--- /dev/null 2017-11-09 09:38:01.297999907 +0100 +++ new/test/jdk/jdk/jfr/api/consumer/TestReadTwice.java 2018-04-09 16:31:47.109407144 +0200 @@ -0,0 +1,83 @@ +/* + * Copyright (c) 2018, 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. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * 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. + */ + +package jdk.jfr.api.consumer; + +import java.nio.file.Files; +import java.nio.file.Path; +import java.util.LinkedList; +import java.util.List; + +import jdk.jfr.Event; +import jdk.jfr.Recording; +import jdk.jfr.consumer.RecordedEvent; +import jdk.jfr.consumer.RecordingFile; +import jdk.test.lib.Asserts; + + +/* + * @test + * @summary Reads the recorded file two times and verifies that both reads are the same + * @key jfr + * @library /test/lib + * @run main/othervm jdk.jfr.api.consumer.TestReadTwice + */ +public class TestReadTwice { + + private static class MyEvent extends Event { + } + + public static void main(String[] args) throws Throwable { + Recording r = new Recording(); + r.enable(MyEvent.class).withoutStackTrace(); + r.start(); + + // Commit a single event to the recording + MyEvent event = new MyEvent(); + event.commit(); + + r.stop(); + + // Dump the recording to a file + Path path = Files.createTempFile("recording", ".jfr"); + System.out.println("Dumping to " + path); + r.dump(path); + r.close(); + + // Read all events from the file in one go + List events = RecordingFile.readAllEvents(path); + + // Read again the same events one by one + RecordingFile rfile = new RecordingFile(path); + List events2 = new LinkedList<>(); + while (rfile.hasMoreEvents()) { + events2.add(rfile.readEvent()); + } + + // Compare sizes + Asserts.assertEquals(events.size(), events2.size()); + rfile.close(); + } +}