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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 OPENSOLARIS

dat_evd_resize

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

NAME

       dat_evd_resize - modify the size of the event queue of Event Dispatcher

SYNOPSIS

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

       DAT_RETURN
	   dat_evd_resize(
	   IN	 DAT_EVD_HANDLE    evd_handle,
	   IN	 DAT_COUNT	   evd_min_qlen
	   )

PARAMETERS

       evd_handle      Handle for an instance of Event Dispatcher.

       evd_min_qlen    New number of events the Event Dispatcher event queue must hold.

DESCRIPTION

       The dat_evd_resize() function modifies the size of the event queue of Event Dispatcher.

       Resizing  of  Event  Dispatcher event queue should not cause any incoming or current events on the event queue to be lost. If the number of
       entries on the event queue is larger then the requested evd_min_qlen, the operation can return DAT_INVALID_STATE and not change an instance
       of Event Dispatcher

RETURN VALUES

       DAT_SUCCESS		     The operation was successful.

       DAT_INVALID_HANDLE	     The evd_handle parameter is invalid.

       DAT_INVALID_PARAMETER	     The evd_min_qlen parameter is invalid

       DAT_INSUFFICIENT_RESOURCES    The operation failed due to resource limitations

       DAT_INVALID_STATE	     Invalid  parameter.  The  number  of entries on the event queue of the Event Dispatcher exceeds the requested
				     event queue length.

USAGE

       This operation is useful when the potential number of events that could be placed on the event queue changes dynamically.

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 5.11							    16 Jul 2004 					      dat_evd_resize(3DAT)