1 /**
2 * This file Copyright (c) 2011-2018 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.jcr.wrapper;
35
36 import info.magnolia.context.MgnlContext;
37
38 import java.util.Optional;
39
40 import javax.jcr.Node;
41 import javax.jcr.RepositoryException;
42 import javax.jcr.Session;
43
44 import com.machinezoo.noexception.Exceptions;
45
46
47 /**
48 * Node wrapper that will reacquire the node if its session is closed.
49 */
50 public class LazyNodeWrapper extends DelegateNodeWrapper {
51
52 private String workspace;
53 private String nodeIdentifier;
54 private transient Node node;
55
56 public static Node of(Node node) {
57 return Optional.ofNullable(node)
58 .map(Exceptions.wrap().function(LazyNodeWrapper::new))
59 .orElse(null);
60 }
61
62 public LazyNodeWrapper(String workspace, String nodeIdentifier) {
63 this.workspace = workspace;
64 this.nodeIdentifier = nodeIdentifier;
65 }
66
67 public LazyNodeWrapper(Node node) throws RepositoryException {
68 this.workspace = node.getSession().getWorkspace().getName();
69 this.nodeIdentifier = node.getIdentifier();
70 this.node = node;
71 }
72
73 @Override
74 public synchronized Node getWrappedNode() {
75 return Optional.ofNullable(node)
76 .filter(Exceptions.wrap().predicate(node -> node.getSession().isLive()))
77 .orElseGet(Exceptions.wrap().supplier(
78 () -> {
79 Session session = getSessionForWrappedNode(workspace);
80 return session.getNodeByIdentifier(nodeIdentifier);
81 })
82 );
83 }
84
85 @Override
86 public void setWrappedNode(Node node) {
87 Exceptions.wrap().run(() -> {
88 workspace = node.getSession().getWorkspace().getName();
89 nodeIdentifier = node.getIdentifier();
90 LazyNodeWrapper.this.node = node;
91 });
92 }
93
94 protected Session getSessionForWrappedNode(String workspace) throws RepositoryException {
95 try {
96 return MgnlContext.getJCRSession(workspace);
97 } catch (Exception e) {
98 return MgnlContext.getSystemContext().getJCRSession(workspace);
99 }
100 }
101 }