1 /*
2 * Copyright (c) 2001, Zoltan Farkas All Rights Reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18 package net.sf.zel.vm;
19
20 import java.util.HashMap;
21 import java.util.Map;
22 import java.util.WeakHashMap;
23 import javax.annotation.concurrent.NotThreadSafe;
24
25 /**
26 * simple implementation for resultcache.
27 * @author zoly
28 */
29 @NotThreadSafe
30 public class SimpleResultCache implements ResultCache
31 {
32
33 private final Map permanentCache;
34
35 private final Map transientCache;
36
37 public SimpleResultCache()
38 {
39 permanentCache = new HashMap();
40 transientCache = new WeakHashMap();
41 }
42
43
44
45 @Override
46 public void putPermanentResult(Object key, Object result)
47 {
48 permanentCache.put(key, result);
49 }
50
51 @Override
52 public void putTransientResult(Object key, Object result)
53 {
54 transientCache.put(key, result);
55 }
56
57 @Override
58 public Object getResult(Object key)
59 {
60 Object result = permanentCache.get(key);
61 if (result == null)
62 result = transientCache.get(key);
63 return result;
64 }
65
66 }