/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
package util;
import java.lang.ref.PhantomReference;
import java.lang.ref.ReferenceQueue;
/**
* Wait until an object has become unreachable.
*
*
Instances of this class will typically be used as either:
*
* SomeType o = new SomeType(...);
* ... // use "o"
* WaitUnreachable u = new WaitUnreachable(o);
* o = null;
* u.waitUnreachable();
*
*
or:
*
* WaitUnreachable u = new WaitUnreachable(new SomeType(...));
* ... // use "(SomeType) u.get()"
* u.waitUnreachable();
*
*/
public final class WaitUnreachable {
/**
* Creates a new waiter.
*
* @param obj the object on which to wait
*/
public WaitUnreachable(Object obj) {
this.obj = obj;
queue = new ReferenceQueue();
ref = new PhantomReference