1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 8141591
27 * @summary Tests if notifications are received after executor is shutdown
28 * @author Harsha Wardhana B
29 *
30 * @run clean ExecutorShutdownTest
31 * @run build ExecutorShutdownTest
32 * @run main ExecutorShutdownTest
33 */
34 import java.util.*;
35 import java.util.concurrent.*;
36 import javax.management.*;
37 import javax.management.remote.*;
38
39 /*
40 When you create a JMXConnector client, you can supply a
41 "fetch-notifications Executor", which is a
42 java.util.concurrent.Executor that will be used each time the
43 connector client wants to call RMIConnection.fetchNotifications.
44 If such executor is not supplies, the connector client will fallback
45 on default LinearExecutor. This test checks if user supplied executor
46 is shutdown abruptly, LinearExecutor is used to handle notifications.
47 */
48 public class ExecutorShutdownTest {
49
50 private static final String EXECUTOR_PROPERTY
51 = "jmx.remote.x.fetch.notifications.executor";
52 private static final String NOTIF_TYPE = "test.type";
53
54 public static void main(String[] args) throws Exception {
55
56 // Start JMXConnector Server
57 JMXServiceURL url = new JMXServiceURL("rmi", null, 0);
58 MBeanServer mbs = MBeanServerFactory.newMBeanServer();
59 ObjectName emitName = new ObjectName("blah:type=Emitter");
60 mbs.registerMBean(new Emitter(), emitName);
61 JMXConnectorServer cs = JMXConnectorServerFactory.newJMXConnectorServer(url,
62 null,
63 mbs);
64 cs.start();
65
66 // Create executor to provide to JMXConnector client
67 ExecutorService executor = Executors.newCachedThreadPool();
68 Map<String, Executor> env = new HashMap<>();
69 env.put(EXECUTOR_PROPERTY, executor);
70 JMXServiceURL addr = cs.getAddress();
71
72 try (JMXConnector cc = JMXConnectorFactory.connect(addr, env)) {
73 MBeanServerConnection mbsc = cc.getMBeanServerConnection();
74 EmitterMBean emitter = (EmitterMBean) MBeanServerInvocationHandler.newProxyInstance(mbsc,
75 emitName,
76 EmitterMBean.class,
77 false);
78 SemaphoreListener listener = new SemaphoreListener();
79 NotificationFilterSupport filter = new NotificationFilterSupport();
80 filter.enableType(NOTIF_TYPE);
81 mbsc.addNotificationListener(emitName, listener, filter, null);
82
83 final int NOTIF_COUNT = 3;
84 for (int i = 0; i < NOTIF_COUNT; i++) {
85 emitter.emit();
86 listener.await();
87 }
88 Thread.sleep(1);
89 listener.checkUnavailable();
90 System.out.println("Got notifications with client provided executor");
91
92 // After shutting down executor, notifications are handled by linear executor
93 executor.shutdown();
94 for (int i = 0; i < NOTIF_COUNT; i++) {
95 emitter.emit();
96 listener.await();
97 }
98 Thread.sleep(1);
99 listener.checkUnavailable();
100 System.out.println("Got notifications with linear executor");
101 }
102 cs.stop();
103 System.out.println("TEST PASSED !!!");
104 }
105
106 /* Simple MBean that sends a notification every time we ask it to. */
107 public static interface EmitterMBean {
108
109 public void emit();
110 }
111
112 public static class Emitter
113 extends NotificationBroadcasterSupport implements EmitterMBean {
114
115 public void emit() {
116 sendNotification(new Notification(NOTIF_TYPE, this, seq++));
117 }
118
119 private long seq = 1;
120 }
121
122 /* Simple NotificationListener that allows you to wait until a
123 notification has been received. Since it uses a semaphore, you
124 can wait either before or after the notification has in fact
125 been received and it will work in either case. */
126 private static class SemaphoreListener implements NotificationListener {
127
128 void await() throws InterruptedException {
129 semaphore.acquire();
130 }
131
132 /* Ensure no extra notifications were received. If we can acquire
133 the semaphore, that means its release() method was called more
134 times than its acquire() method, which means there were too
135 many notifications. */
136 void checkUnavailable() throws Exception {
137 if (semaphore.tryAcquire()) {
138 throw new Exception("Got extra notifications!");
139 }
140 }
141
142 public void handleNotification(Notification n, Object h) {
143 semaphore.release();
144 }
145
146 private final Semaphore semaphore = new Semaphore(0);
147 }
148 }