Slight change to flow
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat Jun 17 23:36:27 CEST 2006
I have thought about and refined the flow diagram.
The main change is that instead of one "vcl_lookup" function there
are now a "vcl_hit" and a "vcl_miss" function depending
on the outcome of the lookup.
The reasons for this change is to avoid having to handle some really
silly corner cases like having a hit and then ordering a fetch
instead of a pass etc.
Since we have the "lookup" recursion possibility, anything that
could be done before can be done afterwards too, but without the
risk of an object pileup on any given URL.
Minor changes to the graphs include bold lines for the normal flow,
annotation of which variables can be accessed in the VCL code.
On the "complete implementation graph" I have added the "recursive"
path where VCL code sends us back to lookup (dotted lines) and put
the "busy object" path in a subgraph/box of its own.
Dot(1) isn't very good for making this look simple, manual
placement will make it much more readable.
As always: comments and suggestions are most welcome.
Poul-Henning
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`
end
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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