Package org.springframework.batch.item.database.builder

Class JpaPagingItemReaderBuilder<T>

java.lang.Object

org.springframework.batch.item.database.builder.JpaPagingItemReaderBuilder<T>

public class JpaPagingItemReaderBuilder<T>
extends Object

Creates a fully qualified JpaPagingItemReader.

Since:

4.0

Author:

Michael Minella, Glenn Renfro

Constructor Summary

Constructors

Constructor	Description
JpaPagingItemReaderBuilder()

Method Summary

Modifier and Type	Method	Description
JpaPagingItemReader<T>	build()	Returns a fully constructed JpaPagingItemReader.
JpaPagingItemReaderBuilder<T>	currentItemCount(int currentItemCount)	Index for the current item.
JpaPagingItemReaderBuilder<T>	entityManagerFactory(jakarta.persistence.EntityManagerFactory entityManagerFactory)	The EntityManagerFactory to be used for executing the configured queryString.
JpaPagingItemReaderBuilder<T>	maxItemCount(int maxItemCount)	Configure the max number of items to be read.
JpaPagingItemReaderBuilder<T>	name(String name)	The name used to calculate the key within the ExecutionContext.
JpaPagingItemReaderBuilder<T>	pageSize(int pageSize)	The number of records to request per page/query.
JpaPagingItemReaderBuilder<T>	parameterValues(Map<String,Object> parameterValues)	A map of parameter values to be set on the query.
JpaPagingItemReaderBuilder<T>	queryProvider(JpaQueryProvider queryProvider)	A query provider.
JpaPagingItemReaderBuilder<T>	queryString(String queryString)	The HQL query string to execute.
JpaPagingItemReaderBuilder<T>	saveState(boolean saveState)	Configure if the state of the ItemStreamSupport should be persisted within the ExecutionContext for restart purposes.
JpaPagingItemReaderBuilder<T>	transacted(boolean transacted)	Indicates if a transaction should be created around the read (true by default).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

JpaPagingItemReaderBuilder

public JpaPagingItemReaderBuilder()

Method Details

saveState

public JpaPagingItemReaderBuilder<T> saveState(boolean saveState)

Configure if the state of the ItemStreamSupport should be persisted within the ExecutionContext for restart purposes.

Parameters:

saveState - defaults to true

Returns:

The current instance of the builder.

name

public JpaPagingItemReaderBuilder<T> name(String name)

The name used to calculate the key within the ExecutionContext. Required if saveState(boolean) is set to true.

Parameters:

name - name of the reader instance

Returns:

The current instance of the builder.

See Also:

• ItemStreamSupport.setName(String)

maxItemCount

public JpaPagingItemReaderBuilder<T> maxItemCount(int maxItemCount)

Configure the max number of items to be read.

Parameters:

maxItemCount - the max items to be read

Returns:

The current instance of the builder.

See Also:

• AbstractItemCountingItemStreamItemReader.setMaxItemCount(int)

currentItemCount

public JpaPagingItemReaderBuilder<T> currentItemCount(int currentItemCount)

Index for the current item. Used on restarts to indicate where to start from.

Parameters:

currentItemCount - current index

Returns:

this instance for method chaining

See Also:

• AbstractItemCountingItemStreamItemReader.setCurrentItemCount(int)

pageSize

public JpaPagingItemReaderBuilder<T> pageSize(int pageSize)

The number of records to request per page/query. Defaults to 10. Must be greater than zero.

Parameters:

pageSize - number of items

Returns:

this instance for method chaining

See Also:

• AbstractPagingItemReader.setPageSize(int)

parameterValues

public JpaPagingItemReaderBuilder<T> parameterValues(Map<String,Object> parameterValues)

A map of parameter values to be set on the query. The key of the map is the name of the parameter to be set with the value being the value to be set.

Parameters:

parameterValues - map of values

Returns:

this instance for method chaining

See Also:

• JpaPagingItemReader.setParameterValues(Map)

queryProvider

public JpaPagingItemReaderBuilder<T> queryProvider(JpaQueryProvider queryProvider)

A query provider. This should be set only if queryString(String) have not been set.

Parameters:

queryProvider - the query provider

Returns:

this instance for method chaining

See Also:

• JpaPagingItemReader.setQueryProvider(JpaQueryProvider)

queryString

public JpaPagingItemReaderBuilder<T> queryString(String queryString)

The HQL query string to execute. This should only be set if queryProvider(JpaQueryProvider) has not been set.

Parameters:

queryString - the HQL query

Returns:

this instance for method chaining

See Also:

• JpaPagingItemReader.setQueryString(String)

transacted

public JpaPagingItemReaderBuilder<T> transacted(boolean transacted)

Indicates if a transaction should be created around the read (true by default). Can be set to false in cases where JPA implementation doesn't support a particular transaction, however this may cause object inconsistency in the EntityManagerFactory.

Parameters:

transacted - defaults to true

Returns:

this instance for method chaining

See Also:

• JpaPagingItemReader.setTransacted(boolean)

entityManagerFactory

public JpaPagingItemReaderBuilder<T> entityManagerFactory(jakarta.persistence.EntityManagerFactory entityManagerFactory)

The EntityManagerFactory to be used for executing the configured queryString.

Parameters:

entityManagerFactory - EntityManagerFactory used to create EntityManager

Returns:

this instance for method chaining

build

public JpaPagingItemReader<T> build()

Returns a fully constructed JpaPagingItemReader.

Returns:

a new JpaPagingItemReader