/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Salikh Zakirov
* @version $Revision: 1.6.28.4 $
*/
package gc;
import java.lang.ref.PhantomReference;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
/**
* @keyword ref
*/
public class PhantomReferenceTest {
// declare 'ref' static to be sure that it is not cleared
// due to all its methods are inlined
static Reference ref;
public static void main(String[] args) throws Exception {
ReferenceQueue queue = new ReferenceQueue();
Object referent = new PhantomReferenceTest();
ref = new PhantomReference(referent, queue);
// drop strong reference
referent = null;
System.gc();
// run finalization to be sure that the reference is enqueued
System.runFinalization();
Reference enqueued;
enqueued = queue.poll();
if (enqueued == null) {
System.out.println("FAIL: reference was not enqueued");
return;
}
if (ref.get() != null) {
System.out.println("FAIL: reference was not cleared.");
return;
}
if (enqueued.get() != null) {
System.out.println("FAIL: reference was not cleared.");
return;
}
System.out.println("PASS");
}
}