Rethinking Enterprise Architectures with Node.js

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KAMMYSLIWIEC RETHINKING ENTERPRISE ARCHITECTURES WITH NODE.JS

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KAMMYSLIWIEC KAMIL MYŚLIWIEC SOFTWARE ENGINEER | NESTJS CREATOR  @KAMMYSLIWIEC 

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KAMIL MYŚLIWIEC SOFTWARE ENGINEER  @KAMMYSLIWIEC 

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KAMMYSLIWIEC NODE.JS

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KAMMYSLIWIEC NODE.JS IS A JAVASCRIPT RUNTIME BUILT ON TOP OF GOOGLE CHROME'S V8 ENGINE

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KAMMYSLIWIEC WHY NODE.JS?

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KAMMYSLIWIEC LANGUAGE

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KAMMYSLIWIEC PRODUCTIVITY

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KAMMYSLIWIEC REUSABILITY

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KAMMYSLIWIEC COMMUNITY

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KAMMYSLIWIEC JAVASCRIPT JAVA PYTHON C# PHP 0% 17,5% 35% 52,5% 70%

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KAMMYSLIWIEC SIMPLICITY

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SIMPLICITY IS   PREREQUISITE FOR RELIABILITY

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KAMMYSLIWIEC NODE.JS IS SIMPLE

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KAMMYSLIWIEC NODE.JS IS SIMPLE?

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KAMMYSLIWIEC SETUP TIME 1 MINUTE

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KAMMYSLIWIEC 2 LINES   OF CODE

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KAMMYSLIWIEC const app = require('express')(); app.listen(3000);

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KAMMYSLIWIEC const app = require('express')(); app.listen(3000);

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KAMMYSLIWIEC const app = require(‘express')(); app.get('/', (req, res) =>  res.send('Hello world')); app.listen(3000);

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KAMMYSLIWIEC SIMPLICITY?

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KAMMYSLIWIEC COMPLEXITY LINES OF CODE y = x

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KAMMYSLIWIEC COMPLEXITY LINES OF CODE y = ex

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KAMMYSLIWIEC NODE.JS IS SIMPLE  UP TO A CERTAIN POINT

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KAMMYSLIWIEC Simplicity Lines of code y = ex

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KAMMYSLIWIEC Simplicity Lines of code y = ex

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KAMMYSLIWIEC WHY?

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KAMMYSLIWIEC SIMPLICITY

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KAMMYSLIWIEC PROJECTS HEAVILY VARY BY PEOPLE’S DESIGN DECISIONS

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KAMMYSLIWIEC COMPLEXITY LINES OF CODE y = ex

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KAMMYSLIWIEC SIMPLICITY LINES OF CODE y = 1/ex

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KAMMYSLIWIEC SIMPLICITY LINES OF CODE y = 1/ex EXPECTED CURVE

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RETHINK

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KAMMYSLIWIEC SPLIT IT DOWN

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KAMMYSLIWIEC MIDDLEWARE

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KAMMYSLIWIEC MIDDLEWARE CLIENT REQUEST

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KAMMYSLIWIEC MIDDLEWARE CLIENT REQUEST MIDDLEWARE MIDDLEWARE

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KAMMYSLIWIEC TOO MANY RESPONSIBILITIES

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KAMMYSLIWIEC ERROR HANDLING ACCESS RESTRICTION VALIDATION SIDE-EFFECTS MUTATION

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KAMMYSLIWIEC SPLIT IT DOWN

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KAMMYSLIWIEC ERROR HANDLING VALIDATION ASYNC  EFFECTS ACCESS  RESTRICTION LOGGING MUTATION

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KAMMYSLIWIEC IT IS MISLEADING TO CALL THEM IN THE SAME WAY

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KAMMYSLIWIEC LOOSE COUPLING

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KAMMYSLIWIEC RELATIONS

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KAMMYSLIWIEC A B

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KAMMYSLIWIEC A B C

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KAMMYSLIWIEC DECOUPLE MODULES

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KAMMYSLIWIEC MODULE FACADE

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KAMMYSLIWIEC ORGANISE CODE   PER FEATURE

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KAMMYSLIWIEC DECOUPLE   TRANSFER LAYER

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KAMMYSLIWIEC TRANSFER  LAYER DOMAIN   LAYER

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KAMMYSLIWIEC MULTILAYERED   ARCHITECTURE?

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KAMMYSLIWIEC CONTROLLER DATA  ACCESS

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KAMMYSLIWIEC app.get(‘/organizations/:id’, (req, res) => { Organization.find({ name: 'JsCamp' }, (err, value) => res.json(value)); });

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KAMMYSLIWIEC app.get(‘/organizations/:id’, (req, res) => { Organization.find({ name: 'JsCamp' }, (err, value) => res.json(value)); });

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KAMMYSLIWIEC CONTROLLER DATA  ACCESS SERVICE

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KAMMYSLIWIEC ENTITIES

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KAMMYSLIWIEC CONTROLLER DATA  ACCESS SERVICE DOMAIN  MODEL

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KAMMYSLIWIEC BE PROGRESSIVE

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KAMMYSLIWIEC app.get('/users', (req, res) => { usersService.findAll() .then((users) => { for (let user of users) { delete user.password; } return users; }) .then((users) => res.json(users)); });

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KAMMYSLIWIEC app.get('/users', (req, res) => { usersService.findAll() .then((users) => { for (let user of users) { delete user.password; } return users; }) .then((users) => res.json(users)); });

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KAMMYSLIWIEC app.get('/users', (req, res) => { usersService.findAll() .then((users) => { for (let user of users) { delete user.password; } return users; }) .then((users) => res.json(users)); });

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KAMMYSLIWIEC app.get('/users', (req, res) => { usersService.findAll() .then((users) => { for (let user of users) { delete user.password; } return users; }) .then((users) => res.json(users)); });

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KAMMYSLIWIEC @Get('users') async findAll() { return await this.usersService.findAll() .filter(user => !user.isDisabled) .map(user => omit(user, 'password')); }

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KAMMYSLIWIEC @Get('users') async findAll() { return await this.usersService.findAll() .filter(user => !user.isDisabled) .map(user => omit(user, 'password')); }

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KAMMYSLIWIEC @Get('users') async findAll() { return await this.usersService.findAll() .filter(user => !user.isDisabled) .map(user => omit(user, 'password')); }

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KAMMYSLIWIEC TYPES

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KAMMYSLIWIEC TYPES ARE   PRICELESS

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KAMMYSLIWIEC TRADE-OFF?

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KAMMYSLIWIEC TYPESCRIPT

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KAMMYSLIWIEC MODULE FACADE

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KAMMYSLIWIEC FACADE INPUT OUTPUT

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KAMMYSLIWIEC LET’S DRAW   CONCLUSIONS

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KAMMYSLIWIEC CLEAN ARCHITECTURE    BOILERPLATE & DESIGN SPECIFICATION  NOT DEVELOPER-FRIENDLY