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/*
* Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8010122 8004518 8024331 8024688
* @summary Test Map default methods
* @author Mike Duigou
* @run testng Defaults
*/
import org.testng.Assert.ThrowingRunnable;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;
import static java.util.Objects.requireNonNull;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertNull;
import static org.testng.Assert.assertSame;
import static org.testng.Assert.assertThrows;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.fail;
public class Defaults {
@Test(dataProvider = "Map rw=all keys=withNull values=withNull")
public void testGetOrDefaultNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(null), description + ": null key absent");
assertNull(map.get(null), description + ": value not null");
assertSame(map.get(null), map.getOrDefault(null, EXTRA_VALUE), description + ": values should match");
}
@Test(dataProvider = "Map rw=all keys=all values=all")
public void testGetOrDefault(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(KEYS[1]), "expected key missing");
assertSame(map.get(KEYS[1]), map.getOrDefault(KEYS[1], EXTRA_VALUE), "values should match");
assertFalse(map.containsKey(EXTRA_KEY), "expected absent key");
assertSame(map.getOrDefault(EXTRA_KEY, EXTRA_VALUE), EXTRA_VALUE, "value not returned as default");
assertNull(map.getOrDefault(EXTRA_KEY, null), "null not returned as default");
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public void testPutIfAbsentNulls(String description, Map<IntegerEnum, String> map) {
// null -> null
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertNull(map.putIfAbsent(null, EXTRA_VALUE), "previous not null");
// null -> EXTRA_VALUE
assertTrue(map.containsKey(null), "null key absent");
assertSame(map.get(null), EXTRA_VALUE, "unexpected value");
assertSame(map.putIfAbsent(null, null), EXTRA_VALUE, "previous not expected value");
assertTrue(map.containsKey(null), "null key absent");
assertSame(map.get(null), EXTRA_VALUE, "unexpected value");
assertSame(map.remove(null), EXTRA_VALUE, "removed unexpected value");
// null -> <absent>
assertFalse(map.containsKey(null), description + ": key present after remove");
assertNull(map.putIfAbsent(null, null), "previous not null");
// null -> null
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertNull(map.putIfAbsent(null, EXTRA_VALUE), "previous not null");
assertSame(map.get(null), EXTRA_VALUE, "value not expected");
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testPutIfAbsent(String description, Map<IntegerEnum, String> map) {
// 1 -> 1
assertTrue(map.containsKey(KEYS[1]));
Object expected = map.get(KEYS[1]);
assertTrue(null == expected || expected == VALUES[1]);
assertSame(map.putIfAbsent(KEYS[1], EXTRA_VALUE), expected);
assertSame(map.get(KEYS[1]), expected);
// EXTRA_KEY -> <absent>
assertFalse(map.containsKey(EXTRA_KEY));
assertSame(map.putIfAbsent(EXTRA_KEY, EXTRA_VALUE), null);
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
assertSame(map.putIfAbsent(EXTRA_KEY, VALUES[2]), EXTRA_VALUE);
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
}
@Test(dataProvider = "Map rw=all keys=all values=all")
public void testForEach(String description, Map<IntegerEnum, String> map) {
IntegerEnum[] EACH_KEY = new IntegerEnum[map.size()];
map.forEach((k, v) -> {
int idx = (null == k) ? 0 : k.ordinal(); // substitute for index.
assertNull(EACH_KEY[idx]);
EACH_KEY[idx] = (idx == 0) ? KEYS[0] : k; // substitute for comparison.
assertSame(v, map.get(k));
});
assertEquals(KEYS, EACH_KEY, description);
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public static void testReplaceAll(String description, Map<IntegerEnum, String> map) {
IntegerEnum[] EACH_KEY = new IntegerEnum[map.size()];
Set<String> EACH_REPLACE = new HashSet<>(map.size());
map.replaceAll((k,v) -> {
int idx = (null == k) ? 0 : k.ordinal(); // substitute for index.
assertNull(EACH_KEY[idx]);
EACH_KEY[idx] = (idx == 0) ? KEYS[0] : k; // substitute for comparison.
assertSame(v, map.get(k));
String replacement = v + " replaced";
EACH_REPLACE.add(replacement);
return replacement;
});
assertEquals(KEYS, EACH_KEY, description);
assertEquals(map.values().size(), EACH_REPLACE.size(), description + EACH_REPLACE);
assertTrue(EACH_REPLACE.containsAll(map.values()), description + " : " + EACH_REPLACE + " != " + map.values());
assertTrue(map.values().containsAll(EACH_REPLACE), description + " : " + EACH_REPLACE + " != " + map.values());
}
@Test(dataProvider = "Map rw=true keys=nonNull values=nonNull")
public static void testReplaceAllNoNullReplacement(String description, Map<IntegerEnum, String> map) {
assertThrowsNPE(() -> map.replaceAll(null));
assertThrowsNPE(() -> map.replaceAll((k,v) -> null)); //should not allow replacement with null value
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public static void testRemoveNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertFalse(map.remove(null, EXTRA_VALUE), description);
assertTrue(map.containsKey(null));
assertNull(map.get(null));
assertTrue(map.remove(null, null));
assertFalse(map.containsKey(null));
assertNull(map.get(null));
assertFalse(map.remove(null, null));
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public static void testRemove(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(KEYS[1]));
Object expected = map.get(KEYS[1]);
assertTrue(null == expected || expected == VALUES[1]);
assertFalse(map.remove(KEYS[1], EXTRA_VALUE), description);
assertSame(map.get(KEYS[1]), expected);
assertTrue(map.remove(KEYS[1], expected));
assertNull(map.get(KEYS[1]));
assertFalse(map.remove(KEYS[1], expected));
assertFalse(map.containsKey(EXTRA_KEY));
assertFalse(map.remove(EXTRA_KEY, EXTRA_VALUE));
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public void testReplaceKVNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertSame(map.replace(null, EXTRA_VALUE), null);
assertSame(map.get(null), EXTRA_VALUE);
}
@Test(dataProvider = "Map rw=true keys=nonNull values=nonNull")
public void testReplaceKVNoNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(FIRST_KEY), "expected key missing");
assertSame(map.get(FIRST_KEY), FIRST_VALUE, "found wrong value");
assertThrowsNPE(() -> map.replace(FIRST_KEY, null));
assertSame(map.replace(FIRST_KEY, EXTRA_VALUE), FIRST_VALUE, description + ": replaced wrong value");
assertSame(map.get(FIRST_KEY), EXTRA_VALUE, "found wrong value");
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testReplaceKV(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(KEYS[1]));
Object expected = map.get(KEYS[1]);
assertTrue(null == expected || expected == VALUES[1]);
assertSame(map.replace(KEYS[1], EXTRA_VALUE), expected);
assertSame(map.get(KEYS[1]), EXTRA_VALUE);
assertFalse(map.containsKey(EXTRA_KEY));
assertNull(map.replace(EXTRA_KEY, EXTRA_VALUE));
assertFalse(map.containsKey(EXTRA_KEY));
assertNull(map.get(EXTRA_KEY));
assertNull(map.put(EXTRA_KEY, EXTRA_VALUE));
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
assertSame(map.replace(EXTRA_KEY, (String)expected), EXTRA_VALUE);
assertSame(map.get(EXTRA_KEY), expected);
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public void testReplaceKVVNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertFalse(map.replace(null, EXTRA_VALUE, EXTRA_VALUE));
assertNull(map.get(null));
assertTrue(map.replace(null, null, EXTRA_VALUE));
assertSame(map.get(null), EXTRA_VALUE);
assertTrue(map.replace(null, EXTRA_VALUE, EXTRA_VALUE));
assertSame(map.get(null), EXTRA_VALUE);
}
@Test(dataProvider = "Map rw=true keys=nonNull values=nonNull")
public void testReplaceKVVNoNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(FIRST_KEY), "expected key missing");
assertSame(map.get(FIRST_KEY), FIRST_VALUE, "found wrong value");
assertThrowsNPE(() -> map.replace(FIRST_KEY, FIRST_VALUE, null));
assertThrowsNPE(
() -> {
if (!map.replace(FIRST_KEY, null, EXTRA_VALUE)) {
throw new NullPointerException("default returns false rather than throwing");
}
});
assertTrue(map.replace(FIRST_KEY, FIRST_VALUE, EXTRA_VALUE), description + ": replaced wrong value");
assertSame(map.get(FIRST_KEY), EXTRA_VALUE, "found wrong value");
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testReplaceKVV(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(KEYS[1]));
Object expected = map.get(KEYS[1]);
assertTrue(null == expected || expected == VALUES[1]);
assertFalse(map.replace(KEYS[1], EXTRA_VALUE, EXTRA_VALUE));
assertSame(map.get(KEYS[1]), expected);
assertTrue(map.replace(KEYS[1], (String)expected, EXTRA_VALUE));
assertSame(map.get(KEYS[1]), EXTRA_VALUE);
assertTrue(map.replace(KEYS[1], EXTRA_VALUE, EXTRA_VALUE));
assertSame(map.get(KEYS[1]), EXTRA_VALUE);
assertFalse(map.containsKey(EXTRA_KEY));
assertFalse(map.replace(EXTRA_KEY, EXTRA_VALUE, EXTRA_VALUE));
assertFalse(map.containsKey(EXTRA_KEY));
assertNull(map.get(EXTRA_KEY));
assertNull(map.put(EXTRA_KEY, EXTRA_VALUE));
assertTrue(map.containsKey(EXTRA_KEY));
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
assertTrue(map.replace(EXTRA_KEY, EXTRA_VALUE, EXTRA_VALUE));
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public void testComputeIfAbsentNulls(String description, Map<IntegerEnum, String> map) {
// null -> null
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertSame(map.computeIfAbsent(null, (k) -> null), null, "not expected result");
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertSame(map.computeIfAbsent(null, (k) -> EXTRA_VALUE), EXTRA_VALUE, "not mapped to result");
// null -> EXTRA_VALUE
assertTrue(map.containsKey(null), "null key absent");
assertSame(map.get(null), EXTRA_VALUE, "not expected value");
assertSame(map.remove(null), EXTRA_VALUE, "removed unexpected value");
// null -> <absent>
assertFalse(map.containsKey(null), "null key present");
assertSame(map.computeIfAbsent(null, (k) -> EXTRA_VALUE), EXTRA_VALUE, "not mapped to result");
// null -> EXTRA_VALUE
assertTrue(map.containsKey(null), "null key absent");
assertSame(map.get(null), EXTRA_VALUE, "not expected value");
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testComputeIfAbsent(String description, Map<IntegerEnum, String> map) {
// 1 -> 1
assertTrue(map.containsKey(KEYS[1]));
Object expected = map.get(KEYS[1]);
assertTrue(null == expected || expected == VALUES[1], description + String.valueOf(expected));
expected = (null == expected) ? EXTRA_VALUE : expected;
assertSame(map.computeIfAbsent(KEYS[1], (k) -> EXTRA_VALUE), expected, description);
assertSame(map.get(KEYS[1]), expected, description);
// EXTRA_KEY -> <absent>
assertFalse(map.containsKey(EXTRA_KEY));
assertNull(map.computeIfAbsent(EXTRA_KEY, (k) -> null));
assertFalse(map.containsKey(EXTRA_KEY));
assertSame(map.computeIfAbsent(EXTRA_KEY, (k) -> EXTRA_VALUE), EXTRA_VALUE);
// EXTRA_KEY -> EXTRA_VALUE
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testComputeIfAbsentNullFunction(String description, Map<IntegerEnum, String> map) {
assertThrowsNPE(() -> map.computeIfAbsent(KEYS[1], null));
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public void testComputeIfPresentNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(null), description + ": null key absent");
assertNull(map.get(null), description + ": value not null");
assertSame(map.computeIfPresent(null, (k, v) -> {
fail(description + ": null value is not deemed present");
return EXTRA_VALUE;
}), null, description);
assertTrue(map.containsKey(null));
assertNull(map.get(null), description);
assertNull(map.remove(EXTRA_KEY), description + ": unexpected mapping");
assertNull(map.put(EXTRA_KEY, null), description + ": unexpected value");
assertSame(map.computeIfPresent(EXTRA_KEY, (k, v) -> {
fail(description + ": null value is not deemed present");
return EXTRA_VALUE;
}), null, description);
assertNull(map.get(EXTRA_KEY), description + ": null mapping gone");
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testComputeIfPresent(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(KEYS[1]));
Object value = map.get(KEYS[1]);
assertTrue(null == value || value == VALUES[1], description + String.valueOf(value));
Object expected = (null == value) ? null : EXTRA_VALUE;
assertSame(map.computeIfPresent(KEYS[1], (k, v) -> {
assertSame(v, value);
return EXTRA_VALUE;
}), expected, description);
assertSame(map.get(KEYS[1]), expected, description);
assertFalse(map.containsKey(EXTRA_KEY));
assertSame(map.computeIfPresent(EXTRA_KEY, (k, v) -> {
fail();
return EXTRA_VALUE;
}), null);
assertFalse(map.containsKey(EXTRA_KEY));
assertSame(map.get(EXTRA_KEY), null);
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testComputeIfPresentNullFunction(String description, Map<IntegerEnum, String> map) {
assertThrowsNPE(() -> map.computeIfPresent(KEYS[1], null));
}
@Test(dataProvider = "Map rw=true keys=withNull values=withNull")
public void testComputeNulls(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(null), "null key absent");
assertNull(map.get(null), "value not null");
assertSame(map.compute(null, (k, v) -> {
assertNull(k);
assertNull(v);
return null;
}), null, description);
assertFalse(map.containsKey(null), description + ": null key present.");
assertSame(map.compute(null, (k, v) -> {
assertSame(k, null);
assertNull(v);
return EXTRA_VALUE;
}), EXTRA_VALUE, description);
assertTrue(map.containsKey(null));
assertSame(map.get(null), EXTRA_VALUE, description);
assertSame(map.remove(null), EXTRA_VALUE, description + ": removed value not expected");
// no mapping before and after
assertFalse(map.containsKey(null), description + ": null key present");
assertSame(map.compute(null, (k, v) -> {
assertNull(k);
assertNull(v);
return null;
}), null, description + ": expected null result" );
assertFalse(map.containsKey(null), description + ": null key present");
// compute with map not containing value
assertNull(map.remove(EXTRA_KEY), description + ": unexpected mapping");
assertFalse(map.containsKey(EXTRA_KEY), description + ": key present");
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
assertSame(k, EXTRA_KEY);
assertNull(v);
return null;
}), null, description);
assertFalse(map.containsKey(EXTRA_KEY), description + ": null key present");
// ensure removal.
assertNull(map.put(EXTRA_KEY, EXTRA_VALUE));
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
assertSame(k, EXTRA_KEY);
assertSame(v, EXTRA_VALUE);
return null;
}), null, description + ": null resulted expected");
assertFalse(map.containsKey(EXTRA_KEY), description + ": null key present");
// compute with map containing null value
assertNull(map.put(EXTRA_KEY, null), description + ": unexpected value");
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
assertSame(k, EXTRA_KEY);
assertNull(v);
return null;
}), null, description);
assertFalse(map.containsKey(EXTRA_KEY), description + ": null key present");
assertNull(map.put(EXTRA_KEY, null), description + ": unexpected value");
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
assertSame(k, EXTRA_KEY);
assertNull(v);
return EXTRA_VALUE;
}), EXTRA_VALUE, description);
assertTrue(map.containsKey(EXTRA_KEY), "null key present");
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testCompute(String description, Map<IntegerEnum, String> map) {
assertTrue(map.containsKey(KEYS[1]));
Object value = map.get(KEYS[1]);
assertTrue(null == value || value == VALUES[1], description + String.valueOf(value));
assertSame(map.compute(KEYS[1], (k, v) -> {
assertSame(k, KEYS[1]);
assertSame(v, value);
return EXTRA_VALUE;
}), EXTRA_VALUE, description);
assertSame(map.get(KEYS[1]), EXTRA_VALUE, description);
assertNull(map.compute(KEYS[1], (k, v) -> {
assertSame(v, EXTRA_VALUE);
return null;
}), description);
assertFalse(map.containsKey(KEYS[1]));
assertFalse(map.containsKey(EXTRA_KEY));
assertSame(map.compute(EXTRA_KEY, (k, v) -> {
assertNull(v);
return EXTRA_VALUE;
}), EXTRA_VALUE);
assertTrue(map.containsKey(EXTRA_KEY));
assertSame(map.get(EXTRA_KEY), EXTRA_VALUE);
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testComputeNullFunction(String description, Map<IntegerEnum, String> map) {
assertThrowsNPE(() -> map.compute(KEYS[1], null));
}
@Test(dataProvider = "MergeCases")
private void testMerge(String description, Map<IntegerEnum, String> map, Merging.Value oldValue, Merging.Value newValue, Merging.Merger merger, Merging.Value put, Merging.Value result) {
// add and check initial conditions.
switch (oldValue) {
case ABSENT :
map.remove(EXTRA_KEY);
assertFalse(map.containsKey(EXTRA_KEY), "key not absent");
break;
case NULL :
map.put(EXTRA_KEY, null);
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
assertNull(map.get(EXTRA_KEY), "wrong value");
break;
case OLDVALUE :
map.put(EXTRA_KEY, VALUES[1]);
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
assertSame(map.get(EXTRA_KEY), VALUES[1], "wrong value");
break;
default:
fail("unexpected old value");
}
String returned = map.merge(EXTRA_KEY,
newValue == Merging.Value.NULL ? (String) null : VALUES[2],
merger
);
// check result
switch (result) {
case NULL :
assertNull(returned, "wrong value");
break;
case NEWVALUE :
assertSame(returned, VALUES[2], "wrong value");
break;
case RESULT :
assertSame(returned, VALUES[3], "wrong value");
break;
default:
fail("unexpected new value");
}
// check map
switch (put) {
case ABSENT :
assertFalse(map.containsKey(EXTRA_KEY), "key not absent");
break;
case NULL :
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
assertNull(map.get(EXTRA_KEY), "wrong value");
break;
case NEWVALUE :
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
assertSame(map.get(EXTRA_KEY), VALUES[2], "wrong value");
break;
case RESULT :
assertTrue(map.containsKey(EXTRA_KEY), "key absent");
assertSame(map.get(EXTRA_KEY), VALUES[3], "wrong value");
break;
default:
fail("unexpected new value");
}
}
@Test(dataProvider = "Map rw=true keys=all values=all")
public void testMergeNullMerger(String description, Map<IntegerEnum, String> map) {
assertThrowsNPE(() -> map.merge(KEYS[1], VALUES[1], null));
}
/** A function that flipflops between running two other functions. */
static <T,U,V> BiFunction<T,U,V> twoStep(AtomicBoolean b,
BiFunction<T,U,V> first,
BiFunction<T,U,V> second) {
return (t, u) -> {
boolean bb = b.get();
try {
return (b.get() ? first : second).apply(t, u);
} finally {
b.set(!bb);
}};
}
/**
* Simulates races by modifying the map within the mapping function.
*/
@Test
public void testConcurrentMap_computeIfAbsent_racy() {
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
final Long two = 2L;
Function<Long,Long> f, g;
// race not detected if function returns null
f = (k) -> { map.put(two, 42L); return null; };
assertNull(map.computeIfAbsent(two, f));
assertEquals(42L, (long)map.get(two));
map.clear();
f = (k) -> { map.put(two, 42L); return 86L; };
assertEquals(42L, (long)map.computeIfAbsent(two, f));
assertEquals(42L, (long)map.get(two));
// mapping function ignored if value already exists
map.put(two, 99L);
assertEquals(99L, (long)map.computeIfAbsent(two, f));
assertEquals(99L, (long)map.get(two));
}
/**
* Simulates races by modifying the map within the remapping function.
*/
@Test
public void testConcurrentMap_computeIfPresent_racy() {
final AtomicBoolean b = new AtomicBoolean(true);
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
final Long two = 2L;
BiFunction<Long,Long,Long> f, g;
for (Long val : new Long[] { null, 86L }) {
map.clear();
// Function not invoked if no mapping exists
f = (k, v) -> { map.put(two, 42L); return val; };
assertNull(map.computeIfPresent(two, f));
assertNull(map.get(two));
map.put(two, 42L);
f = (k, v) -> { map.put(two, 86L); return val; };
g = (k, v) -> {
assertSame(two, k);
assertEquals(86L, (long)v);
return null;
};
assertNull(map.computeIfPresent(two, twoStep(b, f, g)));
assertFalse(map.containsKey(two));
assertTrue(b.get());
map.put(two, 42L);
f = (k, v) -> { map.put(two, 86L); return val; };
g = (k, v) -> {
assertSame(two, k);
assertEquals(86L, (long)v);
return 99L;
};
assertEquals(99L, (long)map.computeIfPresent(two, twoStep(b, f, g)));
assertTrue(map.containsKey(two));
assertTrue(b.get());
}
}
@Test
public void testConcurrentMap_compute_simple() {
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
BiFunction<Long,Long,Long> fun = (k, v) -> ((v == null) ? 0L : k + v);
assertEquals(Long.valueOf(0L), map.compute(3L, fun));
assertEquals(Long.valueOf(3L), map.compute(3L, fun));
assertEquals(Long.valueOf(6L), map.compute(3L, fun));
assertNull(map.compute(3L, (k, v) -> null));
assertTrue(map.isEmpty());
assertEquals(Long.valueOf(0L), map.compute(new Long(3L), fun));
assertEquals(Long.valueOf(3L), map.compute(new Long(3L), fun));
assertEquals(Long.valueOf(6L), map.compute(new Long(3L), fun));
assertNull(map.compute(3L, (k, v) -> null));
assertTrue(map.isEmpty());
}
/**
* Simulates races by modifying the map within the remapping function.
*/
@Test
public void testConcurrentMap_compute_racy() {
final AtomicBoolean b = new AtomicBoolean(true);
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
final Long two = 2L;
BiFunction<Long,Long,Long> f, g;
// null -> null is a no-op; race not detected
f = (k, v) -> { map.put(two, 42L); return null; };
assertNull(map.compute(two, f));
assertEquals(42L, (long)map.get(two));
for (Long val : new Long[] { null, 86L }) {
map.clear();
f = (k, v) -> { map.put(two, 42L); return 86L; };
g = (k, v) -> {
assertSame(two, k);
assertEquals(42L, (long)v);
return k + v;
};
assertEquals(44L, (long)map.compute(two, twoStep(b, f, g)));
assertEquals(44L, (long)map.get(two));
assertTrue(b.get());
f = (k, v) -> { map.remove(two); return val; };
g = (k, v) -> {
assertSame(two, k);
assertNull(v);
return 44L;
};
assertEquals(44L, (long)map.compute(two, twoStep(b, f, g)));
assertEquals(44L, (long)map.get(two));
assertTrue(map.containsKey(two));
assertTrue(b.get());
f = (k, v) -> { map.remove(two); return val; };
g = (k, v) -> {
assertSame(two, k);
assertNull(v);
return null;
};
assertNull(map.compute(two, twoStep(b, f, g)));
assertNull(map.get(two));
assertFalse(map.containsKey(two));
assertTrue(b.get());
}
}
/**
* Simulates races by modifying the map within the remapping function.
*/
@Test
public void testConcurrentMap_merge_racy() {
final AtomicBoolean b = new AtomicBoolean(true);
final ConcurrentMap<Long,Long> map = new ImplementsConcurrentMap<>();
final Long two = 2L;
BiFunction<Long,Long,Long> f, g;
for (Long val : new Long[] { null, 86L }) {
map.clear();
f = (v, w) -> { throw new AssertionError(); };
assertEquals(99L, (long)map.merge(two, 99L, f));
assertEquals(99L, (long)map.get(two));
f = (v, w) -> { map.put(two, 42L); return val; };
g = (v, w) -> {
assertEquals(42L, (long)v);
assertEquals(3L, (long)w);
return v + w;
};
assertEquals(45L, (long)map.merge(two, 3L, twoStep(b, f, g)));
assertEquals(45L, (long)map.get(two));
assertTrue(b.get());
f = (v, w) -> { map.remove(two); return val; };
g = (k, v) -> { throw new AssertionError(); };
assertEquals(55L, (long)map.merge(two, 55L, twoStep(b, f, g)));
assertEquals(55L, (long)map.get(two));
assertTrue(map.containsKey(two));
assertFalse(b.get()); b.set(true);
}
}
public enum IntegerEnum {
e0, e1, e2, e3, e4, e5, e6, e7, e8, e9,
e10, e11, e12, e13, e14, e15, e16, e17, e18, e19,
e20, e21, e22, e23, e24, e25, e26, e27, e28, e29,
e30, e31, e32, e33, e34, e35, e36, e37, e38, e39,
e40, e41, e42, e43, e44, e45, e46, e47, e48, e49,
e50, e51, e52, e53, e54, e55, e56, e57, e58, e59,
e60, e61, e62, e63, e64, e65, e66, e67, e68, e69,
e70, e71, e72, e73, e74, e75, e76, e77, e78, e79,
e80, e81, e82, e83, e84, e85, e86, e87, e88, e89,
e90, e91, e92, e93, e94, e95, e96, e97, e98, e99,
EXTRA_KEY;
public static final int SIZE = values().length;
}
private static final int TEST_SIZE = IntegerEnum.SIZE - 1;
/**
* Realized keys ensure that there is always a hard ref to all test objects.
*/
private static final IntegerEnum[] KEYS = new IntegerEnum[TEST_SIZE];
/**
* Realized values ensure that there is always a hard ref to all test
* objects.
*/
private static final String[] VALUES = new String[TEST_SIZE];
static {
IntegerEnum[] keys = IntegerEnum.values();
for (int each = 0; each < TEST_SIZE; each++) {
KEYS[each] = keys[each];
VALUES[each] = String.valueOf(each);
}
}
private static final IntegerEnum FIRST_KEY = KEYS[0];
private static final String FIRST_VALUE = VALUES[0];
private static final IntegerEnum EXTRA_KEY = IntegerEnum.EXTRA_KEY;
private static final String EXTRA_VALUE = String.valueOf(TEST_SIZE);
@DataProvider(name = "Map rw=all keys=all values=all", parallel = true)
public static Iterator<Object[]> allMapProvider() {
return makeAllMaps().iterator();
}
@DataProvider(name = "Map rw=all keys=withNull values=withNull", parallel = true)
public static Iterator<Object[]> allMapWithNullsProvider() {
return makeAllMapsWithNulls().iterator();
}
@DataProvider(name = "Map rw=true keys=nonNull values=nonNull", parallel = true)
public static Iterator<Object[]> rwNonNullMapProvider() {
return makeRWNoNullsMaps().iterator();
}
@DataProvider(name = "Map rw=true keys=nonNull values=all", parallel = true)
public static Iterator<Object[]> rwNonNullKeysMapProvider() {
return makeRWMapsNoNulls().iterator();
}
@DataProvider(name = "Map rw=true keys=all values=all", parallel = true)
public static Iterator<Object[]> rwMapProvider() {
return makeAllRWMaps().iterator();
}
@DataProvider(name = "Map rw=true keys=withNull values=withNull", parallel = true)
public static Iterator<Object[]> rwNullsMapProvider() {
return makeAllRWMapsWithNulls().iterator();
}
private static Collection<Object[]> makeAllRWMapsWithNulls() {
Collection<Object[]> all = new ArrayList<>();
all.addAll(makeRWMaps(true, true));
return all;
}
private static Collection<Object[]> makeRWMapsNoNulls() {
Collection<Object[]> all = new ArrayList<>();
all.addAll(makeRWNoNullKeysMaps(false));
all.addAll(makeRWNoNullsMaps());
return all;
}
private static Collection<Object[]> makeAllROMaps() {
Collection<Object[]> all = new ArrayList<>();
all.addAll(makeROMaps(false));
all.addAll(makeROMaps(true));
return all;
}
private static Collection<Object[]> makeAllRWMaps() {
Collection<Object[]> all = new ArrayList<>();
all.addAll(makeRWNoNullsMaps());
all.addAll(makeRWMaps(false,true));
all.addAll(makeRWMaps(true,true));
all.addAll(makeRWNoNullKeysMaps(true));
return all;
}
private static Collection<Object[]> makeAllMaps() {
Collection<Object[]> all = new ArrayList<>();
all.addAll(makeAllROMaps());
all.addAll(makeAllRWMaps());
return all;
}
private static Collection<Object[]> makeAllMapsWithNulls() {
Collection<Object[]> all = new ArrayList<>();
all.addAll(makeROMaps(true));
all.addAll(makeRWMaps(true,true));
return all;
}
/**
* @param nullKeys include null keys
* @param nullValues include null values
* @return
*/
private static Collection<Object[]> makeRWMaps(boolean nullKeys, boolean nullValues) {
return Arrays.asList(
new Object[]{"HashMap", makeMap(HashMap::new, nullKeys, nullValues)},
new Object[]{"IdentityHashMap", makeMap(IdentityHashMap::new, nullKeys, nullValues)},
new Object[]{"LinkedHashMap", makeMap(LinkedHashMap::new, nullKeys, nullValues)},
new Object[]{"WeakHashMap", makeMap(WeakHashMap::new, nullKeys, nullValues)},
new Object[]{"Collections.checkedMap(HashMap)", Collections.checkedMap(makeMap(HashMap::new, nullKeys, nullValues), IntegerEnum.class, String.class)},
new Object[]{"Collections.synchronizedMap(HashMap)", Collections.synchronizedMap(makeMap(HashMap::new, nullKeys, nullValues))},
new Object[]{"ExtendsAbstractMap", makeMap(ExtendsAbstractMap::new, nullKeys, nullValues)});
}
/**
* @param nulls include null values
* @return
*/
private static Collection<Object[]> makeRWNoNullKeysMaps(boolean nulls) {
return Arrays.asList(
// null key hostile
new Object[]{"EnumMap", makeMap(() -> new EnumMap(IntegerEnum.class), false, nulls)},
new Object[]{"TreeMap", makeMap(TreeMap::new, false, nulls)},
new Object[]{"ExtendsAbstractMap(TreeMap)", makeMap(() -> {return new ExtendsAbstractMap(new TreeMap());}, false, nulls)},
new Object[]{"Collections.synchronizedMap(EnumMap)", Collections.synchronizedMap(makeMap(() -> new EnumMap(IntegerEnum.class), false, nulls))}
);
}
private static Collection<Object[]> makeRWNoNullsMaps() {
return Arrays.asList(
// null key and value hostile
new Object[]{"Hashtable", makeMap(Hashtable::new, false, false)},
new Object[]{"ConcurrentHashMap", makeMap(ConcurrentHashMap::new, false, false)},
new Object[]{"ConcurrentSkipListMap", makeMap(ConcurrentSkipListMap::new, false, false)},
new Object[]{"Collections.synchronizedMap(ConcurrentHashMap)", Collections.synchronizedMap(makeMap(ConcurrentHashMap::new, false, false))},
new Object[]{"Collections.checkedMap(ConcurrentHashMap)", Collections.checkedMap(makeMap(ConcurrentHashMap::new, false, false), IntegerEnum.class, String.class)},
new Object[]{"ExtendsAbstractMap(ConcurrentHashMap)", makeMap(() -> {return new ExtendsAbstractMap(new ConcurrentHashMap());}, false, false)},
new Object[]{"ImplementsConcurrentMap", makeMap(ImplementsConcurrentMap::new, false, false)}
);
}
/**
* @param nulls include nulls
* @return
*/
private static Collection<Object[]> makeROMaps(boolean nulls) {
return Arrays.asList(new Object[][]{
new Object[]{"Collections.unmodifiableMap(HashMap)", Collections.unmodifiableMap(makeMap(HashMap::new, nulls, nulls))}
});
}
/**
* @param supplier a supplier of mutable map instances.
*
* @param nullKeys include null keys
* @param nullValues include null values
* @return
*/
private static Map<IntegerEnum, String> makeMap(Supplier<Map<IntegerEnum, String>> supplier, boolean nullKeys, boolean nullValues) {
Map<IntegerEnum, String> result = supplier.get();
for (int each = 0; each < TEST_SIZE; each++) {
IntegerEnum key = nullKeys ? (each == 0) ? null : KEYS[each] : KEYS[each];
String value = nullValues ? (each == 0) ? null : VALUES[each] : VALUES[each];
result.put(key, value);
}
return result;
}
static class Merging {
public enum Value {
ABSENT,
NULL,
OLDVALUE,
NEWVALUE,
RESULT
}
public enum Merger implements BiFunction<String,String,String> {
UNUSED {
public String apply(String oldValue, String newValue) {
fail("should not be called");
return null;
}
},
NULL {
public String apply(String oldValue, String newValue) {
return null;
}
},
RESULT {
public String apply(String oldValue, String newValue) {
return VALUES[3];
}
},
}
}
@DataProvider(name = "MergeCases", parallel = true)
public Iterator<Object[]> mergeCasesProvider() {
Collection<Object[]> cases = new ArrayList<>();
cases.addAll(makeMergeTestCases());
return cases.iterator();
}
static Collection<Object[]> makeMergeTestCases() {
Collection<Object[]> cases = new ArrayList<>();
for (Object[] mapParams : makeAllRWMaps() ) {
cases.add(new Object[] { mapParams[0], mapParams[1], Merging.Value.ABSENT, Merging.Value.NEWVALUE, Merging.Merger.UNUSED, Merging.Value.NEWVALUE, Merging.Value.NEWVALUE });
}
for (Object[] mapParams : makeAllRWMaps() ) {
cases.add(new Object[] { mapParams[0], mapParams[1], Merging.Value.OLDVALUE, Merging.Value.NEWVALUE, Merging.Merger.NULL, Merging.Value.ABSENT, Merging.Value.NULL });
}
for (Object[] mapParams : makeAllRWMaps() ) {
cases.add(new Object[] { mapParams[0], mapParams[1], Merging.Value.OLDVALUE, Merging.Value.NEWVALUE, Merging.Merger.RESULT, Merging.Value.RESULT, Merging.Value.RESULT });
}
return cases;
}
public static void assertThrowsNPE(ThrowingRunnable r) {
assertThrows(NullPointerException.class, r);
}
/**
* A simple mutable map implementation that provides only default
* implementations of all methods. ie. none of the Map interface default
* methods have overridden implementations.
*
* @param <K> Type of keys
* @param <V> Type of values
*/
public static class ExtendsAbstractMap<M extends Map<K,V>, K, V> extends AbstractMap<K,V> {
protected final M map;
public ExtendsAbstractMap() { this( (M) new HashMap<K,V>()); }
protected ExtendsAbstractMap(M map) { this.map = map; }
@Override public Set<Map.Entry<K,V>> entrySet() {
return new AbstractSet<Map.Entry<K,V>>() {
@Override public int size() {
return map.size();
}
@Override public Iterator<Map.Entry<K,V>> iterator() {
final Iterator<Map.Entry<K,V>> source = map.entrySet().iterator();
return new Iterator<Map.Entry<K,V>>() {
public boolean hasNext() { return source.hasNext(); }
public Map.Entry<K,V> next() { return source.next(); }
public void remove() { source.remove(); }
};
}
@Override public boolean add(Map.Entry<K,V> e) {
return map.entrySet().add(e);
}
};
}
@Override public V put(K key, V value) {
return map.put(key, value);
}
}
/**
* A simple mutable concurrent map implementation that provides only default
* implementations of all methods, i.e. none of the ConcurrentMap interface
* default methods have overridden implementations.
*
* @param <K> Type of keys
* @param <V> Type of values
*/
public static class ImplementsConcurrentMap<K,V> extends ExtendsAbstractMap<ConcurrentMap<K,V>, K, V> implements ConcurrentMap<K,V> {
public ImplementsConcurrentMap() { super(new ConcurrentHashMap<K,V>()); }
// ConcurrentMap reabstracts these methods.
//
// Unlike ConcurrentHashMap, we have zero tolerance for null values.
@Override public V replace(K k, V v) {
return map.replace(requireNonNull(k), requireNonNull(v));
}
@Override public boolean replace(K k, V v, V vv) {
return map.replace(requireNonNull(k),
requireNonNull(v),
requireNonNull(vv));
}
@Override public boolean remove(Object k, Object v) {
return map.remove(requireNonNull(k), requireNonNull(v));
}
@Override public V putIfAbsent(K k, V v) {
return map.putIfAbsent(requireNonNull(k), requireNonNull(v));
}
}
}
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