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From "Shalin Shekhar Mangar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1060) a new DIH EnityProcessor allowing text file lists of files to be indexed
Date Wed, 15 Apr 2009 16:48:15 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699273#action_12699273
] 

Shalin Shekhar Mangar commented on SOLR-1060:
---------------------------------------------

bq. Are you referring to the fragment of code inside ChangeListEntityProcessor that opens
the changelist, and its similarity to the functionality in URIDataSource?

Yes.

bq. I had not thought about arranging some kind of nested use of URIDataSource... is that
what you are thinking about? 

Not exactly. EntityProcessors do not access http/files directly. That's what DataSources are
for. The ChangeListEntityProcessor should just use the context.getDataSource() instead of
creating URLConnection directly. The only problem with that approach is that the baseLocation
must be specified on the <dataSource>. If you really need it to be returned with the
row, you can put a template field with its value, assuming the baseLocation is fixed.

The more I look at this, the more I feel that the name 'ChangeListEntityProcessor' is misleading.
It doesn't really do any changes. It is actually what I imagined a LineEntityProcessor would
be. It just streams lines one by one after accepting or rejecting some lines with regex. Whatever
else you need to do (for your original use-case), can be done with nested entities and/or
custom transformers.

What are the changes to TestRegexTransformer that this patch includes? Are these tests that
you wrote for the RegexTransformer improvements/fixes that you found earlier? If yes, we should
commit them through a different issue. Same should be done for the URIDataSource and associated
changes.

What do you think?

> a new DIH EnityProcessor allowing text file lists of files to be indexed
> ------------------------------------------------------------------------
>
>                 Key: SOLR-1060
>                 URL: https://issues.apache.org/jira/browse/SOLR-1060
>             Project: Solr
>          Issue Type: New Feature
>          Components: contrib - DataImportHandler
>    Affects Versions: 1.4
>            Reporter: Fergus McMenemie
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 1.4
>
>         Attachments: regex-fix.patch, SOLR-1060.patch, SOLR-1060.patch, SOLR-1060.patch,
SOLR-1060.patch, SOLR-1060.patch
>
>   Original Estimate: 120h
>  Remaining Estimate: 120h
>
> I have finished a new DIH EntityProcessor. It is designed around the idea that whatever
demon is used to maintain your content store it is likely to drop a report or log file explaining
what has changed within your content store. I wish to use this report file to control the
indexing of the new or changed content and the removal of old content. The report files, perhaps
from un-tar or un-zip, are likely to reference jpegs and directory stubs which need to be
ignored. I assumed a file based content repository but this should be expanded to handle URI's
as well
> I feel that the current FileListEntityProcessor is poorly named. It should be called
the dirWalkEntityProcessor or dirCrawlEntityProcessor or such. And this new EntityProcessor
should have the name FileListEntityProcessor. However what is done is done. I then came up
with manifestEnityProcessor which I thought suited, manifest files are all over the content
sets I deal with and the dictionary definition seemed close enough ("ships manifest"). However
how about ChangeListEntityProcessor
> {code}
>        <entity name="jc"
>                processor="ManifestEntityProcessor"
>                baseDir="/Volumes/Techmore/ts/aaa/schema/data"
>                rootEntity="false"
>                dataSource="null"
>                allowRegex="^.*\.xml$"
>                blockRegex="usc2009"
>                manifestFileName="/Volumes/ts/man-find.txt"
>                docAddRegex=".*"
>                >
> {code}
> The new entity fields are as follows.
>  
>    *manifestFileName* is the required location of the manifest file. If this value is
relative, it assumed to be relative to baseDir.
>    *allowRegex* is an optional attribute that if present discards any line which does
not match the regExp
>  
>    *blockRegex* is an optional attribute that is applied after any allowRegex and discards
any line which matches the regExp
>    *docAddRegex* is a required regex to identify lines which when matched should cause
docs to be added to the index. As well as matching the line it should also return the portion
of the line which contains the filepath as group(1)
>    *docDeleteRegex* is an optional value of a regex to identify documents which when
matched should be deleted from the index. As well as matching the line it should also return
the portion of the line which contains the filepath as group(1) **PLANNED**

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