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.store.disk;
18
19 import net.sf.ehcache.pool.SizeOfEngine;
20
21 /***
22 * SizeOf engine which calculates exact usage of the disk store.
23 *
24 * @author Ludovic Orban
25 */
26 public class DiskSizeOfEngine implements SizeOfEngine {
27
28 /***
29 * {@inheritDoc}
30 */
31 public long sizeOf(Object key, Object value, Object container) {
32 if (container != null && !(container instanceof DiskStorageFactory.DiskMarker)) {
33 throw new IllegalArgumentException("can only size DiskStorageFactory.DiskMarker");
34 }
35
36 if (container == null) {
37 return 0;
38 }
39
40 DiskStorageFactory.DiskMarker marker = (DiskStorageFactory.DiskMarker) container;
41 return marker.getSize();
42 }
43
44 }