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/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/
///////////////////////////////////////////////////////////////////////////////////////
public interface IMessageWriter {
public void writeMessage();
}
///////////////////////////////////////////////////////////////////////////////////////
public class MessageWriter implements IMessageWriter{
public void writeMessage() {
System.out.print("World");
}
}
///////////////////////////////////////////////////////////////////////////////////////
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class MessageDecorator implements MethodInterceptor {
public Object invoke(MethodInvocation invocation) throws Throwable {
System.out.print("Hello ");
Object retVal = invocation.proceed();
System.out.println("!");
return retVal;
}
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.aop.framework.ProxyFactory;
public class HelloWorldAOPExample {
public static void main(String[] args) {
MessageWriter target = new MessageWriter();
// create the proxy
ProxyFactory pf = new ProxyFactory();
pf.addAdvice(new MessageDecorator());
pf.setTarget(target);
MessageWriter proxy = (MessageWriter) pf.getProxy();
// write the messages
target.writeMessage();
System.out.println("");
proxy.writeMessage();
}
}
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