1 package per.zww.util;
 2 
 3 import java.util.Map;
 4 import java.util.concurrent.ConcurrentHashMap;
 5 
 6 public class CachePool {
 7     private static CachePool cachePool;
 8     private Map<Object, Object> cacheItems;
 9     private CachePool() {
10         cacheItems =new ConcurrentHashMap<Object, Object>();
11     }
12     /**
13      * 获取唯一实例
14      * @return instance
15      */
16     public static CachePool getInstance() {
17         if (cachePool ==null) {
18             synchronized (CachePool.class) {
19                 if (cachePool ==null) {
20                     cachePool =new CachePool();
21                 }
22             }
23         }
24         return cachePool;
25     }
26     
27     /**
28      * 获取所有cache信息
29      * @return cacheItems
30      */
31     public Map<Object, Object> getCacheItems() {
32         return this.cacheItems;
33     }
34     
35     /**
36      * 清空cache
37      */
38     public void clearAllItems() {
39         cacheItems.clear();
40     }
41     
42     /**
43      * 获取指定cache信息
44      * @return cacheItem
45      */
46     public Object getCacheItem(Object key) {
47         if (cacheItems.containsKey(key)) {
48             return cacheItems.get(key);
49         }
50         return null;
51     }
52     
53     /**
54      * 存放cache信息
55      */
56     public void putCacheItem(Object key,Object value) {
57         if (!cacheItems.containsKey(key)) {
58             cacheItems.put(key, value);
59         }
60     }
61     
62     /**
63      * 删除一个cache
64      */
65     public void removeCacheItem(Object key) {
66         if (cacheItems.containsKey(key)) {
67             cacheItems.remove(key);
68         }
69     }
70     
71     /**
72      * 获取cache长度
73      * @return size
74      */
75     public int getSize() {
76         return cacheItems.size();
77     }
78     
79 }