Java Redisson多策略注解限流
作者:秋玻
这篇文章主要介绍了Java Redisson多策略注解限流,文章使用Redisson的RRateLimiter进行限流,详细介绍,感兴趣的小伙伴可以参考下面文章内容
前言
限流:使用Redisson的RRateLimiter进行限流多策略:map+函数式接口优化if判断
限流:使用Redisson的RRateLimiter进行限流
多策略:map+函数式接口优化if判断
自定义注解
/** * aop限流注解 */ @Target({ElementType.METHOD, ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Inherited @Documented public @interface RedisLimit { String prefix() default "rateLimit:"; //限流唯一标示 String key() default ""; //限流单位时间(单位为s) int time() default 1; //单位时间内限制的访问次数 int count(); //限流类型 LimitType type() default LimitType.CUSTOM; }
定义限流类型
public enum LimitType { /** * 自定义key */ CUSTOM, /** * 请求者IP */ IP, /** * 方法级别限流 * key = ClassName+MethodName */ METHOD, /** * 参数级别限流 * key = ClassName+MethodName+Params */ PARAMS, /** * 用户级别限流 * key = ClassName+MethodName+Params+UserId */ USER, /** * 根据request的uri限流 * key = Request_uri */ REQUEST_URI, /** * 对requesturi+userId限流 * key = Request_uri+UserId */ REQUESTURI_USERID, /** * 对userId限流 * key = userId */ SINGLEUSER, /** * 对方法限流 * key = ClassName+MethodName */ SINGLEMETHOD, /** * 对uri+params限流 * key = uri+params */ REQUEST_URI_PARAMS, /** * 对uri+params+userId限流 * key = uri+params+userId */ REQUEST_URI_PARAMS_USERID; }
生成key的工具类
根据类型生成锁的对象(key)的工具类,使用map+函数式接口优化if,其中BaseContext
是一个获取用户唯一标识userId的工具类
@Component public class ProceedingJoinPointUtil { @Autowired private HttpServletRequest request; private Map<LimitType, Function<ProceedingJoinPoint,String>> functionMap = new HashMap<>(9); @PostConstruct void initMap(){ //初始化策略 functionMap.put(LimitType.METHOD, this::getMethodTypeKey); functionMap.put(LimitType.PARAMS, this::getParamsTypeKey); functionMap.put(LimitType.USER, this::getUserTypeKey); functionMap.put(LimitType.REQUEST_URI,proceedingJoinPoint -> request.getRequestURI()); functionMap.put(LimitType.REQUESTURI_USERID, proceedingJoinPoint -> request.getRequestURI()+BaseContext.getUserId()); functionMap.put(LimitType.REQUEST_URI_PARAMS,proceedingJoinPoint -> request.getRequestURI()+getParams(proceedingJoinPoint)); functionMap.put(LimitType.REQUEST_URI_PARAMS_USERID,proceedingJoinPoint -> request.getRequestURI()+getParams(proceedingJoinPoint)+BaseContext.getUserId()); functionMap.put(LimitType.SINGLEUSER,(proceedingJoinPoint)-> String.valueOf(BaseContext.getUserId())); functionMap.put(LimitType.SINGLEMETHOD,(proceedingJoinPoint -> { StringBuilder sb = new StringBuilder(); appendMthodName(proceedingJoinPoint,sb); return sb.toString(); })); } public Object getKey(ProceedingJoinPoint joinPoint, RedisLimit redisLimit) { //根据限制类型生成key Object generateKey = ""; //自定义 if(redisLimit.type() != LimitType.CUSTOM){ generateKey = generateKey(redisLimit.type(), joinPoint); }else { //非自定义 generateKey = redisLimit.key(); } return generateKey; } /** * 根据LimitType生成key * @param type * @param joinPoint * @return */ private Object generateKey(LimitType type , ProceedingJoinPoint joinPoint) { Function function = functionMap.get(type); Object result = function.apply(joinPoint); return result; } /** * 方法级别 * key = ClassName+MethodName * @param joinPoint * @return */ private String getMethodTypeKey(ProceedingJoinPoint joinPoint){ StringBuilder sb = new StringBuilder(); appendMthodName(joinPoint, sb); return sb.toString(); } /** * 参数级别 * key = ClassName+MethodName+Params * @param joinPoint * @return */ private String getParamsTypeKey(ProceedingJoinPoint joinPoint){ StringBuilder sb = new StringBuilder(); appendMthodName(joinPoint, sb); appendParams(joinPoint, sb); return sb.toString(); } /** * 用户级别 * key = ClassName+MethodName+Params+UserId */ private String getUserTypeKey(ProceedingJoinPoint joinPoint){ StringBuilder sb = new StringBuilder(); appendMthodName(joinPoint, sb); appendParams(joinPoint, sb); //获取userId appendUserId(sb); return sb.toString(); } /** * StringBuilder添加类名和方法名 * @param joinPoint * @param sb */ private void appendMthodName(ProceedingJoinPoint joinPoint, StringBuilder sb) { Signature signature = joinPoint.getSignature(); MethodSignature methodSignature = (MethodSignature) signature; Method method = methodSignature.getMethod(); sb.append(joinPoint.getTarget().getClass().getName())//类名 .append(method.getName());//方法名 } /** * StringBuilder添加方法参数值 * @param joinPoint * @param sb */ private void appendParams(ProceedingJoinPoint joinPoint, StringBuilder sb) { for (Object o : joinPoint.getArgs()) { sb.append(o.toString()); } } private String getParams(ProceedingJoinPoint joinPoint) { StringBuilder sb = new StringBuilder(); for (Object o : joinPoint.getArgs()) { if(o instanceof MultipartFile){ try { ImageTypeCheck.getImgHeightAndWidth(((MultipartFile) o).getInputStream()); } catch (IOException e) { throw new BusinessException("MultipartFile输入流获取失败,source:ProceedingJoinPointUtils.149",USER_PRINCIPAL_EMAIL); } }else { sb.append(o.toString()); } } return sb.toString(); } /** * StringBuilder添加UserId * @param sb */ private void appendUserId(StringBuilder sb) { sb.append(BaseContext.getUserId()); } }
定义aop具体逻辑
@Aspect @Component @Slf4j public class RedisLimitAspect { @Autowired private RedissonClient redissonClient; @Autowired private ProceedingJoinPointUtil proceedingJoinPointUtil; @Pointcut("@annotation(com.cat.www.aop.limit.anno.RedisLimit)") private void pointCut() { } @Around("pointCut() && @annotation(redisLimit)") private Object around(ProceedingJoinPoint joinPoint, RedisLimit redisLimit) { Object generateKey = proceedingJoinPointUtil.getKey(joinPoint, redisLimit); //redis key String key = redisLimit.prefix() +generateKey.toString(); //声明一个限流器 RRateLimiter rateLimiter = redissonClient.getRateLimiter(key); //设置速率,time秒中产生count个令牌 rateLimiter.trySetRate(RateType.OVERALL, redisLimit.count(), redisLimit.time(), RateIntervalUnit.SECONDS); // 试图获取一个令牌,获取到返回true boolean tryAcquire = rateLimiter.tryAcquire(); if (!tryAcquire) { return new ResultData<>().FAILED().setResultIns("访问过于频繁"); } Object obj = null; try { obj = joinPoint.proceed(); } catch (Throwable e) { throw new RuntimeException(); } return obj; } }
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