the dark arts of building your own framework (andrey glashenko)

@CubaPlatform#CubaPlatform

The Dark arts of building your own framework

Andrey GlaschenkoKonstantin Krivopustov@CubaPlatform www.cuba-platform.com

@CubaPlatform#CubaPlatform

Konstantin KrivopustovCTO at Haulmont• CUBA Platform Team leader• Coding architect

About authors

Andrey GlaschenkoBDD at Haulmont• Java developer background,

logistics optimization algorithms specialist

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About Haulmont• Based in Samara (Russia) and

London• Specializing in Java enterprise

software• Products in ECM and taxi fleet

management areas• Bespoke solutions

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High level full stack Java framework for enterprise applications development

•2008 – development start•2009 – base of all new Haulmont’s projects•2012 – first delivered projects by other IT companies•2014 – released in Russian as a trial•2015 – released in English

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Yet another framework?• Existing frameworks: either low level or too “heavy”

Requirements• Full stack• Web UI• Feature rich• Uniform• Open

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UI

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Requirements•Web•Fast to develop hundreds of screens with standard UI•Same language for the whole application

•Ability to assign a whole feature to a developer

•Code transparency and easier refactoring

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Vaadin – a perfect match•Pure server-side Java for application development•Java (via GWT) for browser side components•Rich set of components•Server-side UI code suitable for desktop client•Vibrant community•Apache license

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Vaadin – issues•Resolved: performance in old browsers•Creating own components is complex•Resolved: excessive code to create layouts•Extending components: private fields/methods•Server-side memory consumption

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ORM

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AttributesAllJob - 88Account – 29Individual – 24Service – 32Payment_type – 16Driver - 61Vehicle – 23Total: 273

RequiredJob - 17Account – 1Individual – 1Service – 1Payment_type – 1Driver - 1Vehicle – 1Total: 23

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OpenJPA FetchPlanFetchPlan allows OpenJPA to load partial entities (23..29).Hibernate always loads all attributes (273).Result: 10 times more data then we need!• Extra DB server load• Extra MW CPU load and memory consumption

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OpenJPA issues•Abandoned by IBM -> development almost stopped•JPA 2.1 not supported (join on, stored procs, etc)

Solution: migrate to EclipseLink (Q3 2015)

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Other

tech

nolog

ie

s

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ContainerSwitched from JBoss EJB to Spring Framework.

CUBA application can be deployed to any lightweight Java web server.

How we use Spring Framework:• Dependency injection container for both middleware and clients • Remoting via HTTP invoker for communication between clients and middleware•Low-level tasks schedulers•RESTful web services

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Build SystemSwitched from Ant to Gradle.

Encapsulated platform build logic in plugins

More benefits:• Very fast incremental builds •Automatic transitive dependency management•Storing dependencies in a hierarchy of Maven repositories

Gradle DSL complexity isolated by Studio.

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Exte

nsion

s

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One size does NOT fit allOff-the-shelf products are great until customer wants something in his way.

Typical vendor options:•Say NO. The luckiest get away with it!•Branch. Easy start of the road to hell..•Integration points: plugins

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ExtensionA project extending the base product, which can modify base product: •Add new entities, screens, beans•Override entity attributes•Modify screens•Modify business logic •Modify style via SCSS

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All CUBA projects are extensions

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Adding an attribute

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Develo

ping

CUBA

appli

catio

ns

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Tools and Languages

Tools•IDE•+ IDE Plugin•+ Studio

Languages•Java•XML•JPQL

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Shortcutting the development cycle

See result

Make change

Compile

DeployRestart

Hot deploy

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Typical developer workflowStudio IDE TypeProject files and build scripts

Auto

Data model and DB scripts

Auto

Standard CRUD screens AutoMW services and entity listeners stubs

Auto

Middleware logic Java, JPQLComplex screens – Studio visual designer, IDE or

bothXML

Screens logic Java, JPQLCustomize UI Theme SCSS

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Next step: PaaS

Studio

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Summar

y

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Our place in the ecosystem

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CUBA can help..to deliver your application, if•it has many screens and some non-trivial business logic•it has standard UI requirements (no kittens!)•pre-built business features do not fit•you want to stay in control•you have limited time and budget•it is supposed to be used by multiple customers

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Interested?Welcome to our stand S5!

•Live development process demo•Examples of CUBA applications

<Stand photo>

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Q & A