1 /* 2 * Copyright (c) 2013, 2018, Oracle 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.event.gc.collection; 27 28 import static jdk.test.lib.Asserts.assertGreaterThan; 29 import static jdk.test.lib.Asserts.assertTrue; 30 31 import java.time.Duration; 32 import java.time.Instant; 33 34 import jdk.jfr.Recording; 35 import jdk.jfr.consumer.RecordedEvent; 36 import jdk.test.lib.jfr.Events; 37 import jdk.test.lib.jfr.GCHelper; 38 39 40 public class YoungGarbageCollectionEvent { 41 42 private static final String EVENT_NAME = GCHelper.event_young_garbage_collection; 43 44 public static void test() throws Exception { 45 Recording recording = new Recording(); 46 recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0)); 47 recording.start(); 48 triggerGC(); 49 recording.stop(); 50 51 boolean isAnyFound = false; 52 for (RecordedEvent event : Events.fromRecording(recording)) { 53 if (!EVENT_NAME.equals(event.getEventType().getName())) { 54 continue; 55 } 56 System.out.println("Event: " + event); 57 isAnyFound = true; 58 Events.assertField(event, "gcId").atLeast(0); 59 Events.assertField(event, "tenuringThreshold").atLeast(1); 60 61 Instant startTime = event.getStartTime(); 62 Instant endTime = event.getEndTime(); 63 Duration duration = event.getDuration(); 64 assertGreaterThan(startTime, Instant.EPOCH, "startTime should be at least 0"); 65 assertGreaterThan(endTime, Instant.EPOCH, "endTime should be at least 0"); 66 // TODO: Maybe we should accept duration of 0, but old test did not. 67 assertGreaterThan(duration, Duration.ZERO, "Duration should be above 0"); 68 assertGreaterThan(endTime, startTime, "End time should be after start time"); 69 } 70 assertTrue(isAnyFound, "No matching event found"); 71 } 72 73 public static byte[] garbage; 74 private static void triggerGC() { 75 for (int i = 0; i < 3072; i++) { 76 garbage = new byte[1024]; 77 } 78 } 79 }