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/* |
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* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 6312056 4155650 4294891 4904074 |
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* @summary Reasonable things should happen if mutating while iterating. |
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*/ |
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|
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import java.util.Iterator; |
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import java.util.Map; |
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import java.util.concurrent.ConcurrentHashMap; |
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import java.util.concurrent.ConcurrentMap; |
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import java.util.concurrent.ConcurrentSkipListMap; |
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|
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public class ConcurrentModification { |
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static volatile int passed = 0, failed = 0; |
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|
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static void fail(String msg) { |
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failed++; |
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new AssertionError(msg).printStackTrace(); |
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} |
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|
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static void unexpected(Throwable t) { |
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failed++; |
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t.printStackTrace(); |
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} |
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|
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static void check(boolean condition, String msg) { |
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if (condition) |
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passed++; |
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else |
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fail(msg); |
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} |
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|
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static void check(boolean condition) { |
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check(condition, "Assertion failed"); |
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} |
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|
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private static void test(ConcurrentMap<Integer, Integer> m) |
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{ |
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try { |
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m.clear(); |
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check(m.isEmpty()); |
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m.put(1,2); |
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Iterator<Map.Entry<Integer,Integer>> it = m.entrySet().iterator(); |
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if (it.hasNext()) { |
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m.remove(1); // sneaky |
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Map.Entry<Integer, Integer> e = it.next(); |
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check(m.isEmpty()); |
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check(e.getKey() == 1); |
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check(e.getValue() == 2); |
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} |
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} catch (Throwable t) {unexpected(t);} |
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|
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try { |
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m.clear(); |
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check(m.isEmpty()); |
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m.put(1,2); |
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Iterator<Map.Entry<Integer,Integer>> it = m.entrySet().iterator(); |
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if (it.hasNext()) { |
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m.put(1,3); // sneaky |
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Map.Entry<Integer, Integer> e = it.next(); |
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check(e.getKey() == 1); |
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check(e.getValue() == 2 || e.getValue() == 3); |
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if (m instanceof ConcurrentHashMap) { |
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e.setValue(4); |
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check(m.get(1) == 4); |
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} |
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} |
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} catch (Throwable t) {unexpected(t);} |
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} |
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|
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public static void main(String[] args) { |
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test(new ConcurrentHashMap<Integer,Integer>()); |
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test(new ConcurrentSkipListMap<Integer,Integer>()); |
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|
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
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if (failed > 0) throw new Error("Some tests failed"); |
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} |
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} |
