| /* |
| * 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"); |
| } |
| } |