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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_free

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

NAME

       dat_evd_free - destroy an instance of the Event Dispatcher

SYNOPSIS

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

       DAT_RETURN
	   dat_evd_free (
	   IN	 DAT_EVD_HANDLE    evd_handle
	   )

PARAMETERS

       evd_handle      Handle for an instance of the Event Dispatcher.

DESCRIPTION

       The dat_evd_free() function destroys a specified instance of the Event Dispatcher.

       All  events  on	the  queue  of the specified Event Dispatcher are lost. The destruction of the Event Dispatcher instance does not have any
       effect on any DAT Objects that originated an Event Stream that had fed events to the Event Dispatcher instance. There should  be  no  event
       streams feeding the Event Dispatcher and no threads blocked on the Event Dispatcher when the EVD is being closed as at the time when it was
       created.

       Use of the handle of the destroyed Event Dispatcher in any consequent operation fails.

RETURN VALUES

       DAT_SUCCESS	       The operation was successful.

       DAT_INVALID_HANDLE      The evd_handle parameter is invalid

       DAT_INVALID_STATE       Invalid parameter. There are Event Streams associated with the Event Dispatcher feeding it.

USAGE

       Consumers are advised to destroy all Objects that originate Event Streams that feed an instance of the Event Dispatcher	before	destroying
       it. An exception to this rule is Event Dispatchers of an IA.

       Freeing an IA automatically destroys all Objects associated with it directly and indirectly, including Event Dispatchers.

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_free(3DAT)