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1
8 package jfun.yan;
9
15
16
22 class GuardedComponent<T> extends DelegatingComponent {
23 private transient ThreadLocal  run_guard = new ThreadLocal ();
24 private transient ThreadLocal verify_guard = new ThreadLocal ();
25 private transient ThreadLocal get_type_guard = new ThreadLocal ();
26 private void readObject(java.io.ObjectInputStream in)
27 throws ClassNotFoundException , java.io.IOException {
28 in.defaultReadObject();
29 run_guard = new ThreadLocal ();
30 verify_guard = new ThreadLocal ();
31 get_type_guard = new ThreadLocal ();
32 }
33 private void enter(ThreadLocal g){
34 final Object frame = g.get();
35 if(frame==null){
36 g.set(this);
37 }
38 else{
39 throw new CyclicDependencyException();
40 }
41 }
42 private void leave(ThreadLocal g){
43 g.set(null);
44 }
45
46 GuardedComponent(final Component<T> cc) {
47 super(cc);
48 }
49
50 public Object create(Dependency ac){
51 enter(run_guard);
52 try{
53 return super.create(ac);
54 }
55 finally{leave(run_guard);}
56 }
57 public Class verify(Dependency ac){
58 enter(verify_guard);
59 try{
60 return super.verify(ac);
61 }
62 finally{leave(verify_guard);}
63 }
64 public Class getType(){
65 enter(get_type_guard);
66 try{
67 return super.getType();
68 }
69 finally{leave(get_type_guard);}
70
71 }
72 public Component guard(){return this;}
73 public boolean isSingleton(){
74 return getDelegateTarget().isSingleton();
75 }
76 }
77 |
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