1 /**
2 * Copyright 2003-2006 Greg Luck
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package net.sf.ehcache.event;
18
19 import java.util.ArrayList;
20 import java.util.List;
21
22
23 /**
24 * A counting cache manager listener.
25 * @author Greg Luck
26 * @version $Id: CountingCacheManagerEventListener.java 28 2006-04-15 05:12:32Z gregluck $
27 */
28 public class CountingCacheManagerEventListener implements CacheManagerEventListener {
29
30
31 private static List cacheNamesAdded = new ArrayList();
32 private static List cacheNamesRemoved = new ArrayList();
33
34 /**
35 * Accessor
36 */
37 public static List getCacheNamesAdded() {
38 return cacheNamesAdded;
39 }
40
41 /**
42 * Resets the counters to 0
43 */
44 public static void resetCounters() {
45 cacheNamesAdded.clear();
46 cacheNamesRemoved.clear();
47 }
48
49 /**
50 * Accessor
51 */
52 public static List getCacheNamesRemoved() {
53 return cacheNamesRemoved;
54 }
55
56 /**
57 * Called immediately after a cache has been added and activated.
58 * <p/>
59 * Note that the CacheManager calls this method from a synchronized method. Any attempt to call a synchronized
60 * method on CacheManager from this method will cause a deadlock.
61 * <p/>
62 * Note that activation will also cause a CacheEventListener status change notification from
63 * {@link net.sf.ehcache.Status#STATUS_UNINITIALISED} to {@link net.sf.ehcache.Status#STATUS_ALIVE}. Care should be
64 * taken on processing that notification because:
65 * <ul>
66 * <li>the cache will not yet be accessible from the CacheManager.
67 * <li>the addCaches methods whih cause this notification are synchronized on the CacheManager. An attempt to call
68 * {@link net.sf.ehcache.CacheManager#getCache(String)} will cause a deadlock.
69 * </ul>
70 * The calling method will block until this method returns.
71 * <p/>
72 *
73 * @param cacheName the name of the <code>Cache</code> the operation relates to
74 * @see net.sf.ehcache.event.CacheEventListener
75 */
76 public void notifyCacheAdded(String cacheName) {
77 cacheNamesAdded.add(cacheName);
78 }
79
80 /**
81 * Called immediately after a cache has been disposed and removed. The calling method will block until
82 * this method returns.
83 * <p/>
84 * Note that the CacheManager calls this method from a synchronized method. Any attempt to call a synchronized
85 * method on CacheManager from this method will cause a deadlock.
86 * <p/>
87 * Note that a {@link net.sf.ehcache.event.CacheEventListener} status changed will also be triggered. Any attempt from that notification
88 * to access CacheManager will also result in a deadlock.
89 *
90 * @param cacheName the name of the <code>Cache</code> the operation relates to
91 */
92 public void notifyCacheRemoved(String cacheName) {
93 cacheNamesRemoved.add(cacheName);
94 }
95 }