Metadata-Version: 1.0
Name: Products.PageCacheManager
Version: 1.2
Summary: Cache rendered pages including headers
Home-page: http://svn.plone.org/svn/collective/Products.PageCacheManager
Author: Geoff Davis
Author-email: geoff@geoffdavis.net
License: ZPL
Description: Introduction
        ============
        
        PageCacheManager is designed to speed up access to content views while
        at the same time making sure that stale content is not served up.
        
        Installation
        ============
        
        PageCacheManager is designed specifically for caching views of content
        objects. Unlike RAMCacheManager, PageCacheManager caches both the
        html generated by a view as well as the HTTP headers.
        
        PageCacheManager builds upon Zope's standard cache manager machinery.
        As with RAMCacheManager, you associate some page templates with the cache
        manager and configure the properties.  PageCacheManager requires an
        extra step: content to be cached must generate an ETag via a caching
        policy.  PageCacheManager looks for a CachingPolicyManager with id
        caching_policy_manager.  If it finds it, it then gets an ETag for the
        current template + content object combination.  This ETag is then used
        as the index into the cache.  If you don't have an ETag generated for
        your content, your pages will not be cached.
        
        If you create an ETag that changes when the content is changed, then
        the content served up by the cache will stay fresh.  There will be a
        cache miss the first time the page is hit after the ETag changes, then
        subsequent hits to the newly modified content view will reflect the new
        version.  If your content view is personalized, you will want your ETag
        to vary depending on the current user.  A good ETag with these properties
        is as follows:
        
        ETag = id of currently authenticated user + delimiter + last modified time
        for content + delimiter + current time rounded to the nearest hour
        
        The use of the id in the ETag means that every user's view of a content
        object will have a different ETag, so everybody will get different
        cached objects.  The use of the modification time means that every time
        the content object changes, it will generate different ETags and hence
        will result in new copies being pulled from the cache.  The use of
        the current time rounded to the nearest hour means that nothing will be
        served up by the cache for more than an hour.
        
        Added bonus: PageCacheManager handles conditional GETs.  If the incoming
        request has an If-Modified-Since header with an ETag that matches the
        content object's current ETag, PageCacheManager will set a status 304
        header (Not Modified) and will return no content.
        
        
        Changelog
        =========
        
        1.2 - 2008-01-16
        ----------------
        
        - Repackage PageCacheManager is a python egg.
        [wichert]
        
        
Keywords: caching zope CMF
Platform: UNKNOWN
Classifier: Framework :: Plone
Classifier: Programming Language :: Python
Classifier: Topic :: Software Development :: Libraries :: Python Modules
