1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 */ 22 23 /* 24 * This file is available under and governed by the GNU General Public 25 * License version 2 only, as published by the Free Software Foundation. 26 * However, the following notice accompanied the original version of this 27 * file: 28 * 29 * Written by Doug Lea and Martin Buchholz with assistance from 30 * members of JCP JSR-166 Expert Group and released to the public 31 * domain, as explained at 32 * http://creativecommons.org/publicdomain/zero/1.0/ 33 */ 34 35 import junit.framework.Test; 36 37 import java.util.ArrayList; 38 import java.util.Iterator; 39 import java.util.List; 40 import java.util.Map; 41 import java.util.concurrent.ThreadLocalRandom; 42 43 /** 44 * Contains tests applicable to all Map implementations. 45 */ 46 public class MapTest extends JSR166TestCase { 47 final MapImplementation impl; 48 49 /** Tests are parameterized by a Map implementation. */ MapTest(MapImplementation impl, String methodName)50 MapTest(MapImplementation impl, String methodName) { 51 super(methodName); 52 this.impl = impl; 53 } 54 testSuite(MapImplementation impl)55 public static Test testSuite(MapImplementation impl) { 56 return newTestSuite( 57 parameterizedTestSuite(MapTest.class, 58 MapImplementation.class, 59 impl)); 60 } 61 testImplSanity()62 public void testImplSanity() { 63 final ThreadLocalRandom rnd = ThreadLocalRandom.current(); 64 { 65 Map m = impl.emptyMap(); 66 assertTrue(m.isEmpty()); 67 assertEquals(0, m.size()); 68 Object k = impl.makeKey(rnd.nextInt()); 69 Object v = impl.makeValue(rnd.nextInt()); 70 m.put(k, v); 71 assertFalse(m.isEmpty()); 72 assertEquals(1, m.size()); 73 assertTrue(m.containsKey(k)); 74 assertTrue(m.containsValue(v)); 75 } 76 { 77 Map m = impl.emptyMap(); 78 Object v = impl.makeValue(rnd.nextInt()); 79 if (impl.permitsNullKeys()) { 80 m.put(null, v); 81 assertTrue(m.containsKey(null)); 82 assertTrue(m.containsValue(v)); 83 } else { 84 assertThrows(NullPointerException.class, () -> m.put(null, v)); 85 } 86 } 87 { 88 Map m = impl.emptyMap(); 89 Object k = impl.makeKey(rnd.nextInt()); 90 if (impl.permitsNullValues()) { 91 m.put(k, null); 92 assertTrue(m.containsKey(k)); 93 assertTrue(m.containsValue(null)); 94 } else { 95 assertThrows(NullPointerException.class, () -> m.put(k, null)); 96 } 97 } 98 { 99 Map m = impl.emptyMap(); 100 Object k = impl.makeKey(rnd.nextInt()); 101 Object v1 = impl.makeValue(rnd.nextInt()); 102 Object v2 = impl.makeValue(rnd.nextInt()); 103 m.put(k, v1); 104 if (impl.supportsSetValue()) { 105 ((Map.Entry)(m.entrySet().iterator().next())).setValue(v2); 106 assertSame(v2, m.get(k)); 107 assertTrue(m.containsKey(k)); 108 assertTrue(m.containsValue(v2)); 109 assertFalse(m.containsValue(v1)); 110 } else { 111 assertThrows(UnsupportedOperationException.class, 112 () -> ((Map.Entry)(m.entrySet().iterator().next())).setValue(v2)); 113 } 114 } 115 } 116 117 /** 118 * Tests and extends the scenario reported in 119 * https://bugs.openjdk.java.net/browse/JDK-8186171 120 * HashMap: Entry.setValue may not work after Iterator.remove() called for previous entries 121 * ant -Djsr166.tckTestClass=HashMapTest -Djsr166.methodFilter=testBug8186171 -Djsr166.runsPerTest=1000 tck 122 */ testBug8186171()123 public void testBug8186171() { 124 if (!impl.supportsSetValue()) return; 125 final ThreadLocalRandom rnd = ThreadLocalRandom.current(); 126 final boolean permitsNullValues = impl.permitsNullValues(); 127 final Object v1 = (permitsNullValues && rnd.nextBoolean()) 128 ? null : impl.makeValue(1); 129 final Object v2 = (permitsNullValues && rnd.nextBoolean() && v1 != null) 130 ? null : impl.makeValue(2); 131 132 // If true, always lands in first bucket in hash tables. 133 final boolean poorHash = rnd.nextBoolean(); 134 class Key implements Comparable<Key> { 135 final int i; 136 Key(int i) { this.i = i; } 137 public int hashCode() { return poorHash ? 0 : super.hashCode(); } 138 public int compareTo(Key x) { 139 return Integer.compare(this.i, x.i); 140 } 141 } 142 143 // Both HashMap and ConcurrentHashMap have: 144 // TREEIFY_THRESHOLD = 8; UNTREEIFY_THRESHOLD = 6; 145 final int size = rnd.nextInt(1, 25); 146 147 List<Key> keys = new ArrayList<>(); 148 for (int i = size; i-->0; ) keys.add(new Key(i)); 149 Key keyToFrob = keys.get(rnd.nextInt(keys.size())); 150 151 Map<Key, Object> m = impl.emptyMap(); 152 for (Key key : keys) m.put(key, v1); 153 154 for (Iterator<Map.Entry<Key, Object>> it = m.entrySet().iterator(); 155 it.hasNext(); ) { 156 Map.Entry<Key, Object> entry = it.next(); 157 if (entry.getKey() == keyToFrob) 158 entry.setValue(v2); // does this have the expected effect? 159 else 160 it.remove(); 161 } 162 163 assertFalse(m.containsValue(v1)); 164 assertTrue(m.containsValue(v2)); 165 assertTrue(m.containsKey(keyToFrob)); 166 assertEquals(1, m.size()); 167 } 168 169 /** 170 * "Missing" test found while investigating JDK-8210280. 171 * ant -Djsr166.tckTestClass=HashMapTest -Djsr166.methodFilter=testBug8210280 -Djsr166.runsPerTest=1000000 tck 172 */ testBug8210280()173 public void testBug8210280() { 174 final ThreadLocalRandom rnd = ThreadLocalRandom.current(); 175 final int size1 = rnd.nextInt(32); 176 final int size2 = rnd.nextInt(128); 177 178 final Map m1 = impl.emptyMap(); 179 for (int i = 0; i < size1; i++) { 180 int elt = rnd.nextInt(1024 * i, 1024 * (i + 1)); 181 assertNull(m1.put(impl.makeKey(elt), impl.makeValue(elt))); 182 } 183 184 final Map m2 = impl.emptyMap(); 185 for (int i = 0; i < size2; i++) { 186 int elt = rnd.nextInt(Integer.MIN_VALUE + 1024 * i, 187 Integer.MIN_VALUE + 1024 * (i + 1)); 188 assertNull(m2.put(impl.makeKey(elt), impl.makeValue(-elt))); 189 } 190 191 final Map m1Copy = impl.emptyMap(); 192 m1Copy.putAll(m1); 193 194 m1.putAll(m2); 195 196 for (Object elt : m2.keySet()) 197 assertEquals(m2.get(elt), m1.get(elt)); 198 for (Object elt : m1Copy.keySet()) 199 assertSame(m1Copy.get(elt), m1.get(elt)); 200 assertEquals(size1 + size2, m1.size()); 201 } 202 203 /** 204 * 8222930: ConcurrentSkipListMap.clone() shares size variable between original and clone 205 */ testClone()206 public void testClone() { 207 final ThreadLocalRandom rnd = ThreadLocalRandom.current(); 208 final int size = rnd.nextInt(4); 209 final Map map = impl.emptyMap(); 210 for (int i = 0; i < size; i++) 211 map.put(impl.makeKey(i), impl.makeValue(i)); 212 final Map clone = cloneableClone(map); 213 if (clone == null) return; // not cloneable? 214 215 assertEquals(size, map.size()); 216 assertEquals(size, clone.size()); 217 assertEquals(map.isEmpty(), clone.isEmpty()); 218 219 clone.put(impl.makeKey(-1), impl.makeValue(-1)); 220 assertEquals(size, map.size()); 221 assertEquals(size + 1, clone.size()); 222 223 clone.clear(); 224 assertEquals(size, map.size()); 225 assertEquals(0, clone.size()); 226 assertTrue(clone.isEmpty()); 227 } 228 229 // public void testFailsIntentionallyForDebugging() { 230 // fail(impl.klazz().getSimpleName()); 231 // } 232 } 233