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.slotchain;
  
  import com.alibaba.csp.sentinel.context.Context;
  
  /**
   * @author qinan.qn
   * @author jialiang.linjl
   */
  public class DefaultProcessorSlotChain extends ProcessorSlotChain {
  
      AbstractLinkedProcessorSlot<?> first = new AbstractLinkedProcessorSlot<Object>() {
  
          @Override
          public void entry(Context context, ResourceWrapper resourceWrapper, Object t, int count, boolean prioritized, Object... args)
              throws Throwable {
              super.fireEntry(context, resourceWrapper, t, count, prioritized, args);
          }
  
          @Override
          public void exit(Context context, ResourceWrapper resourceWrapper, int count, Object... args) {
              super.fireExit(context, resourceWrapper, count, args);
          }
  
      };
      AbstractLinkedProcessorSlot<?> end = first;
  
      @Override
      public void addFirst(AbstractLinkedProcessorSlot<?> protocolProcessor) {
          protocolProcessor.setNext(first.getNext());
          first.setNext(protocolProcessor);
          if (end == first) {
              end = protocolProcessor;
          }
      }
  
      @Override
      public void addLast(AbstractLinkedProcessorSlot<?> protocolProcessor) {
          end.setNext(protocolProcessor);
          end = protocolProcessor;
      }
  
      /**
       * Same as {@link #addLast(AbstractLinkedProcessorSlot)}.
       *
       * @param next processor to be added.
       */
      @Override
      public void setNext(AbstractLinkedProcessorSlot<?> next) {
          addLast(next);
      }
  
      @Override
      public AbstractLinkedProcessorSlot<?> getNext() {
          return first.getNext();
      }
  
      @Override
      public void entry(Context context, ResourceWrapper resourceWrapper, Object t, int count, boolean prioritized, Object... args)
          throws Throwable {
          first.transformEntry(context, resourceWrapper, t, count, prioritized, args);
      }
  
      @Override
      public void exit(Context context, ResourceWrapper resourceWrapper, int count, Object... args) {
          first.exit(context, resourceWrapper, count, args);
      }
  
  }
  