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
org.redisson
redisson-spring-boot-starter
3.10.5
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
*/
public void addDelayQueue(T value, long delay, TimeUnit timeUnit, String queueCode){
try {
RBlockingDeque
/**
* 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 {
void execute(T t);
}
/**
* 订单支付超时处理类
* Created by LPB on 2021/04/20.
*/
@Component
@Slf4j
public class OrderPaymentTimeout implements RedisDelayQueueHandle
/**
* 订单超时未评价处理类
* Created by LPB on 2021/04/20.
*/
@Component
@Slf4j
public class OrderTimeoutNotEvaluated implements RedisDelayQueueHandle
/**
* 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 map1 = new HashMap<>();
map1.put("orderId", "100");
map1.put("remark", "订单支付超时,自动取消订单");
Map 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());
}
}