Lightning Chess, The fun way to learn the Lightning Component Framework

Dreamforce 2016 - #SFLightningChess

Lightning ChessThe fun way of learning the Lightning Component Framework

Lieven Juwet@LievenJuwet

Technical Architect @ ABSI

Samuel De Rycke@SamuelDeRycke

Technical Architect @ ABSISalesforce MVP

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Agenda

● Demo● Lightning Component Framework● Component Encapsulation● Lightning Chess: Component Composition● Event Driven Architecture● Lightning Chess: Event Driven approach● Let’s code it● Q&A

Lightning Chess

● R&D project● Effort: 40 hours + rework● Chess application on the Salesforce Platform● Real-time multiplayer game● Built using Lightning Component framework

Lightning what?!

Application Architecture

Streaming API

Custom Objects

Apex Controllers

Lightning Chess Player ClientsLightning Chess

Player Clients

Serv

er C

all

Subs

crib

e

Upda

tes

Salesforce Platform

Demo: Lightning Chess

Lightning Component Framework

● Lightning Application

● Lightning Components

● Lightning Events

The Fundamentals

Lightning Component Component Bundle

Component Bundle

Component< markup />

StyleCSS

RendererJavascript

ControllerJavascript

HelperJavascript

Design< markup />

Documentation

< markup />SVG File

Component Encapsulation

● Object Oriented Programming principles● Internals are not exposed to the outside● Public vs Private interface

What happens in the component, stays in the component

Component Public:● Public

Attributes● Public

Methods● Events

Private:● HTML DOM● CSS Style● Private Attributes● Controller Functions● Helper Functions● Apex Controller

Component Encapsulation

● Easy to reuseUse them in different applications or other components making use of a component’s

public interface● Open for extension

Extend the functionality of a component without impacting other components.● Independent

A component does not rely on its consumers but on its public interface to function. This makes it easy to use a component in any system.

● CompactSplitting up your application/component into smaller components each with their

own function will lead to code that is small and easy to maintain.

Component can be:

“Think Component Encapsulation“

Lightning Chess: Component Architecture Divide and conquer

Streaming API Listener

General Game ComponentChessboardChessboard Location


Player List

Challenge List




Subscribe to streaming API and forward streaming event messages

Lightning Chess: Streaming API Listener

<aura:component>  <aura:attribute name=”listeners” type=”String[]” access=”public”/> <aura:registerEvent name=”StreamingEvent” type=”c:StreamingEvent” />

 <ltng:require scripts="" afterScriptsLoaded="{!c.setupStreaming}" />

<aura:attribute name="sessionId" type="String" access="private"/> <aura:handler name="destroy" value="{!this}" action="{!c.closeConnections}"/>

</aura:component>

Lightning Chess: Component Architecture Mistakes were madeChessboard

Chessboard Location


Player List

Challenge List



Chessboard has too much responsibility. What if we want to extend and allow users to choose what game they want to play?

“Single Responsibility“

Lightning Chess: Component Architecture Divide and conquer


General Game ComponentChessboardChessboard Location


Player List

Challenge List





Event Driven Architecture Event types

Component Event Application EventSend only to components in the parent hierarchy above

Broadcast to the entire Lighting Application.

Tighter coupling between sender and receivers

Very loose coupling between sender and receivers

<aura:event type=”Component” description=”Chessboard_Location_Select”>

<aura:attribute name=”location” type=”Object” />

</aura:event>

Event Driven Architecture

● Part of the public interface● “Something happened, I don’t know what to do, so do whatever you like!”

Loosely coupled communication

<aura:component description=”Chessboard_Location”>  <aura:registerEvent name=”select” type=”c:Chessboard_Location_Select” /></aura:component>

<aura:component description=”Chessboard”>  <c:Chessboard_Location select=”{!c.handleLocationSelect}” /></aura:component>

Lightning Chess: Event Driven Approach Communication is key

Chessboard

Chessboard Location


Chess Logic Server Call

I am selected as a starting location

I am selected as a target location

Locations x,y please mark yourself as targetable

I received a new move with following details

Following piece moved from x to y

Click

Click

“Loose communication through Events“

Let’s Code!Extend the Chessboard Location component by adding Drag-and-Drop support

Summary Takeaways

“Think Component Encapsulation“


“Loose communication through Events“

Resources

Code @ Github!http://bit.ly/LightningChess-CodeRead more about Lightning Chess Architecture:http://bit.ly/LightningChess-Blog

http://bit.ly/LightningChess-Code

http://bit.ly/LightningChess-Blog

Questions?Reach us on twitter #SFLightningChess

Thank Y u

Technology

Lightning Chess, The fun way to learn the Lightning Component Framework