1、下单成功,30分钟未支付。支付超时,自动取消订单
2、订单签收,签收后7天未进行评价。订单超时未评价,系统默认好评
3、下单成功,商家5分钟未接单,订单取消
4、配送超时,推送短信提醒
……
对于延时比较长的场景、实时性不高的场景,我们可以采用任务调度的方式定时轮询处理。如:xxl-job
今天我们采用一种比较简单、轻量级的方式,使用 Redis 的延迟队列来进行处理。当然有更好的解决方案,可根据公司的技术选型和业务体系选择最优方案。如:使用消息中间件Kafka、RabbitMQ 的延迟队列
先不讨论其实现原理,直接实战上代码先实现基于 Redis 的延迟队列
<dependency> <groupId>org.redisson</groupId> <artifactId>redisson-spring-boot-starter</artifactId> <version>3.10.5</version> </dependency>
spring: redis: host: 127.0.0.1 port: 6379 password: 123456 database: 12 timeout: 3000
/** * Created by LPB on 2020/04/20. */ @Configuration public class RedissonConfig { @Value("${spring.redis.host}") private String host; @Value("${spring.redis.port}") private int port; @Value("${spring.redis.database}") private int database; @Value("${spring.redis.password}") private String password; @Bean public RedissonClient redissonClient() { Config config = new Config(); config.useSingleServer() .setAddress("redis://" + host + ":" + port) .setDatabase(database) .setPassword(password); return Redisson.create(config); } }
/** * redis延迟队列工具 * Created by LPB on 2021/04/20. */ @Slf4j @Component public class RedisDelayQueueUtil { @Autowired private RedissonClient redissonClient; /** * 添加延迟队列 * @param value 队列值 * @param delay 延迟时间 * @param timeUnit 时间单位 * @param queueCode 队列键 * @param <T> */ public <T> void addDelayQueue(T value, long delay, TimeUnit timeUnit, String queueCode){ try { RBlockingDeque<Object> blockingDeque = redissonClient.getBlockingDeque(queueCode); RDelayedQueue<Object> delayedQueue = redissonClient.getDelayedQueue(blockingDeque); delayedQueue.offer(value, delay, timeUnit); log.info("(添加延时队列成功) 队列键:{},队列值:{},延迟时间:{}", queueCode, value, timeUnit.toSeconds(delay) + "秒"); } catch (Exception e) { log.error("(添加延时队列失败) {}", e.getMessage()); throw new RuntimeException("(添加延时队列失败)"); } } /** * 获取延迟队列 * @param queueCode * @param <T> * @return * @throws InterruptedException */ public <T> T getDelayQueue(String queueCode) throws InterruptedException { RBlockingDeque<Map> blockingDeque = redissonClient.getBlockingDeque(queueCode); T value = (T) blockingDeque.take(); return value; } }
/** * 延迟队列业务枚举 * Created by LPB on 2021/04/20. */ @Getter @NoArgsConstructor @AllArgsConstructor public enum RedisDelayQueueEnum { ORDER_PAYMENT_TIMEOUT("ORDER_PAYMENT_TIMEOUT","订单支付超时,自动取消订单", "orderPaymentTimeout"), ORDER_TIMEOUT_NOT_EVALUATED("ORDER_TIMEOUT_NOT_EVALUATED", "订单超时未评价,系统默认好评", "orderTimeoutNotEvaluated"); /** * 延迟队列 Redis Key */ private String code; /** * 中文描述 */ private String name; /** * 延迟队列具体业务实现的 Bean * 可通过 Spring 的上下文获取 */ private String beanId; }
/** * 延迟队列执行器 * Created by LPB on 2021/04/20. */ public interface RedisDelayQueueHandle<T> { void execute(T t); }
OrderPaymentTimeout:订单支付超时延迟队列处理类
/** * 订单支付超时处理类 * Created by LPB on 2021/04/20. */ @Component @Slf4j public class OrderPaymentTimeout implements RedisDelayQueueHandle<Map> { @Override public void execute(Map map) { log.info("(收到订单支付超时延迟消息) {}", map); // TODO 订单支付超时,自动取消订单处理业务... } }
DelayQueueProcessorForUnevaluatedOrders: 处理未评价订单的延迟队列处理类,用于订单超时未评价的情况
/** * 订单超时未评价处理类 * Created by LPB on 2021/04/20. */ @Component @Slf4j public class OrderTimeoutNotEvaluated implements RedisDelayQueueHandle<Map> { @Override public void execute(Map map) { log.info("(收到订单超时未评价延迟消息) {}", map); // TODO 订单超时未评价,系统默认好评处理业务... } }
/** * 启动延迟队列 * Created by LPB on 2021/04/20. */ @Slf4j @Component public class RedisDelayQueueRunner implements CommandLineRunner { @Autowired private RedisDelayQueueUtil redisDelayQueueUtil; @Override public void run(String... args) { new Thread(() -> { while (true){ try { RedisDelayQueueEnum[] queueEnums = RedisDelayQueueEnum.values(); for (RedisDelayQueueEnum queueEnum : queueEnums) { Object value = redisDelayQueueUtil.getDelayQueue(queueEnum.getCode()); if (value != null) { RedisDelayQueueHandle redisDelayQueueHandle = SpringUtil.getBean(queueEnum.getBeanId()); redisDelayQueueHandle.execute(value); } } } catch (InterruptedException e) { log.error("(Redis延迟队列异常中断) {}", e.getMessage()); } } }).start(); log.info("(Redis延迟队列启动成功)"); } }
以上步骤,Redis 延迟队列核心代码已经完成,下面我们写一个测试接口,用 PostMan 模拟测试一下
/** * 延迟队列测试 * Created by LPB on 2020/04/20. */ @RestController public class RedisDelayQueueController { @Autowired private RedisDelayQueueUtil redisDelayQueueUtil; @PostMapping("/addQueue") public void addQueue() { Map<String, String> map1 = new HashMap<>(); map1.put("orderId", "100"); map1.put("remark", "订单支付超时,自动取消订单"); Map<String, String> map2 = new HashMap<>(); map2.put("orderId", "200"); map2.put("remark", "订单超时未评价,系统默认好评"); // 添加订单支付超时,自动取消订单延迟队列。为了测试效果,延迟10秒钟 redisDelayQueueUtil.addDelayQueue(map1, 10, TimeUnit.SECONDS, RedisDelayQueueEnum.ORDER_PAYMENT_TIMEOUT.getCode()); // 订单超时未评价,系统默认好评。为了测试效果,延迟20秒钟 redisDelayQueueUtil.addDelayQueue(map2, 20, TimeUnit.SECONDS, RedisDelayQueueEnum.ORDER_TIMEOUT_NOT_EVALUATED.getCode()); } }
通过 Redis 客户端可看到两个延迟队列已添加成功
查看 IDEA 控制台日志可看到延迟队列已消费成功
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