Book Image

Getting Started with Oracle Event Processing 11g

Book Image

Getting Started with Oracle Event Processing 11g

Overview of this book

Events are everywhere, events which can have positive or negative impacts on our lives and important business decisions. These events can impact a company's success, failure, and profitability. Technology now allows people from all walks of life to create Event Driven applications that will immediately and completely respond to the events that affect you and your business. So you are much more responsive to your customers, and competitive threats, and can take advantage of transient time sensitive situations. "Getting Started with Oracle Event Processing" will let you benefit from the skills and years of experience from the original pioneers who were the driving force behind this immensely flexible, complete, and award winning Event Stream Processing technology. It provides all of the information needed to rapidly deliver and understand Event Driven Architecture (EDA) Applications. These can then be executed on the comprehensive and powerful integral Java Event Server platform which utilizes the hardware and operating system.After an introduction into the benefits and uses of Event Stream Processing, this book uses tutorials and practical examples to teach you how to create valuable and rewarding Event Driven foundational applications. First you will learn how to solve Event Stream Processing problems, followed by the fundamentals of building an Oracle Event processing application in a step by step fashion. Exciting and unique topics are then covered: application construction, the powerful capabilities of the Oracle Event Processing language, CQL, monitoring and managing these applications, and the fascinating domain of real-time Geospatial Movement Analysis. Getting Started with Oracle Event Processing will provide a unique perspective on product creation, evolution and a solid understanding on how to effectively use the product.
Table of Contents (19 chapters)
Getting Started with Oracle Event Processing 11g
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Determining if geometries relate to each other


The spatial operations allow you to determine the relationship between two or more geometry objects. Some examples are:

  • Geometries are next to each other

  • Geometries are contained by one another

  • Geometries intersect boundaries

In the last chapter, you used the contain operation. Let's start by revisiting it:

boolean contain@spatial(
  Geometry containingGeometry, 
  Geometry containedGeometry, 
  double tolerance)

The contain() function returns true if the containedGeometry is contained by the containingGeometry, otherwise it returns false. A geometry is considered contained by another geometry if all the points that make up the former is completely within the shape of the latter. In particular, a geometry is not considered contained by another geometry if they touch boundaries. This is exemplified in the following diagram:

The tolerance argument is used as a measure of accuracy of the data. When you specify a tolerance for the spatial operations...