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Although not recommended it is possible to change the class name in the personDirectory.xml beans declaration to be a custom class of your choice, so long as it implements IPersonAttributeDao. You could then write a custom implementation that does exactly the queries, caching, and any other behavior you need.
<beans>
<!-- notice that the bean's class has changed - ->
<bean id="personAttributeDao">
<!-- if you're implementing all your configuration directly in the Java, you need not
add any properties here -->
</bean>
</beans>