1
|
/**
|
2
|
* Copyright (C) 2007 EDIT
|
3
|
* European Distributed Institute of Taxonomy
|
4
|
* http://www.e-taxonomy.eu
|
5
|
*
|
6
|
* The contents of this file are subject to the Mozilla Public License Version 1.1
|
7
|
* See LICENSE.TXT at the top of this package for the full license terms.
|
8
|
*/
|
9
|
|
10
|
package eu.etaxonomy.cdm.persistence.hibernate;
|
11
|
|
12
|
import java.util.HashSet;
|
13
|
import java.util.Set;
|
14
|
|
15
|
import org.apache.log4j.Logger;
|
16
|
import org.hibernate.event.spi.PostDeleteEvent;
|
17
|
import org.hibernate.event.spi.PostDeleteEventListener;
|
18
|
import org.hibernate.event.spi.PostInsertEvent;
|
19
|
import org.hibernate.event.spi.PostInsertEventListener;
|
20
|
import org.hibernate.event.spi.PostLoadEvent;
|
21
|
import org.hibernate.event.spi.PostLoadEventListener;
|
22
|
import org.hibernate.event.spi.PostUpdateEvent;
|
23
|
import org.hibernate.event.spi.PostUpdateEventListener;
|
24
|
import org.hibernate.persister.entity.EntityPersister;
|
25
|
|
26
|
import eu.etaxonomy.cdm.model.common.CdmBase;
|
27
|
|
28
|
/**
|
29
|
* ICdmPostDataChangeObserver implementors may register for this listener and their update() will
|
30
|
* be called after any CRUD (Create, Retrieve, Update, Delete).
|
31
|
*
|
32
|
* Only events whose entities are of type CdmBase will be propagated
|
33
|
*
|
34
|
* TODO Manage this class via Spring
|
35
|
*
|
36
|
* @author n.hoffmann
|
37
|
* @since 24.03.2009
|
38
|
*/
|
39
|
public class CdmPostDataChangeObservableListener implements
|
40
|
PostDeleteEventListener
|
41
|
, PostInsertEventListener
|
42
|
, PostLoadEventListener
|
43
|
, PostUpdateEventListener
|
44
|
{
|
45
|
private static final long serialVersionUID = -8764348096490526927L;
|
46
|
@SuppressWarnings("unused")
|
47
|
private static final Logger logger = Logger.getLogger(CdmPostDataChangeObservableListener.class);
|
48
|
|
49
|
/**
|
50
|
* if this is set to true, observers have to be notified manually by calling
|
51
|
* {@link #delayedNotify()}. All events until then will be stored in {@link #changeEvents}
|
52
|
*/
|
53
|
private boolean delayed;
|
54
|
|
55
|
/**
|
56
|
* Define what events will be propagated
|
57
|
*/
|
58
|
private boolean propagateLoads = false,
|
59
|
propagateInserts = true,
|
60
|
propagateUpdates = true,
|
61
|
propagateDeletes = true;
|
62
|
|
63
|
/**
|
64
|
* DataChangeEvents get stored in this list for delayed propagation
|
65
|
*/
|
66
|
private CdmDataChangeMap changeEvents;
|
67
|
|
68
|
/**
|
69
|
* Observing objects
|
70
|
*/
|
71
|
private final Set<ICdmPostDataChangeObserver> observers = new HashSet<>();
|
72
|
|
73
|
|
74
|
/**
|
75
|
* Singleton instance
|
76
|
*/
|
77
|
private static CdmPostDataChangeObservableListener instance;
|
78
|
|
79
|
/**
|
80
|
* @return the singleton CdmPostDataChangeObservableListener
|
81
|
*/
|
82
|
public static CdmPostDataChangeObservableListener getDefault(){
|
83
|
if(instance == null){
|
84
|
instance = new CdmPostDataChangeObservableListener();
|
85
|
// TODO set these properties via Spring
|
86
|
// get the delayed version by default
|
87
|
instance.setDelayed(true);
|
88
|
// omit load events from propagation
|
89
|
instance.setPropagateLoads(false);
|
90
|
}
|
91
|
return instance;
|
92
|
}
|
93
|
|
94
|
/**
|
95
|
* Register for updates
|
96
|
*
|
97
|
* @param observer
|
98
|
*/
|
99
|
public void register(ICdmPostDataChangeObserver observer){
|
100
|
getDefault().observers.add(observer);
|
101
|
}
|
102
|
|
103
|
/**
|
104
|
* Remove observer from notify queue
|
105
|
* @param observer
|
106
|
*/
|
107
|
public void unregister(ICdmPostDataChangeObserver observer){
|
108
|
getDefault().observers.remove(observer);
|
109
|
}
|
110
|
|
111
|
public void delayedNotify(){
|
112
|
if(delayed && changeEvents.size() > 0){
|
113
|
Set<ICdmPostDataChangeObserver> modificationSaveObservers
|
114
|
= new HashSet<>(observers);
|
115
|
for( ICdmPostDataChangeObserver observer : modificationSaveObservers){
|
116
|
observer.update(changeEvents);
|
117
|
}
|
118
|
changeEvents.clear();
|
119
|
}
|
120
|
}
|
121
|
|
122
|
/**
|
123
|
* Propagates the event to all registered objects.
|
124
|
*
|
125
|
* @param event
|
126
|
*/
|
127
|
public void notifyObservers(CdmDataChangeEvent event){
|
128
|
for( ICdmPostDataChangeObserver observer : observers){
|
129
|
if(delayed){
|
130
|
// store event for delayed propagation
|
131
|
changeEvents.add(event.getEventType(), event);
|
132
|
}else{
|
133
|
// propagate event directly
|
134
|
CdmDataChangeMap tmpMap = new CdmDataChangeMap();
|
135
|
tmpMap.add(event.getEventType(), event);
|
136
|
observer.update(tmpMap);
|
137
|
}
|
138
|
}
|
139
|
}
|
140
|
|
141
|
public void fireNotification(CdmDataChangeEvent event) {
|
142
|
for( ICdmPostDataChangeObserver observer : observers){
|
143
|
// propagate event directly
|
144
|
CdmDataChangeMap tmpMap = new CdmDataChangeMap();
|
145
|
tmpMap.add(event.getEventType(), event);
|
146
|
observer.update(tmpMap);
|
147
|
|
148
|
}
|
149
|
}
|
150
|
|
151
|
@Override
|
152
|
public void onPostInsert(PostInsertEvent event) {
|
153
|
if(propagateInserts && event.getEntity() instanceof CdmBase){
|
154
|
getDefault().notifyObservers(CdmDataChangeEvent.NewInstance(event));
|
155
|
}
|
156
|
}
|
157
|
|
158
|
@Override
|
159
|
public void onPostLoad(PostLoadEvent event) {
|
160
|
if(propagateLoads && event.getEntity() instanceof CdmBase){
|
161
|
getDefault().notifyObservers(CdmDataChangeEvent.NewInstance(event));
|
162
|
}
|
163
|
}
|
164
|
|
165
|
@Override
|
166
|
public void onPostUpdate(PostUpdateEvent event) {
|
167
|
if(propagateUpdates && event.getEntity() instanceof CdmBase){
|
168
|
getDefault().notifyObservers(CdmDataChangeEvent.NewInstance(event));
|
169
|
}
|
170
|
}
|
171
|
|
172
|
@Override
|
173
|
public void onPostDelete(PostDeleteEvent event) {
|
174
|
if(propagateDeletes && event.getEntity() instanceof CdmBase){
|
175
|
getDefault().notifyObservers(CdmDataChangeEvent.NewInstance(event));
|
176
|
}
|
177
|
}
|
178
|
|
179
|
/**
|
180
|
* @return the delayed
|
181
|
*/
|
182
|
public boolean isDelayed() {
|
183
|
return delayed;
|
184
|
}
|
185
|
|
186
|
/**
|
187
|
* @param delayed the delayed to set
|
188
|
*/
|
189
|
public void setDelayed(boolean delayed) {
|
190
|
if(delayed && changeEvents == null){
|
191
|
changeEvents = new CdmDataChangeMap();
|
192
|
}
|
193
|
this.delayed = delayed;
|
194
|
}
|
195
|
|
196
|
/**
|
197
|
* @return the propagateLoads
|
198
|
*/
|
199
|
public boolean isPropagateLoads() {
|
200
|
return propagateLoads;
|
201
|
}
|
202
|
|
203
|
/**
|
204
|
* @param propagateLoads the propagateLoads to set
|
205
|
*/
|
206
|
public void setPropagateLoads(boolean propagateLoads) {
|
207
|
this.propagateLoads = propagateLoads;
|
208
|
}
|
209
|
|
210
|
/**
|
211
|
* @return the propagateInserts
|
212
|
*/
|
213
|
public boolean isPropagateInserts() {
|
214
|
return propagateInserts;
|
215
|
}
|
216
|
|
217
|
/**
|
218
|
* @param propagateInserts the propagateInserts to set
|
219
|
*/
|
220
|
public void setPropagateInserts(boolean propagateInserts) {
|
221
|
this.propagateInserts = propagateInserts;
|
222
|
}
|
223
|
|
224
|
/**
|
225
|
* @return the propagateUpdates
|
226
|
*/
|
227
|
public boolean isPropagateUpdates() {
|
228
|
return propagateUpdates;
|
229
|
}
|
230
|
|
231
|
/**
|
232
|
* @param propagateUpdates the propagateUpdates to set
|
233
|
*/
|
234
|
public void setPropagateUpdates(boolean propagateUpdates) {
|
235
|
this.propagateUpdates = propagateUpdates;
|
236
|
}
|
237
|
|
238
|
/**
|
239
|
* @return the propagateDeletes
|
240
|
*/
|
241
|
public boolean isPropagateDeletes() {
|
242
|
return propagateDeletes;
|
243
|
}
|
244
|
|
245
|
/**
|
246
|
* @param propagateDeletes the propagateDeletes to set
|
247
|
*/
|
248
|
public void setPropagateDeletes(boolean propagateDeletes) {
|
249
|
this.propagateDeletes = propagateDeletes;
|
250
|
}
|
251
|
|
252
|
@Override
|
253
|
public boolean requiresPostCommitHanding(EntityPersister persister) {
|
254
|
return false;
|
255
|
}
|
256
|
|
257
|
}
|