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DEBS08(5) - Event-based Constraints

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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 SUNOS

dat_evd_post_se

dat_evd_post_se(3DAT)				     Direct Access Transport Library Functions				     dat_evd_post_se(3DAT)

NAME

       dat_evd_post_se - post Software event to the Event Dispatcher event queue

SYNOPSIS

       cc [ flag... ] file... -ldat [ library... ]
       #include <dat/udat.h>

       DAT_RETURN
	   dat_evd_post_se(
	   IN	     DAT_EVD_HANDLE    evd_handle,
	   IN const  DAT_EVENT	       *event
	   )

PARAMETERS

       evd_handle      Handle for an instance of the Event Dispatcher

       event	       A pointer to a Consumer created Software Event.

DESCRIPTION

       The  dat_evd_post_se()  function posts Software events to the Event Dispatcher event queue. This is analogous to event arrival on the Event
       Dispatcher software Event Stream. The event that the Consumer provides adheres to the event format as defined in <dat.h>. The first element
       in  the	event provides the type of the event (DAT_EVENT_TYPE_SOFTWARE); the rest provide the event-type-specific parameters. These parame-
       ters are opaque to a Provider. Allocation and release of the memory referenced by the event pointer in a software event are the	Consumer's
       responsibility.

       There  is no ordering between events from different Event Streams. All the synchronization issues between multiple Consumer contexts trying
       to post events to an Event Dispatcher instance simultaneously are left to a Consumer.

       If the event queue is full, the operation is completed unsuccessfully and returns DAT_QUEUE_FULL. The event is not queued. The queue  over-
       flow condition does takes place and, therefore, the asynchronous Event Dispatcher is not effected.

RETURN VALUES

       DAT_SUCCESS	       The operation was successful.

       DAT_INVALID_HANDLE      The evd_handle parameter is invalid.

       DAT_INVALID_PARAMETER   The event parameter is invalid.

       DAT_QUEUE_FULL	       The Event Dispatcher queue is full.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard: uDAPL, 1.1, 1.2    |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       libdat(3LIB), attributes(5)

SunOS 5.10							    16 Jul 2004 					     dat_evd_post_se(3DAT)