使用場(chǎng)景

1、下單成功，30分鐘未支付。支付超時(shí)，自動(dòng)取消訂單

2、訂單簽收，簽收后7天未進(jìn)行評(píng)價(jià)。訂單超時(shí)未評(píng)價(jià)，系統(tǒng)默認(rèn)好評(píng)

3、下單成功，商家5分鐘未接單，訂單取消

4、配送超時(shí)，推送短信提醒

……

對(duì)于延時(shí)比較長(zhǎng)的場(chǎng)景、實(shí)時(shí)性不高的場(chǎng)景，我們可以采用任務(wù)調(diào)度的方式定時(shí)輪詢處理。如：xxl-job

今天我們采用一種比較簡(jiǎn)單、輕量級(jí)的方式，使用 Redis 的延遲隊(duì)列來(lái)進(jìn)行處理。當(dāng)然有更好的解決方案，可根據(jù)公司的技術(shù)選型和業(yè)務(wù)體系選擇最優(yōu)方案。如：使用消息中間件Kafka、RabbitMQ?的延遲隊(duì)列

先不討論其實(shí)現(xiàn)原理，直接實(shí)戰(zhàn)上代碼先實(shí)現(xiàn)基于 Redis 的延遲隊(duì)列

1、引入 Redisson 依賴

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson-spring-boot-starter</artifactId>
    <version>3.10.5</version>
</dependency>

2、Nacos 配置 Redis 連接

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    password: 123456
    database: 12
    timeout: 3000

3、創(chuàng)建 RedissonConfig 配置

/**
 * 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);
	}

}

4、封裝 Redis 延遲隊(duì)列工具類(lèi)

/**
 * redis延遲隊(duì)列工具
 * Created by LPB on 2021/04/20.
 */
@Slf4j
@Component
public class RedisDelayQueueUtil {

    @Autowired
	private RedissonClient redissonClient;

    /**
     * 添加延遲隊(duì)列
     * @param value 隊(duì)列值
     * @param delay 延遲時(shí)間
     * @param timeUnit 時(shí)間單位
     * @param queueCode 隊(duì)列鍵
     * @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("(添加延時(shí)隊(duì)列成功) 隊(duì)列鍵&#xff1a;{}&#xff0c;隊(duì)列值&#xff1a;{}&#xff0c;延遲時(shí)間&#xff1a;{}", queueCode, value, timeUnit.toSeconds(delay) + "秒");
        } catch (Exception e) {
            log.error("(添加延時(shí)隊(duì)列失敗) {}", e.getMessage());
            throw new RuntimeException("(添加延時(shí)隊(duì)列失敗)");
        }
    }

	/**
	 * 獲取延遲隊(duì)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;
	}
}

5、創(chuàng)建延遲隊(duì)列業(yè)務(wù)枚舉

/**
 * 延遲隊(duì)列業(yè)務(wù)枚舉
 * Created by LPB on 2021/04/20.
 */
@Getter
@NoArgsConstructor
@AllArgsConstructor
public enum RedisDelayQueueEnum {

	ORDER_PAYMENT_TIMEOUT("ORDER_PAYMENT_TIMEOUT","訂單支付超時(shí)，自動(dòng)取消訂單", "orderPaymentTimeout"),
	ORDER_TIMEOUT_NOT_EVALUATED("ORDER_TIMEOUT_NOT_EVALUATED", "訂單超時(shí)未評(píng)價(jià)，系統(tǒng)默認(rèn)好評(píng)", "orderTimeoutNotEvaluated");

	/**
	 * 延遲隊(duì)列 Redis Key
	 */
	private String code;

	/**
	 * 中文描述
	 */
	private String name;

	/**
	 * 延遲隊(duì)列具體業(yè)務(wù)實(shí)現(xiàn)的 Bean
	 * 可通過(guò) Spring 的上下文獲取
	 */
	private String beanId;

}

6、定義延遲隊(duì)列執(zhí)行器

/**
 * 延遲隊(duì)列執(zhí)行器
 * Created by LPB on 2021/04/20.
 */
public interface RedisDelayQueueHandle<T> {

	void execute(T t);

}

7、創(chuàng)建枚舉中定義的Bean，并實(shí)現(xiàn)延遲隊(duì)列執(zhí)行器

• OrderPaymentTimeout：訂單支付超時(shí)延遲隊(duì)列處理類(lèi)

/**
 * 訂單支付超時(shí)處理類(lèi)
 * Created by LPB on 2021/04/20.
 */
@Component
@Slf4j
public class OrderPaymentTimeout implements RedisDelayQueueHandle<Map> {
	@Override
	public void execute(Map map) {
		log.info("(收到訂單支付超時(shí)延遲消息) {}", map);
		// TODO 訂單支付超時(shí)&#xff0c;自動(dòng)取消訂單處理業(yè)務(wù)...

	}
}

• DelayQueueProcessorForUnevaluatedOrders: 處理未評(píng)價(jià)訂單的延遲隊(duì)列處理類(lèi)，用于訂單超時(shí)未評(píng)價(jià)的情況

/**
 * 訂單超時(shí)未評(píng)價(jià)處理類(lèi)
 * Created by LPB on 2021/04/20.
 */
@Component
@Slf4j
public class OrderTimeoutNotEvaluated implements RedisDelayQueueHandle<Map> {
	@Override
	public void execute(Map map) {
		log.info("(收到訂單超時(shí)未評(píng)價(jià)延遲消息) {}", map);
		// TODO 訂單超時(shí)未評(píng)價(jià)&#xff0c;系統(tǒng)默認(rèn)好評(píng)處理業(yè)務(wù)...

	}
}

8、創(chuàng)建延遲隊(duì)列消費(fèi)線程，項(xiàng)目啟動(dòng)完成后開(kāi)啟

/**
 * 啟動(dòng)延遲隊(duì)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延遲隊(duì)列異常中斷) {}", e.getMessage());
				}
			}
		}).start();
		log.info("(Redis延遲隊(duì)列啟動(dòng)成功)");
	}
}

以上步驟，Redis 延遲隊(duì)列核心代碼已經(jīng)完成，下面我們寫(xiě)一個(gè)測(cè)試接口，用 PostMan 模擬測(cè)試一下

9、創(chuàng)建一個(gè)測(cè)試接口，模擬添加延遲隊(duì)列

/**
 * 延遲隊(duì)列測(cè)試
 * 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", "訂單支付超時(shí)&#xff0c;自動(dòng)取消訂單");

		Map<String, String> map2 = new HashMap<>();
		map2.put("orderId", "200");
		map2.put("remark", "訂單超時(shí)未評(píng)價(jià)&#xff0c;系統(tǒng)默認(rèn)好評(píng)");

		// 添加訂單支付超時(shí)&#xff0c;自動(dòng)取消訂單延遲隊(duì)列。為了測(cè)試效果&#xff0c;延遲10秒鐘
		redisDelayQueueUtil.addDelayQueue(map1, 10, TimeUnit.SECONDS, RedisDelayQueueEnum.ORDER_PAYMENT_TIMEOUT.getCode());

		// 訂單超時(shí)未評(píng)價(jià)&#xff0c;系統(tǒng)默認(rèn)好評(píng)。為了測(cè)試效果&#xff0c;延遲20秒鐘
		redisDelayQueueUtil.addDelayQueue(map2, 20, TimeUnit.SECONDS, RedisDelayQueueEnum.ORDER_TIMEOUT_NOT_EVALUATED.getCode());
	}

}

10、啟動(dòng) SpringBoot 項(xiàng)目，用 PostMan 調(diào)用接口添加延遲隊(duì)列

• 通過(guò) Redis 客戶端可看到兩個(gè)延遲隊(duì)列已添加成功

• 查看 IDEA 控制臺(tái)日志可看到延遲隊(duì)列已消費(fèi)成功

以上是SpringBoot怎么集成Redisson實(shí)現(xiàn)延遲隊(duì)列的詳細(xì)內(nèi)容。更多信息請(qǐng)關(guān)注PHP中文網(wǎng)其他相關(guān)文章！