[jira] [Created] (SOLR-4726) Factor out a minimal abstract class from IndexSchema/ManagedIndexSchema

["Steve Rowe (JIRA)" <ji...@apache.org>]

Steve Rowe created SOLR-4726:
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             Summary: Factor out a minimal abstract class from IndexSchema/ManagedIndexSchema 
                 Key: SOLR-4726
                 URL: https://issues.apache.org/jira/browse/SOLR-4726
             Project: Solr
          Issue Type: Task
          Components: Schema and Analysis
            Reporter: Steve Rowe
            Priority: Minor


Spinoff from SOLR-3251.

[~rcmuir] wrote, on SOLR-4658 and SOLR-3251:

{quote}
If the goal is to have multiple implementations of indexschema (immutable ones backed by human edited files, mutable ones saved to some opaque "database" that can be edited by REST), then why not make IndexSchema abstract and pluggable from solrconfig.xml like anything else?
{quote}

{quote}
So IndexSchema becomes abstract and loaded just like other plugins, versus being a "wonder-do-it-all" class. It would also
have the advantage of not having a bunch of options that have illegal combinations (e.g. managed+mutable)

Finally it makes it extensible: if someone wants to make their own impl that is powered by microsoft access .MDB files then
they can do so.

(Also i think it would make backwards compatibility possible in case something changes in drastic ways).
{quote}

{quote}
and it would also be a bonus in the future if somehow the backwards cruft existing in various FieldType etc  apis (e.g. defaults and so on) were factored into the Classic guy to keep those apis simpler...
{quote}

{quote}
>From a pluggability perspective it would be nice if e.g. addFields was factored down (e.g. IndexSchema becomes abstract and minimal), and the immutable default impl threw UOE for changes or whatever... But i know this is a lot of work, it would be a good followup issue and probably good to do before schema gets any more hair (there is already tons of backwards cruft thrown about it for compat etc too).
{quote}

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