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1
8 package org.apache.avalon.excalibur.cache;
9
10
15 public class DefaultCache
16 extends AbstractCache
17 {
18 private ReplacementPolicy m_policy;
19 private CacheStore m_store;
20
21 public DefaultCache( final ReplacementPolicy policy,
22 final CacheStore store )
23 {
24 m_policy = policy;
25 m_store = store;
26 }
27
28 public int capacity()
29 {
30 return m_store.capacity();
31 }
32
33 public int size()
34 {
35 return m_store.size();
36 }
37
38 public Object  put( final Object key, final Object value )
39 {
40 final Object oldValue = remove( key );
41
42 if ( m_store.isFull() )
43 {
44 remove( m_policy.selectVictim() );
45 }
46
47 m_store.put( key, value );
48 m_policy.add( key );
49 notifyAdded( key, value );
50
51 return oldValue;
52 }
53
54 public Object get( final Object key )
55 {
56 final Object value = m_store.get( key );
57 m_policy.hit( key );
58
59 return value;
60 }
61
62 public Object remove( final Object key )
63 {
64 Object value = null;
65
66 if ( m_store.containsKey( key ) )
67 {
68 value = m_store.remove( key );
69 m_policy.remove( key );
70 notifyRemoved( key, value );
71 }
72
73 return value;
74 }
75
76 public boolean containsKey( final Object key )
77 {
78 return m_store.containsKey( key );
79 }
80
81 public void clear()
82 {
83 final Object [] keys = m_store.keys();
84 for ( int i = 0; i < keys.length; i++ )
85 {
86 remove( keys[ i ] );
87 }
88 }
89 }
90 |
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