1 /***
2 * Copyright 2003-2010 Terracotta, Inc.
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.constructs.blocking;
18
19 /***
20 * A cache entry factory that counts the number of entries it has created.
21 * <p/>
22 * This is useful for writing tests.
23 *
24 * @author Greg Luck
25 * @version $Id: CountingCollectionsCacheEntryFactory.html 13146 2011-08-01 17:12:39Z oletizi $
26 */
27 public class CountingCollectionsCacheEntryFactory implements UpdatingCacheEntryFactory {
28
29 private int count;
30 private final Object value;
31
32 /***
33 * Creates a new instance
34 *
35 * @param value the factory always creates values equal to this value
36 */
37 public CountingCollectionsCacheEntryFactory(final Object value) {
38 this.value = value;
39 }
40
41 /***
42 * Fetches an entry.
43 */
44 public Object createEntry(final Object key) {
45 count++;
46 return value;
47 }
48
49 /***
50 * Perform an incremental update of data within a CacheEntry.
51 * Based on identification of dirty values within a CacheEntry
52 * Insert Update or Delete those entries based on the existing value.
53 * <p/>
54 * This method does not return a modified value, because it modifies the value passed into it, relying
55 * on the pass by reference feature of Java.
56 * <p/>
57 * Implementations of this method must be thread safe.
58 *
59 * @param key the cache Key
60 * @param value a value copied from the value that belonged to the Element in the cache. Value must be mutable
61 * @throws Exception
62 */
63 public void updateEntryValue(Object key, Object value) throws Exception {
64 count++;
65
66 }
67
68 /***
69 * @return number of entries the factory has created.
70 */
71 public int getCount() {
72 return count;
73 }
74
75 }