make EventListener an interface
-------------------------------
Key: SOLR-1081
URL: https://issues.apache.org/jira/browse/SOLR-1081
Project: Solr
Issue Type: Improvement
Components: contrib - DataImportHandler
Reporter: Noble Paul
Priority: Minor
Fix For: 1.4
It is possible that a Transformer/EntityProcessor would wish to act as an
EventListener. As an abstract class it is not possible
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