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Plan-based Complex Event Detection across Distributed Sources

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Old 09-25-2008
Plan-based Complex Event Detection across Distributed Sources
Tim Bass
09-25-2008 09:49 AM
Here is an interesting 2008 paper, Plan-based Complex Event Detection across Distributed Sources.

Abstract
Complex Event Detection (CED) is emerging as a key capability for many monitoring applications such as intrusion detection, sensorbased activity & phenomena tracking, and network monitoring. Existing CED solutions commonly assume centralized availability and processing of all relevant events, and thus incur significant overhead in distributed settings. In this paper, we present and evaluate communication efficient techniques that can efficiently perform CED across distributed event sources.

Our techniques are plan-based: we generate multi-step event acquisition and processing plans that leverage temporal relationships among events and event occurrence statistics to minimize event transmission costs, while meeting application-specific latency expectations. We present an optimal but exponential-time dynamic programming algorithm and two polynomial-time heuristic algorithms, as well as their extensions for detecting multiple complex events with common sub-expressions. We characterize the behavior and performance of our solutions via extensive experimentation on synthetic and real-world data sets using our prototype implementation.

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LEARN ABOUT SUSE

sdl::event

SDL::Event(3)						User Contributed Perl Documentation					     SDL::Event(3)

NAME

       SDL::Event - a SDL perl extension

SYNOPSIS

	use SDL::Event;
	my $event = new SDL::Event;		# create a new event
	$event->pump(); 			# pump all events from SDL Event Queue
	$event->poll(); 			# Get the top one from the queue
	while ($event->wait()) {
	       my $type = $event->type();      # get event type
	       # ... handle event
	       exit if $type == SDL_QUIT;
	}

DESCRIPTION

       "SDL::Event" offers an object-oriented approach to SDL events. By creating an instance of SDL::Event via new() you can wait for events, and
       then determine the type of the event and take an appropriate action.

EXAMPLE

       Here is an example of a simple event handler loop routine.  See also SDL::App::loop.

	      sub loop {
		      my ($self,$href) = @_;
		      my $event = new SDL::Event;
		      while ( $event->wait() ) {
			      # ... insert here your event handling like:
			      if ( ref($$href{$event->type()}) eq "CODE" ) {
				      &{$$href{$event->type()}}($event);
				      $self->sync();
			      }
		      }
	      }

METHODS

   new()
       Create a new event object.

   type()
       Returns the type of the event, see list of exported symbols for which are available.

   pump()
   poll()
   wait()
       Waits for an event end returns then. Always returns true.

   set( type, state )
       Set the state for all events of the given event's type

   set_unicode( toggle )
       Toggle unicode on the event.

   set_key_repeat( delay, interval)
       Sets the delay and intervall of the key repeat rate (e.g. when a user holds down a key on the keyboard).

   active_gain()
   active_state()
   key_state()
   key_sym()
   key_name()
   key_mod()
   key_unicode()
   key_scancode()
   motion_state()
   motion_x()
       Returns the motion of the mouse in X direction as an absolute value.

   motion_y()
       Returns the motion of the mouse in Y direction as an absolute value.

   motion_xrel()
       Returns the motion of the mouse in X direction as a relative value.

   motion_yrel()
       Returns the motion of the mouse in Y direction as a relative value.

   button_state()
       Returns the state of the mouse buttons.

   button_x()
   button_y()
   button()
AUTHOR

       David J. Goehrig Documentation by Tels <http://bloodgate.com/>

SEE ALSO

       perl SDL::App

perl v5.12.1							    2010-07-05							     SDL::Event(3)