20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.management.jdp;
  26 
  27 import java.io.IOException;
  28 import java.net.InetAddress;
  29 import java.net.UnknownHostException;
  30 import java.util.UUID;
  31 
  32 import java.lang.management.ManagementFactory;
  33 import java.lang.management.RuntimeMXBean;
  34 import java.lang.reflect.Field;
  35 import java.lang.reflect.Method;
  36 import sun.management.VMManagement;
  37 import sun.misc.ManagedLocalsThread;
  38 
  39 /**
  40  * JdpController is responsible to create and manage a broadcast loop
  41  *
  42  * <p> Other part of code has no access to broadcast loop and have to use
  43  * provided static methods
  44  * {@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService}
  45  * and {@link #stopDiscoveryService() stopDiscoveryService}</p>
  46  * <p>{@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService} could be called multiple
  47  * times as it stops the running service if it is necessary. Call to {@link #stopDiscoveryService() stopDiscoveryService}
  48  * ignored if service isn't run</p>

  49  *
  50  *
  51  * </p>
  52  *
  53  * <p> System properties below could be used to control broadcast loop behavior.
  54  * Property below have to be set explicitly in command line. It's not possible to
  55  * set it in management.config file.  Careless changes of these properties could
  56  * lead to security or network issues.
  57  * <ul>
  58  *     <li>com.sun.management.jdp.ttl         - set ttl for broadcast packet</li>
  59  *     <li>com.sun.management.jdp.pause       - set broadcast interval in seconds</li>
  60  *     <li>com.sun.management.jdp.source_addr - an address of interface to use for broadcast</li>
  61  * </ul>
  62   </p>
  63  * <p>null parameters values are filtered out on {@link JdpPacketWriter} level and
  64  * corresponding keys are not placed to packet.</p>
  65  */
  66 public final class JdpController {
  67 
  68     private static class JDPControllerRunner implements Runnable {
  69 
  70         private final JdpJmxPacket packet;
  71         private final JdpBroadcaster bcast;
  72         private final int pause;
  73         private volatile boolean shutdown = false;
  74 
  75         private JDPControllerRunner(JdpBroadcaster bcast, JdpJmxPacket packet, int pause) {
  76             this.bcast = bcast;
  77             this.packet = packet;
  78             this.pause = pause;
  79         }
  80 
  81         @Override
  82         public void run() {
  83             try {
  84                 while (!shutdown) {

  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.management.jdp;
  26 
  27 import java.io.IOException;
  28 import java.net.InetAddress;
  29 import java.net.UnknownHostException;
  30 import java.util.UUID;
  31 
  32 import java.lang.management.ManagementFactory;
  33 import java.lang.management.RuntimeMXBean;
  34 import java.lang.reflect.Field;
  35 import java.lang.reflect.Method;
  36 import sun.management.VMManagement;
  37 import sun.misc.ManagedLocalsThread;
  38 
  39 /**
  40  * JdpController is responsible to create and manage a broadcast loop.
  41  *
  42  * <p> Other part of code has no access to broadcast loop and have to use
  43  * provided static methods
  44  * {@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService}
  45  * and {@link #stopDiscoveryService() stopDiscoveryService}
  46  * <p>{@link #startDiscoveryService(InetAddress,int,String,String) startDiscoveryService} could be called multiple
  47  * times as it stops the running service if it is necessary.
  48  * Call to {@link #stopDiscoveryService() stopDiscoveryService}
  49  * ignored if service isn't run.
  50  *
  51  *


  52  * <p> System properties below could be used to control broadcast loop behavior.
  53  * Property below have to be set explicitly in command line. It's not possible to
  54  * set it in management.config file.  Careless changes of these properties could
  55  * lead to security or network issues.
  56  * <ul>
  57  *     <li>com.sun.management.jdp.ttl         - set ttl for broadcast packet</li>
  58  *     <li>com.sun.management.jdp.pause       - set broadcast interval in seconds</li>
  59  *     <li>com.sun.management.jdp.source_addr - an address of interface to use for broadcast</li>
  60  * </ul>
  61  *
  62  * <p>null parameters values are filtered out on {@link JdpPacketWriter} level and
  63  * corresponding keys are not placed to packet.
  64  */
  65 public final class JdpController {
  66 
  67     private static class JDPControllerRunner implements Runnable {
  68 
  69         private final JdpJmxPacket packet;
  70         private final JdpBroadcaster bcast;
  71         private final int pause;
  72         private volatile boolean shutdown = false;
  73 
  74         private JDPControllerRunner(JdpBroadcaster bcast, JdpJmxPacket packet, int pause) {
  75             this.bcast = bcast;
  76             this.packet = packet;
  77             this.pause = pause;
  78         }
  79 
  80         @Override
  81         public void run() {
  82             try {
  83                 while (!shutdown) {