Spring集成hibernate配置service层事务的疑问

<bean id="transactionManager"
	class="org.springframework.orm.hibernate3.HibernateTransactionManager">
	<property name="sessionFactory">
		<ref local="sessionFactory" />
	</property>
</bean>

<bean name="transactionAttributes"
	class="org.springframework.transaction.interceptor.NameMatchTransactionAttributeSource">
	<property name="properties">
		<props>
			<prop key="init*">PROPAGATION_REQUIRED</prop>
			<prop key="save*">PROPAGATION_REQUIRED</prop>
			<prop key="add*">PROPAGATION_REQUIRED</prop>
			<prop key="submit*">PROPAGATION_REQUIRED</prop>
			<prop key="update*">PROPAGATION_REQUIRED</prop>
			<prop key="audit*">PROPAGATION_REQUIRED</prop>
			<prop key="report*">PROPAGATION_REQUIRED</prop>
			<prop key="del*">PROPAGATION_REQUIRED</prop>
			<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
			<prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
			<prop key="edit*">PROPAGATION_REQUIRED,readOnly</prop>
			<prop key="*">PROPAGATION_REQUIRED</prop>
		</props>
	</property>
</bean>

<bean id="nameMatchTxInterceptor"
	class="org.springframework.transaction.interceptor.TransactionInterceptor">
	<property name="transactionManager">
		<ref bean="transactionManager" />
	</property>
	<property name="transactionAttributeSource">
		<ref bean="transactionAttributes" />
	</property>
</bean>

<bean id="autoTxProxyCreator"
	class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
	<property name="interceptorNames">
		<list>
			<idref local="nameMatchTxInterceptor" />
		</list>
	</property>
	<property name="beanNames">
		<list>
			<value>*Service</value>
		</list>
	</property>
</bean>

如上的配置，以 Service 结尾的类全部应用此配置，那么问题来了：连接是在什么时候获取呢？（执行 service 方法之前？方法开始？……）