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1 package org.shiftone.cache.util;
2
3
4
5 import org.shiftone.cache.Cache;
6 import org.shiftone.cache.CacheException;
7 import org.shiftone.cache.CacheFactory;
8 import org.shiftone.cache.policy.zero.ZeroCacheFactory;
9
10
11
15 public abstract class AbstractDecoratorCacheFactory implements CacheFactory
16 {
17
18 private static final Log LOG = new Log(AbstractDecoratorCacheFactory.class);
19 private CacheFactory delegate;
20
21 public Cache newInstance(String  cacheName, long timeoutMs, int maxSize)
22 {
23
24 CacheFactory factory = getDelegate();
25 Cache cache = null;
26
27 try
28 {
29 cache = factory.newInstance(cacheName, timeoutMs, maxSize);
30
31 if (factory != null)
32 {
33 cache = wrapDelegate(cacheName, cache);
34 }
35 }
36 catch (Exception e)
37 {
38 LOG.error("unable to create cache decorator : " + cacheName, e);
39 }
40
41 if (cache == null)
42 {
43 LOG.info("returning null cache for : " + cacheName);
44
45 cache = ZeroCacheFactory.NULL_CACHE;
46 }
47
48 return cache;
49 }
50
51
52 protected abstract Cache wrapDelegate(String cacheName, Cache delegateCache) throws CacheException;
53
54
55 public CacheFactory getDelegate()
56 {
57 return delegate;
58 }
59
60
61 public void setDelegate(CacheFactory delegate)
62 {
63 this.delegate = delegate;
64 }
65
66
67 public String toString()
68 {
69 return getClass().getName() + "[" + delegate + "]";
70 }
71 }
72 |
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