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這篇文章主要介紹“基于Spring Aop環繞通知如何實現Redis緩存雙刪功能”,在日常操作中,相信很多人在基于Spring Aop環繞通知如何實現Redis緩存雙刪功能問題上存在疑惑,小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”基于Spring Aop環繞通知如何實現Redis緩存雙刪功能”的疑惑有所幫助!接下來,請跟著小編一起來學習吧!
結構示意圖:
自定義注解 RedisDelByDbUpdate
@Repeatable 表示允許在同一個地方上使用相同的注解,沒有該注解時貼相同注解會報錯
@Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) @Documented @Repeatable(RedisDelByDbUpdateList.class) public @interface RedisDelByDbUpdate { /** * 具體操作得緩存前綴 */ String redisPrefix() default ""; /** * 具體的緩存名稱,為空則刪除 redisPrefix 下的所有緩存 */ String fieldName() default ""; }
自定義注解 RedisDelByUpdateList
@Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface RedisDelByDbUpdateList { RedisDelByDbUpdate[] value(); }
具體實現 redis 雙刪邏輯
@Aspect @Component @Slf4j public class RedisDelAspect_bak { //環繞增強 @Autowired private RedisUtil redis; @Pointcut("@annotation(com.cili.baseserver.aop.annotation.RedisDelByDbUpdate) " + "|| @annotation(com.cili.baseserver.aop.annotation.RedisDelByDbUpdateList)") public void pointCut() { } // 線程池定長設置:最佳線程數目 = ((線程等待時間+線程CPU時間)/線程CPU時間 )* CPU數目 ScheduledExecutorService threadPool = Executors.newScheduledThreadPool(26); /** * 環繞增強 * * @param point * @return * @throws Throwable */ @Around("pointCut()") public Object around(ProceedingJoinPoint point) throws Throwable { MethodSignature signature = (MethodSignature) point.getSignature(); Method method = signature.getMethod(); RedisDelByDbUpdate redisDelByDbUpdate = method.getAnnotation(RedisDelByDbUpdate.class); if (redisDelByDbUpdate != null) { return singleRedisDel(redisDelByDbUpdate, point); } RedisDelByDbUpdateList updateList = method.getAnnotation(RedisDelByDbUpdateList.class); return arraysRedisDel(updateList, point); } private Object singleRedisDel(RedisDelByDbUpdate redisDelByDbUpdate, ProceedingJoinPoint point) throws Throwable { return handle(redisDelByDbUpdate, point, new IObjectCallback<Object>() { public <T> T callback() throws Throwable { return (T) point.proceed(); } }); } private Object arraysRedisDel(RedisDelByDbUpdateList updateList, ProceedingJoinPoint point) throws Throwable { RedisDelByDbUpdate[] redisDelByDbUpdates = updateList.value(); for (int i = 0; i < redisDelByDbUpdates.length; i++) { boolean flag = i == redisDelByDbUpdates.length - 1 ? true : false; Object obj = handle(redisDelByDbUpdates[i], point, new IObjectCallback<Object>() { public <T> T callback() throws Throwable { return flag ? (T) point.proceed() : null; } }); if (flag) return obj; } return null; } private Object handle(RedisDelByDbUpdate redisDelByDbUpdate, ProceedingJoinPoint point, IObjectCallback<Object> object) throws Throwable { String prefix = redisDelByDbUpdate.redisPrefix(); String fieldName = redisDelByDbUpdate.fieldName(); if (ValueUtil.isEmpty(prefix)) { log.info("redis緩存前綴不能為空"); throw new BizException(BaseResponseCode.SYSTEM_BUSY); } Object arg = point.getArgs()[0]; String key = ""; String[] redisKeys = null; if (ValueUtil.isNotEmpty(fieldName)) { if (arg instanceof ArrayList) { redisKeys = ((ArrayList<?>) arg).stream().map(item -> prefix + item).toArray(String[]::new); } else { Map<String, Object> map = (Map<String, Object>) JsonUtil.toMap(JsonUtil.toJSON(point.getArgs()[0])); key = map.get(fieldName).toString(); } } else { // 獲取所有該前綴下緩存 Set<String> keys = redis.keys(prefix + "*"); redisKeys = keys.stream().toArray(String[]::new); } // 刪除緩存 String redisKey = prefix + key; delete(redisKey, redisKeys); Object result = object.callback(); // 延時刪除 try { String[] finalRedisKeys = redisKeys; threadPool.schedule(new Runnable() { @Override public void run() { delete(redisKey, finalRedisKeys); } }, 500, TimeUnit.MILLISECONDS); } catch (Exception e) { log.error("線程池延時刪除緩存失敗:{}", redisKey); } return result; } private void delete(String redisKey, String[] redisKeys) { if (ValueUtil.isEmpty(redisKeys)) { redis.delete(redisKey); return; } redis.del(redisKeys); } }
注解使用示例
public class Test { @Override @RedisDelByDbUpdate(redisPrefix = RedisConstant.BANNER, fieldName = "ids") @RedisDelByDbUpdate(redisPrefix = RedisConstant.BANNER_LIST) public void batchDeleted(List<String> ids) throws BizException { if (CollectionUtils.isEmpty(ids)) { log.info("banner ID 不能為空"); throw new BizException(BaseResponseCode.PARAM_IS_NOT_NULL); } try { bannerMapper.batchDeleted(ids); } catch (Exception e) { log.error("==>批量刪除Banner錯誤:{}<==", e); throw new BizException(BaseResponseCode.SYSTEM_BUSY); } } }
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