Documentation sake : I have solved the problem by extending StreamableResourceSourceImpl with my local class and binding that class with a local interface with the same methods as StreamableResourceSource, hence avoiding the decorators bound to StreamableResourceSource.
I feel that this is a very bad solution, but it was just simpler than if i wrote it servlet style. I think StreamableResourceSource itself should be a plpeline into which a user could contribute and override existing instances. Also i could be completely wrong :) Regards. On Wed, Apr 17, 2013 at 7:24 PM, Nenad Nikolic <iznenad.niko...@gmail.com>wrote: > Thank you for the quick response! I was considering such an approach, > implementing a separate dispatcher at first but figured it would just be > too much work and tapestry already provides the features and infrastructure > i need for delivering assets. I seems that i wasn't looking at the problem > i need to solve good enough. > > But still, if it would be possible to somehow override the > SRSCachingInterceptor's implementation of isCachable i think i would > actually have a valid solution. > I could have a special handling for the resources with the custom > extension and just not cache them. > > Is it possible to do this? Am i missing something in thinking this? > > Thanks again. > > > > On Wed, Apr 17, 2013 at 7:05 PM, Howard Lewis Ship <hls...@gmail.com>wrote: > >> Generally speaking, assets are expected to be static (that is, unchanging) >> and global, which is why there's so much caching going on. >> >> I would say that you should implement your own Dispatcher (contributed to >> the MasterDispatcher) service and just take control of this, using the >> same >> techniques you might use to server content out of a database. It ends up >> being more like a servlet at that point (Dispatcher is very similar to >> HttpServlet) and you have control over everything that happens: you >> control >> the cache, the URL format, the works. With a little bit of effort, you >> can >> probably leverage some of the features of Tapestry's asset pipeline >> (minimization, CSS rewriting in 5.4, etc.), by making your data implement >> StreamableResource. >> >> >> On Wed, Apr 17, 2013 at 5:33 PM, Nenad Nikolic <iznenad.niko...@gmail.com >> >wrote: >> >> > Hello, i'm struggling with delivering a transformed resource for each >> > request. >> > >> > Here is exactly what i mean: >> > >> > There are two requests expected to hit the app. >> > 1) a request containing a unique identifier and some other values as >> > request parameters. >> > This request will hit a dispatcher which will store the data into >> > hazelcast, and render a response which will contain urls to two assets >> (one >> > js one css) with a request parameter (the unique identifier). >> > Here is how an example response looks like: >> > >> > <modifier> >> > <javascript> >> > <filepath> >> > >> > >> http://localhost:8080/app/assets/1.0.0-SNAPSHOT/ccdd/template.nmjs?trid=unique_identifier >> > </filepath> >> > </javascript> >> > <css> >> > <filepath> >> > >> > >> http://localhost:8080/app/assets/1.0.0-SNAPSHOT/ccdd/template.nmcss?trid=unique_identifier >> > </filepath> >> > </css> >> > </modifier> >> > >> > This is a machine-to-machine request. The system that made the request >> will >> > give the asset urls to the client when rendering a webpage. >> > >> > 2) the second request is the one coming from the client. It is a request >> > for the actuall assets. It should return the asset but replace the >> > placeholders within the asset with values from hazelcast. >> > I currently have an AssetHandler mapped to the "ccdd" path. >> > In the AssetHandler i get the request parameter and get the values from >> the >> > hazelcast map. Then the values are stored on the environment stack for >> my >> > ResourceTransformer to access. This whole thing is working and i get a >> > properly transformed asset for the first request. >> > >> > My problem is that when the unique identifier changes the resource is >> not >> > transformed again. >> > >> > So my questions are: >> > >> > Is it possible to cache resources selectively? >> > Am i doing this in a completely shitty way? >> > >> > I hope that my explanation is understandable. Thx in advance for any >> > responses! >> > >> >> >> >> -- >> Howard M. Lewis Ship >> >> Creator of Apache Tapestry >> >> The source for Tapestry training, mentoring and support. Contact me to >> learn how I can get you up and productive in Tapestry fast! >> >> (971) 678-5210 >> http://howardlewisship.com >> > >
