circuitbreaker/invocations/AnnotatedInvocation.java

package dk.thoerup.circuitbreaker.invocations;

/* a annotation based invocation if it infeasible or you just don't like to implement yet another interface 
 * 
 *      class MyInvocation {
 *              @CircuitBreakerMethod
 *              public void doSomething() {}
 *      }
 *      
 *      ..... snip......
 *
 *      MyInvocation my = new MyInvocation(); 
 *      AnnotatedInvocation invok = new AnnotatedInvocation(my);
 *  Object out = CircuitBreakerManager.getManager().getCircuitBreaker("mycb").invoke(invok);
 * 
 */


import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import dk.thoerup.circuitbreaker.CircuitInvocation;

public class AnnotatedInvocation<T> implements CircuitInvocation<T> {
        
        public static class CBAnnotationException extends Exception {
                public CBAnnotationException() {
                        super("No method found annotated with @CircuitBreakerMethod");
                }
                private static final long serialVersionUID = 1L;
                
        }
        
        private Object obj;
        
        public AnnotatedInvocation(Object obj) {
                this.obj = obj;
        }

        @SuppressWarnings("unchecked")
        public T proceed() throws Exception {
                
                Method methods[] = obj.getClass().getMethods();
                for(Method current : methods) {
                        Annotation anno = current.getAnnotation(CircuitBreakerMethod.class);

                        
                        if (anno != null ) {
                                try {
                                        return (T) current.invoke(obj, (Object[])null); //invoke the first method annotated
                                } catch (InvocationTargetException e) {
                                        throw (Exception) e.getCause(); //unwrap any exception from InvocationTargetException
                                }
                        }
                        
                }
                
                throw new CBAnnotationException(); //if no method was found
        }
}
1	torben	1290	package dk.thoerup.circuitbreaker.invocations;
2
3			/* a annotation based invocation if it infeasible or you just don't like to implement yet another interface
4			*
5			* class MyInvocation {
6			* @CircuitBreakerMethod
7			* public void doSomething() {}
8			* }
9			*
10			* ..... snip......
11			*
12			* MyInvocation my = new MyInvocation();
13			* AnnotatedInvocation invok = new AnnotatedInvocation(my);
14			* Object out = CircuitBreakerManager.getManager().getCircuitBreaker("mycb").invoke(invok);
15			*
16			*/
17
18
19			import java.lang.annotation.Annotation;
20			import java.lang.reflect.InvocationTargetException;
21			import java.lang.reflect.Method;
22
23			import dk.thoerup.circuitbreaker.CircuitInvocation;
24
25	torben	3212	public class AnnotatedInvocation<T> implements CircuitInvocation<T> {
26	torben	1290
27	torben	2572	public static class CBAnnotationException extends Exception {
28	torben	1290	public CBAnnotationException() {
29			super("No method found annotated with @CircuitBreakerMethod");
30			}
31			private static final long serialVersionUID = 1L;
32
33			}
34
35			private Object obj;
36
37			public AnnotatedInvocation(Object obj) {
38			this.obj = obj;
39			}
40
41	torben	3212	@SuppressWarnings("unchecked")
42			public T proceed() throws Exception {
43	torben	1290
44			Method methods[] = obj.getClass().getMethods();
45			for(Method current : methods) {
46			Annotation anno = current.getAnnotation(CircuitBreakerMethod.class);
47
48
49			if (anno != null ) {
50			try {
51	torben	3212	return (T) current.invoke(obj, (Object[])null); //invoke the first method annotated
52	torben	1290	} catch (InvocationTargetException e) {
53			throw (Exception) e.getCause(); //unwrap any exception from InvocationTargetException
54			}
55			}
56
57			}
58
59			throw new CBAnnotationException(); //if no method was found
60			}
61			}