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/*
* Copyright (c) 2022, 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 Stress test ScopedValue with many bindings and rebindings
* @enablePreview
* @library /test/lib
* @key randomness
* @run junit ManyBindings
*/
import java.lang.ScopedValue.Carrier;
import java.util.Arrays;
import java.util.Objects;
import java.util.Random;
import jdk.test.lib.RandomFactory;
import jdk.test.lib.thread.VThreadRunner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class ManyBindings {
private static final Random RND = RandomFactory.getRandom();
// number of scoped values to create
private static final int SCOPED_VALUE_COUNT = 16;
// recursive depth to test
private static final int MAX_DEPTH = 24;
/**
* Stress test bindings on platform thread.
*/
@Test
void testPlatformThread() {
test();
}
/**
* Stress test bindings on virtual thread.
*/
@Test
void testVirtualThread() throws Exception {
VThreadRunner.run(() -> test());
}
/**
* Scoped value and its expected value (or null if not bound).
*/
record KeyAndValue<T>(ScopedValue<T> key, T value) {
KeyAndValue() {
this(ScopedValue.newInstance(), null);
}
}
/**
* Stress test bindings on current thread.
*/
private void test() {
KeyAndValue<Integer>[] array = new KeyAndValue[SCOPED_VALUE_COUNT];
for (int i = 0; i < array.length; i++) {
array[i] = new KeyAndValue<>();
}
test(array, 1);
}
/**
* Test that the scoped values in the array have the expected value, then
* recursively call this method with some of the scoped values bound to a
* new value.
*
* @param array the scoped values and their expected value
* @param depth current recurive depth
*/
private void test(KeyAndValue<Integer>[] array, int depth) {
if (depth > MAX_DEPTH)
return;
// check that the scoped values have the expected values
check(array);
// try to pollute the cache
lotsOfReads(array);
// create a Carrier to bind/rebind some of the scoped values
int len = array.length;
Carrier carrier = null;
KeyAndValue<Integer>[] newArray = Arrays.copyOf(array, len);
int n = Math.max(1, RND.nextInt(len / 2));
while (n > 0) {
int index = RND.nextInt(len);
ScopedValue<Integer> key = array[index].key;
int newValue = RND.nextInt();
if (carrier == null) {
carrier = ScopedValue.where(key, newValue);
} else {
carrier = carrier.where(key, newValue);
}
newArray[index] = new KeyAndValue<>(key, newValue);
n--;
}
// invoke recursively
carrier.run(() -> {
test(newArray, depth+1);
});
// check that the scoped values have the original values
check(array);
}
/**
* Check that the given scoped values have the expected value.
*/
private void check(KeyAndValue<Integer>[] array) {
for (int i = 0; i < array.length; i++) {
ScopedValue<Integer> key = array[i].key;
Integer value = array[i].value;
if (value == null) {
assertFalse(key.isBound());
} else {
assertEquals(value, key.get());
}
}
}
/**
* Do lots of reads of the scoped values, to pollute the SV cache.
*/
private void lotsOfReads(KeyAndValue<Integer>[] array) {
for (int k = 0; k < 1000; k++) {
int index = RND.nextInt(array.length);
Integer value = array[index].value;
if (value != null) {
ScopedValue<Integer> key = array[index].key;
assertEquals(value, key.get());
}
}
}
}
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