Hoss Man created SOLR-5108:
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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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