1 | |
package org.apache.commons.ognl.internal; |
2 | |
|
3 | |
|
4 | |
|
5 | |
|
6 | |
|
7 | |
|
8 | |
|
9 | |
|
10 | |
|
11 | |
|
12 | |
|
13 | |
|
14 | |
|
15 | |
|
16 | |
|
17 | |
|
18 | |
|
19 | |
|
20 | |
|
21 | |
|
22 | |
|
23 | |
|
24 | |
|
25 | |
import org.apache.commons.ognl.internal.entry.CacheEntryFactory; |
26 | |
|
27 | |
import java.util.concurrent.ConcurrentHashMap; |
28 | |
|
29 | |
public class ConcurrentHashMapCache<K, V> |
30 | |
implements Cache<K, V> |
31 | |
{ |
32 | 12 | private ConcurrentHashMap<K, V> cache = new ConcurrentHashMap<K, V>(); |
33 | |
|
34 | |
private CacheEntryFactory<K, V> cacheEntryFactory; |
35 | |
|
36 | |
public ConcurrentHashMapCache() |
37 | 0 | { |
38 | 0 | } |
39 | |
|
40 | |
public ConcurrentHashMapCache( CacheEntryFactory<K, V> cacheEntryFactory ) |
41 | 12 | { |
42 | 12 | this.cacheEntryFactory = cacheEntryFactory; |
43 | 12 | } |
44 | |
|
45 | |
public void clear() |
46 | |
{ |
47 | 0 | cache.clear(); |
48 | 0 | } |
49 | |
|
50 | |
public int getSize() |
51 | |
{ |
52 | 0 | return cache.size(); |
53 | |
} |
54 | |
|
55 | |
public V get( K key ) |
56 | |
throws CacheException |
57 | |
{ |
58 | 15 | V v = cache.get( key ); |
59 | 15 | if ( shouldCreate( cacheEntryFactory, v ) ) |
60 | |
{ |
61 | 14 | return put( key, cacheEntryFactory.create( key ) ); |
62 | |
} |
63 | 1 | return v; |
64 | |
} |
65 | |
|
66 | |
protected boolean shouldCreate( CacheEntryFactory<K, V> cacheEntryFactory, V v ) |
67 | |
throws CacheException |
68 | |
{ |
69 | 15 | if ( cacheEntryFactory != null ) |
70 | |
{ |
71 | 15 | if ( v == null ) |
72 | |
{ |
73 | 14 | return true; |
74 | |
} |
75 | |
} |
76 | 1 | return false; |
77 | |
} |
78 | |
|
79 | |
public V put( K key, V value ) |
80 | |
{ |
81 | 14 | V collision = cache.putIfAbsent( key, value ); |
82 | 14 | if ( collision != null ) |
83 | |
{ |
84 | 0 | return collision; |
85 | |
} |
86 | 14 | return value; |
87 | |
} |
88 | |
|
89 | |
public boolean contains( K key ) |
90 | |
{ |
91 | 0 | return this.cache.contains( key ); |
92 | |
} |
93 | |
} |