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1 package org.shiftone.cache.util;
2
3
4
5 import org.shiftone.cache.Cache;
6
7 import java.lang.reflect.InvocationHandler  ;
8 import java.lang.reflect.Method ;
9 import java.lang.reflect.UndeclaredThrowableException ;
10 import java.util.Arrays ;
11
12
13
21 public class CacheInvocationHandler implements InvocationHandler
22 {
23
24 private Cache cache = null;
25 private Object target = null;
26
27 public CacheInvocationHandler(Object target, Cache cache)
28 {
29 this.cache = cache;
30 this.target = target;
31 }
32
33
34 public Object invoke(Object proxy, Method method, Object [] args) throws Throwable
35 {
36
37 Object result = null;
38 Throwable throwable = null;
39 CallKey callKey = null;
40
41 callKey = new CallKey(method.getName(), args);
42
43 try
44 {
45 result = cache.getObject(callKey);
46
47 if (result == null)
48 {
49 result = method.invoke(target, args);
50
51 cache.addObject(callKey, result);
52 }
53 }
54 catch (UndeclaredThrowableException e)
55 {
56 throw e.getUndeclaredThrowable();
57 }
58
59 return result;
60 }
61 }
62
63 class CallKey
64 {
65
66 private final String methodName;
67 private final Object [] args;
68
69 public CallKey(String methodName, Object [] args)
70 {
71 this.methodName = methodName;
72 this.args = args;
73 }
74
75
76 public int hashCode()
77 {
78
79 int code = methodName.hashCode();
80
81 if (args != null)
82 {
83 for (int i = 0; i < args.length; i++)
84 {
85 code = (31 * code) + args[i].hashCode();
86 }
87 }
88
89 return code;
90 }
91
92
93 public boolean equals(Object o)
94 {
95
96 if (this == o)
97 {
98 return true;
99 }
100
101 if (!(o instanceof CallKey))
102 {
103 return false;
104 }
105
106 final CallKey callKey = (CallKey) o;
107
108 if (!methodName.equals(callKey.methodName))
109 {
110 return false;
111 }
112
113 if (!Arrays.equals(args, callKey.args))
114 {
115 return false;
116 }
117
118 return true;
119 }
120 }
121
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