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1 package com.tirsen.nanning.samples;
2
3 import java.lang.reflect.Method  ;
4 import java.util.Arrays ;
5 import java.util.HashMap ;
6 import java.util.List ;
7 import java.util.Map ;
8
9 import com.tirsen.nanning.*;
10 import com.tirsen.nanning.attribute.Attributes;
11 import org.apache.commons.logging.Log;
12 import org.apache.commons.logging.LogFactory;
13
14 public class CacheInterceptor implements MethodInterceptor, FilterMethodsInterceptor {
15 private static final Log logger = LogFactory.getLog(CacheInterceptor.class);
16
17
20 private Map cache = new HashMap ();
21
22 public boolean interceptsMethod(Method method) {
23 return Attributes.hasAttribute(method, "cache");
24 }
25
26 public Object invoke(Invocation invocation) throws Throwable {
27 Method method = invocation.getMethod();
28 Map methodCache = getMethodCache(method);
29 List args = Arrays.asList(invocation.getArgs()); Object cachedResult = methodCache.get(args);
31 if (cachedResult == null) {
32 if (logger.isDebugEnabled()) {
33 logger.debug("caching call for method " + method + " with args " + args);
34 }
35 cachedResult = invocation.invokeNext();
36 methodCache.put(args, cachedResult);
37 }
38 return cachedResult;
39 }
40
41 private Map getMethodCache(Method method) {
42 Map methodCache = (Map ) cache.get(method);
43 if (methodCache == null) {
44 methodCache = new HashMap ();
45 cache.put(method, methodCache);
46 }
47 return methodCache;
48 }
49
50 public void clearCache() {
51 cache.clear();
52 }
53 }
54 |
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