| /* |
| * 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.ignite.internal.util.portscanner; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.net.InetAddress; |
| import java.net.ServerSocket; |
| import java.net.UnknownHostException; |
| import java.nio.channels.FileLock; |
| import org.apache.ignite.IgniteSystemProperties; |
| import org.apache.ignite.SystemProperty; |
| |
| /** |
| * Ignite port scanner. |
| */ |
| public class GridJmxPortFinder { |
| /** Environment variable for overriding JMX port. */ |
| @SystemProperty(value = "JMX port", type = Integer.class) |
| public static final String IGNITE_JMX_PORT = "IGNITE_JMX_PORT"; |
| |
| /** Minimum port number. */ |
| private static final int MIN_PORT = 49112; |
| |
| /** Maximum port number. */ |
| private static final int MAX_PORT = 65535; |
| |
| /** |
| * Private constructor. |
| */ |
| private GridJmxPortFinder() { |
| // No-op. |
| } |
| |
| /** |
| * Makes a search of available port. Start port is taken from temp file, it is |
| * then replaced with newly found port. |
| * |
| * @param args Program arguments. |
| */ |
| public static void main(String[] args) { |
| try { |
| InetAddress.getLocalHost(); |
| } |
| catch (UnknownHostException ignored) { |
| // If the above call fails than JMX wouldn't start. |
| // Do not return anything to signal inability to run JMX. |
| return; |
| } |
| |
| int jmxPort = IgniteSystemProperties.getInteger(IGNITE_JMX_PORT, -1); |
| |
| if (jmxPort != -1) { |
| System.out.println(jmxPort); |
| |
| return; |
| } |
| |
| RandomAccessFile ra = null; |
| FileLock lock = null; |
| |
| try { |
| File file = new File(System.getProperty("java.io.tmpdir"), "ignite.lastport.tmp"); |
| |
| file.setReadable(true, false); |
| file.setWritable(true, false); |
| |
| ra = new RandomAccessFile(file, "rw"); |
| |
| lock = ra.getChannel().lock(); |
| |
| ra.seek(0); |
| |
| String startPortStr = ra.readLine(); |
| |
| int startPort = MIN_PORT; |
| |
| if (startPortStr != null && !startPortStr.isEmpty()) { |
| try { |
| startPort = Integer.valueOf(startPortStr) + 1; |
| |
| if (startPort < MIN_PORT || startPort > MAX_PORT) |
| startPort = MIN_PORT; |
| } |
| catch (NumberFormatException ignored) { |
| // Ignore, just use default lower bound port. |
| } |
| } |
| |
| int port = findPort(startPort); |
| |
| ra.setLength(0); |
| |
| ra.writeBytes(String.valueOf(port)); |
| |
| // Ack the port for others to read... |
| System.out.println(port); |
| } |
| catch (IOException ignored) { |
| // Do not return anything to signal inability to run JMX. |
| } |
| finally { |
| if (lock != null) |
| try { |
| lock.release(); |
| } |
| catch (IOException ignored) { |
| // No-op. |
| } |
| |
| if (ra != null) |
| try { |
| ra.close(); |
| } |
| catch (IOException ignored) { |
| // No-op. |
| } |
| } |
| } |
| |
| /** |
| * Finds first available port beginning from start port up to {@link GridJmxPortFinder#MAX_PORT}. |
| * |
| * @param startPort Start Port number. |
| * @return Available port number, or 0 if no available port found. |
| */ |
| private static int findPort(int startPort) { |
| for (int port = startPort; port <= MAX_PORT; port++) { |
| if (isAvailable(port)) |
| return port; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Checks whether port is available. |
| * |
| * @param port Port number. |
| * @return {@code true} if port is available. |
| */ |
| private static boolean isAvailable(int port) { |
| ServerSocket sock = null; |
| |
| try { |
| sock = new ServerSocket(port); |
| |
| return true; |
| } |
| catch (IOException ignored) { |
| return false; |
| } |
| finally { |
| if (sock != null) { |
| try { |
| sock.close(); |
| } |
| catch (IOException ignored) { |
| // No-op |
| // Could we leave it unavailable here? Possible "return false;". |
| } |
| } |
| } |
| } |
| } |