| /* |
| * Copyright (c) 2016, 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. |
| * |
| * 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. |
| */ |
| |
| /* |
| * @test |
| * @bug 8141591 |
| * @summary Tests if notifications are received after executor is shutdown |
| * @author Harsha Wardhana B |
| * |
| * @run clean ExecutorShutdownTest |
| * @run build ExecutorShutdownTest |
| * @run main ExecutorShutdownTest |
| */ |
| import java.util.*; |
| import java.util.concurrent.*; |
| import javax.management.*; |
| import javax.management.remote.*; |
| |
| /* |
| When you create a JMXConnector client, you can supply a |
| "fetch-notifications Executor", which is a |
| java.util.concurrent.Executor that will be used each time the |
| connector client wants to call RMIConnection.fetchNotifications. |
| If such executor is not supplies, the connector client will fallback |
| on default LinearExecutor. This test checks if user supplied executor |
| is shutdown abruptly, LinearExecutor is used to handle notifications. |
| */ |
| public class ExecutorShutdownTest { |
| |
| private static final String EXECUTOR_PROPERTY |
| = "jmx.remote.x.fetch.notifications.executor"; |
| private static final String NOTIF_TYPE = "test.type"; |
| |
| public static void main(String[] args) throws Exception { |
| |
| // Start JMXConnector Server |
| JMXServiceURL url = new JMXServiceURL("rmi", null, 0); |
| MBeanServer mbs = MBeanServerFactory.newMBeanServer(); |
| ObjectName emitName = new ObjectName("blah:type=Emitter"); |
| mbs.registerMBean(new Emitter(), emitName); |
| JMXConnectorServer cs = JMXConnectorServerFactory.newJMXConnectorServer(url, |
| null, |
| mbs); |
| cs.start(); |
| |
| // Create executor to provide to JMXConnector client |
| ExecutorService executor = Executors.newCachedThreadPool(); |
| Map<String, Executor> env = new HashMap<>(); |
| env.put(EXECUTOR_PROPERTY, executor); |
| JMXServiceURL addr = cs.getAddress(); |
| |
| try (JMXConnector cc = JMXConnectorFactory.connect(addr, env)) { |
| MBeanServerConnection mbsc = cc.getMBeanServerConnection(); |
| EmitterMBean emitter = (EmitterMBean) MBeanServerInvocationHandler.newProxyInstance(mbsc, |
| emitName, |
| EmitterMBean.class, |
| false); |
| SemaphoreListener listener = new SemaphoreListener(); |
| NotificationFilterSupport filter = new NotificationFilterSupport(); |
| filter.enableType(NOTIF_TYPE); |
| mbsc.addNotificationListener(emitName, listener, filter, null); |
| |
| final int NOTIF_COUNT = 3; |
| for (int i = 0; i < NOTIF_COUNT; i++) { |
| emitter.emit(); |
| listener.await(); |
| } |
| Thread.sleep(1); |
| listener.checkUnavailable(); |
| System.out.println("Got notifications with client provided executor"); |
| |
| // After shutting down executor, notifications are handled by linear executor |
| executor.shutdown(); |
| for (int i = 0; i < NOTIF_COUNT; i++) { |
| emitter.emit(); |
| listener.await(); |
| } |
| Thread.sleep(1); |
| listener.checkUnavailable(); |
| System.out.println("Got notifications with linear executor"); |
| } |
| cs.stop(); |
| System.out.println("TEST PASSED !!!"); |
| } |
| |
| /* Simple MBean that sends a notification every time we ask it to. */ |
| public static interface EmitterMBean { |
| |
| public void emit(); |
| } |
| |
| public static class Emitter |
| extends NotificationBroadcasterSupport implements EmitterMBean { |
| |
| public void emit() { |
| sendNotification(new Notification(NOTIF_TYPE, this, seq++)); |
| } |
| |
| private long seq = 1; |
| } |
| |
| /* Simple NotificationListener that allows you to wait until a |
| notification has been received. Since it uses a semaphore, you |
| can wait either before or after the notification has in fact |
| been received and it will work in either case. */ |
| private static class SemaphoreListener implements NotificationListener { |
| |
| void await() throws InterruptedException { |
| semaphore.acquire(); |
| } |
| |
| /* Ensure no extra notifications were received. If we can acquire |
| the semaphore, that means its release() method was called more |
| times than its acquire() method, which means there were too |
| many notifications. */ |
| void checkUnavailable() throws Exception { |
| if (semaphore.tryAcquire()) { |
| throw new Exception("Got extra notifications!"); |
| } |
| } |
| |
| public void handleNotification(Notification n, Object h) { |
| semaphore.release(); |
| } |
| |
| private final Semaphore semaphore = new Semaphore(0); |
| } |
| } |