| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import javax.management.MBeanServerConnection; |
| import javax.management.Notification; |
| import javax.management.NotificationListener; |
| import javax.management.ObjectName; |
| import javax.management.remote.JMXConnectionNotification; |
| import javax.management.remote.JMXConnector; |
| import javax.management.remote.JMXConnectorFactory; |
| import javax.management.remote.JMXServiceURL; |
| |
| public class Client { |
| public static void run(String url) throws Exception { |
| final int notifEmittedCnt = 10; |
| final CountDownLatch counter = new CountDownLatch(notifEmittedCnt); |
| final Set<Long> seqSet = Collections.synchronizedSet(new HashSet<Long>()); |
| final AtomicBoolean duplNotification = new AtomicBoolean(); |
| |
| JMXServiceURL serverUrl = new JMXServiceURL(url); |
| |
| ObjectName name = new ObjectName("test", "foo", "bar"); |
| JMXConnector jmxConnector = JMXConnectorFactory.connect(serverUrl); |
| System.out.println("client connected"); |
| jmxConnector.addConnectionNotificationListener(new NotificationListener() { |
| @Override |
| public void handleNotification(Notification notification, Object handback) { |
| System.out.println("connection notification: " + notification); |
| if (!seqSet.add(notification.getSequenceNumber())) { |
| duplNotification.set(true); |
| } |
| if (notification.getType().equals(JMXConnectionNotification.NOTIFS_LOST)) { |
| long lostNotifs = ((Long)((JMXConnectionNotification)notification).getUserData()).longValue(); |
| for(int i=0;i<lostNotifs;i++) { |
| counter.countDown(); |
| } |
| } |
| } |
| }, null, null); |
| MBeanServerConnection jmxServer = jmxConnector.getMBeanServerConnection(); |
| |
| jmxServer.addNotificationListener(name, new NotificationListener() { |
| @Override |
| public void handleNotification(Notification notification, Object handback) { |
| System.out.println("client got: " + notification); |
| if (!seqSet.add(notification.getSequenceNumber())) { |
| duplNotification.set(true); |
| } |
| counter.countDown(); |
| } |
| }, null, null); |
| |
| System.out.println("client invoking foo (" + notifEmittedCnt + " times)"); |
| for(int i=0;i<notifEmittedCnt;i++) { |
| System.out.print("."); |
| jmxServer.invoke(name, "foo", new Object[]{}, new String[]{}); |
| } |
| System.out.println(); |
| try { |
| System.out.println("waiting for " + notifEmittedCnt + " notifications to arrive"); |
| if (!counter.await(30, TimeUnit.SECONDS)) { |
| throw new InterruptedException(); |
| } |
| if (duplNotification.get()) { |
| System.out.println("ERROR: received duplicated notifications"); |
| throw new Error("received duplicated notifications"); |
| } |
| System.out.println("\nshutting down client"); |
| } catch (InterruptedException e) { |
| System.out.println("ERROR: notification processing thread interrupted"); |
| throw new Error("notification thread interrupted unexpectedly"); |
| } |
| } |
| } |