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/*
* Copyright (c) 2023, 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.
*/
/**
* @test
* @summary Test diagnostic option for detecting a virtual thread using thread locals
* @requires vm.continuations
* @library /test/lib
* @run junit/othervm -Djdk.traceVirtualThreadLocals TraceVirtualThreadLocals
* @run junit/othervm -Djdk.traceVirtualThreadLocals=true TraceVirtualThreadLocals
*/
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import jdk.test.lib.thread.VThreadRunner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class TraceVirtualThreadLocals {
@Test
void testInitialValue() throws Exception {
String output = run(() -> {
ThreadLocal<String> name = new ThreadLocal<>() {
@Override
protected String initialValue() {
return "<unnamed>";
}
};
name.get();
});
assertContains(output, "java.lang.ThreadLocal.setInitialValue");
}
@Test
void testSet() throws Exception {
String output = run(() -> {
ThreadLocal<String> name = new ThreadLocal<>();
name.set("duke");
});
assertContains(output, "java.lang.ThreadLocal.set");
}
/**
* Run a task in a virtual thread, returning a String with any output printed
* to standard output.
*/
private static String run(Runnable task) throws Exception {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream original = System.out;
System.setOut(new PrintStream(baos, true));
try {
VThreadRunner.run(task::run);
} finally {
System.setOut(original);
}
String output = new String(baos.toByteArray());
System.out.println(output);
return output;
}
/**
* Tests that s1 contains s2.
*/
private static void assertContains(String s1, String s2) {
assertTrue(s1.contains(s2), s2 + " not found!!!");
}
}
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