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From "Christoph Kiehl (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-989) Modify LazyQueryResultImpl to allow resultFetchSize to be set programmatically
Date Sat, 04 Aug 2007 01:19:53 GMT

     [ https://issues.apache.org/jira/browse/JCR-989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christoph Kiehl updated JCR-989:
--------------------------------

    Attachment: jackrabbit-core.patch
                jackrabbit-api.patch

I finally made it. Took me a bit more than a few days however ;)

I decided to create a new interface JackrabbitQuery in jackrabbit-api which includes the two
methods setOffset() and setLimit() which will probably be part of JCR 2.0. This way you don't
have to cast your Query instance to QueryImpl but rather JackrabbitQuery. This hopefully makes
it more accessible to users and looks less like a hack. 

((QueryImpl) query).setLimit(123)

vs

((JackrabbitQuery) query).setLimit(123)

This opens the possibility to provide an RMI implementation to support those two methods over
RMI as well.

Everything else was quite straight forward. There are two patches: one for jackrabbit-api
containing the interface and one for jackrabbit-core containing the actual code changes. WDYT?

> Modify LazyQueryResultImpl to allow resultFetchSize to be set programmatically
> ------------------------------------------------------------------------------
>
>                 Key: JCR-989
>                 URL: https://issues.apache.org/jira/browse/JCR-989
>             Project: Jackrabbit
>          Issue Type: New Feature
>          Components: query
>    Affects Versions: 1.3
>            Reporter: Christoph Kiehl
>            Assignee: Christoph Kiehl
>            Priority: Minor
>         Attachments: jackrabbit-api.patch, jackrabbit-core.patch
>
>
> In our application we have a search which only shows part of a query result. We always
know which part of the result needs to be shown. This means we know in advance how many results
need to be fetched. I would like to be able to programmatically set resultFetchSize to minimize
the number of loaded lucene docs and therefore improve the performance.
> I know it is already possible to the set the resultFetchSize via the index configuration,
but this number is fixed and doesn't work well in environments where you use paging for your
results because if you set this number too low the query will be executed multiple times and
if you set it too high too many lucene docs are loaded.

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