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1 package com.tirsen.nanning.samples;
2
3 import com.tirsen.nanning.AspectInstance;
4 import com.tirsen.nanning.Invocation;
5 import com.tirsen.nanning.MethodInterceptor;
6 import com.tirsen.nanning.MixinInstance;
7 import com.tirsen.nanning.config.Aspect;
8 import com.tirsen.nanning.config.AttributePointcut;
9 import com.tirsen.nanning.config.Pointcut;
10
11 import java.lang.reflect.Method  ;
12 import java.util.Iterator ;
13 import java.util.List ;
14
15 public class CacheAspect implements Aspect {
16 int totalCount;
17 int missCount;
18 private MethodInterceptor cacheInterceptor;
19 private Pointcut pointcut = new AttributePointcut("cache");
20
21 public CacheAspect(MethodInterceptor cacheInterceptor) {
22 this.cacheInterceptor = cacheInterceptor;
23 }
24
25 public CacheAspect() {
26 this(new CacheInterceptor());
27 }
28
29 public void introduce(AspectInstance aspectInstance) {
30 }
31
32 public void advise(AspectInstance instance) {
33 List mixins = instance.getMixins();
34 for (Iterator iterator = mixins.iterator(); iterator.hasNext();) {
35 MixinInstance mixin = (MixinInstance) iterator.next();
36 Method [] methods = pointcut.methodsToAdvise(instance, mixin);
37 for (int i = 0; i < methods.length; i++) {
38 Method method = methods[i];
39 mixin.addInterceptor(method, new MethodInterceptor() {
40 public Object invoke(Invocation invocation) throws Throwable {
41 totalCount++;
42 return invocation.invokeNext();
43 }
44 });
45 mixin.addInterceptor(method, cacheInterceptor);
46 mixin.addInterceptor(method, new MethodInterceptor() {
47 public Object invoke(Invocation invocation) throws Throwable {
48 missCount++;
49 return invocation.invokeNext();
50 }
51 });
52 }
53 }
54 }
55
56 public double getCacheHitRatio() {
57 return totalCount == 0 ? 1 : (totalCount - missCount) / (double) totalCount;
58 }
59 }
60 |
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