/*
 * 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 org.apache.fluo.core.util;

import java.io.IOException;
import java.net.ServerSocket;
import java.util.concurrent.ThreadLocalRandom;

public class PortUtils {

  private PortUtils() {}

  public static int getRandomFreePort() {
    var r = ThreadLocalRandom.current();
    int count = 0;

    while (count < 13) {
      int port = r.nextInt((1 << 16) - 1024) + 1024;

      try (ServerSocket so = new ServerSocket(port)) {
        so.setReuseAddress(true);
        return port;
      } catch (IOException e) {
        // ignore
      }
    }

    throw new RuntimeException("Unable to find port");
  }
}
