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.cluster.client.handler;
  
  import java.util.AbstractMap.SimpleEntry;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import com.alibaba.csp.sentinel.cluster.response.ClusterResponse;
  
  import io.netty.channel.ChannelPromise;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  public final class TokenClientPromiseHolder {
  
      private static final Map<Integer, SimpleEntry<ChannelPromise, ClusterResponse>> PROMISE_MAP = new ConcurrentHashMap<>();
  
      public static void putPromise(int xid, ChannelPromise promise) {
          PROMISE_MAP.put(xid, new SimpleEntry<ChannelPromise, ClusterResponse>(promise, null));
      }
  
      public static SimpleEntry<ChannelPromise, ClusterResponse> getEntry(int xid) {
          return PROMISE_MAP.get(xid);
      }
  
      public static void remove(int xid) {
          PROMISE_MAP.remove(xid);
      }
  
      public static <T> boolean completePromise(int xid, ClusterResponse<T> response) {
          if (!PROMISE_MAP.containsKey(xid)) {
              return false;
          }
          SimpleEntry<ChannelPromise, ClusterResponse> entry = PROMISE_MAP.get(xid);
          if (entry != null) {
              ChannelPromise promise = entry.getKey();
              if (promise.isDone() || promise.isCancelled()) {
                  return false;
              }
              entry.setValue(response);
              promise.setSuccess();
              return true;
          }
          return false;
      }
  
      private TokenClientPromiseHolder() {}
  }
  