Class CachedDirectory<SubDirectoryParamsT>Abstract

This implements a directory folder whose content is cached and only updated when needed.

This cache takes its input values from an iterator over data stored in a channel.

This class takes care of those things:

• cache the values that the iterator returns, so that the iterator only has to run when values are outdated
• Build the EasyDirectoryContent that represents the cached iterator values as directories (createDirectory)
• Forward the content of the sub-folders to other directory implementations (setSubDirectory)

The sub-classes that use this abstract class have to do the following:

• provide the directory content as iterator (by implementing the valueIterator)
• define the parameters that shall be forwarded to the next folder level (by setting the SubDirectoryParamsT parameter)
• define how to convert from the cached/iterator value to the parameters that shall be forwarded to the next folder level (by implementing the transformCacheValueToSubDirectoryParams)