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Plan-based Complex Event Detection across Distributed Sources

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Old 09-25-2008
Plan-based Complex Event Detection across Distributed Sources
Tim Bass
09-25-2008 09:49 AM
Here is an interesting 2008 paper, Plan-based Complex Event Detection across Distributed Sources.

Abstract
Complex Event Detection (CED) is emerging as a key capability for many monitoring applications such as intrusion detection, sensorbased activity & phenomena tracking, and network monitoring. Existing CED solutions commonly assume centralized availability and processing of all relevant events, and thus incur significant overhead in distributed settings. In this paper, we present and evaluate communication efficient techniques that can efficiently perform CED across distributed event sources.

Our techniques are plan-based: we generate multi-step event acquisition and processing plans that leverage temporal relationships among events and event occurrence statistics to minimize event transmission costs, while meeting application-specific latency expectations. We present an optimal but exponential-time dynamic programming algorithm and two polynomial-time heuristic algorithms, as well as their extensions for detecting multiple complex events with common sub-expressions. We characterize the behavior and performance of our solutions via extensive experimentation on synthetic and real-world data sets using our prototype implementation.

Source...
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LEARN ABOUT DEBIAN

event::rpc::connection

Event::RPC::Connection(3pm)				User Contributed Perl Documentation			       Event::RPC::Connection(3pm)

NAME

       Event::RPC::Connection - Represents a RPC connection

SYNOPSIS

       Note: you never create instances of this class in your own code, it's only used internally by Event::RPC::Server. But you may request
       connection objects using the connection_hook of Event::RPC::Server and then having some read access on them.

	 my $connection = Event::RPC::Server::Connection->new (
	     $rpc_server, $client_socket
	 );

       As well you can get the currently active connection from your Event::RPC::Server object:

	 my $server	= Event::RPC::Server->instance;
	 my $connection = $server->get_active_connection;

DESCRIPTION

       Objects of this class represents a connection from an Event::RPC::Client to an Event::RPC::Server instance. They live inside the server and
       the whole Client/Server protocol is implemented here.

READ ONLY ATTRIBUTES

       The following attributes may be read using the corresponding get_ATTRIBUTE accessors:

       cid The connection ID of this connection. A number which is unique for this server instance.

       server
	   The Event::RPC::Server instance this connection belongs to.

       is_authenticated
	   This boolean value reflects whether the connection is authenticated resp. whether the client passed correct credentials.

       auth_user
	   This is the name of the user who was authenticated successfully for this connection.

       client_oids
	   This is a hash reference of object id's which are in use by the client of this connection. Keys are the object ids, value is always 1.
	   You can get the corresponding objects by using the

	     $connection->get_client_object($oid)

	   method.

	   Don't change anything in this hash, in particular don't delete or add entries. Event::RPC does all the necessary garbage collection
	   transparently, no need to mess with that.

AUTHORS

	 Joern Reder <joern at zyn dot de>

COPYRIGHT AND LICENSE

       Copyright (C) 2002-2006 by Joern Reder, All Rights Reserved.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2008-10-25					       Event::RPC::Connection(3pm)