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/*
* Copyright (c) 2007, 2015, 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 6546089
* @summary Basic unit test of MemoryPoolMXBean.isUsageThresholdExceeded() and
* MemoryPoolMXBean.isCollectionThresholdExceeded().
* @author Mandy Chung
*
* @run main/othervm ThresholdTest
*/
import java.lang.management.*;
import java.util.*;
public class ThresholdTest {
public static void main(String args[]) throws Exception {
long[] bigObject = new long[1000000];
System.gc(); // force an initial full-gc
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
try {
for (MemoryPoolMXBean p : pools) {
// verify if isUsageThresholdExceeded() returns correct value
checkUsageThreshold(p);
// verify if isCollectionUsageThresholdExceeded() returns correct value
checkCollectionUsageThreshold(p);
}
} finally {
// restore the default
for (MemoryPoolMXBean p : pools) {
if (p.isUsageThresholdSupported()) {
p.setUsageThreshold(0);
}
if (p.isCollectionUsageThresholdSupported()) {
p.setCollectionUsageThreshold(0);
}
}
}
System.out.println("Test passed.");
}
private static void checkUsageThreshold(MemoryPoolMXBean p) throws Exception {
if (!p.isUsageThresholdSupported()) {
return;
}
long threshold = p.getUsageThreshold();
if (threshold != 0) {
// Expect the default threshold is zero (disabled)
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" has non-zero threshold (" + threshold);
}
// isUsageThresholdExceeded() should return false if threshold == 0
if (p.isUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isUsageThresholdExceeded() returned true" +
" but threshold = 0");
}
p.setUsageThreshold(1);
// force a full gc to minimize the likelihood of running GC
// between getting the usage and checking the threshold
System.gc();
MemoryUsage u = p.getUsage();
if (u.getUsed() >= 1) {
if (!p.isUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isUsageThresholdExceeded() returned false but " +
" threshold(" + p.getUsageThreshold() +
") <= used(" + u.getUsed() + ")");
}
} else {
if (p.isUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isUsageThresholdExceeded() returned true but" +
" threshold(" + p.getUsageThreshold() +
") > used(" + u.getUsed() + ")");
}
}
// disable low memory detection and isUsageThresholdExceeded()
// should return false
p.setUsageThreshold(0);
if (p.isUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isUsageThresholdExceeded() returned true but threshold = 0");
}
}
private static void checkCollectionUsageThreshold(MemoryPoolMXBean p) throws Exception {
if (!p.isCollectionUsageThresholdSupported()) {
return;
}
long threshold = p.getCollectionUsageThreshold();
if (threshold != 0) {
// Expect the default threshold is zero (disabled)
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" has non-zero threshold (" + threshold);
}
// isCollectionUsageThresholdExceeded() should return false if threshold == 0
if (p.isCollectionUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isCollectionUsageThresholdExceeded() returned true" +
" but threshold = 0");
}
p.setCollectionUsageThreshold(1);
MemoryUsage u = p.getCollectionUsage();
if (u == null) {
if (p.isCollectionUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isCollectionUsageThresholdExceeded() returned true but" +
" getCollectionUsage() return null");
}
} else if (u.getUsed() >= 1) {
if (!p.isCollectionUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isCollectionUsageThresholdExceeded() returned false but " +
" threshold(" + p.getCollectionUsageThreshold() +
") < used(" + u.getUsed() + ")");
}
} else {
if (p.isCollectionUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isCollectionUsageThresholdExceeded() returned true but" +
" threshold(" + p.getCollectionUsageThreshold() +
") > used(" + u.getUsed() + ")");
}
}
// disable low memory detection and isCollectionUsageThresholdExceeded()
// should return false
p.setCollectionUsageThreshold(0);
if (p.isCollectionUsageThresholdExceeded()) {
throw new RuntimeException("TEST FAILED: " +
"Pool " + p.getName() +
" isCollectionUsageThresholdExceeded() returned true but threshold = 0");
}
}
}
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