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Old 07-07-2008
DEBS08(5) - Event-based Constraints
vincent
Mon, 07 Jul 2008 12:41:24 +0000
Another paper at the Distributed Event Based Systems conference was on “Event Based Constraints for SensorNet Programming”. I had high hopes for an interesting paper on goal-driven CEP, but in fact the authors (from Brown University, USA) seemed to define “constraint” as a synonym of “filter” (as in “temporal, spatial, attribute-based or existential constraints on some event”). So there was no CLP-type relaxing of constraints during event processing to try and achieve some goal.
The paper did describe some an interesting approach to distributed CEP, using spatial and temporal event processing elements to divide up a high-datarate environment (detecting people being chased in a crowd). The main problem was, as always in distributed event processing (without a shared memory bus), ensuring that all possible event correlations can take place (with the right event being in the right processor at the right time). Probably for some sensor processing, though, a 100% success rate is not a requirement (i.e. if someone runs across an “event process boundary”, they will be presumably be picked up by the next event processor at some point).
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LEARN ABOUT DEBIAN

data::formvalidator::constraints::dates

Data::FormValidator::Constraints::Dates(3pm)		User Contributed Perl Documentation	      Data::FormValidator::Constraints::Dates(3pm)

NAME

       Data::FormValidator::Constraints::Dates - Validate Dates and Times

SYNOPSIS

	   use Data::FormValidator::Constraints::Dates qw(date_and_time);

	   # In a DFV profile...
	   constraint_methods => {
	       # 'pp' denotes AM|PM for 12 hour representation
	       my_time_field => date_and_time('MM/DD/YYYY hh:mm:ss pp'),
	   }

DESCRIPTION

   date_and_time
       Note: This is a new module is a new addition to Data::FormValidator and is should be considered "Beta".

       This constraint creates a regular expression based on the format string passed in to validate your date against. It understands the
       following symbols:

	   Y   year  (numeric)
	   M   month (numeric)
	   D   day   (numeric)
	   h   hour
	   m   minute
	   s   second
	   p   AM|PM

       Other parts of the string become part of the regular expression, so you can do perlish things like this to create more complex expressions:

	   'MM?/DD?/YYYY|YYYY-MM?-DD?'

       Internally Date::Calc is used to test the functions.

BACKWARDS COMPATIBILITY

       This older, more awkward interface is supported:

	   # In a Data::FormValidator Profile:
	   validator_packages => [qw(Data::FormValidator::Constraints::Dates)],
	   constraints => {
	       date_and_time_field	 => {
		   constraint_method => 'date_and_time',
		   params=>['MM/DD/YYYY hh:mm:ss pp'], # 'pp' denotes AM|PM for 12 hour representation
	       },
	   }

SEE ALSO

       o   Data::FormValidator

       o   Data::FormValidator::Constraints::DateTime  - This alternative features returning dates as DateTime objects and validating against the
	   date formats required for the MySQL and PostgreSQL databases.

AUTHOR

       Mark Stosberg, <mark@summersault.com>

       Featuring clever code by Jan Krynicky.

COPYRIGHT AND LICENSE

       Copyright 2003-2005 by Mark Stosberg

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2011-11-25			      Data::FormValidator::Constraints::Dates(3pm)