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Groovy for Java developers and testers

How Java developers and testers could use Groovy to increase their efficiency

AUGUST 6, 2015

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• Life Science Department, Saint-Petersburg, Russia

•Mikhail_Denisov@epam.com

Mikhail Denisov

Demo project: https://git.epam.com/mikhail_denisov/itweek2015-groovy

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WHY GROOVY?

Smooth Java integration. Runs on the JVM, 100% compatible with Java bytecode1

Concise, familiar and easy to learn syntax (“syntactic sugar”)3

Dynamic language, with static-typing and static compilation capabilities4

GDK - the extension to the JDK5

Metaprogramming (Builders, DSL), functional programming, scripting6

Supported by many systems and frameworks2

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AstraZeneca SOA Factory project

• Over 20 web-services (DB and AD interaction)• Service Bus proxy for each service• 4 environments: dev, test, preprod, prod• 3 regions: Emea, America, Asia

20 * 2 * 3 * 4 = 480 endpoints

SOA Factory project

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GROOVY BY EXAMPLES

Working with database and files1

HTML, JSON and XML parsing2

JSON and XML generation3

Working with SOAP-service4

Groovlets5

Advanced Groovy6

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Maven POM.xml configuration with Groovy-Eclipse-Compiler

http://docs.groovy-lang.org/latest/html/documentation/tools-groovyeclipse.html

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GROOVY BASICS: variables and collections

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GROOVY BASICS: closures and GDK

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GROOVY BASICS: objects and classes

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Working with database and files

Case: update database with data from file

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GROOVY TESTS: interface implementation with Map

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HTML parsing with RegExp

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JSON parsing with JsonSlurper, GPath expressions

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JSON parsing with JsonSlurper, GPath expressions

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XML parsing: Google News RSS

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GROOVY METAPROGRAMMING: working with metaClass

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GROOVY METAPROGRAMMING: expanding Java classes

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GROOVY METAPROGRAMMING: missing method interception

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XML GENERATION: class MarkupBuilder

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XML GENERATION: class MarkupBuilder

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JSON GENERATION: class JsonBuilder

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SOAP Web Service interaction with WSLite

SOAP WebService “Magic Square”

WSDL: http://www.cs.fsu.edu/~engelen/magic.wsdl

Add WSLite to pom.xml

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SOAP Web Service interaction with WSLite

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SOAP Web Service: service MagicSquare.groovy

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SOAP Web Service: test MagicSquareTest.groovy

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Groovlet: display results as HTML page

web.xml – add groovy.servlet.GroovyServlet

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Groovlet: display results as HTML page

Create script src/main/webapp/scripts/magic1.groovy

Build application, run it in the servlet containerBrowse the link http://localhost:8080/itweek2015-groovy/scripts/magic1.groovyResult would be like this

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Groovlet: scripts/magic2.groovy - params, <form>, <table>

application, context

javax.servlet.ServletContext

session javax.servlet.HttpSessionrequest javax.servlet.HttpServletresponse javax.servlet.HttpResponseout response.getWriter()

Groovlet implicit objects:

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Groovlet: add parameters and HTML markup: result s

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Groovlet: script/magic3.groovy - add CSS

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Groovlet: scripts/magic3.groovy - result

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SOAFactory PROJECT UTILS

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SOAFactory PROJECT UTILS

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ADVANCED GROOVY: DSL

How many lines are needed to run it as a DSL script?

please show the square_root of 1024

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ADVANCED GROOVY: DSL

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ADVANCED GROOVY: GPars

Case: we have to collect data from many independent sources (collect all jokes about Chuck)

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ADVANCED GROOVY: GPars

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Groovy for Java developers and testersQ & A

AUGUST 6, 2015