001/*-------------------------------------------------------------------------+
002|                                                                          |
003| Copyright 2005-2011 The ConQAT Project                                   |
004|                                                                          |
005| Licensed under the Apache License, Version 2.0 (the "License");          |
006| you may not use this file except in compliance with the License.         |
007| You may obtain a copy of the License at                                  |
008|                                                                          |
009|    http://www.apache.org/licenses/LICENSE-2.0                            |
010|                                                                          |
011| Unless required by applicable law or agreed to in writing, software      |
012| distributed under the License is distributed on an "AS IS" BASIS,        |
013| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
014| See the License for the specific language governing permissions and      |
015| limitations under the License.                                           |
016+-------------------------------------------------------------------------*/
017package org.conqat.lib.commons.net;
018
019import java.io.IOException;
020import java.net.ServerSocket;
021
022/**
023 * Utility methods used in conjunction with sockets.
024 * 
025 * @author hummelb
026 */
027public class SocketUtils {
028
029        /** Checks whether the given TCP port is available. */
030        public static boolean isFreePort(int portNumber) {
031                try {
032                        ServerSocket socket = new ServerSocket(portNumber);
033                        socket.setReuseAddress(true);
034                        socket.close();
035                        return true;
036                } catch (IOException e) {
037                        return false;
038                }
039        }
040
041        /** Returns a new free TCP port number */
042        public static int getFreePort() throws IOException {
043                ServerSocket socket = new ServerSocket(0);
044                socket.setReuseAddress(true);
045                int result = socket.getLocalPort();
046                socket.close();
047                return result;
048        }
049
050}