1 /* 2 * Copyright (c) 2015, 2017, 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 31 import java.io.IOException; 32 import java.nio.file.Files; 33 import java.nio.file.Path; 34 import java.nio.file.Paths; 35 import java.util.ArrayList; 36 37 public class ParallelProbes { 38 39 private static final int REPEATS = 1000; 40 41 private int numThreads = 0; 42 private ArrayList<Thread> threads; 43 44 public ParallelProbes(int numThreads) { 45 System.out.println("Using <" + numThreads + "> threads."); 46 this.numThreads = numThreads; 47 this.threads = new ArrayList<Thread>(numThreads); 48 } 49 50 private Path createTmpFile() throws IOException { 51 Path dir = Paths.get(System.getProperty("test.dir", ".")); 52 final Path p = Files.createTempFile(dir, "prefix", ".json"); 53 Files.write(p, "{\"test\"}".getBytes()); 54 System.out.println("Write test file <" + p + ">"); 55 return p; 56 } 57 58 private Runnable createRunnable(final Path p) { 59 Runnable r = new Runnable() { 60 public void run() { 61 for (int i = 0; i < REPEATS; i++) { 62 try { 63 System.out.println(Thread.currentThread().getName() 64 + " -> " + Files.probeContentType(p)); 65 } catch (IOException ioException) { 66 ioException.printStackTrace(); 67 } 68 } 69 } 70 }; 71 return r; 72 } 73 74 public void start() throws IOException { 75 for (int i = 0; i < numThreads; i++) { 76 final Path p = createTmpFile(); 77 Runnable r = createRunnable(p); 78 Thread thread = new Thread(r, "thread-" + i); 79 thread.start(); 80 threads.add(thread); 81 } 82 } 83 84 public void join() { 85 for (Thread thread : threads) { 86 try { 87 thread.join(); 88 } catch (InterruptedException e) { 89 // ignore it and proceed to the next one 90 } 91 } 92 } 93 94 public static void main(String[] args) throws Exception { 95 ParallelProbes probes = 96 new ParallelProbes(args.length < 1 ? 1 : Integer.parseInt(args[0])); 97 probes.start(); 98 probes.join(); 99 } 100 }