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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_enable

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

NAME

       dat_evd_enable - enable the Event Dispatcher

SYNOPSIS

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

       DAT_RETURN
	   dat_evd_enable(
	   IN	 DAT_EVD_HANDLE    evd_handle
	   )

PARAMETERS

       evd_handle    Handle for an instance of Event Dispatcher.

DESCRIPTION

       The dat_evd_enable() function enables the Event Dispatcher so that the arrival of an event can trigger the associated CNO. The enabling and
       disabling EVD has no effect on direct waiters on the EVD. However, direct waiters effectively take ownership of the EVD, so that the speci-
       fied CNO is not triggered even if is enabled.

       If the Event Dispatcher is already enabled, this operation is no-op.

RETURN VALUES

       DAT_SUCCESS	     The operation was successful.

       DAT_INVALID_HANDLE    The evd_handle parameter is invalid.

ATTRIBUTES

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

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

SEE ALSO

       dat_evd_disable(3DAT), libdat(3LIB), attributes(5)

SunOS 5.11							    16 Jul 2004 					      dat_evd_enable(3DAT)