1 /*
   2  * Copyright (c) 2019, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.nio.file.Files;
  25 import java.nio.file.Path;
  26 import java.nio.file.Paths;
  27 import jdk.jfr.Event;
  28 import jdk.jfr.Description;
  29 import jdk.jfr.Label;
  30 
  31 
  32 // This class generates simple event in a loop for a specified time.
  33 public class EventGeneratorLoop {
  34 
  35     @Label("SimpleEvent")
  36     @Description("Simple custom event")
  37     static class SimpleEvent extends Event {
  38         @Label("Message")
  39         String msg;
  40 
  41         @Label("Count")
  42         int count;
  43     }
  44 
  45 
  46     // Arguments:
  47     // - time to run (in seconds) - mandatory
  48     // - full file path to signal the start of main - optional
  49     public static void main(String[] args) throws Exception {
  50         if ((args.length < 1) || (args[0] == null)) {
  51             throw new IllegalArgumentException("Expecting one argument: time to run (seconds)");
  52         }
  53         int howLong = Integer.parseInt(args[0]);
  54 
  55         if ((args.length > 1) && (args[1] != null)) {
  56             signalStartOfMain(args[1]);
  57         }
  58 
  59         for (int i=0; i < howLong; i++) {
  60             SimpleEvent ev = new SimpleEvent();
  61             ev.msg = "Hello";
  62             ev.count = i;
  63             ev.commit();
  64 
  65             try { Thread.sleep(1000); } catch (InterruptedException e) {}
  66             System.out.print(".");
  67         }
  68     }
  69 
  70     private static void signalStartOfMain(String fileName) throws Exception {
  71         Path p = Paths.get(fileName);
  72         Files.createFile(p);
  73         p.toFile().deleteOnExit();
  74 }
  75 }