/*
* 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.
*
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*/
/*
* @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");}
}