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Plugin system for Twisted.
@author: Jp Calderone
@author: Glyph Lefkowitz
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Determine which 'pickle' API module to use.
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Interface that must be implemented by all plugins.
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A collection of L{CachedPlugin} instances from a particular module in a
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@ivar description: A brief explanation of this collection of plugins
(probably the plugin module's docstring).
@type plugins: C{list}
@ivar plugins: The L{CachedPlugin} instances which were loaded from this
dropin.
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Compute all the possible loadable plugins, while loading as few as
possible and hitting the filesystem as little as possible.
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for plugins.
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Retrieve all plugins implementing the given interface beneath the given module.
@param interface: An interface class. Only plugins which implement this
interface will be returned.
@param package: A package beneath which plugins are installed. For
most uses, the default value is correct.
@return: An iterator of plugins.
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Return a list of additional directories which should be searched for
modules to be included as part of the named plugin package.
@type name: C{str}
@param name: The fully-qualified Python name of a plugin package, eg
C{'twisted.plugins'}.
@rtype: C{list} of C{str}
@return: The absolute paths to other directories which may contain plugin
modules for the named plugin package.
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