Overriding write(List<? extends T>) method of StaxEventItemWriter

[emilio.remogna]

Hi everybody,

passing data through steps is OK.

To avoid writing too many data in the execution context, I decided to use an holder bean.

The holder bean

public class AuthorListHolder {
	
	private List<Author> authorList;

	public List<Author> getAuthorList() {
		
		return authorList;
	}

	public void setAuthorList(List<Author> authorList) {
		
		this.authorList = authorList;
	}
}

Config snippets

<bean id="authorListHolder" class="..."/>

<bean id="savingAuthorListItemWriter" class="...">
	<property name="authorListHolder" ref="authorListHolder"/>
</bean>

<bean id="retrievingAuthorItemReader" class="...">
	<property name="authorListHolder" ref="authorListHolder"/>
</bean>

The write method of the writer

@Override
public void write(List<? extends List<Author>> items)throws Exception {
	
	for(List<Author> authorList : items) {
		
		// my SavingAuthorListItemWriter.setAuthorListHolder contains: this.authorListHolder.setAuthorList(new ArrayList<Author>());
		authorListHolder.getGroupList().addAll(authorList);
	}
}

The read method of the reader

@Override
public Author read() throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException {
	
	if(!authorListHolder.getAuthorList().isEmpty()) {
		
		return authorListHolder.getAuthorList().remove(0);
	}
	
	return null;
}

I think the holder bean solution is ok, because it allowed me to restore DB job repository and to have a cleaner code.

Thank you for your patience!

[psoares]

Nice !
It looks a lot cleaner than passing things to the jobContext map !
Thanks for the tip ;-)

[victory12]

So, following this, I took a concrete example with a simple object called "Author", having 2 properties (first and last name).
I define an XSD schema for it, assuming you already have one for your object, but this is just for the demo :
HTML Code:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://com.authors/batch"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://com.authors/batch"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xsd:element name="Authors">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="Author" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="Author">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="FirstName" type="xsd:string" />
<xsd:element name="LastName" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
</xsd:element>

</xsd:schema>

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