JavaWeb_LeadNews_Day10-Xxljob, Redis实现定时热文章

xxl-job概述

windows部署调度中心

1. 运行 xxl-job\doc\db\tables_xxl_job.sql
2. 修改 xxl-job-admin子模块下的application.properties

   spring.datasource.password=1234
   

3. 启动 xxl-job-admin子模块下的启动程序
4. 访问localhost:8080/xxl-job-admin, 账号: admin, 密码:123456

docker部署调度中心

1. 创建mysql容器

docker run -p 3306:3306 --name mysql57 \
-v /opt/mysql/conf:/etc/mysql \
-v /opt/mysql/logs:/var/log/mysql \
-v /opt/mysql/data:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=root \
-d mysql:5.7.25

2. 拉取镜像

docker pull xuxueli/xxl-job-admin:2.3.0

3. 创建xxl-job-admin容器

docker run -e PARAMS="--spring.datasource.url=jdbc:mysql://192.168.174.133:3306/xxl_job?Unicode=true&characterEncoding=UTF-8 \
--spring.datasource.username=root \
--spring.datasource.password=root" \
-p 8888:8080 -v /tmp:/data/applogs \
--name xxl-job-admin -d xuxueli/xxl-job-admin:2.3.0

xxl-job入门案例

1. 调度中心新建示例任务
   
2. 依赖

   <dependency>
       <groupId>com.xuxueligroupId>
       <artifactId>xxl-job-coreartifactId>
       <version>2.3.0version>
   dependency>
   

3. 配置
   application.yml

   server:
     port: 8881
   
   xxl:
     job:
       admin:
         addresses: http://192.168.174.133:8888/xxl-job-admin
       executor:
         appname: xxl-job-executor-sample
         port: 9999
   

   XxlJobConfig.java

   @Configuration
   public class XxlJobConfig {
       private Logger logger = LoggerFactory.getLogger(XxlJobConfig.class);
   
       @Value("${xxl.job.admin.addresses}")
       private String adminAddresses;
   
       @Value("${xxl.job.executor.appname}")
       private String appname;
   
       @Value("${xxl.job.executor.port}")
       private int port;
   
       @Bean
       public XxlJobSpringExecutor xxlJobExecutor() {
           logger.info(">>>>>>>>>>> xxl-job config init.");
           XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();
           xxlJobSpringExecutor.setAdminAddresses(adminAddresses);
           xxlJobSpringExecutor.setAppname(appname);
           xxlJobSpringExecutor.setPort(port);
   
           return xxlJobSpringExecutor;
       }
   
       /**
        * 针对多网卡、容器内部署等情况，可借助 "spring-cloud-commons" 提供的 "InetUtils" 组件灵活定制注册IP；
        *
        *      1、引入依赖：
        *          
        *             org.springframework.cloud
        *             spring-cloud-commons
        *             ${version}
        *         
        *
        *      2、配置文件，或者容器启动变量
        *          spring.cloud.inetutils.preferred-networks: 'xxx.xxx.xxx.'
        *
        *      3、获取IP
        *          String ip_ = inetUtils.findFirstNonLoopbackHostInfo().getIpAddress();
        */
   }
   

4. 任务代码

   @Component
   public class HelloJob {
   
       @XxlJob("demoJobHandler")
       public void demoJobHandler()
       {
           XxlJobHelper.log("XXL-JOB, Hello World.");
           System.out.println("简单任务执行...");
       }
   
   }
   

xxl-job分片广播

1. 创建分片执行器 xxl-job-sharding-sample
2. 创建任务, 路由策略为分片广播
3. 分片广播任务代码, 创建多个实例

   @XxlJob("shardingJobHandler")
   public void shardingJobHandler()
   {
       // 分片的参数
       int shardIndex = XxlJobHelper.getShardIndex(); // 实例在集群中的序号
       int shardTotal = XxlJobHelper.getShardTotal(); // 集群总量
   
       // 业务逻辑
       List<Integer> list = getList();
       for (Integer integer : list) {
           if(integer % shardTotal == shardIndex){
               System.out.println("当前分片: "+shardIndex+", 当前任务项: "+integer);
           }
       }
   }
   
   public List<Integer> getList()
   {
       List<Integer> list = new ArrayList<>();
       for (int i = 0; i < 10000; i++) {
           list.add(i);
       }
       return list;
   }
   

热点文章定时计算

思路分析

具体实现

热文章计算

@Slf4j
@Service
@Transactional
public class HotArticleServiceImpl implements HotArticleService {

    @Autowired
    private ApArticleMapper apArticleMapper;

    /**
     * 计算热门文章
     */
    @Override
    public void computeHotArticle() {
        // 1. 查询前5天的文章数据
        Date dayParam = DateTime.now().minusDays(5).toDate();
        List<ApArticle> articleList = apArticleMapper.findArticleListByLast5days(dayParam);

        // 2. 计算文章的分值
        List<HotArticleVo> hotArticleVoList = getHotArticleVoList(articleList);

        // 3. 为每个频道缓存30条分值较高的文章
        cacheTagToRedis(hotArticleVoList);
    }

    @Autowired
    private IWemediaClient wemediaClient;

    @Autowired
    private CacheService cacheService;


    /**
     * 为每个频道缓存30条分值较高的文章
     * @param hotArticleVoList
     */
    private void cacheTagToRedis(List<HotArticleVo> hotArticleVoList) {
        // 为每个频道缓存30条分值较高的文章
        ResponseResult responseResult = wemediaClient.getChannels();
        if(responseResult.getCode().equals(200)){
            String jsonString = JSON.toJSONString(responseResult.getData());
            List<WmChannel> wmChannelList = JSON.parseArray(jsonString, WmChannel.class);
            // 检索出每个频道的文章
            if(wmChannelList!=null){
                for (WmChannel wmChannel : wmChannelList) {
                    List<HotArticleVo> hotArticleVos = hotArticleVoList.stream().filter(item ->
                        item.getChannelId().equals(wmChannel.getId())
                    ).collect(Collectors.toList());

                    // 给文章排序, 取30条分值较高的文章存入redis key: 频道id value: 30条分值较高的文章
                    sortAndCache(hotArticleVos, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + wmChannel.getId());
                }
            }
        }

        // 设置推荐数据
        // 给文章排序, 取30条分值较高的文章存入redis key: 频道id value: 30条分值较高的文章
        sortAndCache(hotArticleVoList, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + ArticleConstants.DEFAULT_TAG);
    }

    /**
     * 排序并且缓存数据
     * @param hotArticleVos
     * @param key
     */
    private void sortAndCache(List<HotArticleVo> hotArticleVos, String key) {
        hotArticleVos = hotArticleVos.stream().sorted(
                Comparator.comparing(HotArticleVo::getScore).reversed()
        ).collect(Collectors.toList());
        if(hotArticleVos.size() > 30){
            hotArticleVos = hotArticleVos.subList(0, 30);
        }
        cacheService.set(key, JSON.toJSONString(hotArticleVos));
    }


    /**
     * 获取热文章列表
     * @param articleList
     * @return
     */
    private List<HotArticleVo> getHotArticleVoList(List<ApArticle> articleList) {
        List<HotArticleVo> articleVoList = new ArrayList<>();
        if(articleList!=null) {
            for (ApArticle apArticle : articleList) {
                HotArticleVo hotArticleVo = new HotArticleVo();
                BeanUtils.copyProperties(apArticle, hotArticleVo);
                Integer score = computeArticleScore(apArticle);
                hotArticleVo.setScore(score);
                articleVoList.add(hotArticleVo);
            }
        }
        return articleVoList;
    }

    /**
     * 计算文章分数
     * @param apArticle
     * @return
     */
    private Integer computeArticleScore(ApArticle apArticle) {
        Integer score = 0;
        if(apArticle.getLikes() != null){
            score += ArticleConstants.HOT_ARTICLE_LIKE_WEIGHT*apArticle.getLikes();
        }
        if(apArticle.getComment() != null){
            score += ArticleConstants.HOT_ARTICLE_COMMENT_WEIGHT*apArticle.getComment();
        }
        if(apArticle.getCollection() != null){
            score += ArticleConstants.HOT_ARTICLE_COLLECTION_WEIGHT*apArticle.getCollection();
        }
        if(apArticle.getViews() != null){
            score += apArticle.getViews();
        }
        return score;
    }
}

// ApArticleMapper.java
List<ApArticle> findArticleListByLast5days(@Param("dayParam") Date dayParam);

// ApArticleMapper.xml
<select id="findArticleListByLast5days" resultType="com.heima.model.article.pojos.ApArticle">
    SELECT
    aa.*
    FROM
    `ap_article` aa
    LEFT JOIN ap_article_config aac ON aa.id = aac.article_id
    <where>
        and aac.is_delete != 1
        and aac.is_down != 1
        <if test="dayParam != null">
            and aa.publish_time <![CDATA[>=]]> #{dayParam}
        </if>
    </where>
</select>

总结:

1. ApArticleMapper.java中的形参必须添加@Param注解, 否则在ApArticleMapper.xml中会将dayParam解释为Date的属性然后报错.

定时计算

1. 新建热文章计算执行器leadnews-hot-article-executor
2. 新建定时任务
   
3. 依赖和配置
4. 任务代码

   @Component
   @Slf4j
   public class ComputeHotArticleJob {
   
       @Autowired
       private HotArticleService hotArticleService;
   
       @XxlJob("computeHotArticleJob")
       public void handle()
       {
           log.info("热文章分值计算调度任务开始执行...");
           hotArticleService.computeHotArticle();
           log.info("热文章分值计算调度任务执行结束...");
       }
   
   }
   

查询文章接口改造

// article-Controller
public class ArticleHomeController {

    ...

    public ResponseResult load(@RequestBody ArticleHomeDto articleHomeDto)
    {
        // return apArticleService.load(articleHomeDto, ArticleConstants.LOADTYPE_LOAD_MORE);
        return apArticleService.load2(articleHomeDto, ArticleConstants.LOADTYPE_LOAD_MORE, true);
    }

    ...
}

// article-Service
public ResponseResult load2(ArticleHomeDto dto, Short type, boolean firstPage) {
    if(firstPage==true){
        String jsonString = cacheService.get(ArticleConstants.HOT_ARTICLE_FIRST_PAGE + dto.getTag());
        if(StringUtils.isNotBlank(jsonString)){
            List<HotArticleVo> hotArticleVoList = JSON.parseArray(jsonString, HotArticleVo.class);
            return ResponseResult.okResult(hotArticleVoList);
        }
    }
    return load(dto, type);
}

来源

黑马程序员. 黑马头条

Gitee

https://gitee.com/yu-ba-ba-ba/leadnews