1 /* 2 * Copyright (c) 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.api.consumer; 27 28 import java.nio.file.Path; 29 import java.nio.file.Paths; 30 import java.util.LinkedList; 31 import java.util.List; 32 33 import jdk.jfr.Event; 34 import jdk.jfr.Recording; 35 import jdk.jfr.consumer.RecordedEvent; 36 import jdk.jfr.consumer.RecordingFile; 37 import jdk.test.lib.Asserts; 38 import jdk.test.lib.Utils; 39 40 41 /** 42 * @test 43 * @summary Reads the recorded file two times and verifies that both reads are the same 44 * @key jfr 45 * 46 * @library /lib / 47 * @run main/othervm jdk.jfr.api.consumer.TestReadTwice 48 */ 49 public class TestReadTwice { 50 51 private static class MyEvent extends Event { 52 } 53 54 public static void main(String[] args) throws Throwable { 55 Recording r = new Recording(); 56 r.enable(MyEvent.class).withoutStackTrace(); 57 r.start(); 58 59 // Commit a single event to the recording 60 MyEvent event = new MyEvent(); 61 event.commit(); 62 63 r.stop(); 64 65 // Dump the recording to a file 66 Path path = Utils.createTempFile("read-twice", ".jfr"); 67 System.out.println("Dumping to " + path); 68 r.dump(path); 69 r.close(); 70 71 // Read all events from the file in one go 72 List<RecordedEvent> events = RecordingFile.readAllEvents(path); 73 74 // Read again the same events one by one 75 RecordingFile rfile = new RecordingFile(path); 76 List<RecordedEvent> events2 = new LinkedList<>(); 77 while (rfile.hasMoreEvents()) { 78 events2.add(rfile.readEvent()); 79 } 80 81 // Compare sizes 82 Asserts.assertEquals(events.size(), events2.size()); 83 rfile.close(); 84 } 85 }