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2.5.4 WebSphere Commerce caching filter
Commerce provides a servlet cache filter to construct the cache ID from session information. The servlet cache filter sets up Http request attributes from stored session data. The DynaCache uses the request attributes as component elements in constructing the cache ID. The caching filter is not a part of DynaCache technology and its primary purpose is to enable WebSphere Commerce specific data to be processed by the DynaCache filter.
Technically, the "caching filter" extracts data variables from the HTTP session object and places them into the HTTP request prior to delivery to the DynaCache filter. Doing so allows these variables to be referenced in the cachespec and therefore used to augment the level of granularity for caching Commerce data objects.