jsr166-tests/src/test/java/jsr166/ThreadLocalRandom8Test.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

package jsr166;

import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.LongAdder;

import junit.framework.Test;
import junit.framework.TestSuite;

public class ThreadLocalRandom8Test extends JSR166TestCase {

    // android-note: Removed because the CTS runner does a bad job of
    // retrying tests that have suite() declarations.
    //
    // public static void main(String[] args) {
    //     main(suite(), args);
    // }
    // public static Test suite() {
    //     return new TestSuite(ThreadLocalRandom8Test.class);
    // }

    // max sampled int bound
    static final int MAX_INT_BOUND = (1 << 26);

    // max sampled long bound
    static final long MAX_LONG_BOUND = (1L << 42);

    // Number of replications for other checks
    static final int REPS =
        Integer.getInteger("ThreadLocalRandom8Test.reps", 4);

    /**
     * Invoking sized ints, long, doubles, with negative sizes throws
     * IllegalArgumentException
     */
    // TODO(streams):
    // public void testBadStreamSize() {
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     Runnable[] throwingActions = {
    //         () -> r.ints(-1L),
    //         () -> r.ints(-1L, 2, 3),
    //         () -> r.longs(-1L),
    //         () -> r.longs(-1L, -1L, 1L),
    //         () -> r.doubles(-1L),
    //         () -> r.doubles(-1L, .5, .6),
    //     };
    //     assertThrows(IllegalArgumentException.class, throwingActions);
    // }

    // /**
    //  * Invoking bounded ints, long, doubles, with illegal bounds throws
    //  * IllegalArgumentException
    //  */
    // public void testBadStreamBounds() {
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     Runnable[] throwingActions = {
    //         () -> r.ints(2, 1),
    //         () -> r.ints(10, 42, 42),
    //         () -> r.longs(-1L, -1L),
    //         () -> r.longs(10, 1L, -2L),
    //         () -> r.doubles(0.0, 0.0),
    //         () -> r.doubles(10, .5, .4),
    //     };
    //     assertThrows(IllegalArgumentException.class, throwingActions);
    // }

    // /**
    //  * A parallel sized stream of ints generates the given number of values
    //  */
    // public void testIntsCount() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 0;
    //     for (int reps = 0; reps < REPS; ++reps) {
    //         counter.reset();
    //         r.ints(size).parallel().forEach(x -> counter.increment());
    //         assertEquals(size, counter.sum());
    //         size += 524959;
    //     }
    // }

    // /**
    //  * A parallel sized stream of longs generates the given number of values
    //  */
    // public void testLongsCount() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 0;
    //     for (int reps = 0; reps < REPS; ++reps) {
    //         counter.reset();
    //         r.longs(size).parallel().forEach(x -> counter.increment());
    //         assertEquals(size, counter.sum());
    //         size += 524959;
    //     }
    // }

    // /**
    //  * A parallel sized stream of doubles generates the given number of values
    //  */
    // public void testDoublesCount() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 0;
    //     for (int reps = 0; reps < REPS; ++reps) {
    //         counter.reset();
    //         r.doubles(size).parallel().forEach(x -> counter.increment());
    //         assertEquals(size, counter.sum());
    //         size += 524959;
    //     }
    // }

    // /**
    //  * Each of a parallel sized stream of bounded ints is within bounds
    //  */
    // public void testBoundedInts() {
    //     AtomicInteger fails = new AtomicInteger(0);
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 12345L;
    //     for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
    //         for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
    //             final int lo = least, hi = bound;
    //             r.ints(size, lo, hi).parallel().forEach(
    //                 x -> {
    //                     if (x < lo || x >= hi)
    //                         fails.getAndIncrement(); });
    //         }
    //     }
    //     assertEquals(0, fails.get());
    // }

    // /**
    //  * Each of a parallel sized stream of bounded longs is within bounds
    //  */
    // public void testBoundedLongs() {
    //     AtomicInteger fails = new AtomicInteger(0);
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 123L;
    //     for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
    //         for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
    //             final long lo = least, hi = bound;
    //             r.longs(size, lo, hi).parallel().forEach(
    //                 x -> {
    //                     if (x < lo || x >= hi)
    //                         fails.getAndIncrement(); });
    //         }
    //     }
    //     assertEquals(0, fails.get());
    // }

    // /**
    //  * Each of a parallel sized stream of bounded doubles is within bounds
    //  */
    // public void testBoundedDoubles() {
    //     AtomicInteger fails = new AtomicInteger(0);
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 456;
    //     for (double least = 0.00011; least < 1.0e20; least *= 9) {
    //         for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
    //             final double lo = least, hi = bound;
    //             r.doubles(size, lo, hi).parallel().forEach(
    //                 x -> {
    //                     if (x < lo || x >= hi)
    //                         fails.getAndIncrement(); });
    //         }
    //     }
    //     assertEquals(0, fails.get());
    // }

    // /**
    //  * A parallel unsized stream of ints generates at least 100 values
    //  */
    // public void testUnsizedIntsCount() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 100;
    //     r.ints().limit(size).parallel().forEach(x -> counter.increment());
    //     assertEquals(size, counter.sum());
    // }

    // /**
    //  * A parallel unsized stream of longs generates at least 100 values
    //  */
    // public void testUnsizedLongsCount() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 100;
    //     r.longs().limit(size).parallel().forEach(x -> counter.increment());
    //     assertEquals(size, counter.sum());
    // }

    // /**
    //  * A parallel unsized stream of doubles generates at least 100 values
    //  */
    // public void testUnsizedDoublesCount() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 100;
    //     r.doubles().limit(size).parallel().forEach(x -> counter.increment());
    //     assertEquals(size, counter.sum());
    // }

    // /**
    //  * A sequential unsized stream of ints generates at least 100 values
    //  */
    // public void testUnsizedIntsCountSeq() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 100;
    //     r.ints().limit(size).forEach(x -> counter.increment());
    //     assertEquals(size, counter.sum());
    // }

    // /**
    //  * A sequential unsized stream of longs generates at least 100 values
    //  */
    // public void testUnsizedLongsCountSeq() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 100;
    //     r.longs().limit(size).forEach(x -> counter.increment());
    //     assertEquals(size, counter.sum());
    // }

    // /**
    //  * A sequential unsized stream of doubles generates at least 100 values
    //  */
    // public void testUnsizedDoublesCountSeq() {
    //     LongAdder counter = new LongAdder();
    //     ThreadLocalRandom r = ThreadLocalRandom.current();
    //     long size = 100;
    //     r.doubles().limit(size).forEach(x -> counter.increment());
    //     assertEquals(size, counter.sum());
    // }

}