1 /* 2 * Copyright (c) 2012-2023, jcabi.com 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 1) Redistributions of source code must retain the above 8 * copyright notice, this list of conditions and the following 9 * disclaimer. 2) Redistributions in binary form must reproduce the above 10 * copyright notice, this list of conditions and the following 11 * disclaimer in the documentation and/or other materials provided 12 * with the distribution. 3) Neither the name of the jcabi.com nor 13 * the names of its contributors may be used to endorse or promote 14 * products derived from this software without specific prior written 15 * permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT 19 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 28 * OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 package com.jcabi.mysql.maven.plugin; 31 32 import java.io.IOException; 33 import java.net.Socket; 34 35 /** 36 * Extracted static helper function into its own class to reduce class 37 * complexity of Instances (TooManyMethods). 38 * 39 * <p>The class is thread-safe. 40 * @since 0.6 41 */ 42 final class SocketHelper { 43 44 /** 45 * Utility class should not be instantiated. 46 */ 47 private SocketHelper() { } 48 49 /** 50 * Port is open. 51 * @param port The port to check 52 * @return TRUE if it's open 53 */ 54 static boolean isOpen(final int port) { 55 boolean open; 56 try { 57 new Socket((String) null, port); 58 open = true; 59 } catch (final IOException ex) { 60 open = false; 61 } 62 return open; 63 } 64 65 }