test/jdk/jdk/jfr/jmx/TestSnapshot.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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).
 *
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package jdk.jfr.jmx;

import java.io.IOException;
import java.util.List;

import jdk.jfr.FlightRecorder;
import jdk.jfr.Recording;
import jdk.management.jfr.FlightRecorderMXBean;
import jdk.management.jfr.RecordingInfo;
import jdk.test.lib.jfr.SimpleEvent;

/* @test
 * @key jfr
 * @library /test/lib /test/jdk
 * @run main/othervm jdk.jfr.jmx.TestSnapshot
 */
public class TestSnapshot {

    public static void main(String[] args) throws Exception {
        testEmpty();
        testStopped();
    }

    private static void testStopped() throws IOException {
        try (Recording r = new Recording()) {
            r.enable(SimpleEvent.class);
            r.start();
            SimpleEvent se = new SimpleEvent();
            se.commit();
            r.stop();

            try (Recording snapshot = FlightRecorder.getFlightRecorder().takeSnapshot()) {
                r.close();
                FlightRecorderMXBean mxBean = JmxHelper.getFlighteRecorderMXBean();
                List<RecordingInfo> recs = mxBean.getRecordings();
                JmxHelper.verifyEquals(recs.get(0), snapshot);
            }
        }
    }

    private static void testEmpty() throws IOException {
        try (Recording snapshot = FlightRecorder.getFlightRecorder().takeSnapshot()) {
            FlightRecorderMXBean mxBean = JmxHelper.getFlighteRecorderMXBean();
            List<RecordingInfo> recs = mxBean.getRecordings();
            JmxHelper.verifyEquals(recs.get(0), snapshot);
        }
    }
}