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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914163#action_12914163
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Ryan McKinley commented on LUCENE-2649:
---------------------------------------
Ok, as I look more, I think it may be worth some even bigger changes!
Is there any advantage to having a different map for each Type? The double
(and triple) cache can get a bit crazy and lead to so much duplication
What about moving to a FieldCache that is centered around the very basic API:
{code:java}
public <T> T get(IndexReader reader, String field, EntryCreator<T> creator)
{code}
Entry creator would be something like
{code:java}
public abstract static class EntryCreator<T> implements Serializable
{
public abstract T create( IndexReader reader, String field );
public abstract void validate( T entry, IndexReader reader, String field );
/**
* NOTE: the hashCode is used as part of the cache Key, so make sure it
* only changes if you want different entries for the same field
*/
@Override
public int hashCode()
{
return EntryCreator.class.hashCode();
}
}
{code}
We could add all the utility functions that cast stuff to ByteValues etc. We
would also make sure that the Map does not use the EntryCreator as a key, but
uses it to generate a key.
A sample EntryCreator would look like this:
{code:java}
class BytesEntryCreator extends FieldCache.EntryCreator<ByteValues> {
@Override
public ByteValues create(IndexReader reader, String field)
{
// all the normal walking stuff using whatever parameters we have specified
}
@Override
public void validate(ByteValues entry, IndexReader reader, String field)
{
// all the normal walking stuff using whatever parameters we have specified
}
}
{code}
Thoughts on this approach?
Crazy how a seemingly simple issue just explodes :(
> FieldCache should include a BitSet for matching docs
> ----------------------------------------------------
>
> Key: LUCENE-2649
> URL: https://issues.apache.org/jira/browse/LUCENE-2649
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Ryan McKinley
> Fix For: 4.0
>
> Attachments: LUCENE-2649-FieldCacheWithBitSet.patch,
> LUCENE-2649-FieldCacheWithBitSet.patch,
> LUCENE-2649-FieldCacheWithBitSet.patch,
> LUCENE-2649-FieldCacheWithBitSet.patch, LUCENE-2649-FieldCacheWithBitSet.patch
>
>
> The FieldCache returns an array representing the values for each doc.
> However there is no way to know if the doc actually has a value.
> This should be changed to return an object representing the values *and* a
> BitSet for all valid docs.
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