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1
7 package com.tirsen.nanning.samples;
8
9 import com.tirsen.nanning.Invocation;
10 import com.tirsen.nanning.MethodInterceptor;
11 import com.tirsen.nanning.definition.SingletonInterceptor;
12 import org.apache.commons.logging.Log;
13 import org.apache.commons.logging.LogFactory;
14
15
23 public class TraceInterceptor implements MethodInterceptor, SingletonInterceptor {
24 private Log logger;
25
26 public TraceInterceptor(Log logger) {
27 this.logger = logger;
28 }
29
30 public TraceInterceptor() {
31 }
32
33 public Object  invoke(Invocation invocation) throws Throwable {
34 StopWatch watch = new StopWatch(false);
35
36 Log logger = getLogger(invocation.getTarget().getClass());
37
38 StringBuffer methodCallMessage = new StringBuffer ();
39 methodCallMessage.append(invocation.getMethod().getName());
40 methodCallMessage.append('(');
41 Object [] args = invocation.getArgs();
42 if (args != null) {
43 for (int i = 0; i < args.length; i++) {
44 Object arg = args[i];
45 methodCallMessage.append(arg);
46 if (i + 1 < args.length) {
47 methodCallMessage.append(", ");
48 }
49 }
50 }
51 methodCallMessage.append(')');
52 logger.debug(">>> " + methodCallMessage);
53 Object result = null;
54 try {
55 result = invocation.invokeNext();
56 return result;
57 } catch (Throwable e) {
58 watch.stop();
59 logger.error("<<< " + methodCallMessage + " threw exception, took " + (int) watch.getTimeSpent() + " ms", e);
60 throw e;
61 } finally {
62 watch.stop();
63 logger.debug("<<< " + methodCallMessage + ", took " + (int) watch.getTimeSpent() + " ms, result " + result);
64 }
65 }
66
67 private Log getLogger(Class targetClass) {
68 Log logger;
69 logger = this.logger;
70 if (logger == null) {
71 logger = LogFactory.getLog(targetClass);
72 }
73 return logger;
74 }
75 }
76 |
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