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The following page has been changed by JakeVanderdray: http://wiki.apache.org/nutch/WritingPlugins ------------------------------------------------------------------------------ Nutch's plugin system is based on the one used in Eclipse 2.x. Plugins are central to how nutch works. All of the parsing, indexing and searching that nutch does is actually accomplished by various plugins. - In writing a plugin, you're actually providing one or more ''extensions'' of the existing ''extension-points'' . The core Nutch ''extension-points'' are themselves defined in a plugin, the [http://lucene.apache.org/nutch/apidocs/org/apache/nutch/plugin/ExtensionPoint.html NutchExtensionPoints] plugin (they are listed in the !NutchExtensionPoints [http://svn.apache.org/viewcvs.cgi/lucene/nutch/trunk/src/plugin/nutch-extensionpoints/plugin.xml?view=markup plugin.xml] file). Each ''extension-point'' define an interface that must be implemented by the ''extension''. The core extension points are: + In writing a plugin, you're actually providing one or more ''extensions'' of the existing ''extension-points'' . The core Nutch ''extension-points'' are themselves defined in a plugin, the [http://lucene.apache.org/nutch/apidocs/org/apache/nutch/plugin/ExtensionPoint.html NutchExtensionPoints] plugin (they are listed in the !NutchExtensionPoints [http://svn.apache.org/viewcvs.cgi/lucene/nutch/trunk/src/plugin/nutch-extensionpoints/plugin.xml?view=markup plugin.xml] file). Each ''extension-point'' defines an interface that must be implemented by the ''extension''. The core extension points are: * [http://lucene.apache.org/nutch/apidocs/org/apache/nutch/clustering/OnlineClusterer.html OnlineClusterer] -- An extension point interface for online search results clustering algorithms (from javadoc). * [http://lucene.apache.org/nutch/apidocs/org/apache/nutch/indexer/IndexingFilter.html IndexingFilter] -- Permits one to add metadata to the indexed fields. All plugins found which implement this extension point are run sequentially on the parse (from javadoc).
