Package com.broadleafcommerce.promotion.offer.service.helper

Class IdSeekPageIterator<T extends com.broadleafcommerce.data.tracking.core.Trackable>

java.lang.Object

com.broadleafcommerce.promotion.offer.service.helper.IdSeekPageIterator<T>

All Implemented Interfaces:

Iterator<T>

public class IdSeekPageIterator<T extends com.broadleafcommerce.data.tracking.core.Trackable>
extends Object
implements Iterator<T>

Iterator that performs "seek" pagination.

See here for a description of the seek pagination strategy.

Externally, this can be used as a regular iterator that will return one element at a time until there are none left. However, the implementation will retrieve results in batches/pages from a given source when needed. This allows for a combination of lazy loading (to avoid loading large datasets as a whole, which can overwhelm resources) and batching (to avoid excessive round trips due to lazy loading).

To perform the batching/pagination, this iterator requires a data source capable of performing seek pagination.

Constructor Summary

Constructors

Constructor	Description
IdSeekPageIterator(BiFunction<String,Integer,List<T>> source, int pageSize)

Method Summary

Modifier and Type	Method	Description
boolean	hasNext()
T	next()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Details

IdSeekPageIterator

public IdSeekPageIterator(BiFunction<String,Integer,List<T>> source,
 int pageSize)

Method Details

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T extends com.broadleafcommerce.data.tracking.core.Trackable>

next

public T next()

Specified by:

next in interface Iterator<T extends com.broadleafcommerce.data.tracking.core.Trackable>