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JFRDynamicCDSApp.java
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JFRDynamicCDSApp.java
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/*
* Copyright (c) 2021, 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.
*
* 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.
*
*/
import java.nio.file.Paths;
import jdk.jfr.Configuration;
import jdk.jfr.Description;
import jdk.jfr.Label;
import jdk.jfr.Name;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordingStream;
public class JFRDynamicCDSApp {
public static void main(String args[]) throws Exception {
int mode = 4;
try {
mode = Integer.parseInt(args[0]);
} catch (Throwable t) {}
if (mode > 0) {
RecordingStream rs = new RecordingStream();
if (mode > 1) {
rs.enable("JFRDynamicCDS.StressEvent");
rs.startAsync();
if (mode > 2) {
Recording recording = startRecording();
if (mode > 3) {
loop();
}
recording.stop();
recording.close();
}
}
rs.close();
}
}
static Recording startRecording() throws Exception {
Configuration configuration = Configuration.getConfiguration("default");
Recording recording = new Recording(configuration);
recording.setName("internal");
recording.enable(StressEvent.class);
recording.setDestination(Paths.get("JFRDynamicCDS.jfr"));
recording.start();
return recording;
}
static void loop() {
for (int i=0; i<100; i++) {
StressEvent event = new StressEvent();
event.iteration = i;
event.description = "Stressful Event, take it easy!";
event.customClazz = StressEvent.class;
event.value = i;
event.commit();
}
}
/**
* Internal StressEvent class.
*/
@Label("Stress Event")
@Description("A duration event with 4 entries")
@Name("JFRDynamicCDS.StressEvent")
public static class StressEvent extends jdk.jfr.Event {
public Class<?> customClazz;
public String description;
public int iteration;
public double value;
}
}