1 package org.apache.commons.jcs.engine;
2
3 import java.io.IOException;
4 import java.util.Map;
5 import java.util.Set;
6 import java.util.concurrent.ConcurrentHashMap;
7 import java.util.concurrent.ConcurrentMap;
8 import java.util.concurrent.CopyOnWriteArraySet;
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29 import org.apache.commons.jcs.engine.behavior.ICacheListener;
30 import org.apache.commons.jcs.engine.behavior.ICacheObserver;
31 import org.apache.commons.logging.Log;
32 import org.apache.commons.logging.LogFactory;
33
34
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38
39 public class CacheWatchRepairable
40 implements ICacheObserver
41 {
42
43 private static final Log log = LogFactory.getLog( CacheWatchRepairable.class );
44
45
46 private ICacheObserver cacheWatch;
47
48
49 private final ConcurrentMap<String, Set<ICacheListener<?, ?>>> cacheMap =
50 new ConcurrentHashMap<String, Set<ICacheListener<?, ?>>>();
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52
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57
58 public void setCacheWatch( ICacheObserver cacheWatch )
59 {
60 this.cacheWatch = cacheWatch;
61 for (Map.Entry<String, Set<ICacheListener<?, ?>>> entry : cacheMap.entrySet())
62 {
63 String cacheName = entry.getKey();
64 for (ICacheListener<?, ?> listener : entry.getValue())
65 {
66 try
67 {
68 if ( log.isInfoEnabled() )
69 {
70 log.info( "Adding listener to cache watch. ICacheListener = " + listener
71 + " | ICacheObserver = " + cacheWatch );
72 }
73 cacheWatch.addCacheListener( cacheName, listener );
74 }
75 catch ( IOException ex )
76 {
77 log.error( "Problem adding listener. ICacheListener = " + listener + " | ICacheObserver = "
78 + cacheWatch, ex );
79 }
80 }
81 }
82 }
83
84
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89
90
91 @Override
92 public <K, V> void addCacheListener( String cacheName, ICacheListener<K, V> obj )
93 throws IOException
94 {
95
96
97 Set<ICacheListener<?, ?>> listenerSet = cacheMap.get( cacheName );
98 if ( listenerSet == null )
99 {
100 Set<ICacheListener<?, ?>> newListenerSet = new CopyOnWriteArraySet<ICacheListener<?, ?>>();
101 listenerSet = cacheMap.putIfAbsent( cacheName, newListenerSet );
102
103 if (listenerSet == null)
104 {
105 listenerSet = newListenerSet;
106 }
107 }
108
109 listenerSet.add( obj );
110
111 if ( log.isInfoEnabled() )
112 {
113 log.info( "Adding listener to cache watch. ICacheListener = " + obj
114 + " | ICacheObserver = " + cacheWatch + " | cacheName = " + cacheName );
115 }
116 cacheWatch.addCacheListener( cacheName, obj );
117 }
118
119
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123
124
125 @Override
126 public <K, V> void addCacheListener( ICacheListener<K, V> obj )
127 throws IOException
128 {
129
130
131 for (Set<ICacheListener<?, ?>> listenerSet : cacheMap.values())
132 {
133 listenerSet.add( obj );
134 }
135
136 if ( log.isInfoEnabled() )
137 {
138 log.info( "Adding listener to cache watch. ICacheListener = " + obj
139 + " | ICacheObserver = " + cacheWatch );
140 }
141 cacheWatch.addCacheListener( obj );
142 }
143
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150
151 @Override
152 public <K, V> void removeCacheListener( String cacheName, ICacheListener<K, V> obj )
153 throws IOException
154 {
155 if ( log.isInfoEnabled() )
156 {
157 log.info( "removeCacheListener, cacheName [" + cacheName + "]" );
158 }
159
160
161 Set<ICacheListener<?, ?>> listenerSet = cacheMap.get( cacheName );
162 if ( listenerSet != null )
163 {
164 listenerSet.remove( obj );
165 }
166 cacheWatch.removeCacheListener( cacheName, obj );
167 }
168
169
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171
172
173 @Override
174 public <K, V> void removeCacheListener( ICacheListener<K, V> obj )
175 throws IOException
176 {
177 if ( log.isInfoEnabled() )
178 {
179 log.info( "removeCacheListener, ICacheListener [" + obj + "]" );
180 }
181
182
183
184 for (Set<ICacheListener<?, ?>> listenerSet : cacheMap.values())
185 {
186 if ( log.isDebugEnabled() )
187 {
188 log.debug( "Before removing [" + obj + "] the listenerSet = " + listenerSet );
189 }
190 listenerSet.remove( obj );
191 }
192 cacheWatch.removeCacheListener( obj );
193 }
194 }