AOP - Sample

gistfile1.txt

package com.springaction.knights;

public class BraveKnight implements Knight {
	
	private Quest quest;
	private Minstrel minstrel;

	public BraveKnight(Quest quest, Minstrel minstrel) {
		this.quest = quest;
		this.minstrel = minstrel;
	}

	/* should Knight manage his own minstrel??? */
	public void embarkQuest() throws QuestException {
		minstrel.singBeforeQuest();
		quest.embark();
		minstrel.singAfterQuest();
	}
}

===================== ApplicationContext.xml ===================== 

<beans>

	<bean id="knight" class="com.springaction.knights.BraveKnight">
		<constructor-arg ref="quest"/>
	</bean>

	<bean id="quest" class="com.springaction.knights.SlayDragonQuest">
		<constructor-arg value="#(T(System.out)"/>
	</bean>

	<bean id="minstrel" class="com.springaction.knights.Minstrel">
		<constructor-arg value="#(T(System.out)"/>
	</bean>

	<aop:config>
		<aop:aspect ref="minstrel">
			<aop:point-cut id="embark"
				expression="execution (* *.embarkOnQuest(..))"/>

			<aop:before pointcut-ref="embark" method="singBeforeQuest"/>

			<aop:after pointcut-ref="embark" method="singAfterQuest"/>
		</aop:aspect>
	</aop:config>

</beans>