| /* |
| * 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 |
| * |
| * https://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.tools.ant; |
| |
| import java.io.IOException; |
| import java.net.ServerSocket; |
| |
| /** |
| * As the name suggests, utility class used in tests |
| */ |
| public class TestHelper { |
| |
| /** |
| * Find a TCP/IP port which may continue to be available. |
| * <br /> |
| * The returned port is available since a socket has successfully bind to it, but this availability is not ensured |
| * after this method since the associated socket is released and some other process can now use it. |
| */ |
| public static int getMaybeAvailablePort() { |
| try (ServerSocket s = new ServerSocket(0)) { |
| s.setReuseAddress(true); |
| return s.getLocalPort(); |
| } catch (IOException e) { |
| // ignore |
| } |
| throw new IllegalStateException("No TCP/IP port available"); |
| } |
| } |