Is there a way to enable disable aspects/proxying at run-time ?

Below are my bean definitions.
Code:
<bean id="performanceAdvice" 
class="org.springframework.aop.interceptor.PerformanceMonitorInterceptor"/>


<aop:config>
	
     <aop:pointcut id="executePointCut" expression="execution(* IDao.execute*(..))" />
    <aop:advisor id="PerfAdvisorForExecutepointcut" 
pointcut-ref="executePointCut"  	     
advice-ref="performanceAdvice"/>
	              
	
</aop:config>
Basically, I am applying spring's PerformanceMonitorInterceptor as my advisor
for all objects that impl my interface IDao and for the methods that match the
pattern execute*

The aop configs work fine and I am able to get the performance metrics
from PerformanceMonitorInterceptor ..
But how would I enable/disable this proxying at run-time ?