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/*
* Copyright (c) 2008, 2020, 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 6692027
* @summary Check that custom subclasses of QueryEval can be serialized.
* @author Eamonn McManus
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.management.ManagementFactory;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.QueryEval;
import javax.management.QueryExp;
public class CustomQueryTest {
public static interface CountMBean {
public int getCount();
public void increment();
}
public static class Count implements CountMBean {
private AtomicInteger count = new AtomicInteger();
public int getCount() {
return count.get();
}
public void increment() {
count.incrementAndGet();
}
}
public static final ObjectName countName;
static {
try {
countName = new ObjectName("d:type=Count");
} catch (MalformedObjectNameException e) {
throw new AssertionError(e);
}
}
/* A query that calls the increment method of the Count MBean every time
* it is evaluated. If there is no ObjectName filter, the query will be
* evaluated for every MBean in the MBean Server, so the count will be
* incremented by the number of MBeans.
*/
public static class IncrQuery extends QueryEval implements QueryExp {
public boolean apply(ObjectName name) {
try {
getMBeanServer().invoke(countName, "increment", null, null);
return true;
} catch (Throwable t) {
t.printStackTrace();
System.exit(1);
throw new AssertionError(); // not reached
}
}
}
public static void main(String[] args) throws Exception {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
boolean isSecondAttempt = false;
// The test may fail if some new MBean is registered while the test
// is running (e.g. Graal MBean). In this case just retry the test.
while (true) {
mbs.registerMBean(new Count(), countName);
int mbeanCount = mbs.getMBeanCount();
QueryExp query = new IncrQuery();
Set<ObjectName> names = mbs.queryNames(null, query);
assertEquals(mbeanCount, names.size());
assertEquals(mbeanCount, mbs.getAttribute(countName, "Count"));
ByteArrayOutputStream bout = new ByteArrayOutputStream();
ObjectOutputStream oout = new ObjectOutputStream(bout);
oout.writeObject(query);
oout.close();
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
ObjectInputStream oin = new ObjectInputStream(bin);
query = (QueryExp) oin.readObject();
names = mbs.queryNames(null, query);
int counterCount = (int)mbs.getAttribute(countName, "Count");
if (mbeanCount * 2 == counterCount) {
break;
}
if (isSecondAttempt) {
assertEquals(mbeanCount * 2, counterCount);
break;
}
isSecondAttempt = true;
System.out.println("New MBean was registered. Retrying...");
mbs.unregisterMBean(countName);
}
}
private static void assertEquals(Object expected, Object actual)
throws Exception {
if (!expected.equals(actual)) {
String failure = "FAILED: expected " + expected + ", got " + actual;
throw new Exception(failure);
}
}
}
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