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import java.util.*; |
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import java.util.SplittableRandom; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.atomic.AtomicLong; |
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import java.util.concurrent.atomic.LongAdder; |
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public class SplittableRandomTest extends JSR166TestCase { |
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static final int NCALLS = 10000; |
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// max sampled int bound |
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static final int MAX_INT_BOUND = (1 << 28); |
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static final int MAX_INT_BOUND = (1 << 26); |
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|
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// max sampled long bound |
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static final long MAX_LONG_BOUND = (1L << 42); |
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static final long MAX_LONG_BOUND = (1L << 40); |
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|
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// Number of replications for other checks |
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static final int REPS = 20; |
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static final int REPS = |
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Integer.getInteger("SplittableRandomTest.reps", 4); |
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|
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/** |
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* Repeated calls to nextInt produce at least two distinct results |
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* same values for nextLong. |
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*/ |
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public void testSeedConstructor() { |
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for (long seed = 2; seed < MAX_LONG_BOUND; seed += 15485863) { |
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for (long seed = 2; seed < MAX_LONG_BOUND; seed += 15485863) { |
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SplittableRandom sr1 = new SplittableRandom(seed); |
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SplittableRandom sr2 = new SplittableRandom(seed); |
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for (int i = 0; i < REPS; ++i) |
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} |
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/** |
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* nextInt(negative) throws IllegalArgumentException |
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* nextInt(non-positive) throws IllegalArgumentException |
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*/ |
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public void testNextIntBoundedNeg() { |
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public void testNextIntBoundNonPositive() { |
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SplittableRandom sr = new SplittableRandom(); |
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try { |
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int f = sr.nextInt(-17); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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Runnable[] throwingActions = { |
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() -> sr.nextInt(-17), |
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() -> sr.nextInt(0), |
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() -> sr.nextInt(Integer.MIN_VALUE), |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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|
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/** |
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*/ |
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public void testNextIntBadBounds() { |
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SplittableRandom sr = new SplittableRandom(); |
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try { |
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int f = sr.nextInt(17, 2); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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Runnable[] throwingActions = { |
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() -> sr.nextInt(17, 2), |
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() -> sr.nextInt(-42, -42), |
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() -> sr.nextInt(Integer.MAX_VALUE, Integer.MIN_VALUE), |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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/** |
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} |
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/** |
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* nextLong(negative) throws IllegalArgumentException |
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* nextLong(non-positive) throws IllegalArgumentException |
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*/ |
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public void testNextLongBoundedNeg() { |
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public void testNextLongBoundNonPositive() { |
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SplittableRandom sr = new SplittableRandom(); |
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try { |
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long f = sr.nextLong(-17); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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Runnable[] throwingActions = { |
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() -> sr.nextLong(-17L), |
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() -> sr.nextLong(0L), |
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() -> sr.nextLong(Long.MIN_VALUE), |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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/** |
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*/ |
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public void testNextLongBadBounds() { |
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SplittableRandom sr = new SplittableRandom(); |
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try { |
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long f = sr.nextLong(17, 2); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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Runnable[] throwingActions = { |
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() -> sr.nextLong(17L, 2L), |
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() -> sr.nextLong(-42L, -42L), |
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() -> sr.nextLong(Long.MAX_VALUE, Long.MIN_VALUE), |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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/** |
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} |
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/** |
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* nextDouble(non-positive) throws IllegalArgumentException |
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*/ |
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public void testNextDoubleBoundNonPositive() { |
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SplittableRandom sr = new SplittableRandom(); |
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Runnable[] throwingActions = { |
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() -> sr.nextDouble(-17.0d), |
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() -> sr.nextDouble(0.0d), |
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() -> sr.nextDouble(-Double.MIN_VALUE), |
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() -> sr.nextDouble(Double.NEGATIVE_INFINITY), |
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() -> sr.nextDouble(Double.NaN), |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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|
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/** |
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* nextDouble(! (least < bound)) throws IllegalArgumentException |
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*/ |
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public void testNextDoubleBadBounds() { |
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SplittableRandom sr = new SplittableRandom(); |
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Runnable[] throwingActions = { |
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() -> sr.nextDouble(17.0d, 2.0d), |
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() -> sr.nextDouble(-42.0d, -42.0d), |
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() -> sr.nextDouble(Double.MAX_VALUE, Double.MIN_VALUE), |
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() -> sr.nextDouble(Double.NaN, 0.0d), |
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() -> sr.nextDouble(0.0d, Double.NaN), |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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|
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// TODO: Test infinite bounds! |
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//() -> sr.nextDouble(Double.NEGATIVE_INFINITY, 0.0d), |
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//() -> sr.nextDouble(0.0d, Double.POSITIVE_INFINITY), |
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|
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/** |
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* nextDouble(least, bound) returns least <= value < bound; |
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* repeated calls produce at least two distinct results |
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*/ |
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*/ |
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public void testBadStreamSize() { |
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SplittableRandom r = new SplittableRandom(); |
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try { |
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java.util.stream.IntStream x = r.ints(-1L); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.IntStream x = r.ints(-1L, 2, 3); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.LongStream x = r.longs(-1L); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.LongStream x = r.longs(-1L, -1L, 1L); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.DoubleStream x = r.doubles(-1L); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.DoubleStream x = r.doubles(-1L, .5, .6); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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Runnable[] throwingActions = { |
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() -> { java.util.stream.IntStream x = r.ints(-1L); }, |
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() -> { java.util.stream.IntStream x = r.ints(-1L, 2, 3); }, |
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() -> { java.util.stream.LongStream x = r.longs(-1L); }, |
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() -> { java.util.stream.LongStream x = r.longs(-1L, -1L, 1L); }, |
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() -> { java.util.stream.DoubleStream x = r.doubles(-1L); }, |
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() -> { java.util.stream.DoubleStream x = r.doubles(-1L, .5, .6); }, |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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/** |
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*/ |
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public void testBadStreamBounds() { |
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SplittableRandom r = new SplittableRandom(); |
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try { |
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java.util.stream.IntStream x = r.ints(2, 1); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.IntStream x = r.ints(10, 42, 42); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.LongStream x = r.longs(-1L, -1L); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.LongStream x = r.longs(10, 1L, -2L); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.DoubleStream x = r.doubles(0.0, 0.0); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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try { |
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java.util.stream.DoubleStream x = r.doubles(10, .5, .4); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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Runnable[] throwingActions = { |
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() -> { java.util.stream.IntStream x = r.ints(2, 1); }, |
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() -> { java.util.stream.IntStream x = r.ints(10, 42, 42); }, |
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() -> { java.util.stream.LongStream x = r.longs(-1L, -1L); }, |
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() -> { java.util.stream.LongStream x = r.longs(10, 1L, -2L); }, |
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() -> { java.util.stream.DoubleStream x = r.doubles(0.0, 0.0); }, |
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() -> { java.util.stream.DoubleStream x = r.doubles(10, .5, .4); }, |
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}; |
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assertThrows(IllegalArgumentException.class, throwingActions); |
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} |
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/** |
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long size = 0; |
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for (int reps = 0; reps < REPS; ++reps) { |
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counter.reset(); |
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r.ints(size).parallel().forEach(x -> {counter.increment();}); |
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r.ints(size).parallel().forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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size += 524959; |
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} |
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long size = 0; |
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for (int reps = 0; reps < REPS; ++reps) { |
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counter.reset(); |
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r.longs(size).parallel().forEach(x -> {counter.increment();}); |
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r.longs(size).parallel().forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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size += 524959; |
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} |
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long size = 0; |
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for (int reps = 0; reps < REPS; ++reps) { |
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counter.reset(); |
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r.doubles(size).parallel().forEach(x -> {counter.increment();}); |
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r.doubles(size).parallel().forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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size += 524959; |
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} |
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LongAdder counter = new LongAdder(); |
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SplittableRandom r = new SplittableRandom(); |
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long size = 100; |
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r.ints().limit(size).parallel().forEach(x -> {counter.increment();}); |
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r.ints().limit(size).parallel().forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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} |
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LongAdder counter = new LongAdder(); |
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SplittableRandom r = new SplittableRandom(); |
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long size = 100; |
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r.longs().limit(size).parallel().forEach(x -> {counter.increment();}); |
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r.longs().limit(size).parallel().forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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} |
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LongAdder counter = new LongAdder(); |
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SplittableRandom r = new SplittableRandom(); |
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long size = 100; |
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r.doubles().limit(size).parallel().forEach(x -> {counter.increment();}); |
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r.doubles().limit(size).parallel().forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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} |
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LongAdder counter = new LongAdder(); |
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SplittableRandom r = new SplittableRandom(); |
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long size = 100; |
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r.ints().limit(size).forEach(x -> {counter.increment();}); |
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r.ints().limit(size).forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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} |
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LongAdder counter = new LongAdder(); |
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SplittableRandom r = new SplittableRandom(); |
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long size = 100; |
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r.longs().limit(size).forEach(x -> {counter.increment();}); |
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r.longs().limit(size).forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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} |
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LongAdder counter = new LongAdder(); |
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SplittableRandom r = new SplittableRandom(); |
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long size = 100; |
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r.doubles().limit(size).forEach(x -> {counter.increment();}); |
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r.doubles().limit(size).forEach(x -> counter.increment()); |
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assertEquals(size, counter.sum()); |
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} |
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