| /* |
| * 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.slider.common.tools; |
| |
| import org.apache.slider.common.SliderExitCodes; |
| import org.apache.slider.core.exceptions.SliderException; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.TreeSet; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * |
| */ |
| public class PortScanner { |
| private static Pattern NUMBER_RANGE = Pattern.compile("^(\\d+)\\s*-\\s*(\\d+)$"); |
| private static Pattern SINGLE_NUMBER = Pattern.compile("^\\d+$"); |
| |
| private List<Integer> remainingPortsToCheck; |
| |
| public PortScanner() { |
| } |
| |
| public void setPortRange(String input) { |
| // first split based on commas |
| Set<Integer> inputPorts= new TreeSet<Integer>(); |
| String[] ranges = input.split(","); |
| for ( String range : ranges ) { |
| Matcher m = SINGLE_NUMBER.matcher(range.trim()); |
| if (m.find()) { |
| inputPorts.add(Integer.parseInt(m.group())); |
| } else { |
| m = NUMBER_RANGE.matcher(range.trim()); |
| if (m.find()) { |
| String[] boundaryValues = m.group(0).split("-"); |
| int start = Integer.parseInt(boundaryValues[0].trim()); |
| int end = Integer.parseInt(boundaryValues[1].trim()); |
| for (int i = start; i < end + 1; i++) { |
| inputPorts.add(i); |
| } |
| } |
| } |
| } |
| this.remainingPortsToCheck = new ArrayList<Integer>(inputPorts); |
| } |
| |
| public List<Integer> getRemainingPortsToCheck() { |
| return remainingPortsToCheck; |
| } |
| |
| public int getAvailablePort () throws SliderException{ |
| boolean found = false; |
| int availablePort = -1; |
| Iterator<Integer> portsToCheck = this.remainingPortsToCheck.iterator(); |
| while (portsToCheck.hasNext() && !found) { |
| int portToCheck = portsToCheck.next(); |
| found = SliderUtils.isPortAvailable(portToCheck); |
| if (found) { |
| availablePort = portToCheck; |
| portsToCheck.remove(); |
| } |
| } |
| |
| if (availablePort < 0) { |
| throw new SliderException(SliderExitCodes.EXIT_BAD_CONFIGURATION, |
| "No available ports found in configured range {}", |
| remainingPortsToCheck); |
| } |
| |
| return availablePort; |
| } |
| } |