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package jdk.jfr.api.flightrecorder;

import static jdk.test.lib.Asserts.assertEquals;

import java.util.concurrent.atomic.AtomicInteger;

import jdk.jfr.FlightRecorder;

import jdk.jfr.FlightRecorderListener;

/*

 * @test

 * @summary Test Flight Recorder initialization callback is only called once

 * @key jfr

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.flightrecorder.TestRecorderInitializationCallback

 */

public class TestRecorderInitializationCallback {

    private static class TestListener implements FlightRecorderListener {

        private final AtomicInteger count = new AtomicInteger();

        @Override

        public void recorderInitialized(FlightRecorder recorder) {

            count.incrementAndGet();

            System.out.println("recorderInitialized: " + recorder + " count=" + count);

            // Get the recorder again, should not trigger listener

            FlightRecorder.getFlightRecorder();

        }

    }

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

        TestListener t = new TestListener();

        FlightRecorder.addListener(t);

        // trigger initialization

        FlightRecorder.getFlightRecorder();

        assertEquals(1, t.count.intValue(), "Expected 1 notification, got " + t.count);

    }

}