Hackers of the World

1

• Hackers of the World!
• JUG Presentation

Jody Garnett
2
Jody Garnett

• uDig Development Team Leader
• GeoTools Project Management Committee (PMC)
  Member
• GeoServer contributor
• OSGEO Member
• OGC Member
• Hobbies
• Swordsmanship
• Swing dancing

3
Refractions Research

• Victoria, BC, Canada
• Spatial Systems Consulting
• Open Source Software
• PostGISuDig / GeoTools

4
What is Geospatial?

• Something you can draw on a Map
• It lets us play with BIG DATA
• This means we can do some real computer science
• It is also visual
• When I have a bug the map is upside down (or
  sideways or missing)
• My mom can understand what I do

5
Why Open Source Geospatial

• Geospatial is hard
• Open source makes it possible (for me)
• Access to .. standards, experts and data
• It is a calling card
• Did you hear of me (or Refractions) because of
  uDig and PostGIS?
• And the rest
• Shared code, ability to hack, free, ability to
  accept patches,

6
Java GeoSpatial

• There are lots of players
• GeoTools
• GeoServer
• uDig
• GeoNetwork
• But what can you do with them?

7
Geospatial Architecture

• Spatial Database
• Concurrency
• Transactions
• Seamlessness
• Internet Publishing
• Feature Access
• Map Access

• Data Manipulation
• Direct Access
• Editing
• Cartography

8
ESRI Architecture
ArcSDE
9
Open Source Architecture
?
PostGIS
10
GeoTools ( GeoAPI)

• Where useful code lives
• GeoTools- Implements Standards
• http//docs.codehaus.org/display/GEOTOOLS
• GeoAPI Interfaces for Standards
• http//docs.codehaus.org/display/GEOAPI

11
GeoTools Details

• Part of the OSGEO (woot!)
• Project Management Committee
• Module Maintainers for
• Oracle, DB2, Rendering, Shapefile
• A number of organizations
• but responsibility is always to the individual

12
GeoTools James MacGill

• Hobby
• Baby (Rebbeca)
• Working
• Google (now)
• Contact
• geotools-gt2-users_at_lists.sourceforge.net
• geotools-devel_at_lists.sourceforge.net

13
GeoServer

• The Open Planning Project
• A J2EE project implementing some of the open
  standards
• Web Map Server
• for drawing maps
• Web Feature Server
• get the real data
• and change it

14
GeoServer Dave Blasby

• History 10 GIS
• PostGIS
• Contact
• dblasby_at_openplans.org
• geoserver-devel_at_lists.sourceforge.net
• http//geoserver.sourceforge.net/

• What he is Doing
• GeoServer Lead
• GeoServer 1.3
• GeoWiki
• Demo site
• What he wants to do
• Feature Versioning
• Community Planning
• Hobbies
• Scuba, Travel

15
GeoServer Chris Holmes

• History
• GeoServer in 2002
• z39.50 support
• Released GeoServer 1.0.0
• What he is Doing
• Just visited Africa
• New York Now
• What he wants to do
• Set up Open Spatial Infrastructure using
  Open-Source (see EOGEO on web)
• Hobbies Travel
• Contact cholmes_at_openplans.org

16
Justin Deoliver

• Contact
• jdeoliver_at_refractions.net
• History
• JUMP Developer
• uDig Devleoper
• Known for
• Mad Plans
• What he wants to do
• OpenGL Rendering System
• GeoServer Framework

17
GeoServer Demo

• I could talk more but lets see something work
• You are going to see
• GeoServer
• MapBuilder

18
Eclipse

• Eclipse - a universal tool platform
• Extensible IDE
• Java based
• Open Source
• The Eclipse Platform
• Provides building blocks and a foundation for
  creating tools (plug-ins).
• Plug-ins are independent subsystems that
  contribute functionality to your application.

19
Eclipse RCP

• RCP - Rich Client Platform

• Eclipse RCP is based on a plug-in architecture.

• Group of plug-ins work together within your
  Eclipse environment.

• RCP Runtime provides a Platform that acts a
  mediator and helps plug-ins get along.

20
Eclipse RCP
Eclipse RCP is more than an application framework
system, it is an platform that not only allows
extension via plug-ins, but also organizes the
plug-ins into a rational structure.
vs
21
Application Framework

• You may be familiar with working an Application
  Frameworks
• Customize through sub-classing and tweaking
• Your own contributions are always second rate,
  not include in the documentation etc
• It took me three months to learn MFC
• Pros
• Very easy to set up a workingapplication
• Cons
• Until you want to do somethingthe outside the
  intended use

22
Application Platform

• Eclipse RCP is a platform lets look at the
  differences
• Customize through extentions
• Advertise how you can be customized through
  extention points
• Your own contributions are on equal termswith
  everything else.
• It took me an a couple of days to learnEclipse
  RCP.
• Pros
• Wow is this great
• Cons
• Need to take a fair bit ofresponsibility when
  letting othersextend your work.

23
Eclipse RCP
Text
Help
Update
Compare
Debug
Search
Team/ CVS
IDE Text
Primary Application
(optional)
(optional)
(optional)
IDE
UI (Generic Workbench)
Resources
Eclipse RCP
JFace
(optional)
SWT
Runtime (OSGi)
24
Everything is a Plug-in

• Everything is a plug-in even applications

Plug-ins
. . .
25
Eclipse Plug-ins

• Plug-in
• An independent tool that provides a service
  within your application environment.
• Represented by an instance of a plug-in class.

26
Plugin.xml

• Plugin.xml and Manifest file

• Defines your plug-in and contains settings needed
  to activate it at runtime.

• Must include the name, id, version, and vendor
  name of the plug-in.

• Optional definitions also include elements such
  as a plug-in class name and extension points.

27
Plugin.xml
Your Eclipse workbench
plugin.xml
28
Plugin.xml
Code Sample
ltplugin name "Readme File Editing Tool" id
"org.eclipse.ui.examples.readmetool" version
"0.9" provider-name Object Technology
International, Inc. class"org.eclipse.ui.example
s.readmetool.ReadmePlugin"gt ...
29
Plugin.xml
Code Sample
ltrequiresgt ltimport plugin"org.eclipse
.ui /gt lt/requiresgt ...
30
Plugin.xml
Code Sample
ltextension point"org.eclipse.ui.views"gt ltview
id"org.eclipse.examples.readmetool.
readmeplugin " namereadme class
"org.eclipse.ui.examples.readmetool.ReadmePlugin
"/gt lt/extensiongt
31
Extensions
ToolExtentions
Eclipse Runtime
32
Eclipse EMF

• Eclipse Modelling Framework (EMF)
• complex API
• Modeling people will try and talk to you
• Why bother?
• Integrates modelling into programming environment
• Allows rapid changes in application model
• Weeks versus Hours
• Drag-n-drop, events, persistence all built-in

33
Eclipse EMF
Compile
Edit
Debug
34
Questions

• Is everything clear?
• Still awake?
• Additional details after demo

35
uDig

• User Friendly Desktop Internet GIS
• Eclipse RCP Based
• Great for Customization
• Great Platform for your own App
• We have some cool toys
• Java 5, Adaptive rendering, happy community

36
Jesse Eichar

• Known For
• Lead Developer
• RCP
• EMF
• Rendering
• Contact
• jeichar_at_refractions.net or freenodeudig

37
Richard Gould

• Known For WMS, Silly, Strange Music

38
uDig Demo

• Okay lets see this work
• You will see
• Local Data
• Remote Data
• Use of Standards
• Pretty Colours (Themes)

39
uDig Architecture
Application
uDig
Eclipse RCP
Platform
EMF
GEF
GeoTools
PostGIS
WMS
WFS
GML
Shape
Libraries
Java Topology Suite (JTS)
Java 1.5
Language
Java Image I/O
JAI
40
Where is the Data

• The Catalog contains a list of Services, which
  each contain resources.

41
A bit of abstraction

• Service - Resource

42
Extensible Interface Pattern

• The IResolve class acts as an extensible
  interface within the GIS Platform.

Super Class
extends
43
IResolve

• same design as Eclipse IResource class.

• IResolve works as a service handle a proxy for
  remote content.

• It can be resolved into real objects, such as
  services.

44
IResolve

• The following are the core responsibilities of
  IResolve

• IResolve.getIdentifier() is a unique URL used to
  identify this resource

• IResolve.canResolve( Class type ) is a non
  blocking check to see if a type of resource is
  available

• IResolve.resolve( Class type, IProgressMonitor
  monitor ) will aquire the request resource

45
Questions?
46
GeoTools
47
GeoTools WMS Client

• We wrote generic WMS client
• WMS has 4 versions!

Web Map Server
Specification
1.0.0
1.1.0
1.1.1
1.3.0
48
GeoTools WFS Client

• We wrote generic WFS client
• GML handling is hard!

Code Generator
Parser
XML Schema
Source Code
Compile
Classic XML Schema Processing System
JVM
49
GeoTools WFS Client

• We wrote generic WFS client
• GML handling is hard!

Parser
Schema
XML Data Objects(XDO)
Our XML Schema Processing System
JVM