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 junit.framework.*;
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.LongAdder;

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:	1.6
Committed:	Fri Sep 27 20:28:04 2013 UTC (10 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.5:	+18 -48 lines
Log Message:	use assertThrows
#	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	import junit.framework.*;
7	import java.util.*;
8	import java.util.concurrent.ThreadLocalRandom;
9	import java.util.concurrent.atomic.AtomicInteger;
10	import java.util.concurrent.atomic.LongAdder;
11
12	public class ThreadLocalRandom8Test extends JSR166TestCase {
13
14	public static void main(String[] args) {
15	junit.textui.TestRunner.run(suite());
16	}
17	public static Test suite() {
18	return new TestSuite(ThreadLocalRandom8Test.class);
19	}
20
21	// max sampled int bound
22	static final int MAX_INT_BOUND = (1 << 26);
23
24	// max sampled long bound
25	static final long MAX_LONG_BOUND = (1L << 42);
26
27	// Number of replications for other checks
28	static final int REPS =
29	Integer.getInteger("ThreadLocalRandom8Test.reps", 4);
30
31	/**
32	* Invoking sized ints, long, doubles, with negative sizes throws
33	* IllegalArgumentException
34	*/
35	public void testBadStreamSize() {
36	ThreadLocalRandom r = ThreadLocalRandom.current();
37	Runnable[] throwingActions = {
38	() -> r.ints(-1L),
39	() -> r.ints(-1L, 2, 3),
40	() -> r.longs(-1L),
41	() -> r.longs(-1L, -1L, 1L),
42	() -> r.doubles(-1L),
43	() -> r.doubles(-1L, .5, .6),
44	};
45	assertThrows(IllegalArgumentException.class, throwingActions);
46	}
47
48	/**
49	* Invoking bounded ints, long, doubles, with illegal bounds throws
50	* IllegalArgumentException
51	*/
52	public void testBadStreamBounds() {
53	ThreadLocalRandom r = ThreadLocalRandom.current();
54	Runnable[] throwingActions = {
55	() -> r.ints(2, 1),
56	() -> r.ints(10, 42, 42),
57	() -> r.longs(-1L, -1L),
58	() -> r.longs(10, 1L, -2L),
59	() -> r.doubles(0.0, 0.0),
60	() -> r.doubles(10, .5, .4),
61	};
62	assertThrows(IllegalArgumentException.class, throwingActions);
63	}
64
65	/**
66	* A parallel sized stream of ints generates the given number of values
67	*/
68	public void testIntsCount() {
69	LongAdder counter = new LongAdder();
70	ThreadLocalRandom r = ThreadLocalRandom.current();
71	long size = 0;
72	for (int reps = 0; reps < REPS; ++reps) {
73	counter.reset();
74	r.ints(size).parallel().forEach(x -> counter.increment());
75	assertEquals(size, counter.sum());
76	size += 524959;
77	}
78	}
79
80	/**
81	* A parallel sized stream of longs generates the given number of values
82	*/
83	public void testLongsCount() {
84	LongAdder counter = new LongAdder();
85	ThreadLocalRandom r = ThreadLocalRandom.current();
86	long size = 0;
87	for (int reps = 0; reps < REPS; ++reps) {
88	counter.reset();
89	r.longs(size).parallel().forEach(x -> counter.increment());
90	assertEquals(size, counter.sum());
91	size += 524959;
92	}
93	}
94
95	/**
96	* A parallel sized stream of doubles generates the given number of values
97	*/
98	public void testDoublesCount() {
99	LongAdder counter = new LongAdder();
100	ThreadLocalRandom r = ThreadLocalRandom.current();
101	long size = 0;
102	for (int reps = 0; reps < REPS; ++reps) {
103	counter.reset();
104	r.doubles(size).parallel().forEach(x -> counter.increment());
105	assertEquals(size, counter.sum());
106	size += 524959;
107	}
108	}
109
110	/**
111	* Each of a parallel sized stream of bounded ints is within bounds
112	*/
113	public void testBoundedInts() {
114	AtomicInteger fails = new AtomicInteger(0);
115	ThreadLocalRandom r = ThreadLocalRandom.current();
116	long size = 12345L;
117	for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
118	for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
119	final int lo = least, hi = bound;
120	r.ints(size, lo, hi).parallel().
121	forEach(x -> {if (x < lo \|\| x >= hi)
122	fails.getAndIncrement(); });
123	}
124	}
125	assertEquals(0, fails.get());
126	}
127
128	/**
129	* Each of a parallel sized stream of bounded longs is within bounds
130	*/
131	public void testBoundedLongs() {
132	AtomicInteger fails = new AtomicInteger(0);
133	ThreadLocalRandom r = ThreadLocalRandom.current();
134	long size = 123L;
135	for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
136	for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
137	final long lo = least, hi = bound;
138	r.longs(size, lo, hi).parallel().
139	forEach(x -> {if (x < lo \|\| x >= hi)
140	fails.getAndIncrement(); });
141	}
142	}
143	assertEquals(0, fails.get());
144	}
145
146	/**
147	* Each of a parallel sized stream of bounded doubles is within bounds
148	*/
149	public void testBoundedDoubles() {
150	AtomicInteger fails = new AtomicInteger(0);
151	ThreadLocalRandom r = ThreadLocalRandom.current();
152	long size = 456;
153	for (double least = 0.00011; least < 1.0e20; least *= 9) {
154	for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
155	final double lo = least, hi = bound;
156	r.doubles(size, lo, hi).parallel().
157	forEach(x -> {if (x < lo \|\| x >= hi)
158	fails.getAndIncrement(); });
159	}
160	}
161	assertEquals(0, fails.get());
162	}
163
164	/**
165	* A parallel unsized stream of ints generates at least 100 values
166	*/
167	public void testUnsizedIntsCount() {
168	LongAdder counter = new LongAdder();
169	ThreadLocalRandom r = ThreadLocalRandom.current();
170	long size = 100;
171	r.ints().limit(size).parallel().forEach(x -> counter.increment());
172	assertEquals(size, counter.sum());
173	}
174
175	/**
176	* A parallel unsized stream of longs generates at least 100 values
177	*/
178	public void testUnsizedLongsCount() {
179	LongAdder counter = new LongAdder();
180	ThreadLocalRandom r = ThreadLocalRandom.current();
181	long size = 100;
182	r.longs().limit(size).parallel().forEach(x -> counter.increment());
183	assertEquals(size, counter.sum());
184	}
185
186	/**
187	* A parallel unsized stream of doubles generates at least 100 values
188	*/
189	public void testUnsizedDoublesCount() {
190	LongAdder counter = new LongAdder();
191	ThreadLocalRandom r = ThreadLocalRandom.current();
192	long size = 100;
193	r.doubles().limit(size).parallel().forEach(x -> counter.increment());
194	assertEquals(size, counter.sum());
195	}
196
197	/**
198	* A sequential unsized stream of ints generates at least 100 values
199	*/
200	public void testUnsizedIntsCountSeq() {
201	LongAdder counter = new LongAdder();
202	ThreadLocalRandom r = ThreadLocalRandom.current();
203	long size = 100;
204	r.ints().limit(size).forEach(x -> counter.increment());
205	assertEquals(size, counter.sum());
206	}
207
208	/**
209	* A sequential unsized stream of longs generates at least 100 values
210	*/
211	public void testUnsizedLongsCountSeq() {
212	LongAdder counter = new LongAdder();
213	ThreadLocalRandom r = ThreadLocalRandom.current();
214	long size = 100;
215	r.longs().limit(size).forEach(x -> counter.increment());
216	assertEquals(size, counter.sum());
217	}
218
219	/**
220	* A sequential unsized stream of doubles generates at least 100 values
221	*/
222	public void testUnsizedDoublesCountSeq() {
223	LongAdder counter = new LongAdder();
224	ThreadLocalRandom r = ThreadLocalRandom.current();
225	long size = 100;
226	r.doubles().limit(size).forEach(x -> counter.increment());
227	assertEquals(size, counter.sum());
228	}
229
230	}