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1
5 package org.exoplatform.services.cache;
6
7 import java.io.Serializable  ;
8 import java.util.* ;
9 import java.lang.ref.SoftReference ;
10
17 public class SimpleExoCache extends LinkedHashMap implements ExoCache {
18 private static int DEFAULT_MAX_SIZE = 100 ;
19
20 private String name_ ;
21 private int maxSize_ ;
22 private int cacheHit_ ;
23 private int cacheMiss_ ;
24
25 public SimpleExoCache() {
26 maxSize_ = DEFAULT_MAX_SIZE ;
27 }
28
29 public SimpleExoCache(int maxSize) {
30 maxSize_ = maxSize ;
31 }
32
33 public SimpleExoCache(String name, int maxSize) {
34 maxSize_ = maxSize ;
35 name_ = name ;
36 }
37
38 public String getName() { return name_ ; }
39 public void setName(String s) { name_ = s ; }
40
41 public int getCacheSize() { return size() ; }
42
43 public int getMaxSize() { return maxSize_ ; }
44 public void setMaxSize(int max) { maxSize_ = max ; }
45
46 synchronized public Object get(Serializable name) {
47 SoftReference ref = (SoftReference ) super.get(name) ;
48 if(ref != null) {
49 cacheHit_++ ;
50 return ref.get() ;
51 }
52 cacheMiss_++ ;
53 return null ;
54 }
55
56 synchronized public Object remove(Serializable name) {
57 SoftReference ref = (SoftReference ) super.remove(name) ;
58 if(ref != null) return ref.get() ;
59 return null ;
60 }
61
62 synchronized public void put(Serializable name, Object obj) {
63 SoftReference ref = new SoftReference (obj) ;
64 super.put(name, ref) ;
65 }
66
67 public int getCacheHit() { return cacheHit_ ;}
68
69 public int getCacheMiss() { return cacheMiss_ ; }
70
71 protected boolean removeEldestEntry(Map.Entry eldest) {
72 return size() > maxSize_ ;
73 }
74 } |
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