# Microservices --- #### Monolith  <!-- .element: class="fragment fade-in" --> --- #### Microservice  <!-- .element: class="fragment fade-in" --> ---- * Aufbau aus separaten Applikationen <!-- .element: class="fragment fade-in" --> * Architektur <!-- .element: class="fragment fade-in" --> * Techstack <!-- .element: class="fragment fade-in" --> * Datenbank <!-- .element: class="fragment fade-in" -->  <!-- .element: class="fragment fade-in" --> --- #### Kommunikation - Monolith  <!-- .element: class="fragment fade-in" --> ---- #### Kommunikation - Microservice  <!-- .element: class="fragment fade-in" --> Error beim Speichern? <!-- .element: class="fragment fade-in" --> <div class="fragment fade-in"> <p class="fragment strike">Rollback!</p> </div> ---- #### Saga  <!-- .element: class="fragment fade-in" --> ```python try: for service in services: service() confirm_transaction() except: compensate(services) ``` <!-- .element: class="fragment fade-in" --> --- #### Gateway  <!-- .element: class="fragment fade-in" --> ```python if req.path.like('/catalog/**'): return requests.get("http://23.235.12.56:4675/**") ``` <!-- .element: class="fragment fade-in" --> ---- #### Eureka 23.235.12.56:4675? <!-- .element: class="fragment fade-in-then-semi-out" -->  <!-- .element: class="fragment fade-in" style="height:55vh"--> ```python if req.path.like('/catalog/**'): return requests.get("lb://catalog-service/**") ``` <!-- .element: class="fragment fade-in" --> --- #### Showdown <table> <thead> <tr> <th>Area</th> <th>Monolith</th> <th>Microservices</th> </tr> </thead> <tbody> <tr class="fragment fade-in"> <td>Development</td> <td align="center">👎</td> <td align="center">👍</td> </tr> <tr class="fragment fade-in"> <td>SRP</td> <td align="center">👎</td> <td align="center">👍</td> </tr> <tr class="fragment fade-in"> <td>Komplexität</td> <td align="center">👍</td> <td align="center">👎</td> </tr> <tr class="fragment fade-in"> <td>Cross-Cutting</td> <td align="center">👍</td> <td align="center">🤔</td> </tr> <tr class="fragment fade-in"> <td>Flexibilität</td> <td align="center">👎</td> <td align="center">👍</td> </tr> <tr class="fragment fade-in"> <td>Testing</td> <td align="center">👍</td> <td align="center">🤔</td> </tr> <tr class="fragment fade-in"> <td>Deployment</td> <td align="center">👍</td> <td align="center">🤔</td> </tr> <tr class="fragment fade-in"> <td>Scaling</td> <td align="center">👎</td> <td align="center">👍</td> </tr> </tbody> </table> note: * Development einzelner Services bequemer * Flexibilität in Techstack * Scaling bei Monolith nur als Ganzes