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.recording.destination;

    27 

    28 import static jdk.test.lib.Asserts.assertTrue;

    29 

    30 import java.nio.file.Files;

    31 import java.nio.file.Path;

    32 import java.nio.file.Paths;

    33 import java.util.List;

    34 

    35 import jdk.jfr.Recording;

    36 import jdk.jfr.consumer.RecordedEvent;

    37 import jdk.jfr.consumer.RecordingFile;

    38 import jdk.test.lib.Asserts;

    39 import jdk.test.lib.jfr.EventNames;

    40 

    41 /*

    42  * @test

    43  * @summary Set destination to an existing file. File should be overwritten.

    44  * @key jfr

    45  * @library /test/lib

    46  * @run main/othervm jdk.jfr.api.recording.destination.TestDestFileExist

    47  */

    48 public class TestDestFileExist {

    49 

    50     public static void main(String[] args) throws Throwable {

    51         Path dest = Paths.get(".", "my.jfr");

    52         System.out.println("dest=" + dest);

    53         Files.write(dest, "Dummy data".getBytes());

    54         assertTrue(Files.exists(dest), "Test error: Failed to create file");

    55         System.out.println("file size before recording:" + Files.size(dest));

    56         Recording r = new Recording();

    57         r.enable(EventNames.OSInformation);

    58         r.setDestination(dest);

    59         r.start();

    60         r.stop();

    61         List<RecordedEvent> events = RecordingFile.readAllEvents(dest);

    62         Asserts.assertFalse(events.isEmpty(), "No events found");

    63         System.out.println(events.iterator().next());

    64         r.close();

    65     }

    66 

    67 }