lux.solr

Class CloudSearchIterator

java.lang.Object

lux.SearchIteratorBase

lux.solr.CloudSearchIterator

All Implemented Interfaces:

net.sf.saxon.om.SequenceIterator<net.sf.saxon.om.NodeInfo>

public class CloudSearchIterator
extends SearchIteratorBase

Perform distributed XQuery searches. We mimic lazy evaluation by maintaining an iterator that re-issues requests when its local cache is exhausted. Note: deep paging may be quite expensive since *all* results starting with the first must be retrieved for each page! TODO: We could optimize better if we kept track of per-shard positions. To do that we'd have to know which shard each result came from. This info is held in ResponseBuilder.resultIds, which is a map from id to ShardDoc; each ShardDoc has a shard id. We can count the # of docs from each shard and calculate a position from that.

Field Summary

Fields inherited from class lux.SearchIteratorBase

current, eval, MISSING_LAST, position, sortCriteria, start, stats

Fields inherited from interface net.sf.saxon.om.SequenceIterator

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

Constructors

Constructor and Description
CloudSearchIterator(Evaluator eval, String query, SearchBase.QueryParser queryParser, String[] sortCriteria, int start1) Initialize the iterator

Method Summary

Methods

Modifier and Type	Method and Description
long	count()
net.sf.saxon.om.SequenceIterator<net.sf.saxon.om.NodeInfo>	getAnother()
int	getLimit()
net.sf.saxon.om.NodeInfo	next()
void	setLimit(int limit)

Methods inherited from class lux.SearchIteratorBase

close, current, getProperties, makeSortFromCriteria, position

Methods inherited from class java.lang.Object

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

Constructor Detail

CloudSearchIterator

public CloudSearchIterator(Evaluator eval,
                   String query,
                   SearchBase.QueryParser queryParser,
                   String[] sortCriteria,
                   int start1)

Initialize the iterator

Parameters:

eval - the Evaluator holds context for the query

query - the Lucene query to execute and iterate

queryParser - either blank (for the default qp), or 'xml' for the xml query parser TODO: enum

sortCriteria - the sort order for the results

start1 - the 1-based start position at which to begin the iteration

Method Detail

getAnother

public net.sf.saxon.om.SequenceIterator<net.sf.saxon.om.NodeInfo> getAnother()
                                                                      throws net.sf.saxon.trans.XPathException

Throws:

net.sf.saxon.trans.XPathException

count

public long count()

next

public net.sf.saxon.om.NodeInfo next()
                              throws net.sf.saxon.trans.XPathException

Throws:

net.sf.saxon.trans.XPathException

setLimit

public void setLimit(int limit)

Parameters:

limit - the maximum number of results to retrieve per batch

getLimit

public int getLimit()

Returns:

the maximum number of results to retrieve per batch