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.flightrecorder; 27 28 import static jdk.test.lib.Asserts.assertEquals; 29 30 import java.util.concurrent.atomic.AtomicInteger; 31 32 import jdk.jfr.FlightRecorder; 33 import jdk.jfr.FlightRecorderListener; 34 35 /** 36 * @test 37 * @summary Test Flight Recorder initialization callback is only called once 38 * @key jfr 39 * 40 * @library /lib / 41 * @run main/othervm jdk.jfr.api.flightrecorder.TestRecorderInitializationCallback 42 */ 43 public class TestRecorderInitializationCallback { 44 45 private static class TestListener implements FlightRecorderListener { 46 private final AtomicInteger count = new AtomicInteger(); 47 48 @Override 49 public void recorderInitialized(FlightRecorder recorder) { 50 count.incrementAndGet(); 51 System.out.println("recorderInitialized: " + recorder + " count=" + count); 52 // Get the recorder again, should not trigger listener 53 FlightRecorder.getFlightRecorder(); 54 } 55 } 56 57 public static void main(String[] args) throws Throwable { 58 TestListener t = new TestListener(); 59 FlightRecorder.addListener(t); 60 // trigger initialization 61 FlightRecorder.getFlightRecorder(); 62 assertEquals(1, t.count.intValue(), "Expected 1 notification, got " + t.count); 63 } 64 }