137 lines
4.3 KiB
Java
137 lines
4.3 KiB
Java
/*
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* Copyright (c) 2015, 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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* @bug 8140450
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* @library /test/lib
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* @summary Test if the getCallerClass method returns empty optional
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* @run main CallerFromMain exec
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*/
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.process.OutputAnalyzer;
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public class CallerFromMain {
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private static final StackWalker sw = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
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public static void main(String[] args) throws Exception {
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if (args.length > 0) {
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ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder("CallerFromMain");
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OutputAnalyzer output = ProcessTools.executeProcess(pb);
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System.out.println(output.getOutput());
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output.shouldHaveExitValue(0);
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return;
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}
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// StackWalker::getCallerClass
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// CallerFromMain::main
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// no caller
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try {
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Class<?> c = sw.getCallerClass();
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throw new RuntimeException("UOE not thrown. Caller: " + c);
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} catch (IllegalCallerException e) {}
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// StackWalker::getCallerClass
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// Runnable::run
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// Thread::run
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Thread t1 = new Thread(new Runnable() {
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@Override
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public void run() {
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Class<?> c = sw.getCallerClass();
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System.out.println("Call from Thread.run: " + c);
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assertThreadClassAsCaller(c);
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}
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});
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t1.setDaemon(true);
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t1.start();
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// StackWalker::getCallerClass
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// CallerFromMain::doit
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// Thread::run
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Thread t2 = new Thread(CallerFromMain::doit);
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t2.setDaemon(true);
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t2.start();
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// StackWalker::getCallerClass
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// MyRunnable::run
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// Thread::run
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Thread t3 = new Thread(new MyRunnable());
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t3.setDaemon(true);
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t3.start();
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// StackWalker::getCallerClass
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// Runnable::run
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// MyThread::run
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Thread t4 = new MyThread(new Runnable() {
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@Override
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public void run() {
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Class<?> c = sw.getCallerClass();
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System.out.println("Call from MyThread.run: " + c);
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if (c != MyThread.class) {
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throw new RuntimeException("Expected MyThread.class but got " + c);
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}
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}
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});
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t4.setDaemon(true);
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t4.start();
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t1.join();
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t2.join();
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t3.join();
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t4.join();
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}
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static class MyThread extends Thread {
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final Runnable runnable;
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MyThread(Runnable runnable) {
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super("MyThread");
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this.runnable = runnable;
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}
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public void run() {
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runnable.run();
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}
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}
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static class MyRunnable implements Runnable {
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@Override
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public void run() {
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Class<?> c = sw.getCallerClass();
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System.out.println("Call from Thread::run: " + c);
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assertThreadClassAsCaller(c);
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}
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}
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static void doit() {
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Class<?> c = sw.getCallerClass();
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System.out.println("Call from CallerFromMain.doit: " + c);
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assertThreadClassAsCaller(c);
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}
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static void assertThreadClassAsCaller(Class<?> caller) {
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if (caller != Thread.class) {
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throw new RuntimeException("Expected Thread.class but got " + caller);
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}
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}
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}
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