russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
96 lines
3.3 KiB
Java
96 lines
3.3 KiB
Java
/*
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* Copyright (c) 2024, 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.awt.event.ActionListener;
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import java.awt.event.ActionEvent;
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import java.awt.AWTEventMulticaster;
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/*
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* @test
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* @bug 8342782
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* @summary Tests large AWTEventMulticasters for StackOverflowErrors
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* @run main LargeAWTEventMulticasterTest
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*/
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public class LargeAWTEventMulticasterTest {
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/**
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* This is an empty ActionListener that also has a numeric index.
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*/
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static class IndexedActionListener implements ActionListener {
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private final int index;
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public IndexedActionListener(int index) {
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this.index = index;
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}
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@Override
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public void actionPerformed(ActionEvent e) {
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}
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public int getIndex() {
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return index;
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}
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@Override
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public String toString() {
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return Integer.toString(index);
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}
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}
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public static void main(String[] args) {
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int maxA = 0;
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try {
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for (int a = 1; a < 200_000; a *= 2) {
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maxA = a;
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testAddingActionListener(a);
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}
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} finally {
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System.out.println("maximum a = " + maxA);
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}
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}
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private static void testAddingActionListener(int numberOfListeners) {
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// step 1: create the large AWTEventMulticaster
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ActionListener l = null;
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for (int a = 0; a < numberOfListeners; a++) {
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l = AWTEventMulticaster.add(l, new IndexedActionListener(a));
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}
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// Prior to 8342782 we could CREATE a large AWTEventMulticaster, but we couldn't
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// always interact with it.
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// step 2: dispatch an event
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// Here we're making sure we don't get a StackOverflowError when we traverse the tree:
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l.actionPerformed(null);
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// step 3: make sure getListeners() returns elements in the correct order
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// The resolution for 8342782 introduced a `rebalance` method; we want to
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// double-check that the rebalanced tree preserves the appropriate order.
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IndexedActionListener[] array = AWTEventMulticaster.getListeners(l, IndexedActionListener.class);
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for (int b = 0; b < array.length; b++) {
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if (b != array[b].getIndex())
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throw new Error("the listeners are in the wrong order. " + b + " != " + array[b].getIndex());
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}
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}
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}
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