>> If you are hoping to resume inline, you could simulate it with
>> something like: [...]
> This would still require a fancy session manager that could figure
> out which request exactly to serve and how to clean up unused
> requests...
That's not too hard, though. Just drop a cookie with a session_id (in
unpredictable one, and maybe an IP address/user-agent, to prevent the
most egregious session highjacking), and check the cookie when the
next request comes in. That session presumably now has a function
attached to it to call to get the next result in the chain.
Since a number of nested session-setups could get ugly:
session_manager:new(...
session_manager:new(...
(especially since they'd have to be lexically in reverse-order to the
actual execution order), you might want to set up some simple data-
structure for chaining them:
task:new([fun say_hello/2,
fun ask_how_are_you/2,
fun say_fine_thanks_and_ask_about_weather/2,
| ... ]).
(such that each is defined to, for instance, take the list of
parameters "so far" and return an {{ewc},NewParams})
If you plan to get really busy, you'll need a hash function that takes
some relatively (not necessarily perfectly) unique value (IP/User-
agent?) and maps that to a given session_manager or node, so that you
can have multiple session_managers on several nodes, for ease of load-
balancing.
Cleaning up unused requests without blocking is a little trickier, but
you could just, every N requests or minutes, spawn a process, passing
it a list of
[{session_id,last_used_date} |...], then have it send back to the
session_manager a number of session_manager:delete(Session_id) casts
as appropriate, so that the 'delete's and actual session requests can
be interleaved rather than totally blocking the session_manager.
It's at least conceptually solid, I think :)
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