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34 package info.magnolia.cms.beans.config;
35
36 import info.magnolia.cms.core.Content;
37 import info.magnolia.cms.core.HierarchyManager;
38 import info.magnolia.cms.util.ObservationUtil;
39 import info.magnolia.cms.util.SystemContentWrapper;
40 import info.magnolia.context.MgnlContext;
41
42 import java.util.ArrayList;
43 import java.util.HashSet;
44 import java.util.Iterator;
45 import java.util.List;
46 import java.util.Set;
47
48 import javax.jcr.observation.EventIterator;
49 import javax.jcr.observation.EventListener;
50
51 import org.slf4j.Logger;
52 import org.slf4j.LoggerFactory;
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60 public abstract class ObservedManager {
61 protected final Logger log = LoggerFactory.getLogger(getClass());
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66 protected Set<String> registeredUUIDs = new HashSet<String>();
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72 public synchronized void register(Content node) {
73 if (node == null) {
74 log.warn("Tried to register a non-existing node!");
75 return;
76 }
77
78 ObservationUtil.registerDeferredChangeListener(ContentRepository.CONFIG, node.getHandle(), new EventListener() {
79
80 public void onEvent(EventIterator events) {
81 reload();
82 }
83 }, 1000, 5000);
84
85 try {
86 registeredUUIDs.add(node.getUUID());
87 onRegister(new SystemContentWrapper(node));
88 }
89 catch (Exception e) {
90 log.warn("Was not able to register [" + node.getHandle() + "]", e);
91 }
92 }
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97 public synchronized void reload() {
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99 onClear();
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101 HierarchyManager hm = MgnlContext.getSystemContext().getHierarchyManager(ContentRepository.CONFIG);
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104 List<String> uuids = new ArrayList<String>(registeredUUIDs);
105
106 for (Iterator<String> iter = uuids.iterator(); iter.hasNext();) {
107 String uuid = iter.next();
108 try {
109 Content node = hm.getContentByUUID(uuid);
110 reload(node);
111 }
112 catch (Exception e) {
113 registeredUUIDs.remove(uuid);
114 log.warn("Can't reload the the node [" + uuid + "]");
115 }
116 }
117 return;
118 }
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124 protected void reload(Content node) {
125 onRegister(node);
126 }
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131 public void clear() {
132 this.registeredUUIDs.clear();
133 onClear();
134 }
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140 protected abstract void onRegister(Content node);
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145 protected abstract void onClear();
146
147 }