content: /*
   * Copyright 1999-2023 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.nacos.core.context;
  
  import java.util.function.Supplier;
  
  /**
   * Holder for request context for each worker thread.
   *
   * @author xiweng.yy
   */
  public class RequestContextHolder {
  
      private static final Supplier<RequestContext> REQUEST_CONTEXT_FACTORY = () -> {
          long requestTimestamp = System.currentTimeMillis();
          return new RequestContext(requestTimestamp);
      };
      
      private static final ThreadLocal<RequestContext> CONTEXT_HOLDER = ThreadLocal.withInitial(REQUEST_CONTEXT_FACTORY);
      
      public static RequestContext getContext() {
          return CONTEXT_HOLDER.get();
      }
      
      public static void removeContext() {
          CONTEXT_HOLDER.remove();
      }
  }
  