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From "Jon Moore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1090) CachingHttpClient should be able to cache ResponseHandler responses (or the result of some new form of ResponseHandler)
Date Mon, 16 May 2011 14:37:47 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034033#comment-13034033
] 

Jon Moore commented on HTTPCLIENT-1090:
---------------------------------------

Actually, I'm inclined, but I think Oleg has a point about having time to do it. :)

That said, this is something I've been thinking about, and I think the rough approach David
outlined is probably right. I think roughly this is a caching layer on top of the CachingHttpClient
with a slightly different interface. I think the easiest approach is to have this layer cache
parsed object bodies along with origin response headers, then apply some of the same logic
from the guts of CachingHttpClient to determine whether the parsed object can be returned
as-is, or if revalidation is required. There's a bit of trickiness here, because I think maintaining
the semantic transparency of HTTP caching is important, and we'd want to make sure that cached
objects could be invalidated by POSTs to the appropriate URL, for example.


> CachingHttpClient should be able to cache ResponseHandler responses (or the result of
some new form of ResponseHandler)
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1090
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1090
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: HttpClient
>    Affects Versions: 4.1.1
>         Environment: Mac OS X 10.6.7 + Eclipse Helios SR2
>            Reporter: David Waite
>            Priority: Minor
>             Fix For: Future
>
>
> When creating a ResponseHandler to parse the response value into a usable java object,
I notice that the code is executed every time, even if the response object is served from
cache. It would be nice to have a system where a ResponseHandler can be written such that
its value is also served from cache. This may require a different interface which:
> - Exposes just the values which are not altered when served from a cache
> - Returns objects which can be cached out of process ( through documentation, and having
the return type extend Serializable)
> Alternatively, if there is a header uniquely identifying a response, a WeakHashMap could
be used to provide a cache associating a response with a created object (although such a cache
would not correlate to the HTTP cache in terms of retention)

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