Hi folks,
I am using a MultiSearcher object which uses 4 months indexes. I have a
requirement for which i need to cache one field for documents which are less
then one month old. So for that i am first creating a date query(for last
one month) and using HitCollector.collect() for collecting Document ids for
all those documents who matched the criteria and save those ids in a
Bitset. And then i created an array of size equal to the number of
documents collected as a result. Now i iterate through the Bitset, and read
that particular field from each document and storing it the position which
matches with its document ids.
Here is the code snippet for that :
private ArrayList[] compIdCache = null;
public void warmUpFieldCache(MultiSearcher searcher, Query query) {
ArrayList list = null;
Document document = null;
String[] mappedCompanies = null;
try {
final BitSet bitSet = new BitSet(searcher.maxDoc());
searcher.search(query, new HitCollector() {
public void collect(int id, float score) {
bitSet.set(id);
}
});
compIdCache = new ArrayList [bitSet.cardinality()];
MapFieldSelector selector = new MapFieldSelector(new String[]
{COMPANY_ID});
for(int i=bitSet.nextSetBit(0); i>=0 && i < compIdCache.length;
i=bitSet.nextSetBit(i+1)) {
document = searcher.doc(i, selector);
mappedCompanies = document.getValues(COMPANY_ID);
compIdCache [i] = mappedCompanies ;
}
} catch (IOException e) {
logger.info("searcher.maxDoc() throws exception :"
+e.getMessage());
}
}
I have another method which queries for last month documents and uses their
document ids(collected using hitCollector.collect()) to extract field value
from the compIdCache.
So here i have a confusion : Is this way of solving the problem is fine ? or
are their some other ways to solve this problem.
