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https://issues.apache.org/jira/browse/SOLR-269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510749
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Yonik Seeley commented on SOLR-269:
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> I'm not sure we need to have XML configuration for this
If we have those multiple update processor factories, I agree we don't need XML
config for the transformers.
> I need a custom UpdateRequestProcessor that checks all the requests before
> executing any of them. I plan to store the valid commands in a list and only
> execute them in the finish() call. I'm not sure how to map that plan to an
> chain. How would I pass the output from one processor to the next?
I had thought of that use-case too (bulk operations), which is why I added
explicit flow contol (explicit calling of next.handleAdd() in the processor).
You can buffer up all the requests (you want to clone the UpdateCommands as
they might be reused though) and not call "next".
Then in finish, you can delegate all of the buffered commands.
> UpdateRequestProcessorFactory - process requests before submitting them
> -----------------------------------------------------------------------
>
> Key: SOLR-269
> URL: https://issues.apache.org/jira/browse/SOLR-269
> Project: Solr
> Issue Type: New Feature
> Reporter: Ryan McKinley
> Assignee: Ryan McKinley
> Fix For: 1.3
>
> Attachments: SOLR-269-UpdateRequestProcessorFactory.patch,
> SOLR-269-UpdateRequestProcessorFactory.patch, UpdateProcessor.patch
>
>
> A simple UpdateRequestProcessor was added to a bloated SOLR-133 commit.
> An UpdateRequestProcessor lets clients plug in logic after a document has
> been parsed and before it has been 'updated' with the index. This is a good
> place to add custom logic for:
> * transforming the document fields
> * fine grained authorization (can user X updated document Y?)
> * allow update, but not delete (by query?)
> <requestHandler name="/update" class="solr.StaxUpdateRequestHandler" >
> <str
> name="update.processor.class">org.apache.solr.handler.UpdateRequestProcessor</str>
> <lst name="update.processor.args">
> ... (optionally pass in arguments to the factory init method) ...
> </lst>
> </requestHandler>
> http://www.nabble.com/Re%3A-svn-commit%3A-r547495---in--lucene-solr-trunk%3A-example-solr-conf-solrconfig.xml-src-java-org-apache-solr-handler-StaxUpdateRequestHandler.java-src-java-org-apache-solr-handler-UpdateRequestProcessor.jav-tf3950072.html#a11206583
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