Jake Mannix a écrit :
Gabriel,
You can make this search much more efficient as follows: say that you have
a method
public BooleanQuery createQuery(Collection<String> allowedUUIDs);
that works as you describe. Then you can easily create a useful reusable
filter as follows:
Filter filter = new CachingWrapperFilter(new
QueryFilter(createQuery(uuidCollection)));
this filter will cache BitSets keyed on IndexReader instances, so hang
onto it and use it for
the entire time your uuidCollection doesn't change.
Hope this helps.
-jake
Hi,
yes it helps!
As a result, I will not use my own BitSet cache mechanism. I have been
dumb when I believed that I couldn't create a SHOULD query on >1024
terms, as I can create inner BooleanQuery...
Just as note, QueryFilter is deprecated, QueryWrapperFilter replaces it.
The new code :
private Query createQuery(Collection<String> visibleItems) {
int maxTerms = BooleanQuery.getMaxClauseCount() - 1;
int i = 0;
boolean subQueryIsQuery = true;
BooleanQuery query = new BooleanQuery();
BooleanQuery subQuery = new BooleanQuery();
for (String string : visibleItems) {
subQuery.add(new TermQuery(new Term(KEY_UUID, string)),
BooleanClause.Occur.SHOULD);
if (i % maxTerms == 0) {
subQueryIsQuery = false;
query.add(new BooleanClause(subQuery,
BooleanClause.Occur.SHOULD));
subQuery = new BooleanQuery();
}
i++;
}
if (subQueryIsQuery) {
return subQuery;
}
return query;
}
private Filter createFilter(Collection<String> visibleItems) throws
SimExplorerTechnicalException {
Filter filter = new CachingWrapperFilter(new
QueryWrapperFilter(createQuery(visibleItems)));
return filter;
}
Not tested yet, but looks good.
Thanks a lot!
Gabriel
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