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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
* @bug 8284199 8296779 8306647
* @summary Basic tests for StructuredTaskScope with scoped values
* @enablePreview
* @run junit WithScopedValue
*/
import java.util.concurrent.StructuredTaskScope;
import java.util.concurrent.StructuredTaskScope.Subtask;
import java.util.concurrent.StructureViolationException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Stream;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.*;
class WithScopedValue {
private static Stream<ThreadFactory> factories() {
return Stream.of(Thread.ofPlatform().factory(), Thread.ofVirtual().factory());
}
/**
* Test that fork inherits a scoped value into a child thread.
*/
@ParameterizedTest
@MethodSource("factories")
void testForkInheritsScopedValue1(ThreadFactory factory) throws Exception {
ScopedValue<String> name = ScopedValue.newInstance();
String value = ScopedValue.callWhere(name, "x", () -> {
try (var scope = new StructuredTaskScope<String>(null, factory)) {
Subtask<String> subtask = scope.fork(() -> {
return name.get(); // child should read "x"
});
scope.join();
return subtask.get();
}
});
assertEquals(value, "x");
}
/**
* Test that fork inherits a scoped value into a grandchild thread.
*/
@ParameterizedTest
@MethodSource("factories")
void testForkInheritsScopedValue2(ThreadFactory factory) throws Exception {
ScopedValue<String> name = ScopedValue.newInstance();
String value = ScopedValue.callWhere(name, "x", () -> {
try (var scope1 = new StructuredTaskScope<String>(null, factory)) {
Subtask<String> subtask1 = scope1.fork(() -> {
try (var scope2 = new StructuredTaskScope<String>(null, factory)) {
Subtask<String> subtask2 = scope2.fork(() -> {
return name.get(); // grandchild should read "x"
});
scope2.join();
return subtask2.get();
}
});
scope1.join();
return subtask1.get();
}
});
assertEquals(value, "x");
}
/**
* Test that fork inherits a rebound scoped value into a grandchild thread.
*/
@ParameterizedTest
@MethodSource("factories")
void testForkInheritsScopedValue3(ThreadFactory factory) throws Exception {
ScopedValue<String> name = ScopedValue.newInstance();
String value = ScopedValue.callWhere(name, "x", () -> {
try (var scope1 = new StructuredTaskScope<String>(null, factory)) {
Subtask<String> subtask1 = scope1.fork(() -> {
assertEquals(name.get(), "x"); // child should read "x"
// rebind name to "y"
String grandchildValue = ScopedValue.callWhere(name, "y", () -> {
try (var scope2 = new StructuredTaskScope<String>(null, factory)) {
Subtask<String> subtask2 = scope2.fork(() -> {
return name.get(); // grandchild should read "y"
});
scope2.join();
return subtask2.get();
}
});
assertEquals(name.get(), "x"); // child should read "x"
return grandchildValue;
});
scope1.join();
return subtask1.get();
}
});
assertEquals(value, "y");
}
/**
* Test exiting a dynamic scope with an open task scope.
*/
@Test
void testStructureViolation1() throws Exception {
ScopedValue<String> name = ScopedValue.newInstance();
class Box {
StructuredTaskScope<Object> scope;
}
var box = new Box();
try {
try {
ScopedValue.runWhere(name, "x", () -> {
box.scope = new StructuredTaskScope<Object>();
});
fail();
} catch (StructureViolationException expected) { }
// underlying flock should be closed and fork should fail to start a thread
StructuredTaskScope<Object> scope = box.scope;
AtomicBoolean ran = new AtomicBoolean();
Subtask<Object> subtask = scope.fork(() -> {
ran.set(true);
return null;
});
scope.join();
assertEquals(Subtask.State.UNAVAILABLE, subtask.state());
assertFalse(ran.get());
} finally {
StructuredTaskScope<Object> scope = box.scope;
if (scope != null) {
scope.close();
}
}
}
/**
* Test closing a StructuredTaskScope while executing in a dynamic scope.
*/
@Test
void testStructureViolation2() throws Exception {
ScopedValue<String> name = ScopedValue.newInstance();
try (var scope = new StructuredTaskScope<String>()) {
ScopedValue.runWhere(name, "x", () -> {
assertThrows(StructureViolationException.class, scope::close);
});
}
}
/**
* Test fork when a scoped value is bound after a StructuredTaskScope is created.
*/
@Test
void testStructureViolation3() throws Exception {
ScopedValue<String> name = ScopedValue.newInstance();
try (var scope = new StructuredTaskScope<String>()) {
ScopedValue.runWhere(name, "x", () -> {
assertThrows(StructureViolationException.class,
() -> scope.fork(() -> "foo"));
});
}
}
/**
* Test fork when a scoped value is re-bound after a StructuredTaskScope is created.
*/
@Test
void testStructureViolation4() throws Exception {
ScopedValue<String> name1 = ScopedValue.newInstance();
ScopedValue<String> name2 = ScopedValue.newInstance();
// rebind
ScopedValue.runWhere(name1, "x", () -> {
try (var scope = new StructuredTaskScope<String>()) {
ScopedValue.runWhere(name1, "y", () -> {
assertThrows(StructureViolationException.class,
() -> scope.fork(() -> "foo"));
});
}
});
// new binding
ScopedValue.runWhere(name1, "x", () -> {
try (var scope = new StructuredTaskScope<String>()) {
ScopedValue.runWhere(name2, "y", () -> {
assertThrows(StructureViolationException.class,
() -> scope.fork(() -> "foo"));
});
}
});
}
}
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