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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2294) Create IndexWriterConfiguration and store all of IW configuration there
Date Thu, 04 Mar 2010 13:51:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841262#action_12841262
] 

Shai Erera commented on LUCENE-2294:
------------------------------------

I wouldn't worry about what's required - Directory will be left out, MFL is useless and a
pain anyway, so what's left is Analyzer. I can put Analyzer on IWC's ctor, but I personally
think we can default to a simple one (such as Whitespace) encouraging the people to set their
own. I find it very annoying today when I want to test something about IW and I need to pass
all these things to IW ...

The way I see it, those who want to rely on Lucene's latest and greatest can just do: IndexWriter
writer = new IndexWriter(dir, new IWC()); Well maybe except for the Analyzer, but I really
don't think it matters that much. And like you wrote, someone can chain the setters. So win-win?
If you don't care about anything, just wants to open a writer, index something and that's
it, you don't need to specify anything .. otherwise you just chain calls?

One thing I should add to IWC so far (I hope to post a patch even today) is a Version parameter.
For now it will be ignored, but as a placeholder to change settings in the future.

> Create IndexWriterConfiguration and store all of IW configuration there
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-2294
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2294
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Shai Erera
>             Fix For: 3.1
>
>
> I would like to factor out of all IW configuration parameters into a single configuration
class, which I propose to name IndexWriterConfiguration (or IndexWriterConfig). I want to
store there almost everything besides the Directory, and to reduce all the ctors down to one:
IndexWriter(Directory, IndexWriterConfiguration). What I was thinking of storing there are
the following parameters:
> * All of ctors parameters, except for Directory.
> * The different setters where it makes sense. For example I still think infoStream should
be set on IW directly.
> I'm thinking that IWC should expose everything in a setter/getter methods, and defaults
to whatever IW defaults today. Except for Analyzer which will need to be defined in the ctor
of IWC and won't have a setter.
> I am not sure why MaxFieldLength is required in all IW ctors, yet IW declares a DEFAULT
(which is an int and not MaxFieldLength). Do we still think that 10000 should be the default?
Why not default to UNLIMITED and otherwise let the application decide what LIMITED means for
it? I would like to make MFL optional on IWC and default to something, and I hope that default
will be UNLIMITED. We can document that on IWC, so that if anyone chooses to move to the new
API, he should be aware of that ...
> I plan to deprecate all the ctors and getters/setters and replace them by:
> * One ctor as described above
> * getIndexWriterConfiguration, or simply getConfig, which can then be queried for the
setting of interest.
> * About the setters, I think maybe we can just introduce a setConfig method which will
override everything that is overridable today, except for Analyzer. So someone could do iw.getConfig().setSomething();
iw.setConfig(newConfig);
> ** The setters on IWC can return an IWC to allow chaining set calls ... so the above
will turn into iw.setConfig(iw.getConfig().setSomething1().setSomething2()); 
> BTW, this is needed for Parallel Indexing (see LUCENE-1879), but I think it will greatly
simplify IW's API.
> I'll start to work on a patch.

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