I am using RankQuery to implement my applicative scorer that returns a score
based on the value of specific field (lets call it 'score_field') that is
stored for every document.
The RankQuery creates a collector, and for every collected docId I retrieve
the value of score_field, calculate the score and add the doc id into
priority queue:
public class MyScorerrankQuet extends RankQuery {
...
@Override
public TopDocsCollector getTopDocsCollector(int i,
SolrIndexerSearcher.QueryCommand cmd, IndexSearcher searcher) {
...
return new MyCollector(...)
}
}
public class MyCollector extends TopDocsCollector{
MyScorer scorer;
SortedDocValues scoreFieldValues; //Initialized in constrctor
public MyCollector(){
scorer = new MyScorer();
scorer.start(); //the scorer's API needs to call start()
before every query and close() at the end of the query
AtomicReader r =
SlowCompositeReaderWrapper.wrap(searcher.getIndexReader());
scoreFieldValues = DocValues.getSorted(r, "score_field");
/*
THIS CALL IS TIME CONSUMING! */
}
@Override
public void collect(int id){
int docID = docBase + id;
//1. get specific field from the doc using DocValues and
calculate score using my scorer
String value = scoreFieldValues.get(docID).utf8ToString();
scorer.calcScore(value);
//2. add docId and score (ScoreDoc object) into
PriorityQueue.
}
}
I used DocValues to get the value of score_field. Currently its being
instantiate in collector's constructor - which is performance killer,
because it is being called for EVERY query, even if the index is static (no
commits). I want to make the DocValue.getStored() call only when it is
really necessary, but I dont know where to put that code. Is there a place
to plug that code so when a new searcher is being opened I can add my this
applicative cache?
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