[Seaside] ANN: Continuations and Exceptions - time outs
brent at zamail.co.za
Tue Aug 12 21:12:26 UTC 2008
The attached change set adds Continuation >> #signal: that allows a Continuation to resume with a signalled Exception.
The change set also includes two new test cases.
This functionality will allow, inter alia, an external watchdog process to select old continuations and resume them
with a TimedOut exception. This is analagous to the existing #valueWithin:onTimeout:
Try this example (included in the change set preamble):
"create a place to store a continuation..."
Smalltalk at: #CC put: nil.
Transcript open; clear.
"fork a process that suspends on its continuation..."
[ [ Transcript show: 'about to suspend...'; cr.
Continuation currentDo: [ :cc | CC := cc. Processor activeProcess terminate ].
Transcript show: 'resumed in time'; cr ]
do: [ :e | Transcript show: e; cr ] ] fork.
[ CC value ] fork.
"resume with exception..."
[ CC signal: TimedOut ] fork.
"remove the continuation..."
CC := nil.
I think this could really help cleanup how Seaside expires sessions.
Thoughts, inclusion ?
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