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From "Dennis Kubes (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-609) Allow Plugins to be Loaded from Jar File(s)
Date Sat, 09 Feb 2008 19:55:11 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567349#action_12567349
] 

Dennis Kubes commented on NUTCH-609:
------------------------------------

It may be able to, I will look into it.  I am still in the early stages of this but have gotten
it to unzip jars and load the plugins.  One thing I am seeing is that the actual resources
need to be around after the initial parse because the resources are lazily loaded. :)

> Allow Plugins to be Loaded from Jar File(s)
> -------------------------------------------
>
>                 Key: NUTCH-609
>                 URL: https://issues.apache.org/jira/browse/NUTCH-609
>             Project: Nutch
>          Issue Type: Improvement
>    Affects Versions: 1.0.0
>         Environment: All
>            Reporter: Dennis Kubes
>            Assignee: Dennis Kubes
>             Fix For: 1.0.0
>
>
> Currently plugins cannot be loaded from a jar file.  Plugins must be unzipped in one
or more directories specified by the plugin.folders config.  I have been thinking about an
extension to PluginRepository or PluginManifestParser (or both) that would allow plugins to
packaged into multiple independent jar files and placed on the classpath.  The system would
search the classpath for resources with the correct folder name and would load any plugins
in those jars.
> This functionality would be very useful in making the nutch core more flexible in terms
of packaging.  It would also help with web applications where we don't want to have a plugins
directory included in the webapp.
> Thoughts so far are unzipping those plugin jars into a common temp directory before loading.
 Another option is using something like commons vfs to interact with the jar files.  VFS essential
uses a disk based temporary cache for jar files, so it is pretty much the same solution. 
 What are everyone else's thoughts on this?

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