文章瀏覽量統計,low的作法是:用戶每次瀏覽,前端會發送一個GET
請求獲取一篇文章詳情時,會把這篇文章的瀏覽量+1
,存進數據庫裏。
ElasticSearch
的存儲,同步更新緩存和ElasticSearch
更新同步更新太耗時,不更新就會致使數據不一致性。HyperLogLog
HyperLogLog
是Probabilistic data Structures
的一種,這類數據結構的基本大的思路就是使用統計機率上的算法,犧牲數據的精準性來節省內存的佔用空間及提高相關操做的性能。前端
設計思路java
ip
和文章id
,進行惟一校驗,即同一個用戶屢次訪問同一篇文章,改文章訪問量只增長1;opsForHyperLogLog().add(key,value)
的存儲在Redis
中,在半夜瀏覽量低的時候,經過定時任務,將瀏覽量更新至數據庫中。sql
DROP TABLE IF EXISTS `article`; CREATE TABLE `article` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主鍵', `title` varchar(100) NOT NULL COMMENT '標題', `content` varchar(1024) NOT NULL COMMENT '內容', `url` varchar(100) NOT NULL COMMENT '地址', `views` bigint(20) NOT NULL COMMENT '瀏覽量', `create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '建立時間', PRIMARY KEY (`id`) ) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8; INSERT INTO article VALUES(1,'測試文章','content','url',10,NULL);
插入了一條數據,並設計訪問量已經爲10了,便於測試。
pom.xml
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> </dependency> <!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!-- mybatis --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!-- redis --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>2.0</version> </dependency> <!-- lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency>
application.yml
spring: # 數據庫配置 datasource: url: jdbc:mysql://47.98.178.84:3306/dev username: dev password: password driver-class-name: com.mysql.cj.jdbc.Driver redis: host: 47.98.178.84 port: 6379 database: 1 password: password timeout: 60s # 鏈接超時時間,2.0 中該參數的類型爲Duration,這裏在配置的時候須要指明單位 # 鏈接池配置,2.0中直接使用jedis或者lettuce配置鏈接池(使用lettuce,依賴中必須包含commons-pool2包) lettuce: pool: # 最大空閒鏈接數 max-idle: 500 # 最小空閒鏈接數 min-idle: 50 # 等待可用鏈接的最大時間,負數爲不限制 max-wait: -1s # 最大活躍鏈接數,負數爲不限制 max-active: -1 # mybatis mybatis: mapper-locations: classpath:mapper/*.xml # type-aliases-package: cn.van.redis.view.entity
Redis
中@Target({ElementType.PARAMETER, ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface PageView { /** * 描述 */ String description() default ""; }
@Aspect @Configuration @Slf4j public class PageViewAspect { @Autowired private RedisUtils redisUtil; /** * 切入點 */ @Pointcut("@annotation(cn.van.redis.view.annotation.PageView)") public void PageViewAspect() { } /** * 切入處理 * @param joinPoint * @return */ @Around("PageViewAspect()") public Object around(ProceedingJoinPoint joinPoint) { Object[] object = joinPoint.getArgs(); Object articleId = object[0]; log.info("articleId:{}", articleId); Object obj = null; try { String ipAddr = IpUtils.getIpAddr(); log.info("ipAddr:{}", ipAddr); String key = "articleId_" + articleId; // 瀏覽量存入redis中 Long num = redisUtil.add(key,ipAddr); if (num == 0) { log.info("該ip:{},訪問的瀏覽量已經新增過了", ipAddr); } obj = joinPoint.proceed(); } catch (Throwable e) { e.printStackTrace(); } return obj; } }
RedisUtils.java
@Component public class RedisUtils { @Resource private RedisTemplate<String, Object> redisTemplate; /** * 刪除緩存 * @param key 能夠傳一個值 或多個 */ public void del(String... key) { redisTemplate.delete(key[0]); } /** * 計數 * @param key * @param value */ public Long add(String key, Object... value) { return redisTemplate.opsForHyperLogLog().add(key,value); } /** * 獲取總數 * @param key */ public Long size(String key) { return redisTemplate.opsForHyperLogLog().size(key); } }
IpUtils.java
該工具類我在Mac
下測試沒問題,Windows
下若是有問題,請反饋給我
@Slf4j public class IpUtils { public static String getIpAddr() { try { Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces(); InetAddress ip = null; while (allNetInterfaces.hasMoreElements()) { NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement(); if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) { continue; } else { Enumeration<InetAddress> addresses = netInterface.getInetAddresses(); while (addresses.hasMoreElements()) { ip = addresses.nextElement(); if (ip != null && ip instanceof Inet4Address) { log.info("獲取到的ip地址:{}", ip.getHostAddress()); return ip.getHostAddress(); } } } } } catch (Exception e) { log.error("獲取ip地址失敗,{}",e); } return null; } }
ArticleViewTask.java
ArticleService.java
裏面的代碼比較簡單,詳見文末源碼。
@Component @Slf4j public class ArticleViewTask { @Resource private RedisUtils redisUtil; @Resource ArticleService articleService; // 天天凌晨一點執行 @Scheduled(cron = "0 0 1 * * ? ") @Transactional(rollbackFor=Exception.class) public void createHyperLog() { log.info("瀏覽量入庫開始"); List<Long> list = articleService.getAllArticleId(); list.forEach(articleId ->{ // 獲取每一篇文章在redis中的瀏覽量,存入到數據庫中 String key = "articleId_"+articleId; Long view = redisUtil.size(key); if(view>0){ ArticleDO articleDO = articleService.getById(articleId); Long views = view + articleDO.getViews(); articleDO.setViews(views); int num = articleService.updateArticleById(articleDO); if (num != 0) { log.info("數據庫更新後的瀏覽量爲:{}", views); redisUtil.del(key); } } }); log.info("瀏覽量入庫結束"); } }
PageController.java
@RestController @Slf4j public class PageController { @Autowired private ArticleService articleService; @Autowired private RedisUtils redisUtil; /** * 訪問一篇文章時,增長其瀏覽量:重點在的註解 * @param articleId:文章id * @return */ @PageView @RequestMapping("/{articleId}") public String getArticle(@PathVariable("articleId") Long articleId) { try{ ArticleDO blog = articleService.getById(articleId); log.info("articleId = {}", articleId); String key = "articleId_"+articleId; Long view = redisUtil.size(key); log.info("redis 緩存中瀏覽數:{}", view); //直接從緩存中獲取並與以前的數量相加 Long views = view + blog.getViews(); log.info("文章總瀏覽數:{}", views); } catch (Throwable e) { return "error"; } return "success"; } }
這裏,具體的Service
中的方法由於都被我放在Controller
中處理了,因此就是剩下簡單的Mapper
調用了,這裏就不浪費時間了,詳見文末源碼。(按理說,這些邏輯處理,應該放在Service
處理的,請按實際狀況優化)
啓動項目,測試訪問量,先請求http://localhost:8080/1,日誌打印以下:mysql
2019-03-2623:50:50.047 INFO 2970 --- [nio-8080-exec-1] cn.van.redis.view.aspect.PageViewAspect : articleId:1 2019-03-2623:50:50.047 INFO 2970 --- [nio-8080-exec-1] cn.van.redis.view.utils.IpUtils : 獲取到的ip地址:192.168.1.104 2019-03-2623:50:50.047 INFO 2970 --- [nio-8080-exec-1] cn.van.redis.view.aspect.PageViewAspect : ipAddr:192.168.1.104 2019-03-2623:50:50.139 INFO 2970 --- [nio-8080-exec-1] io.lettuce.core.EpollProvider : Starting without optional epoll library 2019-03-2623:50:50.140 INFO 2970 --- [nio-8080-exec-1] io.lettuce.core.KqueueProvider : Starting without optional kqueue library 2019-03-2623:50:50.349 INFO 2970 --- [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2019-03-2623:50:50.833 INFO 2970 --- [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed. 2019-03-2623:50:50.872 INFO 2970 --- [nio-8080-exec-1] c.v.r.v.web.controller.PageController : articleId = 1 2019-03-2623:50:50.899 INFO 2970 --- [nio-8080-exec-1] c.v.r.v.web.controller.PageController : redis 緩存中瀏覽數:1 2019-03-2623:50:50.900 INFO 2970 --- [nio-8080-exec-1] c.v.r.v.web.controller.PageController : 文章總瀏覽數:11
觀察一下,數據庫,訪問量確實沒有增長,本機再次訪問,發現,日誌打印以下:git
2019-03-2623:51:14.658 INFO 2970 --- [nio-8080-exec-3] cn.van.redis.view.aspect.PageViewAspect : articleId:1 2019-03-2623:51:14.658 INFO 2970 --- [nio-8080-exec-3] cn.van.redis.view.utils.IpUtils : 獲取到的ip地址:192.168.1.104 2019-03-2623:51:14.658 INFO 2970 --- [nio-8080-exec-3] cn.van.redis.view.aspect.PageViewAspect : ipAddr:192.168.1.104 2019-03-2623:51:14.692 INFO 2970 --- [nio-8080-exec-3] cn.van.redis.view.aspect.PageViewAspect : 該ip:192.168.1.104,訪問的瀏覽量已經新增過了 2019-03-2623:51:14.752 INFO 2970 --- [nio-8080-exec-3] c.v.r.v.web.controller.PageController : articleId = 1 2019-03-2623:51:14.760 INFO 2970 --- [nio-8080-exec-3] c.v.r.v.web.controller.PageController : redis 緩存中瀏覽數:1 2019-03-2623:51:14.761 INFO 2970 --- [nio-8080-exec-3] c.v.r.v.web.controller.PageController : 文章總瀏覽數:11
2019-03-27 01:00:00.265 INFO 2974 --- [ scheduling-1] cn.van.redis.view.task.ArticleViewTask : 瀏覽量入庫開始 2019-03-27 01:00:00.448 INFO 2974 --- [ scheduling-1] io.lettuce.core.EpollProvider : Starting without optional epoll library 2019-03-27 01:00:00.449 INFO 2974 --- [ scheduling-1] io.lettuce.core.KqueueProvider : Starting without optional kqueue library 2019-03-27 01:00:00.663 INFO 2974 --- [ scheduling-1] cn.van.redis.view.task.ArticleViewTask : 數據庫更新後的瀏覽量爲:11 2019-03-27 01:00:00.682 INFO 2974 --- [ scheduling-1] cn.van.redis.view.task.ArticleViewTask : 瀏覽量入庫結束
觀察一下數據庫,發現數據庫中的瀏覽量增長到11
,同時,Redis
中的瀏覽量沒了,說明成功!github
Github 示例代碼web
風塵博客公衆號:redis