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A nutch-plugin is an container for a set of custom logic that provide
extensions to the nutch core functionality or another plugin that provides an
API for extending. A plugin can provide one or a set of extensions.
Extensions are components that can be dynamically installed as a kind of
listener to extension points. Extension points are a kind of publisher that
provide a API and invoke one or a set of installed extensions.
Each plugin may extend the base Plugin. Plugin
instances are used as the point of life cycle managemet of plugin related
The Plugin will be startuped and shutdown by the nutch plugin
A possible usecase of the Plugin implementation is to create
or close a database connection.