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Verticalized Systems and Micro Frontends

Verticalized Systems and Micro Frontends

Voxxed Days Athen (Athen, Greece)

https://voxxeddays.com/athens/

SQUER Solutions

June 07, 2019
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  1. @duffleit leitner.io
    Micro Frontends
    a Strive for Fully Verticalized Systems
    Voxxed Days Athen
    @duffleit leitner.io

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  2. @duffleit leitner.io
    David Leitner
    Senacor Technologies

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  3. @duffleit leitner.io
    “the idea of micro frontends is
    to extend the concept of micro services
    to the frontend world.”

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  4. @duffleit leitner.io
    Secret 1:
    That's fine in 80 % of
    the cases.
    SPA
    API
    Gateway
    Microservice
    Microservice Microservice
    DB
    DB
    DB

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  5. @duffleit leitner.io
    Monolith
    API
    Gateway
    SPA
    DB
    Secret 2:
    That's also fine in 80 %
    of the cases.

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  6. @duffleit leitner.io
    Microservice
    API
    Gateway
    SPA
    Microservice Microservice
    DB
    DB
    DB

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  7. @duffleit leitner.io
    Sam Newman
    “microservices are small
    and focused on one thing
    to be autonomous.”

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  8. @duffleit leitner.io
    Why autonomous?
    ✔ Independent Deployments
    ✔ Distinct Operations
    ✔ Technology Agnostic
    ✔ Model around Business Domains
    ✔ Small Interface Surface
    ✔ Parallel development

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  9. @duffleit leitner.io
    Microservice
    API
    Gateway
    SPA
    Microservice Microservice
    DB
    DB
    DB
    ❌ Independent Deployments
    ❌ Distinct Operations
    ❌ Technology Agnostic
    ❌ Small Interface Surface
    ❌ Parallel development
    Frontend
    Monolith

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  10. @duffleit leitner.io
    Microservice
    API
    Gateway
    SPA
    Microservice Microservice
    DB
    DB
    DB
    SPA
    API
    Gateway
    Micro
    Frontends

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  11. @duffleit leitner.io
    μService
    Ordering
    μService
    DB
    μService μService
    DB
    DB
    Catalogue Profile
    μService
    DB
    DB
    Hyperlink Hyperlink

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  12. @duffleit leitner.io
    ✔ Independent Deployments
    ✔ Distinct Operations
    ✔ Technology Agnostic
    ✔ Small Interface Surface
    ✔ Model around Business Domains
    ✔ Parallel development
    Based on the assumption to have
    fully verticalized systems.
    μService
    Ordering
    μService
    DB
    μService μService
    DB
    DB
    Catalogue Profile
    μService
    DB
    DB
    Hyperlink Hyperlink
    Approach 1:
    Hyperlink Connected Applications

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  13. @duffleit leitner.io
    μService
    Ordering
    μService
    DB
    μService μService
    DB
    DB
    Catalogue Profile
    μService
    DB
    DB
    Hyperlink Hyperlink
    Dashboard
    Hyperlink
    μService
    DB
    ⛔ Overfetching
    ⛔ Overrequesting
    Approach 1:
    Hyperlink Connected Applications

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  14. @duffleit leitner.io
    Approach 1:
    Hyperlink Connected Applications
    with Backend for Frontends
    μService
    Ordering
    μService
    DB
    μService μService
    DB
    DB
    Catalogue Profile
    μService
    DB
    DB
    Hyperlink Hyperlink
    Dashboard
    Hyperlink
    μService
    DB
    BFF
    Service
    BFF
    Service
    BFF
    Service
    BFF
    Service
    https://samnewman.io/patterns/architectural/bff/
    Presentation
    Process Flow
    Domain Logic
    Data
    Presentation
    Process Flow
    Domain Logic
    Data

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  15. @duffleit leitner.io
    Approach 1:
    Hyperlink Connected Applications
    with GraphQL
    μService
    Ordering
    μService
    DB
    μService μService
    DB
    DB
    Catalogue Profile
    μService
    DB
    DB
    Hyperlink Hyperlink
    Dashboard
    Hyperlink
    μService
    DB
    GraphQL
    Presentation
    Process Flow
    Domain Logic
    Data

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  16. @duffleit leitner.io
    The more coarse-grained you can go,
    the more coarse-grained you should go.
    Or: Think big.

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  17. @duffleit leitner.io
    But,

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  18. @duffleit leitner.io
    Hyperlink Integration
    breaks your SPA.

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  19. @duffleit leitner.io

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  20. @duffleit leitner.io
    μService
    Ordering
    μService
    DB
    μService μService
    DB
    DB
    Catalogue Profile
    μService
    DB
    DB
    Hyperlink Hyperlink
    Dashboard
    Hyperlink
    μService
    DB
    View Aggregation Layer
    Horizontal Layer
    Ripple Effect

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  21. @duffleit leitner.io
    Dashboard
    Profile
    Profile
    μService
    DB
    Catalogue
    μService
    DB
    Catalogue
    Ordering
    Ordering
    μService
    DB
    Dashboard
    μService
    DB

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  22. @duffleit leitner.io
    Dashboard
    Profile
    Catalogue
    Ordering
    Ordering
    Catalogue
    Hyperlink Hyperlink
    Dashboard
    How to slice?
    One “Micro Frontend” per page. 2...n Micro Frontends per page.

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  23. @duffleit leitner.io
    How to integrate them?

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  24. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Composed Application Micro Frontend
    Build Time Integration Server Side Integration Runtime Integration

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  25. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Mono Repo
    package.json
    Composed Application Micro Frontend
    Build Time Integration
    MonoRepo
    ✔ Allows extensive code
    sharing and reuse.
    ✔ Simplifies Dependency
    Management.
    Angular
    Workspaces

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  26. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Composed Application Micro Frontend
    Build Time Integration
    ❌ Independent Deployments
    ❌ Distinct Operations
    ❌ Technology Agnostic
    ✔ Small Interface Surface
    ✔ Model around Business Domains
    ✔ Parallel development

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  27. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Composed Application Micro Frontend
    Server Side Integration
    Project Mosaic

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  28. @duffleit leitner.io
    Based on the concept of Server Side Includes
    or Edge Side Includes
    ⛔ JS and CSS global scoped
    ⛔ Round-Trips are needed

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  29. @duffleit leitner.io
    Tailor is a Layout Server
    header
    fragment
    μService
    account
    fragment
    μService
    catalogue
    fragment
    μService
    maps your request to
    a template
    checkout-template.html ...
    dashboard.template.html
    profile-template.html

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  30. @duffleit leitner.io
    supports Javascript-Isolation
    init(fragment-dom){
    ...
    }
    How about
    account
    fragment
    μService
    html
    script
    styles
    1...n

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  31. @duffleit leitner.io
    supports Javascript-Isolation
    account
    fragment
    μService
    html
    script
    styles
    1...n init(fragment-dom){
    ...
    }
    isolate CSS:
    naming-convention
    like BEM

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  32. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Composed Application Micro Frontend
    Server Side Integration
    ✔ Independent Deployments
    ✔ Distinct Operations
    ✔ Technology Agnostic
    ✔ Small Interface Surface
    ✔ Model around Business Domains
    ✔ Parallel development

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  33. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Composed Application Micro Frontend
    Runtime Integration
    Aggregating UI
    Routing, Templates, Lazy Loading

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  34. @duffleit leitner.io
    the aggregation is done on a single point.
    Aggregating UI

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  35. @duffleit leitner.io
    the aggregation and configuration is done on a single point.
    Aggregating UI

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  36. @duffleit leitner.io
    the aggregation and configuration is done on a single point.
    immutablewebapps.org
    index.html
    https://12factor.net/

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  37. @duffleit leitner.io
    Repository
    Build & Deploy
    Server
    Browser
    Composed Application Micro Frontend
    ✔ Independent Deployments
    ✔ Distinct Operations
    ✔ Technology Agnostic
    ✔ Small Interface Surface
    ✔ Model around Business Domains
    ✔ Parallel development
    Runtime Integration

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  38. @duffleit leitner.io
    Ok, which one to use?

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  39. @duffleit leitner.io
    Server
    Browser
    Server Side Integration
    Runtime Integration
    Request Response Model
    Interactions between
    different Verticals are done
    on the Backend.
    Longliving App
    State in the frontend &
    verticals need to interact
    with each other.

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  40. @duffleit leitner.io
    Cool, anything that can go wrong?

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  41. @duffleit leitner.io
    UI/UX Consistency
    Shared State
    Resilience
    Tracing/Analytics
    Offline-First
    ...

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  42. @duffleit leitner.io
    1 Micro-Frontend per Page
    Hyperlink Integration
    n Micro-Frontends per Page
    Buildtime Integration
    Serverside Integration
    Runtime Integration

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  43. @duffleit leitner.io

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  44. @duffleit leitner.io
    Micro Frontends
    in a nutshell
    Integration and Slicing
    Is your
    application
    big?*
    Frontend
    Monolith
    no
    Are UI/Domain
    Parts strongly
    independent?
    yes
    Applications
    integrated with
    Hyperlinks
    yes
    Server Side
    Integration
    no
    Are
    Server-Roundtrips
    a problem?
    no Runtime
    Integration
    yes
    * an application is big enough to justify using micro frontends, if slight UI/UX
    differences between the two most unrelated subpages are acceptable.

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  45. @duffleit leitner.io
    Mix and Match
    Landing Shop Ordering
    hyperlink hyperlink



    APP SHELL
    Header
    Footer

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  46. @duffleit leitner.io
    Micro-Frontends are
    Distributed Systems.
    The Final Secret:

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  47. @duffleit leitner.io
    Everything that can
    go wrong will go wrong.
    The Final Secret:
    Murphy’s law

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  48. @duffleit leitner.io
    Think of starting with a
    monolithic first approach.

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  49. @duffleit leitner.io
    by: twitter.com/swardley

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  50. @duffleit leitner.io
    David Leitner
    Non-Hype-Train-Activist
    @duffleit

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