| /* |
| * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @summary Verify correctnes of the random generator from Utility.java |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @run driver RandomGeneratorTest SAME_SEED |
| * @run driver RandomGeneratorTest NO_SEED |
| * @run driver RandomGeneratorTest DIFFERENT_SEED |
| */ |
| |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.ProcessTools; |
| import jdk.test.lib.Utils; |
| |
| /** |
| * The test verifies correctness of work {@link jdk.test.lib.Utils#getRandomInstance()}. |
| * Test works in three modes: same seed provided, no seed provided and |
| * different seed provided. In the first case the test expects that all random numbers |
| * will be repeated in all next iterations. For other two modes test expects that |
| * randomly generated numbers differ from original. |
| */ |
| public class RandomGeneratorTest { |
| private static final String SEED_VM_OPTION = "-D" + Utils.SEED_PROPERTY_NAME + "="; |
| |
| public static void main( String[] args) throws Throwable { |
| if (args.length == 0) { |
| throw new Error("TESTBUG: No test mode provided."); |
| } |
| SeedOption seedOpt = SeedOption.valueOf(args[0]); |
| List<String> jvmArgs = new ArrayList<String>(); |
| String optStr = seedOpt.getSeedOption(); |
| if (optStr != null) { |
| jvmArgs.add(optStr); |
| } |
| jvmArgs.add(RandomRunner.class.getName()); |
| String origFileName = seedOpt.name() + "_orig"; |
| jvmArgs.add(origFileName); |
| int fileNameIndex = jvmArgs.size() - 1; |
| String[] cmdLineArgs = jvmArgs.toArray(new String[jvmArgs.size()]); |
| ProcessTools.executeTestJvm(cmdLineArgs).shouldHaveExitValue(0); |
| String etalon = Utils.fileAsString(origFileName).trim(); |
| cmdLineArgs[fileNameIndex] = seedOpt.name(); |
| seedOpt.verify(etalon, cmdLineArgs); |
| } |
| |
| /** |
| * The utility enum helps to generate an appropriate string that should be passed |
| * to the command line depends on the testing mode. It is also responsible for the result |
| * validation. |
| */ |
| private enum SeedOption { |
| SAME_SEED { |
| @Override |
| public String getSeedOption() { |
| return SEED_VM_OPTION + Utils.SEED; |
| } |
| |
| @Override |
| protected boolean isOutputExpected(String orig, String output) { |
| return output.equals(orig); |
| } |
| }, |
| DIFFERENT_SEED { |
| @Override |
| public String getSeedOption() { |
| return SEED_VM_OPTION + Utils.getRandomInstance().nextLong(); |
| } |
| |
| @Override |
| public void verify(String orig, String[] cmdLine) { |
| cmdLine[0] = getSeedOption(); |
| super.verify(orig, cmdLine); |
| } |
| }, |
| NO_SEED { |
| @Override |
| public String getSeedOption() { |
| return null; |
| } |
| }; |
| |
| /** |
| * Generates a string to be added as a command line argument. |
| * It contains "-D" prefix, system property name, '=' sign |
| * and seed value. |
| * @return command line argument |
| */ |
| public abstract String getSeedOption(); |
| |
| protected boolean isOutputExpected(String orig, String output) { |
| return !output.equals(orig); |
| } |
| |
| /** |
| * Verifies that the original output meets expectations |
| * depending on the test mode. It compares the output of second execution |
| * to original one. |
| * @param orig original output |
| * @param cmdLine command line arguments |
| * @throws Throwable - Throws an exception in case test failure. |
| */ |
| public void verify(String orig, String[] cmdLine) { |
| String output; |
| OutputAnalyzer oa; |
| try { |
| oa = ProcessTools.executeTestJvm(cmdLine); |
| } catch (Throwable t) { |
| throw new Error("TESTBUG: Unexpedted exception during jvm execution.", t); |
| } |
| oa.shouldHaveExitValue(0); |
| try { |
| output = Utils.fileAsString(name()).trim(); |
| } catch (IOException ioe) { |
| throw new Error("TESTBUG: Problem during IO operation with file: " + name(), ioe); |
| } |
| if (!isOutputExpected(orig, output)) { |
| System.err.println("Initial output: " + orig); |
| System.err.println("Second run output: " + output); |
| throw new AssertionError("Unexpected random number sequence for mode: " + this.name()); |
| } |
| } |
| } |
| |
| /** |
| * The helper class generates several random numbers |
| * and put results to a file. The file name came as first |
| * command line argument. |
| */ |
| public static class RandomRunner { |
| private static final int COUNT = 10; |
| public static void main(String[] args) { |
| StringBuilder sb = new StringBuilder(); |
| Random rng = Utils.getRandomInstance(); |
| for (int i = 0; i < COUNT; i++) { |
| sb.append(rng.nextLong()).append(' '); |
| } |
| try (PrintWriter pw = new PrintWriter(new FileWriter(args[0]))) { |
| pw.write(sb.toString()); |
| } catch (IOException ioe) { |
| throw new Error("TESTBUG: Problem during IO operation with file: " + args[0], ioe); |
| } |
| } |
| } |
| } |