content: /*
   * Copyright 1999-2019 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
   *
   *      https://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.filters;
  
  import java.util.Deque;
  
  import com.alibaba.csp.sentinel.Entry;
  import com.alibaba.csp.sentinel.Tracer;
  import com.alibaba.csp.sentinel.adapter.gateway.zuul.constants.ZuulConstant;
  import com.alibaba.csp.sentinel.context.ContextUtil;
  
  import com.netflix.zuul.context.RequestContext;
  
  /**
   * @author Eric Zhao
   * @since 1.6.0
   */
  final class SentinelEntryUtils {
  
      @SuppressWarnings("unchecked")
      static void tryExitFromCurrentContext() {
          RequestContext ctx = RequestContext.getCurrentContext();
          if (ctx.containsKey(ZuulConstant.ZUUL_CTX_SENTINEL_ENTRIES_KEY)) {
              Deque<EntryHolder> holders = (Deque<EntryHolder>) ctx.get(ZuulConstant.ZUUL_CTX_SENTINEL_ENTRIES_KEY);
              EntryHolder holder;
              while (!holders.isEmpty()) {
                  holder = holders.pop();
                  exit(holder);
              }
              ctx.remove(ZuulConstant.ZUUL_CTX_SENTINEL_ENTRIES_KEY);
          }
  
          ContextUtil.exit();
      }
  
      @SuppressWarnings("unchecked")
      static void tryTraceExceptionThenExitFromCurrentContext(Throwable t) {
          RequestContext ctx = RequestContext.getCurrentContext();
          if (ctx.containsKey(ZuulConstant.ZUUL_CTX_SENTINEL_ENTRIES_KEY)) {
              Deque<EntryHolder> holders = (Deque<EntryHolder>) ctx.get(ZuulConstant.ZUUL_CTX_SENTINEL_ENTRIES_KEY);
              EntryHolder holder;
              while (!holders.isEmpty()) {
                  holder = holders.pop();
                  Tracer.traceEntry(t, holder.getEntry());
                  exit(holder);
              }
              ctx.remove(ZuulConstant.ZUUL_CTX_SENTINEL_ENTRIES_KEY);
          }
          ContextUtil.exit();
      }
  
      static void exit(EntryHolder holder) {
          Entry entry = holder.getEntry();
          entry.exit(1, holder.getParams());
      }
  
      private SentinelEntryUtils() {}
  }
  