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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 8238763 8246774
* @summary ObjectInputStream readUnshared method handling of Records
* @run testng UnsharedTest
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.testng.annotations.Test;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.expectThrows;
/**
* Tests OOS::writeUnshared and OIS::readUnshared to verify that records
* are correctly unshared in the stream as appropriate.
*/
public class UnsharedTest {
record Foo(int x) implements Serializable { }
static final Class<InvalidObjectException> IOE = InvalidObjectException.class;
@Test
public void testReadUnshared() throws Exception {
var foo = new Foo(6);
{ // shared - sanity to ensure the second foo is a ref
var byteStream = serialize(foo, foo);
var foo1 = (Foo) deserializeOne(byteStream);
assertEquals(foo1.x, foo.x);
var foo2 = (Foo) deserializeOne(byteStream);
assertEquals(foo2.x, foo.x);
assertTrue(foo2 == foo1);
}
{ // unshared
var byteStream = serialize(foo, foo);
var foo1 = (Foo) deserializeOneUnshared(byteStream);
assertEquals(foo1.x, foo.x);
var expected = expectThrows(IOE, () -> deserializeOne(byteStream));
assertTrue(expected.getMessage().contains("cannot read back reference to unshared object"));
}
}
@Test
public void testWriteUnshared() throws Exception {
var foo = new Foo(7);
{ // shared - sanity to ensure the second foo is NOT a ref
var byteStream = serializeUnshared(foo, foo);
var foo1 = (Foo) deserializeOne(byteStream);
assertEquals(foo1.x, foo.x);
var foo2 = (Foo) deserializeOne(byteStream);
assertEquals(foo2.x, foo.x);
assertTrue(foo2 != foo1);
}
{ // unshared
var byteStream = serializeUnshared(foo, foo);
var foo1 = (Foo) deserializeOneUnshared(byteStream);
assertEquals(foo1.x, foo.x);
var foo2 = (Foo) deserializeOneUnshared(byteStream);
assertEquals(foo2.x, foo.x);
assertTrue(foo2 != foo1);
}
}
// ---
static ObjectInputStream serialize(Object... objs) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
for (Object obj : objs)
oos.writeObject(obj);
oos.close();
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
return new ObjectInputStream(bais);
}
static ObjectInputStream serializeUnshared(Object... objs) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
for (Object obj : objs)
oos.writeUnshared(obj);
oos.close();
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
return new ObjectInputStream(bais);
}
@SuppressWarnings("unchecked")
static Object deserializeOne(ObjectInputStream ois)
throws IOException, ClassNotFoundException
{
return ois.readObject();
}
@SuppressWarnings("unchecked")
static Object deserializeOneUnshared(ObjectInputStream ois)
throws IOException, ClassNotFoundException
{
return ois.readUnshared();
}
}
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