Package io.datarouter.scanner

Class PagingScanner<K,T>

java.lang.Object

io.datarouter.scanner.BaseScanner<List<T>>

io.datarouter.scanner.PagingScanner<K,T>

All Implemented Interfaces:

Scanner<List<T>>, Closeable, AutoCloseable

public abstract class PagingScanner<K,T>
extends BaseScanner<List<T>>

Base class for things that page through results by passing the last item as an exclusive start key for the next page

Field Summary

Fields

Modifier and Type	Field	Description
protected final int	pageSize

Fields inherited from class io.datarouter.scanner.BaseScanner

current

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PagingScanner(int pageSize)

Method Summary

Modifier and Type	Method	Description
boolean	advance()	Try to update current to the next item, if there is one.
protected abstract List<T>	nextPage(Optional<K> resumeFrom)
protected abstract Optional<K>	nextParam(T lastSeenItem)	Subclass should transform the last seen item into a key for the next request

Methods inherited from class io.datarouter.scanner.BaseScanner

current

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.datarouter.scanner.Scanner

advanceUntil, advanceWhile, allMatch, anyMatch, append, append, append, apply, batch, close, collate, collate, collect, collect, concat, concatIter, count, deduplicateConsecutive, deduplicateConsecutiveBy, deduplicateConsecutiveBy, distinct, distinctBy, each, exclude, findFirst, findLast, findMax, findMin, flush, forEach, groupBy, groupBy, groupBy, groupBy, hasAny, include, isEmpty, iterable, iterator, limit, link, list, listTo, map, maxN, minN, noneMatch, parallel, prefetch, reduce, reduce, retain, reverse, sample, shuffle, skip, sort, sort, splitBy, stream, streamDoubles, streamInts, streamLongs, take, then, toArray, toMap, toMap, toMap, toMap, toMap, toMapSupplied, toMapSupplied, toMapSupplied, toMapSupplied

Field Details

pageSize

protected final int pageSize

Constructor Details

PagingScanner

protected PagingScanner(int pageSize)

Method Details

nextParam

protected abstract Optional<K> nextParam(T lastSeenItem)

Subclass should transform the last seen item into a key for the next request

nextPage

protected abstract List<T> nextPage(Optional<K> resumeFrom)

advance

public boolean advance()

Description copied from interface: Scanner

Try to update current to the next item, if there is one.

Returns:

True if it advanced