content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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.alibaba.csp.sentinel.adapter.gateway.zuul.fallback;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import com.alibaba.csp.sentinel.util.AssertUtil;
  
  /**
   * This provide fall back class manager.
   *
   * @author tiger
   */
  public class ZuulBlockFallbackManager {
  
      private static Map<String, ZuulBlockFallbackProvider> fallbackProviderCache = new HashMap<>();
  
      private static ZuulBlockFallbackProvider defaultFallbackProvider = new DefaultBlockFallbackProvider();
  
      /**
       * Register special provider for different route.
       */
      public static synchronized void registerProvider(ZuulBlockFallbackProvider provider) {
          AssertUtil.notNull(provider, "fallback provider cannot be null");
          String route = provider.getRoute();
          if ("*".equals(route) || route == null) {
              defaultFallbackProvider = provider;
          } else {
              fallbackProviderCache.put(route, provider);
          }
      }
  
      public static ZuulBlockFallbackProvider getFallbackProvider(String route) {
          ZuulBlockFallbackProvider provider = fallbackProviderCache.get(route);
          if (provider == null) {
              provider = defaultFallbackProvider;
          }
          return provider;
      }
  
      public synchronized static void clear(){
          fallbackProviderCache.clear();
      }
  
  }
  