test/tck/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/
 */

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 {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    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());
    }

}
Revision:	1.7
Committed:	Wed Dec 31 19:05:43 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.6:	+4 -2 lines
Log Message:	no wildcard imports
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/publicdomain/zero/1.0/
5	*/
6
7	import java.util.concurrent.ThreadLocalRandom;
8	import java.util.concurrent.atomic.AtomicInteger;
9	import java.util.concurrent.atomic.LongAdder;
10
11	import junit.framework.Test;
12	import junit.framework.TestSuite;
13
14	public class ThreadLocalRandom8Test extends JSR166TestCase {
15
16	public static void main(String[] args) {
17	junit.textui.TestRunner.run(suite());
18	}
19	public static Test suite() {
20	return new TestSuite(ThreadLocalRandom8Test.class);
21	}
22
23	// max sampled int bound
24	static final int MAX_INT_BOUND = (1 << 26);
25
26	// max sampled long bound
27	static final long MAX_LONG_BOUND = (1L << 42);
28
29	// Number of replications for other checks
30	static final int REPS =
31	Integer.getInteger("ThreadLocalRandom8Test.reps", 4);
32
33	/**
34	* Invoking sized ints, long, doubles, with negative sizes throws
35	* IllegalArgumentException
36	*/
37	public void testBadStreamSize() {
38	ThreadLocalRandom r = ThreadLocalRandom.current();
39	Runnable[] throwingActions = {
40	() -> r.ints(-1L),
41	() -> r.ints(-1L, 2, 3),
42	() -> r.longs(-1L),
43	() -> r.longs(-1L, -1L, 1L),
44	() -> r.doubles(-1L),
45	() -> r.doubles(-1L, .5, .6),
46	};
47	assertThrows(IllegalArgumentException.class, throwingActions);
48	}
49
50	/**
51	* Invoking bounded ints, long, doubles, with illegal bounds throws
52	* IllegalArgumentException
53	*/
54	public void testBadStreamBounds() {
55	ThreadLocalRandom r = ThreadLocalRandom.current();
56	Runnable[] throwingActions = {
57	() -> r.ints(2, 1),
58	() -> r.ints(10, 42, 42),
59	() -> r.longs(-1L, -1L),
60	() -> r.longs(10, 1L, -2L),
61	() -> r.doubles(0.0, 0.0),
62	() -> r.doubles(10, .5, .4),
63	};
64	assertThrows(IllegalArgumentException.class, throwingActions);
65	}
66
67	/**
68	* A parallel sized stream of ints generates the given number of values
69	*/
70	public void testIntsCount() {
71	LongAdder counter = new LongAdder();
72	ThreadLocalRandom r = ThreadLocalRandom.current();
73	long size = 0;
74	for (int reps = 0; reps < REPS; ++reps) {
75	counter.reset();
76	r.ints(size).parallel().forEach(x -> counter.increment());
77	assertEquals(size, counter.sum());
78	size += 524959;
79	}
80	}
81
82	/**
83	* A parallel sized stream of longs generates the given number of values
84	*/
85	public void testLongsCount() {
86	LongAdder counter = new LongAdder();
87	ThreadLocalRandom r = ThreadLocalRandom.current();
88	long size = 0;
89	for (int reps = 0; reps < REPS; ++reps) {
90	counter.reset();
91	r.longs(size).parallel().forEach(x -> counter.increment());
92	assertEquals(size, counter.sum());
93	size += 524959;
94	}
95	}
96
97	/**
98	* A parallel sized stream of doubles generates the given number of values
99	*/
100	public void testDoublesCount() {
101	LongAdder counter = new LongAdder();
102	ThreadLocalRandom r = ThreadLocalRandom.current();
103	long size = 0;
104	for (int reps = 0; reps < REPS; ++reps) {
105	counter.reset();
106	r.doubles(size).parallel().forEach(x -> counter.increment());
107	assertEquals(size, counter.sum());
108	size += 524959;
109	}
110	}
111
112	/**
113	* Each of a parallel sized stream of bounded ints is within bounds
114	*/
115	public void testBoundedInts() {
116	AtomicInteger fails = new AtomicInteger(0);
117	ThreadLocalRandom r = ThreadLocalRandom.current();
118	long size = 12345L;
119	for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
120	for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
121	final int lo = least, hi = bound;
122	r.ints(size, lo, hi).parallel().
123	forEach(x -> {if (x < lo \|\| x >= hi)
124	fails.getAndIncrement(); });
125	}
126	}
127	assertEquals(0, fails.get());
128	}
129
130	/**
131	* Each of a parallel sized stream of bounded longs is within bounds
132	*/
133	public void testBoundedLongs() {
134	AtomicInteger fails = new AtomicInteger(0);
135	ThreadLocalRandom r = ThreadLocalRandom.current();
136	long size = 123L;
137	for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
138	for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
139	final long lo = least, hi = bound;
140	r.longs(size, lo, hi).parallel().
141	forEach(x -> {if (x < lo \|\| x >= hi)
142	fails.getAndIncrement(); });
143	}
144	}
145	assertEquals(0, fails.get());
146	}
147
148	/**
149	* Each of a parallel sized stream of bounded doubles is within bounds
150	*/
151	public void testBoundedDoubles() {
152	AtomicInteger fails = new AtomicInteger(0);
153	ThreadLocalRandom r = ThreadLocalRandom.current();
154	long size = 456;
155	for (double least = 0.00011; least < 1.0e20; least *= 9) {
156	for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
157	final double lo = least, hi = bound;
158	r.doubles(size, lo, hi).parallel().
159	forEach(x -> {if (x < lo \|\| x >= hi)
160	fails.getAndIncrement(); });
161	}
162	}
163	assertEquals(0, fails.get());
164	}
165
166	/**
167	* A parallel unsized stream of ints generates at least 100 values
168	*/
169	public void testUnsizedIntsCount() {
170	LongAdder counter = new LongAdder();
171	ThreadLocalRandom r = ThreadLocalRandom.current();
172	long size = 100;
173	r.ints().limit(size).parallel().forEach(x -> counter.increment());
174	assertEquals(size, counter.sum());
175	}
176
177	/**
178	* A parallel unsized stream of longs generates at least 100 values
179	*/
180	public void testUnsizedLongsCount() {
181	LongAdder counter = new LongAdder();
182	ThreadLocalRandom r = ThreadLocalRandom.current();
183	long size = 100;
184	r.longs().limit(size).parallel().forEach(x -> counter.increment());
185	assertEquals(size, counter.sum());
186	}
187
188	/**
189	* A parallel unsized stream of doubles generates at least 100 values
190	*/
191	public void testUnsizedDoublesCount() {
192	LongAdder counter = new LongAdder();
193	ThreadLocalRandom r = ThreadLocalRandom.current();
194	long size = 100;
195	r.doubles().limit(size).parallel().forEach(x -> counter.increment());
196	assertEquals(size, counter.sum());
197	}
198
199	/**
200	* A sequential unsized stream of ints generates at least 100 values
201	*/
202	public void testUnsizedIntsCountSeq() {
203	LongAdder counter = new LongAdder();
204	ThreadLocalRandom r = ThreadLocalRandom.current();
205	long size = 100;
206	r.ints().limit(size).forEach(x -> counter.increment());
207	assertEquals(size, counter.sum());
208	}
209
210	/**
211	* A sequential unsized stream of longs generates at least 100 values
212	*/
213	public void testUnsizedLongsCountSeq() {
214	LongAdder counter = new LongAdder();
215	ThreadLocalRandom r = ThreadLocalRandom.current();
216	long size = 100;
217	r.longs().limit(size).forEach(x -> counter.increment());
218	assertEquals(size, counter.sum());
219	}
220
221	/**
222	* A sequential unsized stream of doubles generates at least 100 values
223	*/
224	public void testUnsizedDoublesCountSeq() {
225	LongAdder counter = new LongAdder();
226	ThreadLocalRandom r = ThreadLocalRandom.current();
227	long size = 100;
228	r.doubles().limit(size).forEach(x -> counter.increment());
229	assertEquals(size, counter.sum());
230	}
231
232	}