1 /**
2 * Copyright 2003-2007 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.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.java 512 2007-07-10 09:18:45Z gregluck $
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 * @param value the factory always creates values equal to this value
35 */
36 public CountingCollectionsCacheEntryFactory(final Object value) {
37 this.value = value;
38 }
39
40 /**
41 * Fetches an entry.
42 */
43 public Object createEntry(final Object key) {
44 count++;
45 return value;
46 }
47
48 /**
49 * Perform an incremental update of data within a CacheEntry.
50 * Based on identification of dirty values within a CacheEntry
51 * Insert Update or Delete those entries based on the existing value.
52 * <p/>
53 * This method does not return a modified value, because it modifies the value passed into it, relying
54 * on the pass by reference feature of Java.
55 * <p/>
56 * Implementations of this method must be thread safe.
57 *
58 * @param key the cache Key
59 * @param value a value copied from the value that belonged to the Element in the cache. Value must be mutable
60 * @throws Exception
61 */
62 public void updateEntryValue(Object key, Object value) throws Exception {
63 count++;
64 //nothing required for this example.
65 }
66
67 /**
68 * @return number of entries the factory has created.
69 */
70 public int getCount() {
71 return count;
72 }
73
74 }