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/*
* Copyright (c) 2004, 2024, 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.
*/
package nsk.monitoring.MemoryNotificationInfo.from;
import java.lang.management.*;
import javax.management.*;
import javax.management.openmbean.*;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.TimeUnit;
import nsk.share.*;
import nsk.share.gc.Algorithms;
import nsk.share.gc.Memory;
import nsk.share.gc.gp.GarbageUtils;
import nsk.monitoring.share.*;
import nsk.share.test.Stresser;
public class from001 {
private static boolean testFailed = false;
private static final int MAX_TRIES = 6; // limit attempts to receive Notification data
public static void main(String[] args) {
ArgumentHandler argHandler = new ArgumentHandler(args);
Log log = new Log(System.out, argHandler);
log.display("MemoryNotificationInfo/from/from001/from001.java test started.");
MemoryMonitor monitor = Monitor.getMemoryMonitor(log, argHandler);
MBeanServer mbs = Monitor.getMBeanServer();
// 1. Check null CompositeData - null must be returned
MemoryNotificationInfo result = MemoryNotificationInfo.from(null);
if (result != null) {
log.complain("FAILURE 1.");
log.complain("MemoryNotificationInfo.from(null) returned " + result
+ ", expected: null.");
testFailed = true;
}
log.display("null CompositeData check passed.");
// 2. Check CompositeData that does not represent MemoryNotificationInfo
// throws IllegalArgumentException
ObjectName mbeanObjectName = null;
CompositeData cdata = null;
try {
mbeanObjectName = new ObjectName(ManagementFactory.MEMORY_MXBEAN_NAME);
cdata = (CompositeData )mbs.getAttribute(mbeanObjectName,
"HeapMemoryUsage");
} catch (Exception e) {
log.complain("Unexpected exception " + e);
e.printStackTrace(log.getOutStream());
testFailed = true;
}
try {
result = MemoryNotificationInfo.from(cdata);
log.complain("FAILURE 2.");
log.complain("MemoryNotificationInfo.from(CompositeData) returned "
+ result + ", expected: IllegalArgumentException.");
testFailed = true;
} catch (IllegalArgumentException e) {
// Expected: CompositeData does not represent MemoryNotificationInfo
}
log.display("check that CompositeData does not represent MemoryNotificationInfo passed.");
// 3. Check correct CompositeData usage:
// First try to provoke a Notification on a MemoryPool.
Object poolObject = null;
try {
mbeanObjectName = new ObjectName(ManagementFactory.MEMORY_MXBEAN_NAME);
mbs.addNotificationListener(mbeanObjectName, new from001Listener(),
null, null);
List<?> pools = monitor.getMemoryPoolMBeans();
if (pools.isEmpty()) {
log.complain("No Memory Pool Beans found. Test case will hang/fail.");
testFailed = true;
}
for (int i = 0; i < pools.size(); i++) {
Object pool = pools.get(i);
if (monitor.isUsageThresholdSupported(pool)) {
if (monitor.getType(pool).equals(MemoryType.HEAP)) {
poolObject = pool;
monitor.setUsageThreshold(pool, 1);
log.display("Usage threshold set for pool :" + poolObject);
break;
}
}
}
} catch (Exception e) {
log.complain("Unexpected exception " + e);
e.printStackTrace(log.getOutStream());
testFailed = true;
}
if (testFailed) {
throw new TestFailure("TEST FAILED. See log.");
}
if (poolObject == null) {
throw new TestFailure("No memory pool found to test.");
}
// eat memory just to emit notification
Stresser stresser = new Stresser(args) {
@Override
public boolean continueExecution() {
return from001Listener.data.get() == null
&& super.continueExecution();
}
};
stresser.start(0);// we use timeout, not iterations
int oomCount = GarbageUtils.eatMemory(stresser);
log.display("eatMemory returns OOM count: " + oomCount);
// Check for the message. Poll on queue to avoid waiting forver on failure.
// Notification is known to fail, very rarely, with -Xcomp where the allocations
// do not affect the monitored pool. Possibly a timing issue, where the "eatMemory"
// is done before Notification/threshold processing happens.
// The Notification is quite immediate, other than that problem.
boolean messageReceived = false;
int tries = 0;
while (!messageReceived && ++tries < MAX_TRIES) {
try {
Object r = from001Listener.queue.poll(10000, TimeUnit.MILLISECONDS);
if (r == null) {
log.display("poll for Notification data returns null...");
continue;
} else {
messageReceived = true;
break;
}
} catch (InterruptedException e) {
// ignored, continue
}
}
// If we got a Notification, test that the CompositeData can create a MemoryNotificationInfo
if (!messageReceived) {
throw new TestFailure("No Notification received.");
}
result = MemoryNotificationInfo.from(from001Listener.data.get());
try {
ObjectName poolObjectName = new ObjectName(monitor.getName(poolObject));
ObjectName resultObjectName = new ObjectName(
ManagementFactory.MEMORY_POOL_MXBEAN_DOMAIN_TYPE +
",name=" + result.getPoolName());
log.display("poolObjectName : " + poolObjectName +
" resultObjectName : " + resultObjectName);
if (!poolObjectName.equals(resultObjectName)) {
log.complain("FAILURE 3.");
log.complain("Wrong pool name : " + resultObjectName +
", expected : " + poolObjectName);
testFailed = true;
}
} catch (Exception e) {
log.complain("Unexpected exception " + e);
e.printStackTrace(log.getOutStream());
testFailed = true;
}
if (testFailed) {
throw new TestFailure("TEST FAILED. See log.");
}
log.display("Test passed.");
}
}
class from001Listener implements NotificationListener {
static AtomicReference<CompositeData> data = new AtomicReference<CompositeData>();
static SynchronousQueue<Object> queue = new SynchronousQueue<Object>();
public void handleNotification(Notification notification, Object handback) {
if (data.get() != null) {
System.out.println("handleNotification: ignoring");
return;
}
System.out.println("handleNotification: getting data");
CompositeData d = (CompositeData) notification.getUserData();
data.set(d);
boolean messageNotSent = true;
while(messageNotSent){
try {
queue.put(new Object());
messageNotSent = false;
} catch(InterruptedException e) {
// ignore, retry
}
}
}
}
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