Java Reference
In-Depth Information
closing of the resource being read as well as maintaining the ExecutionContext as records are being read.
However, if you implement your own, you need to manage that yourself. Since you are just wrapping a
Spring Batch ItemReader (the FlatFileItemReader), you can use it to maintain those resources.
To configure the CustomerFileReader, the only dependency you have is the delegate. The delegate
in this case is the reader that will do the actual reading and parsing work for you. Listing 7-27 shows the
configuration for the CustomerFileReader.
Listing 7-27.
CustomerFileReader Configuration
…
<beans:bean id="customerFile"
class="org.springframework.core.io.FileSystemResyource" scope="step">
<beans:constructor-arg value="#{jobParameters[customerFile]}"/>
</beans:bean>
<beans:bean id="customerFileReader"
class="com.apress.springbatch.chapter7.CustomerFileReader">
<beans:property name="delegate" ref="trueCustomerFileReader"/>
</beans:bean>
<beans:bean id="trueCustomerFileReader"
class="org.springframework.batch.item.file.FlatFileItemReader">
<beans:property name="resource" ref="customerFile" />
<beans:property name="lineMapper">
<beans:bean class="org.springframework.batch.item.file.mapping.
PatternMatchingCompositeLineMapper">
<beans:property name="tokenizers">
<beans:map>
<beans:entry key="CUST*" value-ref="customerLineTokenizer"/>
<beans:entry key="TRANS*" value-ref="transactionLineTokenizer"/>
</beans:map>
</beans:property>
<beans:property name="fieldSetMappers">
<beans:map>
<beans:entry key="CUST*" value-ref="customerFieldSetMapper"/>
<beans:entry key="TRANS*" value-ref="transactionFieldSetMapper"/>
</beans:map>
</beans:property>
</beans:bean>
</beans:property>
</beans:bean>
<beans:bean id="customerLineTokenizer"
class="org.springframework.batch.item.file.transform.
DelimitedLineTokenizer">
<beans:property name="names" value="prefix,firstName,middleInitial,
lastName,address,city,state,zip"/>
<beans:property name="delimiter" value=","/>
</beans:bean>
<beans:bean id="transactionLineTokenizer"
class="org.springframework.batch.item.file.transform.
