Venkat Viswa

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I am a Software Developer. I work for Thomson Reuters in Bangalore.venkat viswanathanhttp://www.blogger.com/profile/03996925876937680465noreply@blogger.comBlogger49125
Updated: 10 hours 50 min ago

Renaissance of Programming Languages

Wed, 2011-04-20 22:42
Really good talk by Venkat Subramaniam on Progamming language Renaissance.

Some of the key points

* We are in the middle of programming language renaissance
* Nice analogy between history and Progamming Languages

Day 1 Last session : Javascript powerful language out there

Wed, 2011-04-20 06:50
Last session of the day by Venkat on the power of Javascript

Javascript

Feels like Java & C
Similar to perl in some ways
Untyped Language

Rules

1) Case sensitive
2) goo idea to use ;
3) commenting style is same as Java/C++
4) null and undefined are used to indicated null
5) Strings are single or doule quotes and are immutable

Functional in nature : Functions are first class citizens

Pass and return functions. Everything should be object oriented is a wrong notion.

Variables are typeless. but you need to declare variables with var

Global and local scoping for variables. No block level.

Control structures are like C : statements, expressions, for loops

var sayHello = function(name) {
print('hi');
}

sayHello is now a handle to a function.Its powerful since, you can now register them as event handlers.

IN Javascript everything is an expression. there is no statement as such.

Functions are Objects


function Car(year) {
this.year=year;
}

var myCar = new Car(2011);

print (myCar.year);

myCar is an instance of Car.

Encapsulation is not really about security. Its for code maintainence.

prototype is like a backpack. Any method not defined on object is routed to prototype.

Car.prototype.drive = function(dist) {
print('driving..);
this.miles += dist;
}
Car.prototype.tune = function() {print ('tune')};

print (myCar["year"]); --> you can use this instead of dot notation. You can dynamically recieve the parameter since its in a double quote.

Object is nothing but a collection (property holder).
It can be a function, object or a collection of properties

for (var prop in myCar.__proto__) {
print(prop + '\n');
}


Inheritance in Javascript

Composition is better than Inheritance. Ruby and Groovy have delegation (@delegate).

Javascript supports inheritance through method composition.

function Base() {
}

function Dervied() {
}

Derived.prototype = new Base();

Code Quality

jslint is a nice tool to check code quality.

You need to separate the logic from HTML page.

Overall it was an amazing session with good insights on JS

GIDS Session 6- Microformats and semantic web

Wed, 2011-04-20 06:04
Scott Davis on Microformats for the web.

He explains the significance of metadata.

meta name="description" content=""

meta name="keywords" content=""

SEO : Search Engine optimization

RDFa : Microformats http://rdfa.info

Sites like flickr , facebook are using RDFa

www.alistapart.com

www.yelp.com

Article on How Best Buy is using the Semantic Web.

Tools on Semantic Web
GoodRelations Annotator tool
Semantics Radar
Operator

Microformats

e.g. hcalendar,hcard

Mircoformats made Simple.

http://ablognotlimited.com

Social Graph API : Google code

Microformats are not meant to replace webservices. They are meant to augument them.

Session 5 : JQuery at work

Wed, 2011-04-20 04:53
Tom Marrs is giving a session on JQuery at work.

How to get started with JQuery :

JQuery/Javascript Basics --> AJAX --> JQUERY UI --> Jquery Plugins

3 layers of web --> Behaviour (Javascript), Presentation (CSS), Content (HTML)

http://www.sitepoint.com/ : WebDesign for developers.

Some Caveats :
1) Javascript should be unobtrusive
2) Prefer External Styles
3) Just enough CSS --> Tag , Class & ID selectors, Descendent/combination selectors

Demos on javascript with Java and Javascript.

How to iterate, How to navigate the dom, utility methods.

Ajax : $.ajax

JSON : Lightweight $.getJSON

JQuery Widgets : DatePicker, Accordion, Tabs, Dialog Box, Auto complete,Tool tip, JGrowl

GIDS Award ceremony

Wed, 2011-04-20 03:43


Best .NET productivity tool : Code rush

Best Collobaration tool : Adobe acrobat connecct

Best Content Management and Document Managment tool :Microsoft sharepoint 2010

Best Modeling tool : IBM Rational rose

Change and Configuration Management : Telerik

Testing category : Junit testing framework.

Security Category : Microsoft security essentials.

Web Development : Adobe Flash Platform

Mobile development : Nokia symbian platform

Frameworks : .NET framework

Databases : Dev Express Analytics

Session 4 : HOw to create a beautiful web

Wed, 2011-04-20 03:22
Harish Vaidyanathan from MIcrosoft is giving a quick session on HTML 5, IE 9.

Demo on Native HTML 5

Installing websites as applications. If you have IE 9 installed, you can PIN applications.

Graphical capabilities in IE 9

Browser scales across multiple cores.

All of graphics is offloaded to GPU. Leverage native capabilities in IE. the aquarium demo rocked in IE9 whereas it sucked in chrome.

There is also another fishbowl demo where IE9 wins hands down against Chrome.

IE 9 Patterns

html5labs.com

Microsoft is also annoucing an early look at Internet Explorer 10 (IE 10). It moves the web forward by being 100% compatible with Html 5. and supports css gradients, multi column Layout , ECMA script 5 .

ie6countdown.com : Microsoft website to initiate people to move away from IE 6. If people come to your website from IE6, send a message to them buy copying the piece of code.

Good to know that Microsoft too is joining the HTML5 bandawagon.

HTML 5 Deep dive

Wed, 2011-04-20 01:54

Venkat subramaniam is giving a deep dive into HTML 5 features.

Presenatation is a todo list in textmate instead of a presentation, which is quite cool.



New HTML 5 tags like section,article,aside,header,footer

CSS 3 Pseudo- classes
nth-of-type(even) and nth-of-type(odd) are new things for changing background for alternate colours.

last-child is special for last row. can be applied for tr and td.

No more classes through each element

Targeted input types
email : input type=email
placeholders :get a clue for placeholders in grayed out manner
placeholder="email@example.com"
autofocus : set focus on field
turning off autocomplete
required
pattern
url
search
number
range min 1 max 10 value
date , datetime,color

Inplace editing : contenteditable

border-radius:10px; ( oval box)

moz-tranform,webkit-transform,transform --> for rotating sections : rotate(degree)

transparencey

box-shadow

dragdrop

Audio and video

Client side data
localStorage is par of window object. its part of a hashMap.
Benefits
local storage,session
offline web apps

GIDS Session 3 - HTML 5

Wed, 2011-04-20 00:34

Scott Davis : I really loved his sessions last year. He is a real expert on Grails. He has a website on thirstyhead.com.

Starts of with a quip on his new shirt.



HTML 5 enhancements

1) Form enhancements, mobile support

Biggest new feature. --> Semantics over markup. Currently pages are cluttered with Divs currently. You can provide separate tags for various page sections like nav, header , footer and sections.

Screen readers can parse the code and act accordingly.

Desktop Browser support for HTML 5
Google already uses HTML 5 and provides outstanding support in their chrome browser.
Apple Safari already supports HTML 5
Mozilla Firefox and Opera supports HTML 5 as well.

IE 9 supports HTML 5 specification even though its not available on windows xp.

Good that everyone is now meeting the specifications.

Support for Mobile in HTML 5

All applications are HTML 5 with a thin app wrapper like NYTImes. Javascript is the write once run anyware platform finally :).

RIM Playbook has outstanding HTML 5 support.

Cost to implement technology is very high initially, and the value is very low. Dont wait for final standard. You need to wait for Oreilly book on that technology then its here to be used :)


HTML 5 is here to stay and start now instead of waiting .

http://diveintohtml5.org by Mark Pilgrim . Entirely free online book.


New Elements

Doctype is amazingly simple :

New semantic elements: header, nav, footer,section, article, aside.

HTML 5 Reset Stylesheet : Include all these to use display:block;

http://html5shiv.google.com/svn/trunk/html5.js




Form Enhancements

INput elements support following new values : tel,search, url, email, dateime, date, month, week, time, email .


Any browser that doesnt support the new values, will present a text instead. this is true only for desktop browsers. But mobile browses have issues.

Modernizr
Checks for html features support. New idea is to program to the most mordern browser and pollyfill for the others using Modernizr.

Mobile support : Smart phones and Tablets are selling really fast.

www.html5rocks.com

App Cache : explicitly cache js, css, images.

Cache Manifest can explicity cache resources.

Cache,Network and fallback sections.

typical application could be an twitter client in html5 that can switch between online and offline mode. Full control of the cache through javascript.

Data Storage : Allows you to storage as a hashmap.Upto 5 MB of local storage is available per domain per url.

Web SQL database : supported by all browsers except firefox and IE.


Video support


Youtube html5 video player. Use video with object tags combination.

Some more websites to checkout :
http://html5doctor.com
http://html5demos.com/

ON the whole it was an awesome session , that really opened up the world of HTML 5.

HTML 5 Cross browser Polyfills is the way to go

GIDS Session 2 : Demo on Blackberry playbook

Wed, 2011-04-20 00:11

Next up is a session on playbook that was launched in US yesterday

What is a Tablet?

Combines best of both worlds : smartphone and Laptop

Features of Blackberry playbook



features are amazing : dual core 1ghz processor , 7 inch touch screen , front and rear cameras.

multitasking --> this is not currently possible in ipad

full support for adobe flash sites.

support for HTML 5

HDMI PORT

ultra convenient and less than a pound

sales force integration

lots of enterprise features : securely pair Blackberry, document viewing and editing over 2000 apps available.

Developing for playbook

Browser : Flash 10.x + html5

RIA : Adobe AIR + blackberry web works

www.blackberry.com/playbook

GIDS Session 2 : Demo on Blackberry playbook

Wed, 2011-04-20 00:11
Next up is a session on playbook that was launched in US yesterday

What is a Tablet?

Combines best of both worlds : smartphone and Laptop

Features of Blackberry playbook

features are amazing : dual core 1ghz processor , 7 inch touch screen , front and rear cameras.

multitasking --> this is not currently possible in ipad

full support for adobe flash sites.

support for HTML 5

HDMI PORT

ultra convenient and less than a pound

sales force integration

lots of enterprise features : securely pair Blackberry, document viewing and editing over 2000 apps available.

Developing for playbook

Browser : Flash 10.x + html5

RIA : Adobe AIR + blackberry web works

www.blackberry.com/playbook

GIDS 2011 - .Web day Session 1

Tue, 2011-04-19 23:03

Arijit Chatterjee from Adobe is giving an excellent session on Building Next Generation of Experiences.

His presentation is full of interesting images. I like the fact that there is less content in the presentation and more of verbal communication.

The main message behind the presentation is to how to make the user experience better - Understand your users, how to make beautiful websites, understanding local sentiments and speaking in local language.

Some key things to keep in mind

1) Build trust
2) Maintain Focus on workflows --> move from one task to another
Create in context help - if necesary
3) Involve all Senses - the more sensory organs are involved, the more you will be able to retain users.
for web app Visual,Touch,Sound are the key .

4) do not build something Jazzy - it might drive people away from your site

5) Acknowledge Status clearly once you are done with something irrespective of Victory or Failure.

6) 3 D display wherever relavant

7) Use sound - Judiciously

8) use of high definition haptics


Wrapping up with a few stunning images . Aquarium Sink, Bubble Cosmos , Interactive multi modal workspace.

Post Lunch session -OSGI

Sat, 2009-07-18 03:56
Lunch was extremely good and felt good after eating. Had only less though so as to keep in make.

Now the topic is on OSGI by Sameera Jayasoma . WSO2 is an open source company hased in Srilanka. Their main product is WSO2 carbon,Which is a fully componentized SOA platform based on OSGI. Then there was some PR on their company.


Modular Systems
Break large system into more smaller,understandable units called modules.Benefits of modular systems are reuse,abstraction,division of labour and ease of repair.


Module should be self contained,highly cohesive and loosely coupled.

Java for building Modular systems
--> provides class level modularity(public, non public methods)
--> we need somthing like external packages, internal packages in a jar

ClassLoader hierarchy : Bootstrap classloader (rt.jar) --> extension classloader (ext.jar) --> application classloader (a.jar,b.jar)


Problems with JARs

--> Jar is unit of deployment in Java and typical java app consists of set of jar files

--> no runtime representation for a JAR.

when java loads a class, it tries to load class one by one in the classpath.

--> multiple version of jar files cannot be loaded simultaneoulsy
--> Jar files cannot declare their dependencies on other jars

Java lacks true modularism and dynamism. Java has given flexibility to build system on top of it. This is called OSGI (dynamic module system for java)

OSGI

--> Bundle is a unit of modularization of OSGi. OSGI app is a collection of Bundle.
Bundle is similar to jar and contains additional metada in Manifest.mf file. In osgi , java package is the unit of information hiding. unlike in jar when class is the
unit of information hiding.

--> bundle can share and hide packages from other bundles.

sample manifest.mf file

Bundle-MainfestVersion:2
Bunle-Name :
Bundle-SymbolicName:
Bundle-Version:1.0.0 (major,minor,micro version)
Export-Package
Import-package:

symbolic name and version are unique for a bundle. default value for version is 1.0.0
all packages in bundle are hidden from other bundle by default. if we need to share package explicitly mention the name.

Bundles & Class Loaders
OSGI gives separate classloaders per bundle,thereby eliminating hierarchial classloading in java

System bundle is a special bundle that represents the framework and registers system services

Tooling for osgi : eclipse pde is the best of the lot

osgi provides command line interface

ss -> lists all the bundles in the system

b/bundles - gives the list of informaiton about the bundle.export information.

b 0 --> gives system bundl information

export-hundle and import-bundle
require-bundle : import all exported packages from another bundle. but this is discouraged.

Issues with require bundle
Split packages,bundle changes over time,require bundles chain can occur.

fragment bundles : attached to a host bundle by the framework.Shares parent classloader.

runtime class loading in osgi: order of loadin

1) call parent clas loader (only for java.*)
2)imported packages
3)required bundles
4)load from its own internal classpath
5)Load from fragment classpath

Usage of fragment bundle 1) provide translation files to different locales

OSGI specifications --specifies framework and specificaions

osgi alliance

current version is 4.1

osgi can be considered as a layer on top of java.can also use jni to talk to OS. functionality of framework is deivided into several layers

1)module 2)lifecycle 3(

Lifecyce layer : manage lifecyle of api.
bundle starts --> installed,resolved,starting,active,stopping,uninstalled.

Register a service using bundle service using registerservice on bundlecontext

Using a service --> find a serviceReference,get the object,cast it to a proper type and use the service

Events and Listeners

framework fires serviceevents during registering a service,unregistering a service

services are dynamic. monitor services using service listeners,service trackers,declarative service,iPOJO and blueprint services.

Service Tracker

declarative service

SCR (service component runtime)

Powerful Reporting with BIRT

Sat, 2009-07-18 00:18

This is the sesison that i hope to get the maximum benefits from especially since we have started using BIRT for our projects. The session is by Krishna Venktraman from Actuate, who is the director



Background

--> Most applications have some kind of data visualization need. Real world applications don't consider reporting when they design the application. BIRT provides a framework that manages all the reporting requirements.

Traditional approach :

Buy closed source commercial products or build custom developed solution
With open source based products things become much easier.

Emergence of BIRT Project
BIRT was initiated in 2004 as a top level eclipse project. IBM,Innovent and Actuate are the key members.
Focus was BIRT was to make report development easy.Its open and standards based and provides for rich programmatic control. It has both simplicity and well as Power to create complex reports. BIRT supports of concept of reporting libraries that promotes reuse and reduces changes.

The main audience for BIRT was report developers,advanced report developers who use scripting, runtime integration developers who use birt viewer and engine apis, report design integrator who use design engine apis, extension developers who develop extention points and finally core development who do eclipse development itself.

There were five major releases since project launch with 1.0 ,2.0,2.1,2.2,2.3,2.5 as the versions. It was built from ground up and lot of community feedback was take into account

Key capabilities
--> Simple to complex layouts
--> Comprehensive data access
--> Output formats
--> Reuse and developer productivity
--> Interactivity and linking
--> Multiple usage and productivity aids

Some key features added in 2.x versions
--> ability to join datasets
--> enhanced chart activity
--> multiple master page support
--> Dynamic crosstab support
--> CSS files can be linked
--> Emitters for XLS,Word , PPT and Postscript
--> Webservices can act as datasource
--> Javascript/Java Debugger

BIRT design gallery : some of the displays llok really good.

High level BIRT acrhitecture

Two key components
1) Report Design Engine
2) Report runtime Engine

at the end of design process we get a .rptdesign. report engine then looks at the file, interprets it, fetches the data and goes about the generation process. we get an .rptdocument. Key services of report engine are generation services,data services,charting engine and presentation services.

BIRT exchange is a community site for posting all BIRT related issues.

Key API
a) Design Engine API b) Report Engine API c) Chart Engine API

Extension points
--> data source extensibility
--> custom business logic extensibility using scripting and acess java code
--> Visualization extensibility
--> Rendering content for output (emitters)

Deployment options

--> Commercial Report Server
--> J2EE Application server
--> Java application

Actuate provides Actuate BIRT report designer,BIRT report studio, BIRT Viewer,BIRT Interactive Viewer,deployment kits, iServer Express,iServer Enterprise.

Now for the actual report designs...

Just had an overview of the birt tool. Going through the series of demos on basic report, now basic charts, then crosstab/matrix report.

Book Marks and hyper links

Click the element and then pickup bookmark from properties . Now go to the place where you want to place hyperlink and link up the bookmark.

Filters
Limit what to display . You can limit at dataset level or at table level.

Sub Reports

Main Report --> Outer table
Sub Report --> nested table
Pass data value from outer table to nested table

In BIRT we need to nest tables in order to create sub reports.
Use Dataset parameter binding on the child set to get the data from parent dataset

BIRT Scripting

Mozilla Rhino script engine is embedded in BIRT.
Scripting = Expressions + Events
It users server side scripting. All the export options will get the same output.


Event Handling
Initialization Report level events (-initalize,-beforeFactory) --> Data source Open (-beforeOpen,-open) --> Data Set Generation (--beforeOpen,--open,fetch) --> Dataset Generation

Generation phase : Report level,datasource level, element level
Render : report level,element level

can implement powerful logic using scripting

Report Libaries
Just use export library by right clicking on the rptdesign file. Then click on use library and say use library.It has all the data sources, data sets and report items.
Library is a container of reporting items.
Can do local overrides on things imported from libraries

Templates
File --> New Template.Serves as starting points for speedy report development.
Display a visual image. then register this template with the new wizard.

Last piece was a demo on how to deploy the reports.

One big disappointment was i couldn't get any idea on how to integrate report engine and birt viewer with the custom applications.

On the whole it was a good session.

Keynote II

Fri, 2009-07-17 23:53


Enhancing the developer productivity using RAD for websphere


--> Interesting the two main competitors give the keynotes one after the other

IBM Rational Architecture and construction
--> for solution,software and enterprise architects : Rational Data Architect,Rational Software modeler
--> for architects and designers who code in java,c++,xml --> Rational software architect Standard edition
--> Rational application developer --> for developers


IBM RAtional Applicaiton Developer for websphere

--> accelerates development
--> do even traceablity matrix
--> support for jpa and code generation

Comprehensive JEE5 tools

Unit testing is provided out of box
Visually layout JPA and EJB 3.0 classes
Convert UML to WSDL using RSA product
Provides excellent AJAX support

Enhanced support for Web 2.0
Declare POJOs and make it as REST service. Call Rest service as JSPs.
Javascript editor and debugger

JSF support
visual development of JSF pages
Data abstraction objects for easy data connectivity - SDO
Automatic code generation for data validation,formatting
Integration of third party JSF libraries

Portal development support is also excellent.

One of the very key features is to Automate performance and memory testing . This is built on top of eclipse TPTP.

Automates azpplication testing using WebSphere Application Server 6.0,6.1 and 7.0

IBMs strategy is to deliver high quality solutions by moving towards flexible architecture,automation layer,reduce onboarding

JAZZ platform : is meant for open community.

Mail id of the presenter is :bhrengen@in.ibm.com

Keynote address for the day

Fri, 2009-07-17 23:52

First again a PR from SaltMarch :) .


The topic will be Plug-in to rapid development on Weblogic with Eclipse by Dhiraj Bandari

Dhiraj Bandari is as sales consultant from Oracle, moved on from BEA with the acquisition.

Oracle Enterprise Pack for Eclipse (OEPE) is a plugin that is really useful when we used weblogic application server integration. Provides the following features

--> Weblogic server (start,stop)
--> web services
--> spring
--. JSF + facelets
--> DB tools
--> ORM workbench



ORM workbench

--> creates the entity classes and helps to run all db functionalities
--> supports eclipselink,kodo,openjpa
--> has database schema broswer similar to TOAD

--> provides spring support


Tools for JAX-WS web services
--> New facets for weblogic web service development

Weblogic Server Tools
--> Run/deploy/debug locally or remotely
--> FastSwap ,shared libraries,Deployment plans
--> Migration support

Weblogic deployment descriptor editors


Oracle's strategy is to stop development on weblogic workshop. They will develop & enhance only JDeveloper and Enterprise pack for eclipse.


FastSwap Feature -- for iterative development

Traditional JEE Development cycle is Edit --> Build --> Deploy --> Test

Using Modern IDES it becomes Edit --> Deploy --> Test

FastSwap's goal is to eliminate the Deploy step Edit --> Test

FastSwap detects changes to class files,redfined changed classes,Non invasive and development mode only

Demo on FastSwap operation

How to enable fast swap feature --> go to weblogic application deployment descriptor and ebale fast swap. Then instant chagnes to ejb classes,web classes can be seen.

Day 2 live blogging - EclipseSummit India

Fri, 2009-07-17 23:51
Participants are quiely settling in. Strength has considerably dwindled compared to yesterday. There was unexpected drizzle in Bangalore , causing me to get partly wet and making me feel miserable in an AC room.

Wireless Internet connection does not seem to work as expected :(. Hope to post all these one by one when i am back in the network.


Expectations for today
Today I am eagerly looking forward to attend BIRT workshop in the morning followed by a sumptuous lunch and then another workshop on OSGI.

JPA 2.0 New Features

Fri, 2009-07-17 04:30
JPA 2.0 is releasing 2009 fall. (JSR 317)

Goal

--> Fil in ORM mapping gaps
--> Make object modeling more flexible
--> offer simple cache control abstraction
--> allow advanced locking settings
--> JPQL enhancements

More standardized properties
--> some properties are used by each and every driver

Persistent unit properties like javax.persistence.jdbc.driver, javax.persistence.jdbc.url

JPA 2.0 supports join table as well as f key relationships.
Collections of embeddables or basic values.

This is made possible using elementcollection annotation

OrderedLists
order is maintained even if you move things around by using an index.

More Map flexibility
Map Keys and values can be : Basic objects,embeddables, entities

Enahcned embedded support
Embeddables can be nested and can have relationships

Access Type options
--> mix access modes in a hierarchy (field or properties)
@Access annotation

Derived Identities
JPA 1.0 relationship field cannot be part of the id

JPA 2.0 @Id + @OneToOne

Second Level Cache
API for operating on entity cache which is accessible from EntityManagerFactory
Supports only ver basic cache operations , which can be extended by vendors

@Cacheable annotation on entity (default is true)

There is also a property by the name shared-cache-mode to denote per PersistenceUnit whether to cache.
--no entities
--only cacheable entities
-- all entities

Properties cacheRetreiveMode and cacheStoreMode per EM method call whether to
read from cache

Locking
1.0 allows only for optimistic locking
2.0 provides for optimistinc locking by default
pessimistic locking can be used per entity or query

Lock mode values introducted
Optimistic (=READ)
optimistic_force_increment(=write)
pessimistic_read
pessimistric_write

API Additions
Lockmode parameter added to find,refresh
Properties parameter added tofind,refresh,lock
Other useful additions
void detach(Object entity)
unwrap
Query API addition
getFirstResult
getHints
Enhanced JP QL
Timestamp literals
Non-polymorphic queries
IN expression may include collection parameter --> IN (:param)
Ordered List indexing
CASE statement

Criteria API
Similar to eclipselink expressions,hibernate criteria
Criteria API - Canonical Metamodel
--> For every managed class , there is a metamodel class


Load State Detection
JPA can integrate with Bean validation (JSR 303) : Hibernate Validator is an implentation

JPA 2.0 shpped as part of Java EE6 release

JOptimizer

Fri, 2009-07-17 04:01
Back after a sumptuous lunch

Tool by Embarcadero technogies : http://www.embarcadero.com/products/j_optimizer/


Available standalone as well as eclipse plugin

Uses
--> Detecting excessive object allocation

--> memory leaks

--> detecting bottle necks

--> code coverage/code quality

--> thread debugging

--> Breakdown JEE requests

--> request analyzer

remotely connect and find which layer is causing problems. Can go into any level of detail.

code coverage

how to analyze and find out threading issues ?

--> Detecting deadlocks and visually analyze the deadlocks.

richard.davies@embarcadero.com

Patterns in eclipse

Fri, 2009-07-17 01:57
Three rules of eclipse

plugin may not change screen,task and create objects unless user asks for it

1) User owns the screen

2) User owns the CPU

3) User owns the memory

--> Do not use singleton pattern.Memory allocation never goes away

Building the UI withoug loading plugins

Decoupling using adapters
--> dynamic implementation of an interface
--> class can be adapted to any interface
--> best example is the properties view

4) most of the items are implemented as services
Located,Scoped and Destroyed

5) Separation of concerns
same class should not do a,b,c,d,e
use handlers
6) scalable UI
browse instead of combo
filters instead of presenting a large set of info
always use group data in relevant sections
provide deselect /select all buttons
differentiate and place common buttons appropriately

Eclipse and Building Data Centric RIA

Fri, 2009-07-17 00:50
Demo of portal type application using flex
Interactive charts --> looked really good with nice drilldowns

Rich Internet Applicaions
1) REal time data push
2) resizable
3) Rich Data entry
4) Chat
5) Data Synchronization
6) Audio and Video
7) Offline

Open Screen platform : Adbobe flash platform

clients --> AIR and flash player

Servers/services --> Blazeds,data services

Flex framework

tools to design and develop : flex builder

Understanding flex

written in mxml markup

flex sdk is free and opensources

flash builder : eclipse based professional IDE

benefits :

UI goes to client only once . after that only data changes..


Approach for Developing RIAs

Design focused
Data focused

Coding

Testing and Deployment

Demo

Model Driven development

Steps

1) Create a new project

2) Create a data model (fml file)

3) Deploy model to LCDS (Live cycle data services)

4) import fml file

5) create mxml and add datagrid.

6) Dnd datamodel to data grid

7) Run application.

Business logic can be written in custom assembler. Normal one is fiber assembler.

Even tomcat is fine. Internally fml creates java classes at runtime during startup.


Data Centric Development using Flash Builder

1) Define Service (CF,php,java,soap,rest)

2) Model Service (flash builder examines service, builds design-time model)

3) Bind Operations to Flex UI Components (data binding,UI generation,Paging,Data-management)

AMF : Action script messaging format used for sending and reciving data , more efficient than json and xml.

Testing and deployment

Network monitor
unit testing framework
Command line builds ( coming soon)

Demo of Ruby service plugin

Data Centric Development Extensibility

Extension points
Key interfaces and classes for custom service
IServiceWizard,IServiceIntrospector,IServiceProperties
FlexService,FlexServiceOperation,FlexServiceConfig
Key interfaces and classes for componentConfigurator


Flash Catalyst

Imports photoshop files and analyzes it. Based on eclipse platform. takes mockups and creates flex application based on them. Generates flex code behind the scenes.

Wow.. thats too good

Require flash builder license and run time license for LCDS

Resource

www.flex.org
Tour de flex : www.adobe.com/devnet/flex/tourdeflex/

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