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