| 1 |
/* |
| 2 |
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. |
| 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 |
* |
| 5 |
* This code is free software; you can redistribute it and/or modify it |
| 6 |
* under the terms of the GNU General Public License version 2 only, as |
| 7 |
* published by the Free Software Foundation. |
| 8 |
* |
| 9 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 |
* version 2 for more details (a copy is included in the LICENSE file that |
| 13 |
* accompanied this code). |
| 14 |
* |
| 15 |
* You should have received a copy of the GNU General Public License version |
| 16 |
* 2 along with this work; if not, write to the Free Software Foundation, |
| 17 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 |
* |
| 19 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 |
* or visit www.oracle.com if you need additional information or have any |
| 21 |
* questions. |
| 22 |
*/ |
| 23 |
|
| 24 |
/* |
| 25 |
* @test |
| 26 |
* @bug 6612102 |
| 27 |
* @summary Test Map implementations for mutual compatibility |
| 28 |
*/ |
| 29 |
|
| 30 |
import java.util.*; |
| 31 |
import java.util.concurrent.*; |
| 32 |
|
| 33 |
/** |
| 34 |
* Based on the strange scenario required to reproduce |
| 35 |
* (coll) IdentityHashMap.iterator().remove() might decrement size twice |
| 36 |
* |
| 37 |
* It would be good to add more "Lockstep-style" tests to this file. |
| 38 |
*/ |
| 39 |
public class LockStep { |
| 40 |
void mapsEqual(Map m1, Map m2) { |
| 41 |
equal(m1, m2); |
| 42 |
equal(m2, m1); |
| 43 |
equal(m1.size(), m2.size()); |
| 44 |
equal(m1.isEmpty(), m2.isEmpty()); |
| 45 |
equal(m1.keySet(), m2.keySet()); |
| 46 |
equal(m2.keySet(), m1.keySet()); |
| 47 |
} |
| 48 |
|
| 49 |
void mapsEqual(List<Map> maps) { |
| 50 |
Map first = maps.get(0); |
| 51 |
for (Map map : maps) |
| 52 |
mapsEqual(first, map); |
| 53 |
} |
| 54 |
|
| 55 |
void put(List<Map> maps, Object key, Object val) { |
| 56 |
for (Map map : maps) |
| 57 |
map.put(key, val); |
| 58 |
mapsEqual(maps); |
| 59 |
} |
| 60 |
|
| 61 |
void removeLastTwo(List<Map> maps) { |
| 62 |
Map first = maps.get(0); |
| 63 |
int size = first.size(); |
| 64 |
Iterator fit = first.keySet().iterator(); |
| 65 |
for (int j = 0; j < size - 2; j++) |
| 66 |
fit.next(); |
| 67 |
Object x1 = fit.next(); |
| 68 |
Object x2 = fit.next(); |
| 69 |
|
| 70 |
for (Map map : maps) { |
| 71 |
Iterator it = map.keySet().iterator(); |
| 72 |
while (it.hasNext()) { |
| 73 |
Object x = it.next(); |
| 74 |
if (x == x1 || x == x2) |
| 75 |
it.remove(); |
| 76 |
} |
| 77 |
} |
| 78 |
mapsEqual(maps); |
| 79 |
} |
| 80 |
|
| 81 |
void remove(Map m, Iterator it) { |
| 82 |
int size = m.size(); |
| 83 |
it.remove(); |
| 84 |
if (m.size() != size-1) |
| 85 |
throw new Error(String.format("Incorrect size!%nmap=%s, size=%d%n", |
| 86 |
m.toString(), m.size())); |
| 87 |
} |
| 88 |
|
| 89 |
void test(String[] args) throws Throwable { |
| 90 |
final int iterations = 100; |
| 91 |
final Random r = new Random(); |
| 92 |
|
| 93 |
for (int i = 0; i < iterations; i++) { |
| 94 |
List<Map> maps = Arrays.asList( |
| 95 |
new Map[] { |
| 96 |
new IdentityHashMap(11), |
| 97 |
new HashMap(16), |
| 98 |
new LinkedHashMap(16), |
| 99 |
new WeakHashMap(16), |
| 100 |
new Hashtable(16), |
| 101 |
new TreeMap(), |
| 102 |
new ConcurrentHashMap(16), |
| 103 |
new ConcurrentSkipListMap() }); |
| 104 |
|
| 105 |
for (int j = 0; j < 10; j++) |
| 106 |
put(maps, r.nextInt(100), r.nextInt(100)); |
| 107 |
removeLastTwo(maps); |
| 108 |
} |
| 109 |
} |
| 110 |
|
| 111 |
//--------------------- Infrastructure --------------------------- |
| 112 |
volatile int passed = 0, failed = 0; |
| 113 |
void pass() {passed++;} |
| 114 |
void fail() {failed++; Thread.dumpStack();} |
| 115 |
void fail(String msg) {System.err.println(msg); fail();} |
| 116 |
void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| 117 |
void check(boolean cond) {if (cond) pass(); else fail();} |
| 118 |
void equal(Object x, Object y) { |
| 119 |
if (x == null ? y == null : x.equals(y)) pass(); |
| 120 |
else fail(x + " not equal to " + y);} |
| 121 |
public static void main(String[] args) throws Throwable { |
| 122 |
new LockStep().instanceMain(args);} |
| 123 |
void instanceMain(String[] args) throws Throwable { |
| 124 |
try {test(args);} catch (Throwable t) {unexpected(t);} |
| 125 |
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| 126 |
if (failed > 0) throw new AssertionError("Some tests failed");} |
| 127 |
} |
