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/*
* Copyright (c) 2019, 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 8246774
* @summary Basic tests for serializing and deserializing record classes
* @run testng RecordClassTest
* @run testng/othervm/java.security.policy=empty_security.policy RecordClassTest
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.Serializable;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.System.out;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.fail;
/**
* Serializes and deserializes record classes. Ensures that the SUID is 0.
*/
public class RecordClassTest {
record Foo () implements Serializable { }
record Bar (int x) implements Serializable {
private static final long serialVersionUID = 987654321L;
}
record Baz (Foo foo, Bar bar, int i) implements Serializable { }
interface ThrowingExternalizable extends Externalizable {
default void writeExternal(ObjectOutput out) {
fail("should not reach here");
}
default void readExternal(ObjectInput in) {
fail("should not reach here");
}
}
record Wibble () implements ThrowingExternalizable {
private static final long serialVersionUID = 12345678L;
}
record Wobble (long l) implements ThrowingExternalizable { }
record Wubble (Wobble wobble, Wibble wibble, String s) implements ThrowingExternalizable { }
@DataProvider(name = "recordClasses")
public Object[][] recordClasses() {
return new Object[][] {
new Object[] { Foo.class , 0L },
new Object[] { Bar.class , 987654321L },
new Object[] { Baz.class , 0L },
new Object[] { Wibble.class , 12345678L },
new Object[] { Wobble.class , 0L },
new Object[] { Wubble.class , 0L },
};
}
/** Tests that the serialized and deserialized instances are equal. */
@Test(dataProvider = "recordClasses")
public void testClassSerialization(Class<?> recordClass, long unused)
throws Exception
{
out.println("\n---");
out.println("serializing : " + recordClass);
var deserializedClass = serializeDeserialize(recordClass);
out.println("deserialized: " + deserializedClass);
assertEquals(recordClass, deserializedClass);
assertEquals(deserializedClass, recordClass);
}
/** Tests that the SUID is always 0 unless explicitly declared. */
@Test(dataProvider = "recordClasses")
public void testSerialVersionUID(Class<?> recordClass, long expectedUID) {
out.println("\n---");
ObjectStreamClass osc = ObjectStreamClass.lookup(recordClass);
out.println("ObjectStreamClass::lookup : " + osc);
assertEquals(osc.getSerialVersionUID(), expectedUID);
osc = ObjectStreamClass.lookupAny(recordClass);
out.println("ObjectStreamClass::lookupAny: " + osc);
assertEquals(osc.getSerialVersionUID(), expectedUID);
}
// --- not Serializable
record NotSerializable1() { }
record NotSerializable2(int x) { }
record NotSerializable3<T>(T t) { }
@DataProvider(name = "notSerRecordClasses")
public Object[][] notSerRecordClasses() {
return new Object[][] {
new Object[] { NotSerializable1.class },
new Object[] { NotSerializable2.class },
new Object[] { NotSerializable3.class },
};
}
/** Tests that the generated SUID is always 0 for all non-Serializable record classes. */
@Test(dataProvider = "notSerRecordClasses")
public void testSerialVersionUIDNonSer(Class<?> recordClass) {
out.println("\n---");
ObjectStreamClass osc = ObjectStreamClass.lookup(recordClass);
out.println("ObjectStreamClass::lookup : " + osc);
assertEquals(osc, null);
osc = ObjectStreamClass.lookupAny(recordClass);
out.println("ObjectStreamClass::lookupAny: " + osc);
assertEquals(osc.getSerialVersionUID(), 0L);
}
// --- infra
static <T> byte[] serialize(T obj) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(obj);
oos.close();
return baos.toByteArray();
}
@SuppressWarnings("unchecked")
static <T> T deserialize(byte[] streamBytes)
throws IOException, ClassNotFoundException
{
ByteArrayInputStream bais = new ByteArrayInputStream(streamBytes);
ObjectInputStream ois = new ObjectInputStream(bais);
return (T) ois.readObject();
}
static <T> T serializeDeserialize(T obj)
throws IOException, ClassNotFoundException
{
return deserialize(serialize(obj));
}
}
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