102 lines
3.3 KiB
Java
102 lines
3.3 KiB
Java
/*
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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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* @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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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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public class ConcurrentModification {
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static volatile int passed = 0, failed = 0;
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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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static void unexpected(Throwable t) {
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failed++;
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t.printStackTrace();
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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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static void check(boolean condition) {
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check(condition, "Assertion failed");
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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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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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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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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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}
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