| /** |
| * 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.camel.testng; |
| |
| import java.io.IOException; |
| import java.net.DatagramSocket; |
| import java.net.ServerSocket; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * Finds currently available server ports. |
| */ |
| public final class AvailablePortFinder { |
| |
| /** |
| * The minimum server currentMinPort number for IPv4. |
| * Set at 1100 to avoid returning privileged currentMinPort numbers. |
| */ |
| public static final int MIN_PORT_NUMBER = 1100; |
| |
| /** |
| * The maximum server currentMinPort number for IPv4. |
| */ |
| public static final int MAX_PORT_NUMBER = 65535; |
| |
| /** |
| * Creates a new instance. |
| */ |
| private AvailablePortFinder() { |
| // Do nothing |
| } |
| |
| /** |
| * Gets the next available port starting at the lowest port number. |
| * |
| * @throws NoSuchElementException if there are no ports available |
| */ |
| public static int getNextAvailable() { |
| return getNextAvailable(MIN_PORT_NUMBER); |
| } |
| |
| /** |
| * Gets the next available port starting at a port. |
| * |
| * @param fromPort the port to scan for availability |
| * @throws NoSuchElementException if there are no ports available |
| */ |
| public static int getNextAvailable(int fromPort) { |
| if (fromPort < MIN_PORT_NUMBER || fromPort > MAX_PORT_NUMBER) { |
| throw new IllegalArgumentException("Invalid start port: " + fromPort); |
| } |
| |
| for (int i = fromPort; i <= MAX_PORT_NUMBER; i++) { |
| if (available(i)) { |
| return i; |
| } |
| } |
| |
| throw new NoSuchElementException("Could not find an available port above " + fromPort); |
| } |
| |
| /** |
| * Checks to see if a specific port is available. |
| * |
| * @param port the port to check for availability |
| */ |
| public static boolean available(int port) { |
| if (port < MIN_PORT_NUMBER || port > MAX_PORT_NUMBER) { |
| throw new IllegalArgumentException("Invalid start port: " + port); |
| } |
| |
| ServerSocket ss = null; |
| DatagramSocket ds = null; |
| try { |
| ss = new ServerSocket(port); |
| ss.setReuseAddress(true); |
| ds = new DatagramSocket(port); |
| ds.setReuseAddress(true); |
| return true; |
| } catch (IOException e) { |
| // Do nothing |
| } finally { |
| if (ds != null) { |
| ds.close(); |
| } |
| |
| if (ss != null) { |
| try { |
| ss.close(); |
| } catch (IOException e) { |
| /* should not be thrown */ |
| } |
| } |
| } |
| |
| return false; |
| } |
| } |