1 /*
2 * Copyright (c) 2008, 2013, 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 * @key randomness
29 */
30
31 import java.util.*;
32 import java.util.concurrent.*;
33
34 /**
35 * Based on the strange scenario required to reproduce
36 * (coll) IdentityHashMap.iterator().remove() might decrement size twice
37 *
38 * It would be good to add more "Lockstep-style" tests to this file.
39 */
40 public class LockStep {
41 void mapsEqual(Map m1, Map m2) {
42 equal(m1, m2);
43 equal(m2, m1);
44 equal(m1.size(), m2.size());
45 equal(m1.isEmpty(), m2.isEmpty());
46 equal(m1.keySet(), m2.keySet());
47 equal(m2.keySet(), m1.keySet());
48 }
49
50 void mapsEqual(List<Map> maps) {
51 Map first = maps.get(0);
52 for (Map map : maps)
53 mapsEqual(first, map);
54 }
55
56 void put(List<Map> maps, Object key, Object val) {
57 for (Map map : maps)
58 map.put(key, val);
59 mapsEqual(maps);
60 }
61
62 void removeLastTwo(List<Map> maps) {
63 Map first = maps.get(0);
64 int size = first.size();
65 Iterator fit = first.keySet().iterator();
66 for (int j = 0; j < size - 2; j++)
67 fit.next();
68 Object x1 = fit.next();
69 Object x2 = fit.next();
70
71 for (Map map : maps) {
72 Iterator it = map.keySet().iterator();
73 while (it.hasNext()) {
74 Object x = it.next();
75 if (x == x1 || x == x2)
76 it.remove();
77 }
78 }
79 mapsEqual(maps);
80 }
81
82 void remove(Map m, Iterator it) {
83 int size = m.size();
84 it.remove();
85 if (m.size() != size-1)
86 throw new Error(String.format("Incorrect size!%nmap=%s, size=%d%n",
87 m.toString(), m.size()));
88 }
89
90 void test(String[] args) throws Throwable {
91 final int iterations = 100;
92 final Random r = new Random();
93
94 for (int i = 0; i < iterations; i++) {
95 List<Map> maps = Arrays.asList(
96 new Map[] {
97 new IdentityHashMap(11),
98 new HashMap(16),
99 new LinkedHashMap(16),
100 new WeakHashMap(16),
101 new Hashtable(16),
102 new TreeMap(),
103 new ConcurrentHashMap(16),
104 new ConcurrentSkipListMap(),
105 Collections.checkedMap(new HashMap(16), Integer.class, Integer.class),
106 Collections.checkedSortedMap(new TreeMap(), Integer.class, Integer.class),
107 Collections.checkedNavigableMap(new TreeMap(), Integer.class, Integer.class),
108 Collections.synchronizedMap(new HashMap(16)),
109 Collections.synchronizedSortedMap(new TreeMap()),
110 Collections.synchronizedNavigableMap(new TreeMap())
111 });
112
113 for (int j = 0; j < 10; j++)
114 put(maps, r.nextInt(100), r.nextInt(100));
115 removeLastTwo(maps);
116 }
117 }
118
119 //--------------------- Infrastructure ---------------------------
120 volatile int passed = 0, failed = 0;
121 void pass() {passed++;}
122 void fail() {failed++; Thread.dumpStack();}
123 void fail(String msg) {System.err.println(msg); fail();}
124 void unexpected(Throwable t) {failed++; t.printStackTrace();}
125 void check(boolean cond) {if (cond) pass(); else fail();}
126 void equal(Object x, Object y) {
127 if (x == null ? y == null : x.equals(y)) pass();
128 else fail(x + " not equal to " + y);}
129 public static void main(String[] args) throws Throwable {
130 new LockStep().instanceMain(args);}
131 void instanceMain(String[] args) throws Throwable {
132 try {test(args);} catch (Throwable t) {unexpected(t);}
133 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
134 if (failed > 0) throw new AssertionError("Some tests failed");}
135 }