Architectures for big Enterprise Applications with Angular -- Talk from Frontend Usergroup RheinMain, June 2018

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@ManfredSteyer Architectures for huge Enterprise Applications with Angular Manfred Steyer SOFTWAREarchitekt.at ManfredSteyer

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@ManfredSteyer About me… • Manfred Steyer • SOFTWAREarchitekt.at • Angular Trainings and Consultancy • Google Developer Expert (GDE) Page ▪ 3 Manfred Steyer Public: Vienna, München, Zürich In-House: Every where, every time http://softwarearchitekt.at/workshops

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@ManfredSteyer Goal Get to know three concepts for structuring big Angular based enterprise application

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@ManfredSteyer Contents 1) npm Packages 2) Monorepos 3) Micro Apps 4) How to choose?

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@ManfredSteyer 1) npm Packages

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@ManfredSteyer Structure of an npm Package • /node_modules • your-stuff • package.json

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@ManfredSteyer Angular Package Format https://goo.gl/hjt7G3

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@ManfredSteyer Lots of DETAILS

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@ManfredSteyer Angular CLI 6+ supports Packages

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@ManfredSteyer Create Library with CLI >= 6 npm install -g @angular/cli ng new lib-project cd lib-project ng generate library logger-lib ng generate application playground-app ng serve --project playground-app ng build --project logger-lib

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@ManfredSteyer Folder Structure

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@ManfredSteyer DEMO

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@ManfredSteyer Deployment

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@ManfredSteyer Publishing to npm Registry • Increment version in package.json • ng build --project logger-lib • npm publish --registry http://localhost:4873 • npm install --registry http://localhost:4873

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@ManfredSteyer Alternatives for setting the Registry • Global: npm set registry http://localhost:4873 • Default: registry.npmjs.org • npm get registry • Project: .npmrc in project root

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@ManfredSteyer npm Registries Nexus Artifactory Team Foundation Server Verdaccio npm i -g verdaccio verdaccio

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@ManfredSteyer DEMO

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@ManfredSteyer Advantages • Distribution • Versioning • Decoupling between lib authors and app authors

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@ManfredSteyer Disadvantages • Distribution • Versioning • Decoupling between lib authors and app authors ;-)

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@ManfredSteyer Disadvantages Distribution • Annoying within project • Prevents gritting further libs Versioning • Old versions • Conflicts • How to force devs to use latest version? Decoupling • What if lib authors == app authors?

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@ManfredSteyer 2) Monorepos

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@ManfredSteyer Workspace

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@ManfredSteyer Advantages Everyone uses the latest versions No version conflicts No burden with distributing libs Creating new libs: Adding folder Experience: Successfully used at Google, Facebook, …

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@ManfredSteyer Two Flavors • Like Workspaces/Solutions in different IDEs Project Monorepo • E. g. used at Google or Facebook Company-wide Monorepo

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@ManfredSteyer Moving back and forth Npm Registry

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@ManfredSteyer Moving back and forth Git Repo Git-based Sub-Module (read only or read/write)

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@ManfredSteyer Tooling & Generator https://nrwl.io/nx

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@ManfredSteyer Visualize Module Structure

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@ManfredSteyer DEMO

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@ManfredSteyer Advantages Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project

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@ManfredSteyer Disadvantages Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project

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@ManfredSteyer Disadvantages Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Sub Project Team A Team B Contract

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@ManfredSteyer Disadvantages More Coordination Blocking Tasks Complex Overall System One Architecture One Technology Stack Hard to change One size fits all?

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@ManfredSteyer 3) Micro Apps

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@ManfredSteyer Idea System

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@ManfredSteyer Idea µService µService µService

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@ManfredSteyer Idea µApp µApp µApp

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@ManfredSteyer Folie▪ 43 Pro Contra

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@ManfredSteyer UI Composition w/ Hyperlinks µApp SPA µApp SPA µApp SPA

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp Shell

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@ManfredSteyer µService iframes iframe iframe iframe Shell ✓ Strong Isolation ✓ Straight forward  Overlapping Elements?  Lots of page requests?  SEO?  Resize iframe

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@ManfredSteyer µService Web Components Web Component Web Component Web Component Shell  Standard  Frameworkunabhängig  Custom Elements    Shadow DOM: CSS Isolation  Nesting  Framework Support?

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@ManfredSteyer µService Mehrere SPAs in index.html SPA SPA SPA Shell ✓ Similar to Web Components  No Standard  Nesting isn’t possible

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@ManfredSteyer Angular Elements in Angular >= 6

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@ManfredSteyer MicroApp with Angular Elements @NgModule({ imports: [BrowserModule], declarations: [MicroAppComponent], bootstrap: [], entryComponents: [MicroAppComponent] }) export class AppModule { constructor(private injector: Injector) { } ngDoBootstrap() { const MicroAppElement = createNgElementConstructor( MicroAppComponent, { injector: this.injector }); customElements.define('micro-app', MicroAppElement); } }

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@ManfredSteyer Loading MicroApps

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@ManfredSteyer DEMO

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@ManfredSteyer 4) Choosing a Solution

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@ManfredSteyer Some General Advice for Macro-Architecture Shared state, navigation b/w apps Hyperlinks Legacy Apps or *very very* strong isolation needed? iframes Need separate Deployment/ mix Technologies Web Components "Majestic Monolith" w/ Libs and Monorepo little much yes no yes no Not a good fit when customer facing

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@ManfredSteyer Conclusion Packages: Reuse Monorepo: Structure Microservices: Decoupling CLI 6+ CLI 6+/ Nx Links, iframes, Web Comp.

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@ManfredSteyer Contact and Downloads [mail] manfred.steyer@SOFTWAREarchitekt.at [web] SOFTWAREarchitekt.at [twitter] ManfredSteyer d http://softwarearchitekt.at/workshops Slides & Examples