Help me understand this piece of code

[Girish Vasmatkar]

Hey Guys,

I'm new to spring and working on a project involving spring. We are building the app from scratch and I have been given the Job of handling spring related stuff.

I've created daos and all that stuff and now working on the service layer. During my search, I found a sample application and was looking in the code of the application to see how the things are done in spring. However, I was stuck at the following code snippet in the service bean file:

  

<bean id="abstractService" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
          abstract="true">
        <property name="transactionManager" ref="transactionManager"/>
        <property name="transactionAttributes">
            <props>
                <prop key="insert">PROPAGATION_REQUIRED</prop>
                <prop key="update">PROPAGATION_REQUIRED</prop>
                <prop key="delete">PROPAGATION_REQUIRED</prop>
                <prop key="withdraw">PROPAGATION_REQUIRED</prop>
                <prop key="charge">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>

    <bean id="userService" parent="abstractService" singleton="true">
        <property name="target">
            <bean class="com.softnet.service.impl.UserServiceImpl">
                <property name="daoFactory" ref="daoFactory"/>
            </bean>
        </property>
    </bean>
    <bean id="accountService" parent="abstractService" singleton="true">
        <property name="target">
            <bean class="com.softnet.service.impl.AccountServiceImpl">
                <property name="daoFactory" ref="daoFactory"/>
            </bean>
        </property>
    </bean>

I feel lost when I see all those PROPAGATION_REQUIRED and the the target value of name parameter.

I have a feature in my app for the user to search. So, I wanted to write a SearchService class. Should I blindly follow what's been done in the above mentioned code?
I do feel that I get a better understanding of the code above before going ahead.

Thanks!!!

[Nathan Pruett]

All the things with PROPAGATION_REQUIRED in the abstractService (and the other services specifying parent="abstractService" ) are to support transactions. I doubt you'll need transaction support to do search, so you won't need to specify any of this.