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/*
* Copyright (c) 2020, 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 8242451
* @library /test/lib
* @summary Test that the LAMBDA_INSTANCE$ field is present depending
* on disableEagerInitialization
* @run main LambdaEagerInitTest
* @run main/othervm -Djdk.internal.lambda.disableEagerInitialization=true LambdaEagerInitTest
*/
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import static jdk.test.lib.Asserts.*;
public class LambdaEagerInitTest {
interface H {Object m(String s);}
private static Set<String> allowedStaticFields(boolean nonCapturing) {
Set<String> s = new HashSet<>();
if (Boolean.getBoolean("jdk.internal.lambda.disableEagerInitialization")) {
if (nonCapturing) s.add("LAMBDA_INSTANCE$");
}
return s;
}
private void nonCapturingLambda() {
H la = s -> s;
assertEquals("hi", la.m("hi"));
Class<? extends H> c1 = la.getClass();
verifyLambdaClass(la.getClass(), true);
}
private void capturingLambda() {
H la = s -> concat(s, "foo");
assertEquals("hi foo", la.m("hi"));
verifyLambdaClass(la.getClass(), false);
}
private void verifyLambdaClass(Class<?> c, boolean nonCapturing) {
Set<String> staticFields = new HashSet<>();
Set<String> instanceFields = new HashSet<>();
for (Field f : c.getDeclaredFields()) {
if (Modifier.isStatic(f.getModifiers())) {
staticFields.add(f.getName());
} else {
instanceFields.add(f.getName());
}
}
assertEquals(instanceFields.size(), nonCapturing ? 0 : 1, "Unexpected instance fields");
assertEquals(staticFields, allowedStaticFields(nonCapturing), "Unexpected static fields");
}
private String concat(String... ss) {
return Arrays.stream(ss).collect(Collectors.joining(" "));
}
public static void main(String[] args) {
LambdaEagerInitTest test = new LambdaEagerInitTest();
test.nonCapturingLambda();
test.capturingLambda();
}
}
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