1 /**
2 * This file Copyright (c) 2019 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.observation;
35
36 import info.magnolia.ui.api.ioc.SubAppScoped;
37
38 import java.util.ArrayList;
39 import java.util.Collection;
40
41 import javax.inject.Inject;
42
43 import com.vaadin.shared.Registration;
44 import com.vaadin.ui.UI;
45
46 /**
47 * Performs UI actions registered by @{link {@link #register(Runnable)}} when calling {@link #trigger()}.
48 */
49 @SubAppScoped
50 public class LocalManualDatasourceObservation implements DatasourceObservation.Manual {
51
52 private final UI ui;
53 private final Collection<Runnable> actions = new ArrayList<>();
54
55 @Inject
56 public LocalManualDatasourceObservation(UI ui) {
57 this.ui = ui;
58 }
59
60 @Override
61 public Registration register(Runnable action) {
62 actions.add(action);
63 return () -> actions.remove(action);
64 }
65
66 @Override
67 public void trigger() {
68 if (!ui.isAttached()) {
69 return;
70 }
71 actions.forEach(observationAction -> ui.access(() -> {
72 observationAction.run();
73 ui.push();
74 }));
75 }
76 }