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/*
* Copyright (c) 2005, 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 6312056 4155650 4294891 4904074
* @summary Reasonable things should happen if mutating while iterating.
*/
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
public class ConcurrentModification {
static volatile int passed = 0, failed = 0;
static void fail(String msg) {
failed++;
new AssertionError(msg).printStackTrace();
}
static void unexpected(Throwable t) {
failed++;
t.printStackTrace();
}
static void check(boolean condition, String msg) {
if (condition)
passed++;
else
fail(msg);
}
static void check(boolean condition) {
check(condition, "Assertion failed");
}
private static void test(ConcurrentMap<Integer, Integer> m)
{
try {
m.clear();
check(m.isEmpty());
m.put(1,2);
Iterator<Map.Entry<Integer,Integer>> it = m.entrySet().iterator();
if (it.hasNext()) {
m.remove(1); // sneaky
Map.Entry<Integer, Integer> e = it.next();
check(m.isEmpty());
check(e.getKey() == 1);
check(e.getValue() == 2);
}
} catch (Throwable t) {unexpected(t);}
try {
m.clear();
check(m.isEmpty());
m.put(1,2);
Iterator<Map.Entry<Integer,Integer>> it = m.entrySet().iterator();
if (it.hasNext()) {
m.put(1,3); // sneaky
Map.Entry<Integer, Integer> e = it.next();
check(e.getKey() == 1);
check(e.getValue() == 2 || e.getValue() == 3);
if (m instanceof ConcurrentHashMap) {
e.setValue(4);
check(m.get(1) == 4);
}
}
} catch (Throwable t) {unexpected(t);}
}
public static void main(String[] args) {
test(new ConcurrentHashMap<Integer,Integer>());
test(new ConcurrentSkipListMap<Integer,Integer>());
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new Error("Some tests failed");
}
}
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