84 lines
3.2 KiB
Java
84 lines
3.2 KiB
Java
/*
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* Copyright (c) 2019, 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 8209824
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* @summary per latest JDK code coverage report, 2 methods replaceStaleEntry
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* and prevIndex in ThreadLocal.ThreadLocalMap are not touched
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* by any JDK regression tests, this is to trigger the code paths.
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* @modules java.base/java.lang:+open
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* @run testng ReplaceStaleEntry
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*/
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import java.lang.reflect.Field;
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import java.util.HashMap;
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import java.util.Map;
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import static org.testng.Assert.assertEquals;
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import org.testng.annotations.BeforeClass;
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import org.testng.annotations.Test;
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public class ReplaceStaleEntry {
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public static int INITIAL_CAPACITY;
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@BeforeClass
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public static void setup() throws Exception {
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Class<?> clazz = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");
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Field f = clazz.getDeclaredField("INITIAL_CAPACITY");
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f.setAccessible(true);
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INITIAL_CAPACITY = f.getInt(null);
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System.out.println("INITIAL_CAPACITY: " + INITIAL_CAPACITY);
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}
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/**
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* This test triggers the code path to replaceStaleEntry, so as prevIndex is
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* triggered too as it's called by replaceStaleEntry.
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* The code paths must be triggered by reusing an already used entry in the
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* map's entry table. The code below
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* 1. first occupies the entries
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* 2. then expunges the entries by removing strong references to thread locals
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* 3. then reuse some of entries by adding more thread locals to the thread
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* and, the above steps are run for several times by adding more and more
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* thread locals, also trigger rehash of the map.
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*/
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@Test
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public static void test() {
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Map<Integer, ThreadLocal> locals = new HashMap<>();
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for (int j = 1; j < 32; j *= 2) {
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int loop = INITIAL_CAPACITY * j;
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for (int i = 0; i < loop; i++) {
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ThreadLocal l = new ThreadLocal<Integer>();
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l.set(i);
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locals.put(i, l);
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}
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locals.keySet().stream().forEach(i -> {
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assertEquals((int)locals.get(i).get(), (int)i, "Unexpected thread local value!");
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});
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locals.clear();
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System.gc();
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}
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}
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}
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