| /* |
| * 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 |
| */ |
| 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()); |
| } |
| |
| } |