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/* @test 25 * @summary Test probing content type simultaneously from multiple threads. 26 * @requires (os.family == "linux") | (os.family == "solaris") 27 * @build ParallelProbes SimpleFileTypeDetector 28 * @run main/othervm ParallelProbes 10 29 */ 30 31import java.io.IOException; 32import java.nio.file.Files; 33import java.nio.file.Path; 34import java.util.ArrayList; 35 36public class ParallelProbes { 37 38 private static final int REPEATS = 1000; 39 40 private int numThreads = 0; 41 private ArrayList<Thread> threads; 42 43 public ParallelProbes(int numThreads) { 44 System.out.println("Using <" + numThreads + "> threads."); 45 this.numThreads = numThreads; 46 this.threads = new ArrayList<Thread>(numThreads); 47 } 48 49 private Path createTmpFile() throws IOException { 50 final Path p = Files.createTempFile("prefix", ".json"); 51 Files.write(p, "{\"test\"}".getBytes()); 52 System.out.println("Write test file <" + p + ">"); 53 return p; 54 } 55 56 private Runnable createRunnable(final Path p) { 57 Runnable r = new Runnable() { 58 public void run() { 59 for (int i = 0; i < REPEATS; i++) { 60 try { 61 System.out.println(Thread.currentThread().getName() 62 + " -> " + Files.probeContentType(p)); 63 } catch (IOException ioException) { 64 ioException.printStackTrace(); 65 } 66 } 67 } 68 }; 69 return r; 70 } 71 72 public void start() throws IOException { 73 for (int i = 0; i < numThreads; i++) { 74 final Path p = createTmpFile(); 75 Runnable r = createRunnable(p); 76 Thread thread = new Thread(r, "thread-" + i); 77 thread.start(); 78 threads.add(thread); 79 } 80 } 81 82 public void join() { 83 for (Thread thread : threads) { 84 try { 85 thread.join(); 86 } catch (InterruptedException e) { 87 // ignore it and proceed to the next one 88 } 89 } 90 } 91 92 public static void main(String[] args) throws Exception { 93 ParallelProbes probes = 94 new ParallelProbes(args.length < 1 ? 1 : Integer.parseInt(args[0])); 95 probes.start(); 96 probes.join(); 97 } 98} 99