1 /**
2 * This file Copyright (c) 2018 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.ui.framework;
35
36 import info.magnolia.ui.framework.ioc.Destructible;
37
38 import java.util.HashSet;
39 import java.util.Optional;
40 import java.util.Set;
41 import java.util.function.Consumer;
42
43 import io.reactivex.disposables.Disposable;
44
45 /**
46 * {@link ContextProperty} wrapper which tracks the subscribers
47 * and is able to clean them up upon {@link #destroy()} method call.
48 *
49 * @param <T> item type.
50 */
51 public class LeakagePreventingWrapper<T> extends ContextProperty.Wrapper<T> implements Destructible {
52
53 private Set<Disposable> subscribers = new HashSet<>();
54
55 public LeakagePreventingWrapper(ContextProperty<T> delegate) {
56 super(delegate);
57 }
58
59 @Override
60 public Disposable observeNullable(Consumer<T> action) {
61 final Disposable subscriber = super.observeNullable(action);
62
63 subscribers.add(subscriber);
64
65 return subscriber;
66 }
67
68 @Override
69 public Disposable observe(Consumer<Optional<T>> action) {
70 final Disposable subscriber = super.observe(action);
71
72 subscribers.add(subscriber);
73
74 return subscriber;
75 }
76
77 @Override
78 public void destroy() {
79 this.subscribers.forEach(Disposable::dispose);
80 }
81 }