Seam Annotation

How to create and use a self-defined annotaion in Seam?

 

 

1. create annotation intercepter class, following annotations can set some properties for this annotation. 

 

@Interceptor(around = { SeamInterceptor.class, EventInterceptor.class } ) public class TimingInterceptor { @AroundInvoke public Object timeCall(String str) { return "test"; } }

 

2. define marker annotation. 

 

Note:
在使用Retention型態時，需要提供java.lang.annotation.RetentionPolicy的枚舉型態
package java.lang.annotation;
public enum RetentionPolicy
{
SOURCE, //編譯程序處理完Annotation信息後就完成任務
CLASS, //編譯程序將Annotation儲存於class檔中，缺省
RUNTIME //編譯程序將Annotation儲存於class檔中，可由VM讀入
}

 

@Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Interceptors(TimingInterceptor.class) public @interface PerformanceTest { }

 

3. imply the self-define annotation in the needed programm.Note: so when call some method of LoadPageInfor, it will call the TimeInterceptor.timeCall();

 

 

@PerformanceTest public class LoadPageInfor{ ... }