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/*
* Copyright (c) 2020, 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 virtual threads using core reflection
* @modules java.base/java.lang:+open
* @library /test/lib
* @run junit Reflection
*/
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.locks.LockSupport;
import jdk.test.lib.thread.VThreadRunner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
import static org.junit.jupiter.api.Assumptions.*;
class Reflection {
/**
* Test invoking static method.
*/
@Test
void testInvokeStatic1() throws Exception {
VThreadRunner.run(() -> {
int result = (int) divideMethod().invoke(null, 20, 2);
assertTrue(result == 10);
});
}
/**
* Test that InvocationTargetException is thrown when a static method throws
* exception.
*/
@Test
void testInvokeStatic2() throws Exception {
VThreadRunner.run(() -> {
try {
divideMethod().invoke(null, 20, 0);
fail();
} catch (InvocationTargetException e) {
assertTrue(e.getCause() instanceof ArithmeticException);
}
});
}
/**
* Test that IllegalArgumentException is thrown when trying to invoke a static
* method with bad parameters.
*/
@Test
void testInvokeStatic3() throws Exception {
VThreadRunner.run(() -> {
assertThrows(IllegalArgumentException.class,
() -> divideMethod().invoke(null));
assertThrows(IllegalArgumentException.class,
() -> divideMethod().invoke(null, 1));
assertThrows(IllegalArgumentException.class,
() -> divideMethod().invoke(null, 1, 2, 3));
assertThrows(IllegalArgumentException.class,
() -> divideMethod().invoke(new Object()));
assertThrows(IllegalArgumentException.class,
() -> divideMethod().invoke(new Object(), 1));
assertThrows(IllegalArgumentException.class,
() -> divideMethod().invoke(new Object(), 1, 2, 3));
});
}
/**
* Test that ExceptionInInitializerError is thrown when invoking a static
* method triggers its class to be initialized and it fails with exception.
*/
@Test
void testInvokeStatic4() throws Exception {
VThreadRunner.run(() -> {
Method foo = BadClass1.class.getDeclaredMethod("foo");
try {
foo.invoke(null);
fail();
} catch (ExceptionInInitializerError e) {
assertTrue(e.getCause() instanceof ArithmeticException);
}
});
}
static class BadClass1 {
static {
if (1==1) throw new ArithmeticException();
}
static void foo() { }
}
/**
* Test that an error is thrown when invoking a static method triggers its
* class to be initialized and it fails with an error.
*/
@Test
void testInvokeStatic5() throws Exception {
VThreadRunner.run(() -> {
Method foo = BadClass2.class.getDeclaredMethod("foo");
assertThrows(AbstractMethodError.class, () -> foo.invoke(null));
});
}
static class BadClass2 {
static {
if (1==1) throw new AbstractMethodError();
}
static void foo() { }
}
/**
* Test that invoking a static method does not pin the carrier thread.
*/
@Test
void testInvokeStatic6() throws Exception {
assumeTrue(ThreadBuilders.supportsCustomScheduler(), "No support for custom schedulers");
Method parkMethod = Parker.class.getDeclaredMethod("park");
try (ExecutorService scheduler = Executors.newFixedThreadPool(1)) {
Thread.Builder builder = ThreadBuilders.virtualThreadBuilder(scheduler);
ThreadFactory factory = builder.factory();
var ready = new CountDownLatch(1);
Thread vthread = factory.newThread(() -> {
ready.countDown();
try {
parkMethod.invoke(null); // blocks
} catch (Exception e) { }
});
vthread.start();
try {
// wait for thread to run
ready.await();
// unpark with another virtual thread, runs on same carrier thread
Thread unparker = factory.newThread(() -> LockSupport.unpark(vthread));
unparker.start();
unparker.join();
} finally {
LockSupport.unpark(vthread); // in case test fails
}
}
}
/**
* Test invoking instance method.
*/
@Test
void testInvokeInstance1() throws Exception {
VThreadRunner.run(() -> {
var adder = new Adder();
Adder.addMethod().invoke(adder, 5);
assertTrue(adder.sum == 5);
});
}
/**
* Test that InvocationTargetException is thrown when an instance method throws
* exception.
*/
@Test
void testInvokeInstance2() throws Exception {
VThreadRunner.run(() -> {
var adder = new Adder();
try {
Adder.addMethod().invoke(adder, -5);
fail();
} catch (InvocationTargetException e) {
assertTrue(e.getCause() instanceof IllegalArgumentException);
}
});
}
/**
* Test that NullPointerException and IllegalArgumentException are thrown when
* trying to invoke an instance method with null or bad parameters.
*/
@Test
void testInvokeInstance3() throws Exception {
VThreadRunner.run(() -> {
var adder = new Adder();
Method addMethod = Adder.addMethod();
assertThrows(NullPointerException.class,
() -> addMethod.invoke(null));
assertThrows(IllegalArgumentException.class,
() -> addMethod.invoke(adder));
assertThrows(IllegalArgumentException.class,
() -> addMethod.invoke(adder, 1, 2));
assertThrows(IllegalArgumentException.class,
() -> addMethod.invoke(adder, 1, "hi"));
assertThrows(IllegalArgumentException.class,
() -> addMethod.invoke(adder, "hi"));
});
}
/**
* Test invoking newInstance to create an object.
*/
@Test
void testNewInstance1() throws Exception {
VThreadRunner.run(() -> {
Constructor<?> ctor = Adder.class.getDeclaredConstructor(long.class);
Adder adder = (Adder) ctor.newInstance(10);
assertTrue(adder.sum == 10);
});
}
/**
* Test that InvocationTargetException is thrown when a constructor throws
* exception.
*/
@Test
void testNewInstance2() throws Exception {
VThreadRunner.run(() -> {
Constructor<?> ctor = Adder.class.getDeclaredConstructor(long.class);
try {
ctor.newInstance(-10);
fail();
} catch (InvocationTargetException e) {
assertTrue(e.getCause() instanceof IllegalArgumentException);
}
});
}
/**
* Test that IllegalArgumentException is thrown when newInstacne is called
* with bad parameters.
*/
@Test
void testNewInstance3() throws Exception {
VThreadRunner.run(() -> {
var adder = new Adder();
Constructor<?> ctor = Adder.class.getDeclaredConstructor(long.class);
assertThrows(IllegalArgumentException.class,
() -> ctor.newInstance((Object[])null));
assertThrows(IllegalArgumentException.class,
() -> ctor.newInstance(adder));
assertThrows(IllegalArgumentException.class,
() -> ctor.newInstance(adder, null));
assertThrows(IllegalArgumentException.class,
() -> ctor.newInstance(adder, "foo"));
assertThrows(IllegalArgumentException.class,
() -> ctor.newInstance(adder, 1, 2));
});
}
/**
* Test that ExceptionInInitializerError is thrown when invoking newInstance
* triggers the class to be initialized and it fails with exception.
*/
@Test
void testNewInstance4() throws Exception {
VThreadRunner.run(() -> {
Constructor<?> ctor = BadClass3.class.getDeclaredConstructor();
try {
ctor.newInstance((Object[])null);
fail();
} catch (ExceptionInInitializerError e) {
assertTrue(e.getCause() instanceof ArithmeticException);
}
});
}
static class BadClass3 {
static {
if (1==1) throw new ArithmeticException();
}
static void foo() { }
}
/**
* Test that error is thrown when invoking newInstance triggers the class
* to be initialized and it fails with an error.
*/
@Test
void testNewInstance5() throws Exception {
VThreadRunner.run(() -> {
Constructor<?> ctor = BadClass4.class.getDeclaredConstructor();
assertThrows(AbstractMethodError.class, () -> ctor.newInstance((Object[])null));
});
}
static class BadClass4 {
static {
if (1==1) throw new AbstractMethodError();
}
static void foo() { }
}
/**
* Test that newInstance does not pin the carrier thread
*/
@Test
void testNewInstance6() throws Exception {
assumeTrue(ThreadBuilders.supportsCustomScheduler(), "No support for custom schedulers");
Constructor<?> ctor = Parker.class.getDeclaredConstructor();
try (ExecutorService scheduler = Executors.newFixedThreadPool(1)) {
Thread.Builder builder = ThreadBuilders.virtualThreadBuilder(scheduler);
ThreadFactory factory = builder.factory();
var ready = new CountDownLatch(1);
Thread vthread = factory.newThread(() -> {
ready.countDown();
try {
ctor.newInstance();
} catch (Exception e) { }
});
vthread.start();
try {
// wait for thread to run
ready.await();
// unpark with another virtual thread, runs on same carrier thread
Thread unparker = factory.newThread(() -> LockSupport.unpark(vthread));
unparker.start();
unparker.join();
} finally {
LockSupport.unpark(vthread); // in case test fails
}
}
}
// -- support classes and methods --
static int divide(int x, int y) {
return x / y;
}
static Method divideMethod() throws NoSuchMethodException {
return Reflection.class.getDeclaredMethod("divide", int.class, int.class);
}
static class Adder {
long sum;
Adder() { }
Adder(long x) {
if (x < 0)
throw new IllegalArgumentException();
sum = x;
}
Adder add(long x) {
if (x < 0)
throw new IllegalArgumentException();
sum += x;
return this;
}
static Method addMethod() throws NoSuchMethodException {
return Adder.class.getDeclaredMethod("add", long.class);
}
long sum() {
return sum;
}
}
static class Parker {
Parker() {
LockSupport.park();
}
static void park() {
LockSupport.park();
}
}
}
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