test/jdk/jdk/jfr/api/recorder/TestRecorderInitialized.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * accompanied this code).
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package jdk.jfr.api.recorder;

import jdk.jfr.FlightRecorder;
import jdk.jfr.FlightRecorderListener;
import jdk.test.lib.Asserts;

/**
 * @test TestRecorderListener
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 *
 * @run main/othervm jdk.jfr.api.recorder.TestRecorderInitialized
 */
public class TestRecorderInitialized {

    static class Listener implements FlightRecorderListener {
        private boolean notified;

        @Override
        public void recorderInitialized(FlightRecorder r) {
            notified = true;
        }
    }

    public static void main(String...args) {
        Listener l1 = new Listener();

        FlightRecorder.addListener(l1);
        Asserts.assertFalse(l1.notified, "Listener shouldn't be notified unless Flight Recorder is initialized");
        // initialize Flight Recorder
        FlightRecorder.getFlightRecorder();
        Asserts.assertTrue(l1.notified, "Listener should be notified when Flight Recorder is initialized");
        l1.notified = false;

        Listener l2 = new Listener();
        FlightRecorder.addListener(l1);
        FlightRecorder.addListener(l2);
        Asserts.assertTrue(l2.notified, "Listener should be notified if Flight Recorder is already initialized");
        Asserts.assertTrue(l1.notified, "Only added listnener should be notified, if Flight Recorder is already initialized");

    }
}