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1
8
9 package mx4j.tools.remote;
10
11 import java.lang.reflect.InvocationHandler  ;
12 import java.lang.reflect.InvocationTargetException ;
13 import java.lang.reflect.Method ;
14 import java.security.AccessControlContext ;
15 import java.security.PrivilegedExceptionAction ;
16 import java.util.Map ;
17 import javax.management.remote.JMXServerErrorException ;
18 import javax.security.auth.Subject ;
19
20 import mx4j.remote.MX4JRemoteUtils;
21
22
25 public abstract class SubjectInvoker implements InvocationHandler
26 {
27 private final Object target;
28 private final Subject subject;
29 private final AccessControlContext context;
30 private Map environment;
31
32 protected SubjectInvoker(Object target, Subject subject, AccessControlContext context, Map environment)
33 {
34 this.target = target;
35 this.subject = subject;
36 this.context = context;
37 this.environment = environment;
38 }
39
40 protected boolean isPlainInvoke(Method method)
41 {
42 String methodName = method.getName();
43 if ("toString".equals(methodName)) return true;
45 if ("hashCode".equals(methodName)) return true;
46 if ("equals".equals(methodName)) return true;
47 return false;
48 }
49
50 protected Object handleSpecialInvoke(Object target, Method method, Object [] args) throws Exception
51 {
52 throw new NoSuchMethodException (method.toString());
53 }
54
55 public Object invoke(Object proxy, Method method, Object [] args) throws Throwable
56 {
57 if (isPlainInvoke(method)) return chain(target, method, args);
58 if (method.getParameterTypes()[args.length - 1] == Subject .class)
59 {
60 Subject delegate = (Subject )args[args.length - 1];
61 return subjectInvoke(target, method, args, delegate);
62 }
63 else
64 {
65 return handleSpecialInvoke(target, method, args);
66 }
67 }
68
69 protected Object subjectInvoke(final Object proxy, final Method method, final Object [] args, Subject delegate) throws Exception
70 {
71 return MX4JRemoteUtils.subjectInvoke(subject, delegate, context, environment, new PrivilegedExceptionAction ()
72 {
73 public Object run() throws Exception
74 {
75 return chain(proxy, method, args);
76 }
77 });
78 }
79
80 protected Object chain(Object proxy, Method method, Object [] args) throws Exception
81 {
82 try
83 {
84 return method.invoke(proxy, args);
85 }
86 catch (InvocationTargetException x)
87 {
88 Throwable t = x.getTargetException();
89 if (t instanceof Exception ) throw (Exception )t;
90 throw new JMXServerErrorException ("Error thrown during invocation", (Error )t);
91 }
92 }
93 }
94 |
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