Method pickUnusedPort

benchmarks/src/main/java/io/grpc/benchmarks/Utils.java:292–301

Picks a port that is not used right at this moment. Warning: Not thread safe. May see "BindException: Address already in use: bind" if using the returned port to create a new server socket when other threads/processes are concurrently creating new sockets without a specific port.

()

   * creating new sockets without a specific port.
   */
  public static int pickUnusedPort() {
    try {
      ServerSocket serverSocket = new ServerSocket(0);
      int port = serverSocket.getLocalPort();
      serverSocket.close();
      return port;
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
}