content: /*
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.cloudapp.seata.demo;
  
  import java.util.Collections;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  public class ResultHolder {
      
      private static final Map<String, Map<String, Object>> map =
              new ConcurrentHashMap<>();
      
      /**
       * save result
       * @param xid transaction id
       * @param key key
       * @param value value
       */
      public static void setResult(String xid, String key, Object value) {
          if (map.get(xid) == null) {
              synchronized (map) {
                  if (map.get(xid) == null) {
                      Map<String, Object> results = new ConcurrentHashMap<>();
                      map.put(xid, results);
                  }
              }
          }
          
          map.get(xid).put(key, value);
      }
      
      /**
       * get result value by key
       * @param xid transaction id
       * @param key key
       * @return result
       */
      public static Object getResult(String xid, String key) {
          Map<String, Object> results = map.getOrDefault(
                  xid, Collections.emptyMap());
          
          return results.get(key);
      }
      
      public static void removeResult(String xid, String key) {
          Map<String, Object> results = map.get(xid);
          if (results != null) {
              results.remove(key);
          }
      }
      
      public static void removeResult(String xid) {
          map.remove(xid);
      }
      
  }
  