1 /* 2 * Copyright (c) 2018, Google 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 package MyPackage; 25 26 import java.util.List; 27 28 /** 29 * @test 30 * @build Frame HeapMonitor 31 * @summary Verifies the default GC with the Heap Monitor event system. 32 * @compile HeapMonitorGCTest.java 33 * @requires vm.gc == "G1" | vm.gc == "null" 34 * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorGCTest 35 */ 36 37 /** 38 * This test is checking that various GCs work as intended: events are sent, forcing GC works, etc. 39 */ 40 public class HeapMonitorGCTest { 41 public static void main(String[] args) { 42 if (!HeapMonitor.eventStorageIsEmpty()) { 43 throw new RuntimeException("Statistics should be null to begin with."); 44 } 45 46 HeapMonitor.enableSamplingEvents(); 47 48 List<Frame> frameList = HeapMonitor.allocate(); 49 frameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorGCTest.java", 48)); 50 Frame[] frames = frameList.toArray(new Frame[0]); 51 52 if (!HeapMonitor.obtainedEvents(frames)) { 53 throw new RuntimeException("No expected events were found."); 54 } 55 56 HeapMonitor.forceGarbageCollection(); 57 58 if (!HeapMonitor.garbageContains(frames)) { 59 throw new RuntimeException("Forcing GC did not work, not a single object was collected."); 60 } 61 } 62 }