content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master;
  
  import alluxio.AbstractResourceRule;
  
  import com.google.common.base.Preconditions;
  
  /**
   * Rule for reserving a port during a test. Other tests will not attempt to use this port.
   */
  public class PortReservationRule extends AbstractResourceRule {
    private int mPort = -1;
  
    @Override
    public void before() {
      mPort = PortRegistry.reservePort();
    }
  
    @Override
    public void after() {
      PortRegistry.release(mPort);
      mPort = -1;
    }
  
    public int getPort() {
      Preconditions.checkState(mPort >= 0,
          "cannot call getPort() before the rule has been activated");
      return mPort;
    }
  }
  