hotspot/test/testlibrary_tests/RandomGeneratorTest.java
author ctornqvi
Fri, 19 Aug 2016 10:06:30 -0400
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8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff
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/*
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 * Copyright (c) 2014, 2016, 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 /test/lib
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 * @modules java.base/jdk.internal.misc
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 *          java.management
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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 java.io.FileWriter;
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import java.io.IOException;
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import java.io.PrintWriter;
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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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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.Utils;
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/**
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 * The test verifies correctness of work {@link jdk.test.lib.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 origFileName = seedOpt.name() + "_orig";
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        jvmArgs.add(origFileName);
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        int fileNameIndex = jvmArgs.size() - 1;
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        String[] cmdLineArgs = jvmArgs.toArray(new String[jvmArgs.size()]);
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        ProcessTools.executeTestJvm(cmdLineArgs).shouldHaveExitValue(0);
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        String etalon = Utils.fileAsString(origFileName).trim();
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        cmdLineArgs[fileNameIndex] = seedOpt.name();
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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 output;
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            OutputAnalyzer oa;
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            try {
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                oa = ProcessTools.executeTestJvm(cmdLine);
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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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            oa.shouldHaveExitValue(0);
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            try {
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                output = Utils.fileAsString(name()).trim();
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            } catch (IOException ioe) {
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                throw new Error("TESTBUG: Problem during IO operation with file: " + name(), ioe);
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            }
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            if (!isOutputExpected(orig, output)) {
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                System.err.println("Initial output: " + orig);
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                System.err.println("Second run output: " + output);
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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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    }
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    /**
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     * The helper class generates several random numbers
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     * and put results to a file. The file name came as first
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     * command line argument.
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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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            try (PrintWriter pw = new PrintWriter(new FileWriter(args[0]))) {
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                pw.write(sb.toString());
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            } catch (IOException ioe) {
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                throw new Error("TESTBUG: Problem during IO operation with file: " + args[0], ioe);
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            }
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        }
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    }
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}