1 /*
   2  * Copyright (c) 2015, 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.io.IOException;
  25 import java.nio.file.Files;
  26 import java.nio.file.Path;
  27 
  28 /* @test
  29  * @summary Test probing content type simultaneously from multiple threads.
  30  * @requires (os.family == "linux") | (os.family == "solaris")
  31  * @run main/othervm ParallelProbes 10
  32  */
  33 public class ParallelProbes {
  34 
  35     private int threads = 0;
  36     private static final int REPEATS = 1000;
  37 
  38     public ParallelProbes(int threads) {
  39         this.threads = threads;
  40         System.out.println("Using <" + threads + "> threads.");
  41     }
  42 
  43     public void start() throws IOException {
  44         for (int i = 0; i < threads; i++) {
  45             final Path p = createTmpFile();
  46             Runnable r = createRunnable(p);
  47             new Thread(r, "thread-" + i).start();
  48         }
  49     }
  50 
  51     private Runnable createRunnable(final Path p) {
  52         Runnable r = new Runnable() {
  53             public void run() {
  54                 for (int i = 0; i < REPEATS; i++) {
  55                     try {
  56                         System.out.println(Thread.currentThread().getName()
  57                             + " -> " + Files.probeContentType(p));
  58                     } catch (IOException ioException) {
  59                         ioException.printStackTrace();
  60                     }
  61                 }
  62             }
  63         };
  64         return r;
  65     }
  66 
  67     private Path createTmpFile() throws IOException {
  68         final Path p = Files.createTempFile("prefix", ".json");
  69         Files.write(p, "{\"test\"}".getBytes());
  70         System.out.println("Write test file <" + p + ">");
  71         return p;
  72     }
  73 
  74     public static void main(String[] args) throws Exception {
  75         if (args != null && args.length != 1) {
  76             new ParallelProbes(1).start();
  77         } else {
  78             new ParallelProbes(Integer.parseInt(args[0])).start();
  79         }
  80     }
  81 }