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1 package org.apache.el.util;
2
3 import java.util.Map  ;
4 import java.util.WeakHashMap ;
5 import java.util.concurrent.ConcurrentHashMap ;
6
7 public final class ConcurrentCache<K,V> {
8
9 private final int size;
10
11 private final Map <K,V> eden;
12
13 private final Map <K,V> longterm;
14
15 public ConcurrentCache(int size) {
16 this.size = size;
17 this.eden = new ConcurrentHashMap <K,V>(size);
18 this.longterm = new WeakHashMap <K,V>(size);
19 }
20
21 public V get(K k) {
22 V v = this.eden.get(k);
23 if (v == null) {
24 v = this.longterm.get(k);
25 if (v != null) {
26 this.eden.put(k, v);
27 }
28 }
29 return v;
30 }
31
32 public void put(K k, V v) {
33 if (this.eden.size() >= size) {
34 this.longterm.putAll(this.eden);
35 this.eden.clear();
36 }
37 this.eden.put(k, v);
38 }
39 }
40 |
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