| /* |
| * 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.sling.maven.kickstart.run; |
| |
| import org.apache.maven.plugin.MojoExecutionException; |
| |
| import java.io.IOException; |
| import java.net.ServerSocket; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * Simple helper class to find a new port. |
| */ |
| public class PortHelper { |
| |
| private static final Set<Integer> USED_PORTS = new HashSet<Integer>(); |
| |
| public static synchronized int getNextAvailablePort() |
| throws MojoExecutionException { |
| int unusedPort = 0; |
| do { |
| try { |
| final ServerSocket socket = new ServerSocket( 0 ); |
| unusedPort = socket.getLocalPort(); |
| socket.close(); |
| } catch ( final IOException e ) { |
| throw new MojoExecutionException( "Error getting an available port from system", e ); |
| } |
| } while ( USED_PORTS.contains(unusedPort)); |
| USED_PORTS.add(unusedPort); |
| |
| return unusedPort; |
| } |
| } |