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A Short History of Complex Event Processing Part 3: the formative years

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Special Forums News, Links, Events and Announcements Complex Event Processing RSS News A Short History of Complex Event Processing Part 3: the formative years
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Old 12-18-2008
A Short History of Complex Event Processing Part 3: the formative years
by David LuckhamIn “A Short History, Part 2″ we left off our story of CEP at a period of “hard times” for the vendors of CEP products during the years 2000 to 2007. This was the first of the four stages of Complex Event Processing.* It was the take-off stage for CEP.* Figure 1 in [...]

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event::generic

Event::generic(3pm)					User Contributed Perl Documentation				       Event::generic(3pm)

NAME

       Event::generic - generic event handling

SYNOPSIS

	use Event::generic;

	$source = Event::generic::Source->new;

	$w = Event->generic(source => $source, ...);
	$w = $source->watch(...);

	$source = $w->source;
	$w->source($source);

	$source->event;
	$source->event($data);

	$data = $event->data;

DESCRIPTION

       This module provides a watcher type within the "Event" framework.  You must understand the architecture of the "Event" system in order to
       understand this document.

       This module provides a system of reified event sources and watchers watching those sources.  Events are generated solely by a method on the
       event source object.  The events may carry arbitrary data to the event handler callbacks.  This module is intended for situations where the
       events of interest are best determined by Perl code.

CLASSES

       Event::generic::Source
	   A reified event source.

       Event::generic
	   A watcher that can watch "Event::generic::Source" event sources.

       Event::Event::Dataful
	   A (target) event that can carry arbitrary data.

EVENT SOURCE CLASS

   Constructor
       Event::generic::Source->new
	   Creates and returns a new event source.

   Methods
       $source->event
       $source->event(DATA)
	   The invocation of this method is a source event for watchers of the event source.  When this method is called, each active watcher of
	   the event source generates a target event.  The DATA, if supplied, is copied into the target event objects, from which it can be
	   retrieved using the "data()" method.

       $source->watch(ATTR => VALUE, ...)
	   Generates and returns a new watcher, configured to watch this event source.	The standard watcher attributes may be specified as
	   arguments.  The watcher returned is an ordinary "Event::generic", and may be reconfigured to watch a different event source.

WATCHER CLASS

   Type-specific attributes
       source => $source
	   The event source to watch.  This must be either an "Event::generic::Source" object or "undef".  When set to "undef", no source is being
	   watched, and the watcher cannot be started.

EVENT CLASS

   Type-specific methods
       $event->data
	   Returns the data associated with the event, which may be any scalar.  This is read-only, and is set by the event source.

SEE ALSO

       Event

perl v5.14.2							    2007-05-22						       Event::generic(3pm)