dcevm/dcevm/src/test/java/org/dcevm/test/methods/ClassReflectionTest.java

/*
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 * 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
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package org.dcevm.test.methods;

import junit.framework.Assert;
import org.dcevm.test.TestUtil;
import org.junit.Before;
import org.junit.Test;

import java.lang.ref.SoftReference;
import java.lang.reflect.Method;

import static org.dcevm.test.util.HotSwapTestHelper.__toVersion__;
import static org.dcevm.test.util.HotSwapTestHelper.__version__;
import static org.junit.Assert.assertEquals;

/**
 * Testing correct reflection functionality after class redefinition.
 *
 * @author Thomas Wuerthinger
 */
public class ClassReflectionTest {

    @Before
    public void setUp() throws Exception {
        __toVersion__(0);
    }

    // Version 0
    public static class A {

        public int value() {
            return 1;
        }
    }

    public static class B extends A {

        @Override
        public int value() {
            return 2;
        }
    }

    public static class C extends A {

        @Override
        public int value() {
            return 3;
        }
    }

    // Version 1
    public static class A___1 {

        public int value() {
            return 1;
        }

        public int value2() {
            return 2;
        }
    }

    // Version 2
    public static class C___2 extends B {

        @Override
        public int value() {
            return super.value();
        }
    }

    private void assertIsSuper(Class<?> s, Class<?> c) {
        assertEquals(s, c.getSuperclass());
    }

    private void assertIsNotSuper(Class<?> s, Class<?> c) {
        Assert.assertFalse(s.equals(c.getSuperclass()));
    }

    @Test
    public void testClassReflection() {

        checkWeakReference();
        assert __version__() == 0;

        final A a = new A();
        final B b = new B();
        final C c = new C();

        assertIsSuper(A.class, B.class);
        assertIsSuper(A.class, C.class);
        assertIsNotSuper(B.class, C.class);

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertEquals(3, c.value());

        __toVersion__(2);

        assertIsSuper(A.class, B.class);
        assertIsSuper(B.class, C.class);
        assertIsNotSuper(A.class, C.class);

        assertEquals(1, a.value());
        assertEquals(2, b.value());
        assertEquals(2, c.value());

        TestUtil.assertUnsupportedWithLight(new Runnable() {
            @Override
            public void run() {
                __toVersion__(0);

                assertIsSuper(A.class, B.class);
                assertIsSuper(A.class, C.class);
                assertIsNotSuper(B.class, C.class);

                assertEquals(1, a.value());
                assertEquals(2, b.value());
                assertEquals(3, c.value());
            }
        });
    }

    public void checkWeakReference() {
        A a = new A();
        Class<?> strongRef = a.getClass();
        SoftReference<Class<?>> softRef = new SoftReference<Class<?>>(a.getClass());

        assertEquals(1, a.value());
        __toVersion__(1);
        assertEquals(1, a.value());
        Assert.assertTrue(strongRef == softRef.get());

        __toVersion__(0);
    }
}