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.dubbo.fallback;
  
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  import com.alibaba.dubbo.rpc.Invocation;
  import com.alibaba.dubbo.rpc.Invoker;
  import com.alibaba.dubbo.rpc.Result;
  
  /**
   * Fallback handler for Dubbo services.
   *
   * @author Eric Zhao
   */
  public interface DubboFallback {
  
      /**
       * Handle the block exception and provide fallback result.
       *
       * @param invoker Dubbo invoker
       * @param invocation Dubbo invocation
       * @param ex block exception
       * @return fallback result
       */
      Result handle(Invoker<?> invoker, Invocation invocation, BlockException ex);
  }
  