RE: Custom Pipeline Caching

[Ard Schrijvers]

The specific thing you describe you want to implement is not possible. But, there are options to improve on some points, but it really depends on a few things (especially getting the external content):   I will try to summarize some of your options here:   1) How up to date should the external content be? Can you say, it is valid for at least 5 minutes? Then, use the expiring cche of cocoon 2) Can you get a timestamp of the external content (just like on filesystem, a lastmodified)? Then, normal cocoon cache should work. Only disadvantage, is that for checking the validity of your cached pipeline, a call to the external resource is made for something like a timestamp. 3) This is by far the nicest solution, but probably not useable for you: if you have external calls to for example a repository, eventCaching is the way to go, where for example after changes, jms messages invalidate the corresponding pipelines. But, probably, you just read external content which is not yours.   These are your options I think.   If you want to understand more about the cocoon caching mechanism, and how cocoon checks for cached pipelines (especially what the order of checks are, like cache keys and validity objects), check out: http://cocoon.zones.apache.org/daisy/documentation/writing/690.html   Regards Ard -- Hippo Oosteinde 11 1017WT Amsterdam The Netherlands Tel  +31 (0)20 5224466 ------------------------------------------------------------- [EMAIL PROTECTED] / http://www.hippo.nl --------------------------------------------------------------        Hello Antonio, I am not sure whether I can use the ExpiresCachingPipeline because I am implementing a kind of Proxy, so I have to make sure the content is up2date. To explain it better, here a simple description of the pipeline: 1. Transformations (Preparation) 2. Fetching of external content 3. Transformation After having fetched the content, I can decide if it changed or not, so I could skip step 3. I can't cache step 2 as I can never be sure that the external content did not change... How can I implement a cache mechanism for my special case? Hi Nils, This thread may help you [1] Best Regards, Antonio Gallardo [1] http://marc.theaimsgroup.com/?t=114071517900001 Nils Kaiser escribió: Hello, I have a complex pipeline which contains some self written components that generate and transform data in steps that cannot really be cached (dependent on external resources like the result of a request...). What are the possibilities to implement a custom cachin scheme? Is there a way to define a step in the pipeline where caching is possible again (not just if all preceding components are cache-aware?). Greetings, Nils --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]