code: // Licensed to the Software Freedom Conservancy (SFC) under one
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  // to you under the Apache License, Version 2.0 (the
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  //
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  package org.openqa.selenium.net;
  
  /**
   * Identifies the ephemeral port range for a given environment.
   *
   * <p>When trying to locate a "random" free port, it is important to not allocate within the
   * ephemeral range, since these can be allocated at any time, and the probability of race conditions
   * increases as the number of recently used ports increases, something which is quite common when
   * running the webdriver tests.
   */
  public interface EphemeralPortRangeDetector {
  
    /**
     * Returns the first port in the ephemeral range
     *
     * @return The first ephemeral port
     */
    int getLowestEphemeralPort();
  
    /**
     * Returns the last port that could be searched for free ports
     *
     * @return The first port that may be free
     */
    int getHighestEphemeralPort();
  }
  