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.
80 lines
3 KiB
Java
80 lines
3 KiB
Java
/*
|
|
* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
import java.io.ByteArrayInputStream;
|
|
import java.util.Arrays;
|
|
import java.util.concurrent.atomic.AtomicBoolean;
|
|
import java.util.prefs.Preferences;
|
|
|
|
import jdk.jshell.tool.JavaShellToolBuilder;
|
|
import org.junit.jupiter.api.Assertions;
|
|
import org.junit.jupiter.api.Test;
|
|
|
|
/*
|
|
* @test
|
|
* @bug 8347418
|
|
* @summary Verify that loading of JShell history doesn't lead to a
|
|
* NullPointerException when the Preferences are modified concurrently.
|
|
* @run junit ConcurrentHistoryLoadingTest
|
|
*/
|
|
public class ConcurrentHistoryLoadingTest {
|
|
|
|
private static final String HISTORY_LINE_PREFIX = "HISTORY_LINE_";
|
|
|
|
@Test
|
|
public void testConcurrentHistoryLoading() throws Throwable {
|
|
AtomicBoolean removeOnAccess = new AtomicBoolean();
|
|
Preferences testPrefs = new ReplToolTesting.MemoryPreferences() {
|
|
@Override
|
|
protected String getSpi(String key) {
|
|
String result = super.getSpi(key);
|
|
if (key.startsWith(HISTORY_LINE_PREFIX) && removeOnAccess.getAndSet(false)) {
|
|
for (String key2Remote : keysSpi()) {
|
|
remove(key2Remote);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
};
|
|
StringBuilder input = new StringBuilder();
|
|
int max = 10;
|
|
for (int j = 0; j < max; j++) {
|
|
input.append("int x").append(j).append(" = 42\n");
|
|
}
|
|
JavaShellToolBuilder
|
|
.builder()
|
|
.persistence(testPrefs)
|
|
.in(new ByteArrayInputStream(input.toString().getBytes()), null)
|
|
.start();
|
|
Assertions.assertEquals(10, Arrays.stream(testPrefs.keys())
|
|
.filter(key -> key.startsWith(HISTORY_LINE_PREFIX))
|
|
.count());
|
|
removeOnAccess.set(true);
|
|
JavaShellToolBuilder
|
|
.builder()
|
|
.persistence(testPrefs)
|
|
.in(new ByteArrayInputStream(input.toString().getBytes()), null)
|
|
.start();
|
|
|
|
}
|
|
}
|