Event Processing in Action.pdf

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Etzion and Niblett / Event Processing in Action

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Etzion and Nibblett / Event Processing in Action

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MEAP Edition

Manning Early Access Program

For more information on this and other Manning titles go to

www.manning.com

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Etzion and Niblett / Event Processing in Action

Preface

Part I Introduction to event processing

1. Entering the world of event processing

2. Event programming principles

Part II Deep dive into event processing

3. Defining the events

4. Producing the events

5. Consuming the events

6. The event processing network

7. Putting events in contexts

8. Filtering and transforming

9. Detecting event patterns

Part III Additional topics

10. Engineering and implementation considerations

11. Focal points on major challenging topics

Part IV Conclusion

12. Emerging directions of event processing

Appendices

A. Definitions

B. The Fast Flower Delivery example

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Etzion and Niblett / Event Processing in Action

Preface

A BOUT THIS BOOK

Event processing is an emerging area, the appearance in recent years of various commercial

products and open source offerings, making it the fastest growing segment of enterprise

middleware. While interest in this subject is growing, gaining a deep understanding of event

processing is still a challenge. As it is a relatively new area it is not surprising that several

different approaches to event processing have been evolving in parallel. This means that

when trying to understand what event processing is about it can be difficult to see the wood

from the trees. This is the main intention of this book, to give a deep dive into what event

processing is (the wood) and to provide the reader an opportunity to experience this using

some of the existing event processing languages or tools (the trees).

This is book is intended for those interested in understanding what's behind event

processing technologies and how they should be employed to design and implement

applications. This book is the first comprehensive view about event processing for the

technical reader, it looks at "event processing" as a generic technology, in a way that fits all

the different implementation approaches, and thus familiarizes the reader with the entire

wood, and not just with a specific tree. The book provides a deep dive into all the concepts

that need to be understood in order to design event processing applications, and guides the

reader through these concepts by showing the construction of a single example application

that uses event processing.

The interested reader also gets a unique opportunity to see how to implement this

application using representatives of the various programming styles that exist today: SQL

extension, rule based, graphical oriented, and script oriented languages. The website that

accompanies the book provides examples based on this application, with instructions on how

to download trial versions of various commercial and open source event processing products.

This allows the reader to see the concepts applied in action, to play further with the code,

and to devise further examples.

Besides the design concepts the book also discusses implementation issues and the

authors' opinion about the event processing of the future. A survey of existing products is

provided, as well as a comprehensive set of terminology definitions.

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Etzion and Niblett / Event Processing in Action

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THE INTENEDED READERSHIP

The book is intended for those who want to gain understanding about event processing

concepts in depth; the primary audience is a technical audience consisting of architects,

designers, developers and students. The book will benefit designers and architects who wish

to know how to design applications that use event processing, and developers who would like

to understand the relationships between these concepts and current event processing

languages and products. It can also serve as a textbook for an academic or professional

course on event processing, and for this reason it provides an “additional reading” list along

with a few exercises at the end of each chapter.

THE BOOK ' S METHODOLOGY

In this book we have taken a top-down approach by describing the concepts (the wood), and

then providing the reader an opportunity to view the trees (representatives of the different

approaches) and experiment with them through the associated Website. This approach is

somewhat different from the bottom-up approach of describing a single language or product.

We have taken this approach as there are several different approaches for implementing

event processing applications, and the transfer in thinking from one to another is not easy.

We use a general model that consists of seven building blocks, which we believe is an

effective way to explain the concepts and facilities of event processing. Moreover, we feel

that there are advantages in using this level of abstraction when designing and developing

applications.

In order to illustrate these concepts we use a single example which we follow throughout

the course of the book. This example, based around flower delivery, can be understood with

no prior domain knowledge, but nevertheless contains many of the concepts that we discuss

in the book.

Terminology does vary somewhat between different event processing products, so in this

book we have tried to define all the terms and concepts that we use, and we provide a

summary of these definitions in Appendix A. Our definitions are written in an explanatory

style rather than in a rigorously formal style, so as to make them accessible to a broad

audience. Where possible we are using definitions that are consistent with the terminology

established by the Event Processing Technical Society (EPTS) however, our scope of terms is

much larger.

THE BOOK ' S STRUCTURE

The book has four parts. The first part consists of chapter 1 and chapter 2 and is an

introduction to the subject and to the terms and concepts that we are using. Readers who

are already familiar with Event Processing can just browse through it, noting the definitions

we use, without reading it thoroughly.

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