Sequence diagrams (dua use cases) — PlantUML Use case A — Student enroll course (Daftar/Mendaftar mata kuliah)Class diagram (PlantUML)

[taufik054-jpg]

@startuml
actor Student
participant "Web Frontend" as FE
participant "API Gateway" as AG
participant "Course Service" as CS
participant "Auth Service" as AS
participant "Enrollment Service" as ES
participant "DB (Enrollment)" as EDB

Student -> FE: klik "Enroll"
FE -> AG: POST /courses/{id}/enroll (token)
AG -> AS: verify token
AS --> AG: OK (userId)
AG -> ES: CreateEnrollment(userId, courseId)
ES -> EDB: INSERT enrollment
EDB --> ES: success
ES -> CS: NotifyEnrollment(userId, courseId) [async/event]
CS --> ES: ack
ES --> AG: 201 Created
AG --> FE: 201 Created
FE --> Student: tampilkan konfirmasi
@enduml

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