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1
17 package org.apache.servicemix.sca.tuscany;
18
19 import java.lang.ref.WeakReference  ;
20 import java.lang.reflect.InvocationHandler ;
21 import java.lang.reflect.Method ;
22 import java.lang.reflect.Proxy ;
23 import java.util.Map ;
24 import java.util.WeakHashMap ;
25
26 import org.apache.commons.logging.Log;
27 import org.apache.commons.logging.LogFactory;
28 import org.apache.tuscany.common.monitor.MonitorFactory;
29
30 public class CommonsLoggingMonitorFactory implements MonitorFactory {
31
32 private final Map <Class <?>, WeakReference <?>> proxies = new WeakHashMap <Class <?>, WeakReference <?>>();
33
34 public CommonsLoggingMonitorFactory() {
35 }
36
37 public <T> T getMonitor(Class <T> monitorInterface) {
38 T proxy = getCachedMonitor(monitorInterface);
39 if (proxy == null) {
40 proxy = createMonitor(monitorInterface);
41 proxies.put(monitorInterface, new WeakReference <T>(proxy));
42 }
43 return proxy;
44 }
45
46 private <T>T getCachedMonitor(Class <T> monitorInterface) {
47 WeakReference <T> ref = (WeakReference <T>) proxies.get(monitorInterface);
48 return (ref != null) ? ref.get() : null;
49 }
50
51 private <T>T createMonitor(Class <T> monitorInterface) {
52 String className = monitorInterface.getName();
53 Log logger = LogFactory.getLog(className);
54 InvocationHandler handler = new LoggingHandler(logger);
55 return (T) Proxy.newProxyInstance(monitorInterface.getClassLoader(), new Class <?>[]{monitorInterface}, handler);
56 }
57
58 private static final class LoggingHandler implements InvocationHandler {
59 private final Log logger;
60
61 public LoggingHandler(Log logger) {
62 this.logger = logger;
63 }
64
65 public Object invoke(Object proxy, Method method, Object [] args) throws Throwable {
66 String sourceMethod = method.getName();
67 if (logger.isDebugEnabled()) {
68 if (args != null && args.length == 1 && args[0] instanceof Throwable ) {
70 logger.debug(sourceMethod, (Throwable ) args[0]);
71 } else {
72 StringBuilder sb = new StringBuilder ();
73 sb.append(sourceMethod);
74 sb.append("(");
75 for (int i = 0; i < args.length; i++) {
76 if (i > 0) {
77 sb.append(", ");
78 }
79 sb.append(args[i]);
80 }
81 sb.append(")");
82 logger.debug(sb.toString());
83 }
84 }
85 return null;
86 }
87 }
88 }
89 |
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