content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alipay.api.config.filter.annotation.aop;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  /**
   * Rate limiting annotation for API endpoints
   * Uses sliding window algorithm to control request frequency
   * 
   * @author jietian
   * @version 1.0
   * @since 2024
   */
  @Retention(RetentionPolicy.RUNTIME)
  @Target(ElementType.METHOD)
  public @interface RateLimit {
      
      /**
       * Maximum number of requests allowed per time window
       * Default: 10 requests
       */
      int maxRequests() default 10;
      
      /**
       * Time window in seconds
       * Default: 60 seconds (1 minute)
       */
      int timeWindowSeconds() default 60;
      
      /**
       * Rate limiting key strategy
       * IP: limit by client IP address
       * USER: limit by authenticated user ID
       * GLOBAL: global rate limiting for all requests
       * Default: IP
       */
      KeyStrategy keyStrategy() default KeyStrategy.IP;
      
      /**
       * Custom error message when rate limit is exceeded
       * Default: "Too many requests, please try again later"
       */
      String message() default "Too many requests, please try again later";
      
      /**
       * Key strategy enumeration
       */
      enum KeyStrategy {
          IP,     // Rate limit by IP address
          USER,   // Rate limit by user ID
          GLOBAL  // Global rate limit
      }
  }