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