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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-5108) plugin loading should fail if mor then one instance of a singleton plugin is found
Date Thu, 01 Aug 2013 18:29:48 GMT
Hoss Man created SOLR-5108:
------------------------------

             Summary: plugin loading should fail if mor then one instance of a singleton plugin
is found
                 Key: SOLR-5108
                 URL: https://issues.apache.org/jira/browse/SOLR-5108
             Project: Solr
          Issue Type: Bug
            Reporter: Hoss Man
            Assignee: Hoss Man


Continuing from the config parsing/validation work done in SOLR-4953, we should improve SolrConfig
so that parsing fails if multiple instances of a "plugin" are found for types of plugins where
only one is allowed to be used at a time.

at the moment, {{SolrConfig.loadPluginInfo}} happily initializes a {{List<PluginInfo>}}
for whatever xpath it's given, and then later code can either call {{List<PluginInfo>
getPluginInfos(String)}} or {{PluginInfo getPluginInfo(String)}} (the later just being shorthand
for getting the first item in the list.

we could make {{getPluginInfo(String)}} throw an error if the list has multiple items, but
i think we should also change the signature of {{loadPluginInfo}} to be explicit about how
many instances we expect to find, so we can error earlier, and have a redundant check.



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