112 lines
3.8 KiB
Java
112 lines
3.8 KiB
Java
/*
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* Copyright (c) 2014, 2021, 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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import java.io.*;
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import java.lang.reflect.Field;
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import java.util.Hashtable;
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/**
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* @test
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* @bug 8068427
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* @summary Hashtable deserialization reconstitutes table with wrong capacity
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* @modules java.base/java.util:open
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*/
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public class DeserializedLength {
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static boolean testDeserializedLength(int elements, float loadFactor) throws Exception {
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// construct Hashtable with minimal initial capacity and given loadFactor
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Hashtable<Integer, Integer> ht1 = new Hashtable<>(1, loadFactor);
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// add given number of unique elements
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for (int i = 0; i < elements; i++) {
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ht1.put(i, i);
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}
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// serialize and deserialize into a deep clone
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Hashtable<Integer, Integer> ht2 = serialClone(ht1);
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// compare lengths of internal tables
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Object[] table1 = (Object[]) hashtableTableField.get(ht1);
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Object[] table2 = (Object[]) hashtableTableField.get(ht2);
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assert table1 != null;
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assert table2 != null;
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int minLength = (int) (ht1.size() / loadFactor) + 1;
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int maxLength = minLength * 2;
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boolean ok = (table2.length >= minLength && table2.length <= maxLength);
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System.out.printf(
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"%7d %5.2f %7d %7d %7d...%7d %s\n",
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ht1.size(), loadFactor,
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table1.length, table2.length,
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minLength, maxLength,
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(ok ? "OK" : "NOT-OK")
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);
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return ok;
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}
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static <T> T serialClone(T o) throws IOException, ClassNotFoundException {
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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try (ObjectOutputStream oos = new ObjectOutputStream(bos)) {
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oos.writeObject(o);
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}
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@SuppressWarnings("unchecked")
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T clone = (T) new ObjectInputStream(
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new ByteArrayInputStream(bos.toByteArray())).readObject();
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return clone;
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}
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private static final Field hashtableTableField;
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static {
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try {
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hashtableTableField = Hashtable.class.getDeclaredField("table");
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hashtableTableField.setAccessible(true);
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} catch (NoSuchFieldException e) {
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throw new Error(e);
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}
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}
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public static void main(String[] args) throws Exception {
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boolean ok = true;
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System.out.printf("Results:\n" +
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" ser. deser.\n" +
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" size load lentgh length valid range ok?\n" +
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"------- ----- ------- ------- ----------------- ------\n"
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);
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for (int elements : new int[]{10, 50, 500, 5000}) {
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for (float loadFactor : new float[]{0.25f, 0.5f, 0.75f, 1.0f, 2.5f}) {
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ok &= testDeserializedLength(elements, loadFactor);
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}
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}
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if (!ok) {
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throw new AssertionError("Test failed.");
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}
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}
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}
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