--- a/jdk/src/java.management/share/classes/sun/management/jdp/JdpController.java Fri Feb 03 09:28:13 2017 -0800
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,236 +0,0 @@
-/*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package sun.management.jdp;
-
-import java.io.IOException;
-import java.net.InetAddress;
-import java.net.UnknownHostException;
-import java.util.UUID;
-
-import java.lang.management.ManagementFactory;
-import java.lang.management.RuntimeMXBean;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import sun.management.VMManagement;
-
-/**
- * JdpController is responsible to create and manage a broadcast loop.
- *
- * <p> Other part of code has no access to broadcast loop and have to use
- * provided static methods
- * {@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService}
- * and {@link #stopDiscoveryService() stopDiscoveryService}
- * <p>{@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService} could be called multiple
- * times as it stops the running service if it is necessary.
- * Call to {@link #stopDiscoveryService() stopDiscoveryService}
- * ignored if service isn't run.
- *
- *
- * <p> System properties below could be used to control broadcast loop behavior.
- * Property below have to be set explicitly in command line. It's not possible to
- * set it in management.config file. Careless changes of these properties could
- * lead to security or network issues.
- * <ul>
- * <li>com.sun.management.jdp.ttl - set ttl for broadcast packet</li>
- * <li>com.sun.management.jdp.pause - set broadcast interval in seconds</li>
- * <li>com.sun.management.jdp.source_addr - an address of interface to use for broadcast</li>
- * </ul>
- *
- * <p>null parameters values are filtered out on {@link JdpPacketWriter} level and
- * corresponding keys are not placed to packet.
- */
-public final class JdpController {
-
- private static class JDPControllerRunner implements Runnable {
-
- private final JdpJmxPacket packet;
- private final JdpBroadcaster bcast;
- private final int pause;
- private volatile boolean shutdown = false;
-
- private JDPControllerRunner(JdpBroadcaster bcast, JdpJmxPacket packet, int pause) {
- this.bcast = bcast;
- this.packet = packet;
- this.pause = pause;
- }
-
- @Override
- public void run() {
- try {
- while (!shutdown) {
- bcast.sendPacket(packet);
- try {
- Thread.sleep(this.pause);
- } catch (InterruptedException e) {
- // pass
- }
- }
-
- } catch (IOException e) {
- // pass;
- }
-
- // It's not possible to re-use controller,
- // nevertheless reset shutdown variable
- try {
- stop();
- bcast.shutdown();
- } catch (IOException ex) {
- // pass - ignore IOException during shutdown
- }
- }
-
- public void stop() {
- shutdown = true;
- }
- }
- private static JDPControllerRunner controller = null;
-
- private JdpController(){
- // Don't allow to instantiate this class.
- }
-
- // Utility to handle optional system properties
- // Parse an integer from string or return default if provided string is null
- private static int getInteger(String val, int dflt, String msg) throws JdpException {
- try {
- return (val == null) ? dflt : Integer.parseInt(val);
- } catch (NumberFormatException ex) {
- throw new JdpException(msg);
- }
- }
-
- // Parse an inet address from string or return default if provided string is null
- private static InetAddress getInetAddress(String val, InetAddress dflt, String msg) throws JdpException {
- try {
- return (val == null) ? dflt : InetAddress.getByName(val);
- } catch (UnknownHostException ex) {
- throw new JdpException(msg);
- }
- }
-
- // Get the process id of the current running Java process
- private static Integer getProcessId() {
- try {
- // Get the current process id using a reflection hack
- RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
- Field jvm = runtime.getClass().getDeclaredField("jvm");
- jvm.setAccessible(true);
-
- VMManagement mgmt = (sun.management.VMManagement) jvm.get(runtime);
- Method pid_method = mgmt.getClass().getDeclaredMethod("getProcessId");
- pid_method.setAccessible(true);
- Integer pid = (Integer) pid_method.invoke(mgmt);
- return pid;
- } catch(Exception ex) {
- return null;
- }
- }
-
-
- /**
- * Starts discovery service
- *
- * @param address - multicast group address
- * @param port - udp port to use
- * @param instanceName - name of running JVM instance
- * @param url - JMX service url
- * @throws IOException
- */
- public static synchronized void startDiscoveryService(InetAddress address, int port, String instanceName, String url)
- throws IOException, JdpException {
-
- // Limit packet to local subnet by default
- int ttl = getInteger(
- System.getProperty("com.sun.management.jdp.ttl"), 1,
- "Invalid jdp packet ttl");
-
- // Broadcast once a 5 seconds by default
- int pause = getInteger(
- System.getProperty("com.sun.management.jdp.pause"), 5,
- "Invalid jdp pause");
-
- // Converting seconds to milliseconds
- pause = pause * 1000;
-
- // Allow OS to choose broadcast source
- InetAddress sourceAddress = getInetAddress(
- System.getProperty("com.sun.management.jdp.source_addr"), null,
- "Invalid source address provided");
-
- // Generate session id
- UUID id = UUID.randomUUID();
-
- JdpJmxPacket packet = new JdpJmxPacket(id, url);
-
- // Don't broadcast whole command line for security reason.
- // Strip everything after first space
- String javaCommand = System.getProperty("sun.java.command");
- if (javaCommand != null) {
- String[] arr = javaCommand.split(" ", 2);
- packet.setMainClass(arr[0]);
- }
-
- // Put optional explicit java instance name to packet, if user doesn't specify
- // it the key is skipped. PacketWriter is responsible to skip keys having null value.
- packet.setInstanceName(instanceName);
-
- // Set rmi server hostname if it explicitly specified by user with
- // java.rmi.server.hostname
- String rmiHostname = System.getProperty("java.rmi.server.hostname");
- packet.setRmiHostname(rmiHostname);
-
- // Set broadcast interval
- packet.setBroadcastInterval(Integer.toString(pause));
-
- // Set process id
- Integer pid = getProcessId();
- if (pid != null) {
- packet.setProcessId(pid.toString());
- }
-
- JdpBroadcaster bcast = new JdpBroadcaster(address, sourceAddress, port, ttl);
-
- // Stop discovery service if it's already running
- stopDiscoveryService();
-
- controller = new JDPControllerRunner(bcast, packet, pause);
-
- Thread t = new Thread(null, controller, "JDP broadcaster", 0, false);
- t.setDaemon(true);
- t.start();
- }
-
- /**
- * Stop running discovery service,
- * it's safe to attempt to stop not started service
- */
- public static synchronized void stopDiscoveryService() {
- if ( controller != null ){
- controller.stop();
- controller = null;
- }
- }
-}