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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1725) Script based UpdateRequestProcessorFactory
Date Mon, 06 Aug 2012 21:35:03 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429458#comment-13429458
] 

Uwe Schindler commented on SOLR-1725:
-------------------------------------

I think, this is all fine:
- Java 6 spec requires a JavaScript engine to be shipped with JDK, it is just missing at FreeBSD's
package (there is an issue open upstream). If JavaScript is not there for Java 6 it is like
missing UTF8 charset :-)
- I strongly -1 shipping with additional scripting engines. No need for that. If user Foo
wants to script Solr with engine Bar, he can add the SPI Jar to classpath. No need to ship.
This is why SPI was invented!

We should maybe only fix Solr's classloader to be set as context classloader, too. SPIs cannot
be loaded from $SOLR_HOME/lib, because context classloader does not see the jars. We fixed
that for codecs and analyzer SPI JARs in Solr, but the most correct solution would be to enable
Solr's threads to see the ResourceLoader as context classloader. Then you can add scripting
engines, XML parsers, charset providers, locales,... just like plugins or codecs or analyzerfactories
into the Solr home's lib folder without adding to WAR.
                
> Script based UpdateRequestProcessorFactory
> ------------------------------------------
>
>                 Key: SOLR-1725
>                 URL: https://issues.apache.org/jira/browse/SOLR-1725
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>    Affects Versions: 1.4
>            Reporter: Uri Boness
>            Priority: Critical
>              Labels: UpdateProcessor
>             Fix For: 4.0
>
>         Attachments: SOLR-1725-rev1.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch,
SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch,
SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch
>
>
> A script based UpdateRequestProcessorFactory (Uses JDK6 script engine support). The main
goal of this plugin is to be able to configure/write update processors without the need to
write and package Java code.
> The update request processor factory enables writing update processors in scripts located
in {{solr.solr.home}} directory. The functory accepts one (mandatory) configuration parameter
named {{scripts}} which accepts a comma-separated list of file names. It will look for these
files under the {{conf}} directory in solr home. When multiple scripts are defined, their
execution order is defined by the lexicographical order of the script file name (so {{scriptA.js}}
will be executed before {{scriptB.js}}).
> The script language is resolved based on the script file extension (that is, a *.js files
will be treated as a JavaScript script), therefore an extension is mandatory.
> Each script file is expected to have one or more methods with the same signature as the
methods in the {{UpdateRequestProcessor}} interface. It is *not* required to define all methods,
only those hat are required by the processing logic.
> The following variables are define as global variables for each script:
>  * {{req}} - The SolrQueryRequest
>  * {{rsp}}- The SolrQueryResponse
>  * {{logger}} - A logger that can be used for logging purposes in the script

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