Nicola Ken Barozzi wrote:
Berin Loritsch wrote:
For instance, part of the issue resides in the fact that any client
(i.e. CLI environment or Servlet) can only access one view at a time
for any resource.
Why not allow a client to access all views to a resource that it
needs/wants simultaneously? That will allow things like the all
important profiling information to be appended after HTML pages
are rendered.
I thought of this too. But in practice?...
Cocoon is so entrenched in the single path of execution mentality that
environments that need the extra complexity can't have it.
Each resource should only need to be rendered once, and only
once. Each view to the resource should be accessible by a client.
FOr instance, the CLI client wants the Link/Mime-Type information
and the content itself. The Link/Mime-Type information is accessed
via the LinkSamplingEnvironment. In reality, that is a poor name
for what you are really wanting to represent. It should be the
LinkSamplingView. That view caches information that can be incorporated
back into the list of links we are resolving.
Ok, but in practice, how does the client request the view results?
I kinda like this non-blocking view concept, but fail to see clearly the
practical implementation.
I think this gets back to the whole Multi-Path pipelining thread a while
back (i.e. allowing the multiplexing of a pipeline to serialize results
to the disk while sending the results to the user at the same time.
In the end, I don't think that "Views" as they are defined currently are
what we are really after. What we want is a way of siphening
information from our pipeline so that we can use it as we see fit.
As such, what we really need is something like a "publish/subscribe"
mechanism similar to the way Avalon Instrument works. I.e. if we don't
need it, we don't waste precious resources--but if we do need it, then
it is available to us.
I am not sure of the mechanism, but perhaps we can butt our heads
together to come up with the best solution.
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