author | chegar |
Mon, 18 Apr 2016 20:58:19 +0100 | |
changeset 37518 | cd27455e4276 |
parent 30655 | d83f50188ca9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.management.jdp; |
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import java.io.IOException; |
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import java.net.InetAddress; |
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import java.net.UnknownHostException; |
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import java.util.UUID; |
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import java.lang.management.ManagementFactory; |
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import java.lang.management.RuntimeMXBean; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.Method; |
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import sun.management.VMManagement; |
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/** |
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* JdpController is responsible to create and manage a broadcast loop. |
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* |
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* <p> Other part of code has no access to broadcast loop and have to use |
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* provided static methods |
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* {@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService} |
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* and {@link #stopDiscoveryService() stopDiscoveryService} |
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* <p>{@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService} could be called multiple |
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* times as it stops the running service if it is necessary. |
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* Call to {@link #stopDiscoveryService() stopDiscoveryService} |
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* ignored if service isn't run. |
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* |
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* |
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* <p> System properties below could be used to control broadcast loop behavior. |
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* Property below have to be set explicitly in command line. It's not possible to |
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* set it in management.config file. Careless changes of these properties could |
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* lead to security or network issues. |
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* <ul> |
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* <li>com.sun.management.jdp.ttl - set ttl for broadcast packet</li> |
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* <li>com.sun.management.jdp.pause - set broadcast interval in seconds</li> |
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* <li>com.sun.management.jdp.source_addr - an address of interface to use for broadcast</li> |
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* </ul> |
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* |
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* <p>null parameters values are filtered out on {@link JdpPacketWriter} level and |
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* corresponding keys are not placed to packet. |
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*/ |
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public final class JdpController { |
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private static class JDPControllerRunner implements Runnable { |
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private final JdpJmxPacket packet; |
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private final JdpBroadcaster bcast; |
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private final int pause; |
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private volatile boolean shutdown = false; |
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private JDPControllerRunner(JdpBroadcaster bcast, JdpJmxPacket packet, int pause) { |
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this.bcast = bcast; |
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this.packet = packet; |
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this.pause = pause; |
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} |
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@Override |
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public void run() { |
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try { |
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while (!shutdown) { |
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bcast.sendPacket(packet); |
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try { |
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Thread.sleep(this.pause); |
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} catch (InterruptedException e) { |
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// pass |
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} |
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} |
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} catch (IOException e) { |
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// pass; |
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} |
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// It's not possible to re-use controller, |
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// nevertheless reset shutdown variable |
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try { |
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stop(); |
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bcast.shutdown(); |
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} catch (IOException ex) { |
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// pass - ignore IOException during shutdown |
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} |
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} |
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public void stop() { |
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shutdown = true; |
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} |
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} |
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private static JDPControllerRunner controller = null; |
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private JdpController(){ |
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// Don't allow to instantiate this class. |
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} |
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// Utility to handle optional system properties |
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// Parse an integer from string or return default if provided string is null |
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private static int getInteger(String val, int dflt, String msg) throws JdpException { |
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try { |
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return (val == null) ? dflt : Integer.parseInt(val); |
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} catch (NumberFormatException ex) { |
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throw new JdpException(msg); |
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} |
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} |
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// Parse an inet address from string or return default if provided string is null |
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private static InetAddress getInetAddress(String val, InetAddress dflt, String msg) throws JdpException { |
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try { |
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return (val == null) ? dflt : InetAddress.getByName(val); |
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} catch (UnknownHostException ex) { |
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throw new JdpException(msg); |
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} |
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} |
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// Get the process id of the current running Java process |
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private static Integer getProcessId() { |
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try { |
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// Get the current process id using a reflection hack |
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RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean(); |
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Field jvm = runtime.getClass().getDeclaredField("jvm"); |
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jvm.setAccessible(true); |
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|
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VMManagement mgmt = (sun.management.VMManagement) jvm.get(runtime); |
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Method pid_method = mgmt.getClass().getDeclaredMethod("getProcessId"); |
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pid_method.setAccessible(true); |
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Integer pid = (Integer) pid_method.invoke(mgmt); |
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return pid; |
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} catch(Exception ex) { |
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return null; |
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} |
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} |
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/** |
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* Starts discovery service |
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* |
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* @param address - multicast group address |
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* @param port - udp port to use |
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* @param instanceName - name of running JVM instance |
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* @param url - JMX service url |
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* @throws IOException |
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*/ |
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public static synchronized void startDiscoveryService(InetAddress address, int port, String instanceName, String url) |
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throws IOException, JdpException { |
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|
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// Limit packet to local subnet by default |
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int ttl = getInteger( |
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System.getProperty("com.sun.management.jdp.ttl"), 1, |
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"Invalid jdp packet ttl"); |
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|
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// Broadcast once a 5 seconds by default |
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int pause = getInteger( |
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System.getProperty("com.sun.management.jdp.pause"), 5, |
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"Invalid jdp pause"); |
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|
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// Converting seconds to milliseconds |
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pause = pause * 1000; |
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|
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// Allow OS to choose broadcast source |
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InetAddress sourceAddress = getInetAddress( |
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System.getProperty("com.sun.management.jdp.source_addr"), null, |
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"Invalid source address provided"); |
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|
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// Generate session id |
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UUID id = UUID.randomUUID(); |
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|
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JdpJmxPacket packet = new JdpJmxPacket(id, url); |
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|
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// Don't broadcast whole command line for security reason. |
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// Strip everything after first space |
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String javaCommand = System.getProperty("sun.java.command"); |
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if (javaCommand != null) { |
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String[] arr = javaCommand.split(" ", 2); |
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packet.setMainClass(arr[0]); |
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} |
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|
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// Put optional explicit java instance name to packet, if user doesn't specify |
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// it the key is skipped. PacketWriter is responsible to skip keys having null value. |
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packet.setInstanceName(instanceName); |
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|
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// Set rmi server hostname if it explicitly specified by user with |
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// java.rmi.server.hostname |
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String rmiHostname = System.getProperty("java.rmi.server.hostname"); |
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packet.setRmiHostname(rmiHostname); |
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|
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// Set broadcast interval |
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packet.setBroadcastInterval(Integer.toString(pause)); |
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|
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// Set process id |
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Integer pid = getProcessId(); |
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if (pid != null) { |
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packet.setProcessId(pid.toString()); |
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} |
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JdpBroadcaster bcast = new JdpBroadcaster(address, sourceAddress, port, ttl); |
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|
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// Stop discovery service if it's already running |
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stopDiscoveryService(); |
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|
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controller = new JDPControllerRunner(bcast, packet, pause); |
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|
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Thread t = new Thread(null, controller, "JDP broadcaster", 0, false); |
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t.setDaemon(true); |
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t.start(); |
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} |
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|
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/** |
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* Stop running discovery service, |
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* it's safe to attempt to stop not started service |
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*/ |
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public static synchronized void stopDiscoveryService() { |
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if ( controller != null ){ |
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controller.stop(); |
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controller = null; |
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} |
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} |
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} |