5(seckillId))){
            throw new SeckillException("seckill data rewrite");
        }
        //执行秒杀逻辑:减库存 + 记录购买行为
        Date nowTime = new Date();
        try{

            int updateCount = seckillDao.reduceNumber(seckillId, nowTime);
            if(updateCount <=0){
                //没有更新记录
                throw new SeckillCloseException("seckill is closed");
            } else {
                //记录购买行为
                int insertCount= successKilledDao.insertSuccessKilled(seckillId, userPhone);
                //唯一:insert ignore 
                if(insertCount <=0){
                    //重复秒杀
                    throw new RepeatKillExeception("seckill repeated");
                }else {
                    //秒杀成功
                    SuccessKilled successKilled = successKilledDao.queryByIdWithSeckill(seckillId, userPhone);
                    //return new SeckillExecution(seckillId,1,"秒杀成功",successKilled);
                    return new  SeckillExecution(seckillId,SeckillStatEnum.SUCCESS);
                }
            }
            
        } catch (SeckillCloseException e1) {
            throw e1;
        } catch (RepeatKillExeception e2) {
            throw e2;
        }catch (Exception e){
            logger.error(e.getMessage(),e);
            //所有编译期异常 转化为运行期异常
            //spring事务会做roll back
            throw new SeckillException("seckill inner error : "+e.getMessage());
        }
    }

}

 

spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.1.xsd">
    <!-- 扫描service包下所使用注解的类型 -->
    <context:component-scan base-package="org.seckill.service"/>
</beans>

 ---3-1 使用Spring声明式事务理论---------------------------------------------------------

1.什么是声明式事务

  通过Spring来管理(全自动),解脱事务代码

2.声明式事务使用方式:

ProxyFactoryBean + XML  -------> 早期使用方式(2.0)

tx:advice + aop命名空间    ------> 一次配置永久生效

注解@Transactional (推荐) ------>注解控制()

注解控制:在控制事务方法上加入注解,在开发中大家遵守约定。

 

3.事务方法嵌套:

  声明式事务独有的概念

  传播行为--->propagation_required,如果有事务就加入到事务的原有逻辑,如果没有就创建一个新事务。

 

4.什么时候回滚:

  抛出运行期异常(RuntimeException)

  小心不当的try-catch(如果不小心抛出了编译期异常,Spring不会回滚)

 

 ---3-2 使用Spring声明式事务配置---------------------------------------------------------

 建议:使用注解而不是XML控制事务

    事务要小心设计

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.1.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 扫描service包下所使用注解的类型 -->
    <context:component-scan base-package="org.seckill.service"/>
    
    <!-- 配置事务管理器 :Mybatis采用JDBC的事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        
        <!-- 注入数据库的连接池(xml方式) -->
        <!-- dataSource定义在dao的xml中。Spring整体运行时,把spring-dao.xml和本xml都给了之后,就可以正常运行 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
    <!-- 配置基于注解的声明式事务 
         默认使用注解来管理事务行为    
    -->
    <!-- 注意配置tx的命名空间xmlns和xsi:schemaLocation -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

使用AOP的方式配置不推荐,对于真正需要标注的方法定位不精确。

 

SeckillServiceImpl.java :需要使用事务管理的方法添加@Transactional注解

使用注解控制事务方法的优点:
1、开发团队达成一致约定,明确标注事务方法的编程风格。
ps:使用aop管理事务会造成可能遗忘需要使用什么方法命名等问题
2、保证事务方法的执行时间尽可能短,不要穿插其他网络操作rpc/http等或者剥离到事务外部。
ps:因为这些操作一次要几毫秒到几十毫秒,影响事务速度。
3、不是所有的方法都需要事务,如只有一条修改操作,只读操作不需要事务控制。
ps:如果在配置文件里配置永久<tx:advice aop命名空间>使用aop控制事务,不同的人的命名习惯可能会给不需要事务的方法添加事务
    @Override
    @Transactional
    /*
     * 使用注解控制事务方法的优点:
     *    1、开发团队达成一致约定,明确标注事务方法的编程风格。
     *        ps:使用aop管理事务会造成可能遗忘需要使用什么方法命名等问题
     *    2、保证事务方法的执行时间尽可能短,不要穿插其他网络操作rpc/http等或者剥离到事务外部。
     *      ps:因为这些操作一次要几毫秒到几十毫秒,影响事务速度。
     *  3、不是所有的方法都需要事务,如只有一条修改操作,只读操作不需要事务控制。
     *      ps:如果在配置文件里配置永久<tx:advice aop命名空间>使用aop控制事务,不同的人的命名习惯可能会给不需要事务的方法添加事务
     * */
    public SeckillExecution executeSeckill(long seckillId, long userPhone, String md5)
            throws SeckillException, RepeatKillExeception, SeckillCloseException {
        if(md5==null|| !md5.equals(getMD5(seckillId))){
            throw new SeckillException("seckill data rewrite");
        }
        //执行秒杀逻辑:减库存 + 记录购买行为
        Date nowTime = new Date();
        try{

            int updateCount = seckillDao.reduceNumber(seckillId, nowTime);
            if(updateCount <=0){
                //没有更新记录
                throw new SeckillCloseException("seckill is closed");
            } else {
                //记录购买行为
                int insertCount= successKilledDao.insertSuccessKilled(seckillId, userPhone);
                //唯一:insert ignore 
                if(insertCount <=0){
                    //重复秒杀
                    throw new RepeatKillExeception("seckill repeated");
                }else {
                    //秒杀成功
                    SuccessKilled successKilled = successKilledDao.queryByIdWithSeckill(seckillId, userPhone);
                    //return new SeckillExecution(seckillId,1,"秒杀成功",successKilled);
                    return new  SeckillExecution(seckillId,SeckillStatEnum.SUCCESS);
                }
            }
            
        } catch (SeckillCloseException e1) {
            throw e1;
        } catch (RepeatKillExeception e2) {
            throw e2;
        }catch (Exception e){
            logger.error(e.getMessage(),e);
            //所有编译期异常 转化为运行期异常
            //spring事务会做roll back
            throw new SeckillException("seckill inner error : "+e.getMessage());
        }
    }

 

 ---4-1 完成Service集成测试---------------------------------------------------------

 1.logback配置

logback-test.xml place it into a directory accessible from the class path(放在classpath下:resources下)
    public void testGetSeckillList() {
        List<Seckill> list= seckillService.getSeckillList();
        logger.info("list={}",list);
     }
打印日志可以用占位符,输出在{}内
来自一个代码洁癖患者的忠告:
关于logback文档警告问题的解决:
在文档头加入空的dtd即可:<!DOCTYPE xml>
参考:
http://stackoverflow.com/questions/5731162/xml-schema-or-dtd-for-logback-xml

\seckill\src\main\resources\logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <!-- encoders are assigned the type
         ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>

 

 

2.JUnit 测试类

package org.seckill.service;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.seckill.dto.Exposer;
import org.seckill.dto.SeckillExecution;
import org.seckill.entity.Seckill;
import org.seckill.exception.RepeatKillExeception;
import org.seckill.exception.SeckillCloseException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:spring/spring-dao.xml",
                       "classpath:spring/spring-service.xml"})
public class SeckillServiceImplTest {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @Autowired
    private SeckillService seckillService;
    @Test
    public void testGetSeckillList() throws Exception{
        List<Seckill> list= seckillService.getSeckillList();
        logger.info("list={}",list);
     }

    @Test
    public void testGetById() throws Exception{
        long id = 1000;
        Seckill seckill = seckillService.getById(id);
        logger.info("seckill={}",seckill);
    }

    @Test
    public void testExportSeckillUrl() throws Exception{
        long id = 1000;
        Exposer exposer = seckillService.exportSeckillUrl(id);
        logger.info("exposere={}",exposer.toString());
        /*
         * exposed=true,
         * md5=76e96c3b47df23d4239478bf599aae92
         * */
    }

    @Test
    public void testExecuteSeckill() throws Exception{
        long id = 1000;
        long phone = 13411112222L;
        String md5= "76e96c3b47df23d4239478bf599aae92";
        //SeckillExecution正确返回初次执行,SeckillCloseException,RepeatKillExeception(同id+phone重复执行时)都是正确期待结果
        try{
            SeckillExecution execution = seckillService.executeSeckill(id, phone, md5);
            logger.info("SeckillExecution={}",execution);
        }
         catch (SeckillCloseException e) {
             logger.error(e.getMessage());
        } catch (RepeatKillExeception e) {
                logger.error(e.getMessage());
        }
    }
    
    @Test
    //结合3,4组成逻辑测试方法
    //测试代码完整逻辑,注意可重复执行
    public void testSeckillLogic() throws Exception{
        long id = 1000;
        Exposer exposer = seckillService.exportSeckillUrl(id);
        if(exposer.isExposed()){
            logger.info("exposere={}",exposer.toString());
            long phone = 13411112222L;
            String md5= exposer.getMd5();
            //SeckillExecution正确返回初次执行,SeckillCloseException,RepeatKillExeception都是正确期待结果
            try{
                SeckillExecution execution = seckillService.executeSeckill(id, phone, md5);
                logger.info("SeckillExecution={}",execution);
            }
             catch (SeckillCloseException e) {
                 logger.error(e.getMessage());
            } catch (RepeatKillExeception e) {
                    logger.error(e.getMessage());
            }
        }else {
            //秒杀未开启
            logger.warn("exposer={}",exposer);
        }
    }

}

spring事务管理该过程:

13:47:56.706 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
13:47:56.716 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:56.725 [main] DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@934b6cb] will be managed by Spring
13:47:56.733 [main] DEBUG o.s.dao.SeckillDao.reduceNumber - ==>  Preparing: update seckill set number = number - 1 where seckill_id = ? and start_time <= ? and end_time >= ? and number > 0;
13:47:56.784 [main] DEBUG o.s.dao.SeckillDao.reduceNumber - ==> Parameters: 1000(Long), 2017-07-10 13:47:56.698(Timestamp), 2017-07-10 13:47:56.698(Timestamp)
13:47:56.855 [main] DEBUG o.s.dao.SeckillDao.reduceNumber - <==    Updates: 1
13:47:56.856 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:56.856 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1] from current transaction
13:47:56.856 [main] DEBUG o.s.d.S.insertSuccessKilled - ==>  Preparing: insert ignore into Success_killed(seckill_id,user_phone,state) values(?,?,0);
13:47:56.858 [main] DEBUG o.s.d.S.insertSuccessKilled - ==> Parameters: 1000(Long), 13411112222(Long)
13:47:56.970 [main] DEBUG o.s.d.S.insertSuccessKilled - <==    Updates: 1
13:47:56.980 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:56.981 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1] from current transaction
13:47:56.984 [main] DEBUG o.s.d.S.queryByIdWithSeckill - ==>  Preparing: select sk.seckill_id, sk.user_phone, sk.state, sk.create_time, s.seckill_id "seckill.seckill_id", s.name "seckill.name", s.number "seckill.number", s.start_time "seckill.start_time", s.end_time "seckill.end_time", s.create_time "seckill.create_time" from Success_killed sk inner join seckill s on sk.seckill_id =s.seckill_id where sk.seckill_id = ? and sk.user_phone = ?;
13:47:56.984 [main] DEBUG o.s.d.S.queryByIdWithSeckill - ==> Parameters: 1000(Long), 13411112222(Long)
13:47:57.013 [main] DEBUG o.s.d.S.queryByIdWithSeckill - <==      Total: 1
13:47:57.022 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:57.023 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization committing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:57.023 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization deregistering SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:57.023 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2049a9c1]
13:47:57.077 [main] INFO  o.s.service.SeckillServiceImplTest - SeckillExecution=org.seckill.dto.SeckillExecution@7d898981
*/

posted @ 2017-07-08 20:57  charles999  阅读(1202)  评论(0编辑  收藏  举报