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From "Bart Robeyns (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HTTPCLIENT-1099) Overriding Caching Policies
Date Tue, 07 Jun 2011 10:59:58 GMT

     [ https://issues.apache.org/jira/browse/HTTPCLIENT-1099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bart Robeyns updated HTTPCLIENT-1099:

    Attachment: OpenPolicies.patch

This patch allows to set the Policies on CacheConfig and makes the Policy-classes public.

> Overriding Caching Policies
> ---------------------------
>                 Key: HTTPCLIENT-1099
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1099
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: Cache
>    Affects Versions: 4.1.1
>            Reporter: Bart Robeyns
>            Priority: Minor
>              Labels: cache, policy
>         Attachments: OpenPolicies.patch
> It is not possible to alter the behaviour of the CachingHttpClient because the policies
defining the behaviour are private and tied directly to specific implementations in the CachingHttpClients
constructor. Furthermore, these policies are package private, discouraging reuse and/or extensions.
> Making this possible is easy enough (provide some policy-setters or -constructor-args
in CachingHttpClient and make the policy-classes public) - which leads me to believe that
the tight relationships between client and policies is deliberate. Is this the case, or are
you willing to accept a patch that opens up these classes for extending the caching behaviour?
> The specific case that lead to this question:
> A back-end application only sets its Content-Length header for responses below 8K. This
response does get stored in the cache, but when retrieving it from the cache, CacheValidityPolicy.contentLengthHeaderMatchesActualLength
checks the Content-Length header with the stored size (to verify whether the cached content
is complete). This check fails, causing the cache entry to be deemed unusable. If we were
able to provide our own subclassed CacheValidityPolicy, it would be easy to skip the check
if the header is missing and thus accomodate this specific back-end quirk.

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