CEP is to Architecture as SOA is to Architecture Post: 302218576

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Special Forums News, Links, Events and Announcements Complex Event Processing RSS News CEP is to Architecture as SOA is to Architecture Post 302218576 by Linux Bot on Friday 25th of July 2008 03:10:05 PM

07-25-2008

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CEP is to Architecture as SOA is to Architecture

Tim Bass
07-25-2008 11:38 AM
I am often asked pointed questions (mostly from the stream processing crowd) like, ” What product does CEP?”* Sometime it seems my answer determines the fate of that relationship, as my feet are grilled over the CEP-fire to be beat of jungle drums!* The amount of money I have lost in deals that did not go through because I refused to sprinkle holy water on a vendor’s product and call it “CEP” is staggering, quite frankly.

CEP describes an architecture, just like SOA describes an architecture and just like EDA describes an architecture.

For example, you do not buy an SOA. * An SOA describes an architectural style of programming via components that are involved as services in a distributed network architecture - a service-oriented, or service-based architecture.

The concept of CEP does not have “the A-word” like SOA and EDA, but none-the-less, CEP describes an architecture, not a product.** Do not make the mistake of thinking in terms of “buying CEP”, just like you do not buy an SOA or an EDA.* You think, plan and design in terms of CEP, just like you should do in an SOA or EDA.* These are constructs, not products.

In other words, for “true CEP” you need a number of components, some of the components might be in the architectural style of SOA, others might be in the architectural style of EDA.** Your solution architecture for solving a complex event processing problem might have request-reply transactions, or it might have fire-and-forget messages.* You might have a Neural Networking component for analytics and a rules component for filtering, mediation and scheduling.* You might even have a stream processing component performing as a high performance filter and pattern matcher on streaming data where the output is forwarded to a Bayesian Classifer for further processing.

My key message in this post is that CEP requires a number of technologies to solve complex distributed computing problems.** Do not be fooled into thinking that a single product is “CEP” no more than a single product is SOA or EDA.

Source...

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quiz

QUIZ(6) 							 BSD Games Manual							   QUIZ(6)

NAME

     quiz -- random knowledge tests

SYNOPSIS

     quiz [-t] [-i file] [question answer]

DESCRIPTION

     The quiz utility tests your knowledge of random facts.  It has a database of subjects from which you can choose.  With no arguments, quiz
     displays the list of available subjects.

     The options are as follows:

     -t      Use tutorial mode, in which questions are repeated later if you didn't get them right the first time, and new questions are presented
	     less frequently to help you learn the older ones.

     -i      Specify an alternative index file.

     Subjects are divided into categories.  You can pick any two categories from the same subject.  quiz will ask questions from the first cate-
     gory and it expects answers from the second category.  For example, the command ``quiz victim killer'' asks questions which are the names of
     victims, and expects you to answer with the cause of their untimely demise, whereas the command ``quiz killer victim'' works the other way
     around.

     If you get the answer wrong, quiz lets you try again.  To see the right answer, enter a blank line.

   Index and Data File Syntax
     The index and data files have a similar syntax.  Lines in them consist of several categories separated by colons.	The categories are regular
     expressions formed using the following meta-characters:

	   pat|pat  alternative patterns
	   {pat}    optional pattern
	   [pat]    delimiters, as in pat[pat|pat]pat

     In an index file, each line represents a subject.	The first category in each subject is the pathname of the data file for the subject.  The
     remaining categories are regular expressions for the titles of each category in the subject.

     In data files, each line represents a question/answer set.  Each category is the information for the question/answer for that category.

     The backslash character (``'') is used to quote syntactically significant characters, or at the end of a line to signify that a continuation
     line follows.

     If either a question or its answer is empty, quiz will refrain from asking it.

FILES

     /usr/share/games/quiz.db  The default index and data files.

BUGS

     quiz is pretty cynical about certain subjects.

BSD
								   May 31, 1993 							       BSD