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.io.IOException;
  import java.net.BindException;
  import java.net.InetSocketAddress;
  
  import org.apache.zookeeper.server.NIOServerCnxnFactory;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class ZookeeperServerCnxnFactory {
      private static final Logger LOG = LoggerFactory.getLogger(ZookeeperServerCnxnFactory.class);
      int _port;
      NIOServerCnxnFactory _factory;
  
      public ZookeeperServerCnxnFactory(int port, int maxClientCnxns) {
          // port range
          int max;
          if (port <= 0) {
              _port = 2000;
              max = 65535;
          } else {
              _port = port;
              max = port;
          }
  
          try {
              _factory = new NIOServerCnxnFactory();
          } catch (IOException e) {
              _port = 0;
              _factory = null;
              e.printStackTrace();
              throw new RuntimeException(e.getMessage());
          }
  
          // look for available port
          for (; _port <= max; _port++) {
              try {
                  _factory.configure(new InetSocketAddress(_port), maxClientCnxns);
                  LOG.debug("Zookeeper server successfully binded at port " + _port);
                  break;
              } catch (BindException e1) {
              } catch (IOException e2) {
                  _port = 0;
                  _factory = null;
                  e2.printStackTrace();
                  throw new RuntimeException(e2.getMessage());
              }
          }
  
          if (_port > max) {
              _port = 0;
              _factory = null;
              LOG.error("Failed to find a port for Zookeeper");
              throw new RuntimeException("No port is available to launch an inprocess zookeeper.");
          }
      }
  
      public int port() {
          return _port;
      }
  
      public NIOServerCnxnFactory factory() {
          return _factory;
      }
  }
  