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 import static jdk.test.lib.Asserts.assertTrue;
  28 
  29 import java.util.concurrent.TimeUnit;
  30 import java.util.concurrent.locks.Condition;
  31 import java.util.concurrent.locks.Lock;
  32 import java.util.concurrent.locks.ReentrantLock;
  33 
  34 import jdk.jfr.FlightRecorder;
  35 import jdk.jfr.FlightRecorderListener;
  36 
  37 /*
  38  * @test
  39  * @key jfr
  40  * @library /test/lib
  41  * @run main/othervm jdk.jfr.api.flightrecorder.TestFlightRecorderListenerRecorderInitialized
  42  */
  43 public class TestFlightRecorderListenerRecorderInitialized {
  44 
  45     /**
  46      * Utility class to wait/notify
  47      */
  48     private static class Signal {
  49 
  50         private static volatile boolean signalled;
  51         private static final Lock lock = new ReentrantLock();
  52         private static final Condition cond = lock.newCondition();
  53 
  54         private static void waitFor(long timeout, TimeUnit timeUnit) throws InterruptedException {
  55             try {
  56                 lock.lock();
  57                 if (!signalled) {
  58                     log("Waiting for FlightRecorder.recorderInitialized notification...");
  59                     cond.await(timeout, timeUnit);
  60                 }
  61             } finally {
  62                 lock.unlock();
  63             }
  64         }
  65 
  66         private static void signal() {
  67             try {
  68                 lock.lock();
  69                 signalled = true;
  70                 cond.signalAll();
  71             } finally {
  72                 lock.unlock();
  73             }
  74         }
  75     };
  76 
  77     public static void main(String[] args) throws Throwable {
  78         FlightRecorder.addListener(new FlightRecorderListener() {
  79 
  80             @Override
  81             public void recorderInitialized(FlightRecorder recorder) {
  82                 log("Recorder initialized");
  83                 Signal.signal();
  84             }
  85 
  86         });
  87         FlightRecorder.getFlightRecorder();
  88 
  89         Signal.waitFor(3, TimeUnit.SECONDS);
  90 
  91         assertTrue(Signal.signalled, "FlightRecorderListener.recorderInitialized has not been called");
  92 
  93     }
  94 
  95     private static void log(String s) {
  96         System.out.println(s);
  97     }
  98 }