| /* |
| * 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"); |
| } |
| } |
| } |