--- /dev/null 2020-01-02 04:43:18.583999853 +0000 +++ new/test/jdk/jfr/api/recorder/TestStartStopRecording.java 2020-01-30 06:30:30.770692765 +0000 @@ -0,0 +1,80 @@ +/* + * 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.recorder; + +import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.LinkOption; +import java.nio.file.Path; + +import jdk.jfr.Configuration; +import jdk.jfr.Recording; +import jdk.test.lib.Utils; + +/** + * @test TestStartStopRecording + * + * @key jfr + * + * @library /lib / + * @run main/othervm jdk.jfr.api.recorder.TestStartStopRecording + */ +public class TestStartStopRecording { + + public static void main(String... args) throws Exception { + Configuration defaultConfig = Configuration.getConfiguration("default"); + // Memory + Recording inMemory = new Recording(defaultConfig); + inMemory.setToDisk(false); + + inMemory.start(); + + Path memoryFile = Utils.createTempFile("start-stop-memory-recording", ".jfr"); + inMemory.dump(memoryFile); + assertValid(memoryFile, "Not a valid memory file."); + inMemory.stop(); + inMemory.close(); + // Disk + Recording toDisk = new Recording(defaultConfig); + toDisk.setToDisk(true); + + toDisk.start(); + toDisk.stop(); + Path diskFile = Utils.createTempFile("start-stop-disk-recording", ".jfr"); + toDisk.dump(diskFile); + assertValid(diskFile, "Not a valid disk file."); + toDisk.close(); + } + + private static void assertValid(Path path, String message) throws IOException { + if (!Files.exists(path, LinkOption.NOFOLLOW_LINKS)) { + throw new AssertionError(message + " Could not find file " + path); + } + if (Files.size(path) == 0) { + throw new AssertionError(message + " File size = 0 for " + path); + } + } +}