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 backtype.storm.utils;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.LinkedBlockingQueue;
  
  public class InprocMessaging {
      private static Map<Integer, LinkedBlockingQueue<Object>> _queues = new HashMap<>();
      private static final Object _lock = new Object();
      private static int port = 1;
  
      public static int acquireNewPort() {
          int ret;
          synchronized (_lock) {
              ret = port;
              port++;
          }
          return ret;
      }
  
      public static void sendMessage(int port, Object msg) {
          getQueue(port).add(msg);
      }
  
      public static Object takeMessage(int port) throws InterruptedException {
          return getQueue(port).take();
      }
  
      public static Object pollMessage(int port) {
          return getQueue(port).poll();
      }
  
      private static LinkedBlockingQueue<Object> getQueue(int port) {
          synchronized (_lock) {
              if (!_queues.containsKey(port)) {
                  _queues.put(port, new LinkedBlockingQueue<>());
              }
              return _queues.get(port);
          }
      }
  
  }
  