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Comparing jsr166/src/test/tck/ConcurrentHashMapTest.java (file contents):
Revision 1.23 by jsr166, Tue Mar 15 19:47:06 2011 UTC vs.
Revision 1.50 by jsr166, Mon Aug 22 18:38:28 2016 UTC

#	Line 6 | Line 6
6		* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
9	>	import java.util.ArrayList;
10	>	import java.util.Arrays;
11	>	import java.util.Collection;
12	>	import java.util.Collections;
13		import java.util.Enumeration;
14	<	import java.io.*;
14	>	import java.util.Iterator;
15	>	import java.util.Map;
16	>	import java.util.Random;
17	>	import java.util.Set;
18	>	import java.util.concurrent.ConcurrentHashMap;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.Executors;
21	>
22	>	import junit.framework.Test;
23	>	import junit.framework.TestSuite;
24
25		public class ConcurrentHashMapTest extends JSR166TestCase {
26		public static void main(String[] args) {
27	<	junit.textui.TestRunner.run(suite());
27	>	main(suite(), args);
28		}
29		public static Test suite() {
30		return new TestSuite(ConcurrentHashMapTest.class);
31		}
32
33		/**
34	<	* Create a map from Integers 1-5 to Strings "A"-"E".
34	>	* Returns a new map from Integers 1-5 to Strings "A"-"E".
35		*/
36	<	private static ConcurrentHashMap map5() {
37	<	ConcurrentHashMap map = new ConcurrentHashMap(5);
36	>	private static ConcurrentHashMap<Integer, String> map5() {
37	>	ConcurrentHashMap map = new ConcurrentHashMap<Integer, String>(5);
38		assertTrue(map.isEmpty());
39		map.put(one, "A");
40		map.put(two, "B");
#	Line 36 | Line 46 | public class ConcurrentHashMapTest exten
46		return map;
47		}
48
49	+	/** Re-implement Integer.compare for old java versions */
50	+	static int compare(int x, int y) {
51	+	return (x < y) ? -1 : (x > y) ? 1 : 0;
52	+	}
53	+
54	+	// classes for testing Comparable fallbacks
55	+	static class BI implements Comparable<BI> {
56	+	private final int value;
57	+	BI(int value) { this.value = value; }
58	+	public int compareTo(BI other) {
59	+	return compare(value, other.value);
60	+	}
61	+	public boolean equals(Object x) {
62	+	return (x instanceof BI) && ((BI)x).value == value;
63	+	}
64	+	public int hashCode() { return 42; }
65	+	}
66	+	static class CI extends BI { CI(int value) { super(value); } }
67	+	static class DI extends BI { DI(int value) { super(value); } }
68	+
69	+	static class BS implements Comparable<BS> {
70	+	private final String value;
71	+	BS(String value) { this.value = value; }
72	+	public int compareTo(BS other) {
73	+	return value.compareTo(other.value);
74	+	}
75	+	public boolean equals(Object x) {
76	+	return (x instanceof BS) && value.equals(((BS)x).value);
77	+	}
78	+	public int hashCode() { return 42; }
79	+	}
80	+
81	+	static class LexicographicList<E extends Comparable<E>> extends ArrayList<E>
82	+	implements Comparable<LexicographicList<E>> {
83	+	LexicographicList(Collection<E> c) { super(c); }
84	+	LexicographicList(E e) { super(Collections.singleton(e)); }
85	+	public int compareTo(LexicographicList<E> other) {
86	+	int common = Math.min(size(), other.size());
87	+	int r = 0;
88	+	for (int i = 0; i < common; i++) {
89	+	if ((r = get(i).compareTo(other.get(i))) != 0)
90	+	break;
91	+	}
92	+	if (r == 0)
93	+	r = compare(size(), other.size());
94	+	return r;
95	+	}
96	+	private static final long serialVersionUID = 0;
97	+	}
98	+
99	+	static class CollidingObject {
100	+	final String value;
101	+	CollidingObject(final String value) { this.value = value; }
102	+	public int hashCode() { return this.value.hashCode() & 1; }
103	+	public boolean equals(final Object obj) {
104	+	return (obj instanceof CollidingObject) && ((CollidingObject)obj).value.equals(value);
105	+	}
106	+	}
107	+
108	+	static class ComparableCollidingObject extends CollidingObject implements Comparable<ComparableCollidingObject> {
109	+	ComparableCollidingObject(final String value) { super(value); }
110	+	public int compareTo(final ComparableCollidingObject o) {
111	+	return value.compareTo(o.value);
112	+	}
113	+	}
114	+
115	+	/**
116	+	* Inserted elements that are subclasses of the same Comparable
117	+	* class are found.
118	+	*/
119	+	public void testComparableFamily() {
120	+	int size = 500;         // makes measured test run time -> 60ms
121	+	ConcurrentHashMap<BI, Boolean> m =
122	+	new ConcurrentHashMap<BI, Boolean>();
123	+	for (int i = 0; i < size; i++) {
124	+	assertTrue(m.put(new CI(i), true) == null);
125	+	}
126	+	for (int i = 0; i < size; i++) {
127	+	assertTrue(m.containsKey(new CI(i)));
128	+	assertTrue(m.containsKey(new DI(i)));
129	+	}
130	+	}
131	+
132	+	/**
133	+	* Elements of classes with erased generic type parameters based
134	+	* on Comparable can be inserted and found.
135	+	*/
136	+	public void testGenericComparable() {
137	+	int size = 120;         // makes measured test run time -> 60ms
138	+	ConcurrentHashMap<Object, Boolean> m =
139	+	new ConcurrentHashMap<Object, Boolean>();
140	+	for (int i = 0; i < size; i++) {
141	+	BI bi = new BI(i);
142	+	BS bs = new BS(String.valueOf(i));
143	+	LexicographicList<BI> bis = new LexicographicList<BI>(bi);
144	+	LexicographicList<BS> bss = new LexicographicList<BS>(bs);
145	+	assertTrue(m.putIfAbsent(bis, true) == null);
146	+	assertTrue(m.containsKey(bis));
147	+	if (m.putIfAbsent(bss, true) == null)
148	+	assertTrue(m.containsKey(bss));
149	+	assertTrue(m.containsKey(bis));
150	+	}
151	+	for (int i = 0; i < size; i++) {
152	+	assertTrue(m.containsKey(Collections.singletonList(new BI(i))));
153	+	}
154	+	}
155	+
156	+	/**
157	+	* Elements of non-comparable classes equal to those of classes
158	+	* with erased generic type parameters based on Comparable can be
159	+	* inserted and found.
160	+	*/
161	+	public void testGenericComparable2() {
162	+	int size = 500;         // makes measured test run time -> 60ms
163	+	ConcurrentHashMap<Object, Boolean> m =
164	+	new ConcurrentHashMap<Object, Boolean>();
165	+	for (int i = 0; i < size; i++) {
166	+	m.put(Collections.singletonList(new BI(i)), true);
167	+	}
168	+
169	+	for (int i = 0; i < size; i++) {
170	+	LexicographicList<BI> bis = new LexicographicList<BI>(new BI(i));
171	+	assertTrue(m.containsKey(bis));
172	+	}
173	+	}
174	+
175	+	/**
176	+	* Mixtures of instances of comparable and non-comparable classes
177	+	* can be inserted and found.
178	+	*/
179	+	public void testMixedComparable() {
180	+	int size = 1200;        // makes measured test run time -> 35ms
181	+	ConcurrentHashMap<Object, Object> map =
182	+	new ConcurrentHashMap<Object, Object>();
183	+	Random rng = new Random();
184	+	for (int i = 0; i < size; i++) {
185	+	Object x;
186	+	switch (rng.nextInt(4)) {
187	+	case 0:
188	+	x = new Object();
189	+	break;
190	+	case 1:
191	+	x = new CollidingObject(Integer.toString(i));
192	+	break;
193	+	default:
194	+	x = new ComparableCollidingObject(Integer.toString(i));
195	+	}
196	+	assertNull(map.put(x, x));
197	+	}
198	+	int count = 0;
199	+	for (Object k : map.keySet()) {
200	+	assertEquals(map.get(k), k);
201	+	++count;
202	+	}
203	+	assertEquals(count, size);
204	+	assertEquals(map.size(), size);
205	+	for (Object k : map.keySet()) {
206	+	assertEquals(map.put(k, k), k);
207	+	}
208	+	}
209	+
210		/**
211		* clear removes all pairs
212		*/
213		public void testClear() {
214		ConcurrentHashMap map = map5();
215		map.clear();
216	<	assertEquals(map.size(), 0);
216	>	assertEquals(0, map.size());
217		}
218
219		/**
#	Line 59 | Line 230 | public class ConcurrentHashMapTest exten
230		}
231
232		/**
233	+	* hashCode() equals sum of each key.hashCode ^ value.hashCode
234	+	*/
235	+	public void testHashCode() {
236	+	ConcurrentHashMap<Integer,String> map = map5();
237	+	int sum = 0;
238	+	for (Map.Entry<Integer,String> e : map.entrySet())
239	+	sum += e.getKey().hashCode() ^ e.getValue().hashCode();
240	+	assertEquals(sum, map.hashCode());
241	+	}
242	+
243	+	/**
244		* contains returns true for contained value
245		*/
246		public void testContains() {
#	Line 109 | Line 291 | public class ConcurrentHashMapTest exten
291		assertEquals("A", (String)map.get(one));
292		ConcurrentHashMap empty = new ConcurrentHashMap();
293		assertNull(map.get("anything"));
294	+	assertNull(empty.get("anything"));
295		}
296
297		/**
#	Line 150 | Line 333 | public class ConcurrentHashMapTest exten
333		}
334
335		/**
336	+	* Test keySet().removeAll on empty map
337	+	*/
338	+	public void testKeySet_empty_removeAll() {
339	+	ConcurrentHashMap<Integer, String> map = new ConcurrentHashMap<>();
340	+	Set<Integer> set = map.keySet();
341	+	set.removeAll(Collections.emptyList());
342	+	assertTrue(map.isEmpty());
343	+	assertTrue(set.isEmpty());
344	+	// following is test for JDK-8163353
345	+	set.removeAll(Collections.emptySet());
346	+	assertTrue(map.isEmpty());
347	+	assertTrue(set.isEmpty());
348	+	}
349	+
350	+	/**
351		* keySet.toArray returns contains all keys
352		*/
353		public void testKeySetToArray() {
#	Line 275 | Line 473 | public class ConcurrentHashMapTest exten
473		assertEquals("Z", map.get(one));
474		}
475
278	–
476		/**
477		* replace value fails when the given key not mapped to expected value
478		*/
#	Line 296 | Line 493 | public class ConcurrentHashMapTest exten
493		assertEquals("Z", map.get(one));
494		}
495
299	–
496		/**
497		* remove removes the correct key-value pair from the map
498		*/
#	Line 337 | Line 533 | public class ConcurrentHashMapTest exten
533		ConcurrentHashMap map = map5();
534		String s = map.toString();
535		for (int i = 1; i <= 5; ++i) {
536	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
536	>	assertTrue(s.contains(String.valueOf(i)));
537		}
538		}
539
540		// Exception tests
541
542		/**
543	<	* Cannot create with negative capacity
543	>	* Cannot create with only negative capacity
544		*/
545		public void testConstructor1() {
546		try {
547	<	new ConcurrentHashMap(-1,0,1);
547	>	new ConcurrentHashMap(-1);
548		shouldThrow();
549		} catch (IllegalArgumentException success) {}
550		}
551
552		/**
553	<	* Cannot create with negative concurrency level
553	>	* Constructor (initialCapacity, loadFactor) throws
554	>	* IllegalArgumentException if either argument is negative
555		*/
556		public void testConstructor2() {
557		try {
558	<	new ConcurrentHashMap(1,0,-1);
558	>	new ConcurrentHashMap(-1, .75f);
559	>	shouldThrow();
560	>	} catch (IllegalArgumentException success) {}
561	>
562	>	try {
563	>	new ConcurrentHashMap(16, -1);
564		shouldThrow();
565		} catch (IllegalArgumentException success) {}
566		}
567
568		/**
569	<	* Cannot create with only negative capacity
569	>	* Constructor (initialCapacity, loadFactor, concurrencyLevel)
570	>	* throws IllegalArgumentException if any argument is negative
571		*/
572		public void testConstructor3() {
573		try {
574	<	new ConcurrentHashMap(-1);
574	>	new ConcurrentHashMap(-1, .75f, 1);
575		shouldThrow();
576		} catch (IllegalArgumentException success) {}
577	+
578	+	try {
579	+	new ConcurrentHashMap(16, -1, 1);
580	+	shouldThrow();
581	+	} catch (IllegalArgumentException success) {}
582	+
583	+	try {
584	+	new ConcurrentHashMap(16, .75f, -1);
585	+	shouldThrow();
586	+	} catch (IllegalArgumentException success) {}
587	+	}
588	+
589	+	/**
590	+	* ConcurrentHashMap(map) throws NullPointerException if the given
591	+	* map is null
592	+	*/
593	+	public void testConstructor4() {
594	+	try {
595	+	new ConcurrentHashMap(null);
596	+	shouldThrow();
597	+	} catch (NullPointerException success) {}
598	+	}
599	+
600	+	/**
601	+	* ConcurrentHashMap(map) creates a new map with the same mappings
602	+	* as the given map
603	+	*/
604	+	public void testConstructor5() {
605	+	ConcurrentHashMap map1 = map5();
606	+	ConcurrentHashMap map2 = new ConcurrentHashMap(map5());
607	+	assertTrue(map2.equals(map1));
608	+	map2.put(one, "F");
609	+	assertFalse(map2.equals(map1));
610		}
611
612		/**
613		* get(null) throws NPE
614		*/
615		public void testGet_NullPointerException() {
616	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
617		try {
381	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
618		c.get(null);
619		shouldThrow();
620		} catch (NullPointerException success) {}
#	Line 388 | Line 624 | public class ConcurrentHashMapTest exten
624		* containsKey(null) throws NPE
625		*/
626		public void testContainsKey_NullPointerException() {
627	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
628		try {
392	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
629		c.containsKey(null);
630		shouldThrow();
631		} catch (NullPointerException success) {}
#	Line 399 | Line 635 | public class ConcurrentHashMapTest exten
635		* containsValue(null) throws NPE
636		*/
637		public void testContainsValue_NullPointerException() {
638	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
639		try {
403	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
640		c.containsValue(null);
641		shouldThrow();
642		} catch (NullPointerException success) {}
#	Line 410 | Line 646 | public class ConcurrentHashMapTest exten
646		* contains(null) throws NPE
647		*/
648		public void testContains_NullPointerException() {
649	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
650		try {
414	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
651		c.contains(null);
652		shouldThrow();
653		} catch (NullPointerException success) {}
#	Line 421 | Line 657 | public class ConcurrentHashMapTest exten
657		* put(null,x) throws NPE
658		*/
659		public void testPut1_NullPointerException() {
660	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
661		try {
425	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
662		c.put(null, "whatever");
663		shouldThrow();
664		} catch (NullPointerException success) {}
#	Line 432 | Line 668 | public class ConcurrentHashMapTest exten
668		* put(x, null) throws NPE
669		*/
670		public void testPut2_NullPointerException() {
671	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
672		try {
436	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
673		c.put("whatever", null);
674		shouldThrow();
675		} catch (NullPointerException success) {}
#	Line 443 | Line 679 | public class ConcurrentHashMapTest exten
679		* putIfAbsent(null, x) throws NPE
680		*/
681		public void testPutIfAbsent1_NullPointerException() {
682	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
683		try {
447	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
684		c.putIfAbsent(null, "whatever");
685		shouldThrow();
686		} catch (NullPointerException success) {}
#	Line 454 | Line 690 | public class ConcurrentHashMapTest exten
690		* replace(null, x) throws NPE
691		*/
692		public void testReplace_NullPointerException() {
693	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
694		try {
458	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
695		c.replace(null, "whatever");
696		shouldThrow();
697		} catch (NullPointerException success) {}
#	Line 465 | Line 701 | public class ConcurrentHashMapTest exten
701		* replace(null, x, y) throws NPE
702		*/
703		public void testReplaceValue_NullPointerException() {
704	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
705		try {
469	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
706		c.replace(null, one, "whatever");
707		shouldThrow();
708		} catch (NullPointerException success) {}
#	Line 476 | Line 712 | public class ConcurrentHashMapTest exten
712		* putIfAbsent(x, null) throws NPE
713		*/
714		public void testPutIfAbsent2_NullPointerException() {
715	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
716		try {
480	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
717		c.putIfAbsent("whatever", null);
718		shouldThrow();
719		} catch (NullPointerException success) {}
720		}
721
486	–
722		/**
723		* replace(x, null) throws NPE
724		*/
725		public void testReplace2_NullPointerException() {
726	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
727		try {
492	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
728		c.replace("whatever", null);
729		shouldThrow();
730		} catch (NullPointerException success) {}
#	Line 499 | Line 734 | public class ConcurrentHashMapTest exten
734		* replace(x, null, y) throws NPE
735		*/
736		public void testReplaceValue2_NullPointerException() {
737	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
738		try {
503	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
739		c.replace("whatever", null, "A");
740		shouldThrow();
741		} catch (NullPointerException success) {}
#	Line 510 | Line 745 | public class ConcurrentHashMapTest exten
745		* replace(x, y, null) throws NPE
746		*/
747		public void testReplaceValue3_NullPointerException() {
748	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
749		try {
514	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
750		c.replace("whatever", one, null);
751		shouldThrow();
752		} catch (NullPointerException success) {}
753		}
754
520	–
755		/**
756		* remove(null) throws NPE
757		*/
758		public void testRemove1_NullPointerException() {
759	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
760	+	c.put("sadsdf", "asdads");
761		try {
526	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
527	–	c.put("sadsdf", "asdads");
762		c.remove(null);
763		shouldThrow();
764		} catch (NullPointerException success) {}
#	Line 534 | Line 768 | public class ConcurrentHashMapTest exten
768		* remove(null, x) throws NPE
769		*/
770		public void testRemove2_NullPointerException() {
771	+	ConcurrentHashMap c = new ConcurrentHashMap(5);
772	+	c.put("sadsdf", "asdads");
773		try {
538	–	ConcurrentHashMap c = new ConcurrentHashMap(5);
539	–	c.put("sadsdf", "asdads");
774		c.remove(null, "whatever");
775		shouldThrow();
776		} catch (NullPointerException success) {}
#	Line 555 | Line 789 | public class ConcurrentHashMapTest exten
789		* A deserialized map equals original
790		*/
791		public void testSerialization() throws Exception {
792	<	ConcurrentHashMap q = map5();
792	>	Map x = map5();
793	>	Map y = serialClone(x);
794
795	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
796	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
797	<	out.writeObject(q);
798	<	out.close();
564	<
565	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
566	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
567	<	ConcurrentHashMap r = (ConcurrentHashMap)in.readObject();
568	<	assertEquals(q.size(), r.size());
569	<	assertTrue(q.equals(r));
570	<	assertTrue(r.equals(q));
795	>	assertNotSame(x, y);
796	>	assertEquals(x.size(), y.size());
797	>	assertEquals(x, y);
798	>	assertEquals(y, x);
799		}
800
573	–
801		/**
802		* SetValue of an EntrySet entry sets value in the map.
803		*/
#	Line 582 | Line 809 | public class ConcurrentHashMapTest exten
809		map.put(new Integer(i), new Integer(i));
810		assertFalse(map.isEmpty());
811		Map.Entry entry1 = (Map.Entry)map.entrySet().iterator().next();
812	+	// Unless it happens to be first (in which case remainder of
813	+	// test is skipped), remove a possibly-colliding key from map
814	+	// which, under some implementations, may cause entry1 to be
815	+	// cloned in map
816	+	if (!entry1.getKey().equals(new Integer(16))) {
817	+	map.remove(new Integer(16));
818	+	entry1.setValue("XYZ");
819	+	assertTrue(map.containsValue("XYZ")); // fails if write-through broken
820	+	}
821	+	}
822
823	<	// assert that entry1 is not 16
824	<	assertTrue("entry is 16, test not valid",
825	<	!entry1.getKey().equals(new Integer(16)));
826	<
827	<	// remove 16 (a different key) from map
828	<	// which just happens to cause entry1 to be cloned in map
829	<	map.remove(new Integer(16));
830	<	entry1.setValue("XYZ");
831	<	assertTrue(map.containsValue("XYZ")); // fails
823	>	/**
824	>	* Tests performance of removeAll when the other collection is much smaller.
825	>	* ant -Djsr166.tckTestClass=ConcurrentHashMapTest -Djsr166.methodFilter=testRemoveAll_performance -Djsr166.expensiveTests=true tck
826	>	*/
827	>	public void testRemoveAll_performance() {
828	>	final int mapSize = expensiveTests ? 1_000_000 : 100;
829	>	final int iterations = expensiveTests ? 500 : 2;
830	>	final ConcurrentHashMap<Integer, Integer> map = new ConcurrentHashMap<>();
831	>	for (int i = 0; i < mapSize; i++)
832	>	map.put(i, i);
833	>	Set<Integer> keySet = map.keySet();
834	>	Collection<Integer> removeMe = Arrays.asList(new Integer[] { -99, -86 });
835	>	for (int i = 0; i < iterations; i++)
836	>	assertFalse(keySet.removeAll(removeMe));
837	>	assertEquals(mapSize, map.size());
838	>	}
839	>
840	>	/**
841	>	* Tests performance of computeIfAbsent when the element is present.
842	>	* See JDK-8161372
843	>	* ant -Djsr166.tckTestClass=ConcurrentHashMapTest -Djsr166.methodFilter=testcomputeIfAbsent_performance -Djsr166.expensiveTests=true tck
844	>	*/
845	>	public void testcomputeIfAbsent_performance() {
846	>	final int mapSize = 20;
847	>	final int iterations = expensiveTests ? (1 << 23) : mapSize * 2;
848	>	final int threads = expensiveTests ? 10 : 2;
849	>	final ConcurrentHashMap<Integer, Integer> map = new ConcurrentHashMap<>();
850	>	for (int i = 0; i < mapSize; i++)
851	>	map.put(i, i);
852	>	final ExecutorService pool = Executors.newFixedThreadPool(2);
853	>	try (PoolCleaner cleaner = cleaner(pool)) {
854	>	Runnable r = new CheckedRunnable() {
855	>	public void realRun() {
856	>	int result = 0;
857	>	for (int i = 0; i < iterations; i++)
858	>	result += map.computeIfAbsent(i % mapSize, (k) -> k + k);
859	>	if (result == -42) throw new Error();
860	>	}};
861	>	for (int i = 0; i < threads; i++)
862	>	pool.execute(r);
863	>	}
864		}
865
866		}

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