| /* |
| * Copyright (c) 2008, 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 6612102 |
| * @summary Test Map implementations for mutual compatibility |
| */ |
| |
| import java.util.*; |
| import java.util.concurrent.*; |
| |
| /** |
| * Based on the strange scenario required to reproduce |
| * (coll) IdentityHashMap.iterator().remove() might decrement size twice |
| * |
| * It would be good to add more "Lockstep-style" tests to this file. |
| */ |
| public class LockStep { |
| void mapsEqual(Map m1, Map m2) { |
| equal(m1, m2); |
| equal(m2, m1); |
| equal(m1.size(), m2.size()); |
| equal(m1.isEmpty(), m2.isEmpty()); |
| equal(m1.keySet(), m2.keySet()); |
| equal(m2.keySet(), m1.keySet()); |
| } |
| |
| void mapsEqual(List<Map> maps) { |
| Map first = maps.get(0); |
| for (Map map : maps) |
| mapsEqual(first, map); |
| } |
| |
| void put(List<Map> maps, Object key, Object val) { |
| for (Map map : maps) |
| map.put(key, val); |
| mapsEqual(maps); |
| } |
| |
| void removeLastTwo(List<Map> maps) { |
| Map first = maps.get(0); |
| int size = first.size(); |
| Iterator fit = first.keySet().iterator(); |
| for (int j = 0; j < size - 2; j++) |
| fit.next(); |
| Object x1 = fit.next(); |
| Object x2 = fit.next(); |
| |
| for (Map map : maps) { |
| Iterator it = map.keySet().iterator(); |
| while (it.hasNext()) { |
| Object x = it.next(); |
| if (x == x1 || x == x2) |
| it.remove(); |
| } |
| } |
| mapsEqual(maps); |
| } |
| |
| void remove(Map m, Iterator it) { |
| int size = m.size(); |
| it.remove(); |
| if (m.size() != size-1) |
| throw new Error(String.format("Incorrect size!%nmap=%s, size=%d%n", |
| m.toString(), m.size())); |
| } |
| |
| void test(String[] args) throws Throwable { |
| final int iterations = 100; |
| final Random r = new Random(); |
| |
| for (int i = 0; i < iterations; i++) { |
| List<Map> maps = Arrays.asList( |
| new Map[] { |
| new IdentityHashMap(11), |
| new HashMap(16), |
| new LinkedHashMap(16), |
| new WeakHashMap(16), |
| new Hashtable(16), |
| new TreeMap(), |
| new ConcurrentHashMap(16), |
| new ConcurrentSkipListMap() }); |
| |
| for (int j = 0; j < 10; j++) |
| put(maps, r.nextInt(100), r.nextInt(100)); |
| removeLastTwo(maps); |
| } |
| } |
| |
| //--------------------- Infrastructure --------------------------- |
| volatile int passed = 0, failed = 0; |
| void pass() {passed++;} |
| void fail() {failed++; Thread.dumpStack();} |
| void fail(String msg) {System.err.println(msg); fail();} |
| void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| void check(boolean cond) {if (cond) pass(); else fail();} |
| void equal(Object x, Object y) { |
| if (x == null ? y == null : x.equals(y)) pass(); |
| else fail(x + " not equal to " + y);} |
| public static void main(String[] args) throws Throwable { |
| new LockStep().instanceMain(args);} |
| void instanceMain(String[] args) throws Throwable { |
| try {test(args);} catch (Throwable t) {unexpected(t);} |
| System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| if (failed > 0) throw new AssertionError("Some tests failed");} |
| } |