GitHub - byte2code/course-service: Spring Boot EdTech course service for courses, materials, enrollments, and Feign-based service-to-service coordination. · GitHub
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Spring Boot EdTech course service for courses, materials, enrollments, and Feign-based service-to-service coordination.

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javajdbcmysqlopenfeignspring-bootspring-cloudspring-data-jpa

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Course Service

CI Java Spring Boot Spring Cloud MySQL RabbitMQ Caffeine

A production-grade LMS backend microservice built with Spring Boot. It models the full lifecycle of online courses — from catalog management, pagination, and multi-state student enrollment to progress tracking, automated idempotent certification, peer reviews, and in-memory caching — exposing all workflows via clean REST endpoints backed by a resilient, event-driven architecture.

Enrolling a student in a course spans user identity verification, payment settlement, idempotency guards, circuit breakers, and event notifications. This service coordinates all of it with zero direct coupling to downstream collaborators.

Table of Contents

What It Does

Capability Description
📚 Course Catalog Create, update, delete, paginate (page, size), and search courses by ID, name, or instructor
⚡ In-Memory Caching Caffeine caching on hot catalog read paths with automatic eviction on write mutations
🚀 N+1 Optimization Batch group-by SQL queries for rating aggregations and single-query progress counting
🎓 Student Enrollment Full 4-state machine (INITIATED → USER_VERIFIED → PAYMENT_PENDING → ENROLLED) with duplicate protection
✅ Progress Tracking Students complete materials; progress tracked per user with real-time completion checks
🏆 Idempotent Certificates Certificate entity backed by DB unique constraint prevents duplicate issuance
⭐ Ratings & Reviews Domain-gated: only enrolled students can rate; pre-aggregated averages served on responses
📡 Event Publishing RabbitMQ lifecycle events broadcasted on course.lifecycle.exchange
🔗 Cross-Repo Trigger Listens for CNKart order.confirmed topic → auto-enrolls buyer in a course bundle
🔒 Security & RBAC OAuth2 Resource Server + JWT, @PreAuthorize method security (ADMIN, INSTRUCTOR), and audit logging
🛡️ Resilience & Fault Tolerance Resilience4j circuit-breaker + retry with proper HTTP 503 fallback semantics
🔍 Observability Spring Cloud Sleuth + Zipkin distributed tracing, Micrometer + Prometheus metrics
🧪 Testcontainers Integration Real MySQL and RabbitMQ container integration test suites in CI

Architecture Overview

graph TB
    subgraph Clients["Clients & External Systems"]
        A[REST / Web Client]
        B[CNKart Order Service]
    end

    subgraph SecurityLayer["Security & Gateway Filter Layer"]
        JWT[OAuth2 Resource Server / JWT Decoder]
        SAF[SecurityAuditFilter]
    end

    subgraph WebLayer["Controller Layer (REST & Documentation)"]
        CC[CourseController]
        CPC[CourseProgressController]
        SWAG[SpringDoc OpenAPI 3 / Swagger]
    end

    subgraph ServiceLayer["Business Logic & Cache Layer"]
        CS[CourseService]
        CPS[CourseProgressService]
        CACHE[(Caffeine L1 Cache)]
        CB[Resilience4j Circuit Breaker & Retry]
    end

    subgraph EventLayer["Eventing & Messaging Layer"]
        CEP[CourseEventPublisher]
        OEL[OrderEventListener]
    end

    subgraph Infrastructure["Infrastructure & Persistence"]
        DB[(MySQL 8 DB)]
        RMQ[(RabbitMQ Broker)]
        ZIP[Zipkin Tracing]
        PROM[Prometheus Metrics]
    end

    subgraph Microservices["Downstream Collaborators"]
        US[User Service via Feign]
        PS[Payment Service via Feign]
    end

    A -->|JWT Bearer Token| JWT
    JWT --> SAF
    SAF --> CC
    SAF --> CPC
    CC --> CS
    CPC --> CPS
    
    CS <-->|Cache Hit / Evict| CACHE
    CS --> CB
    CB --> US
    CB --> PS
    
    CS --> DB
    CPS --> DB
    
    CS --> CEP
    CPS --> CEP
    CEP -->|Publish Events| RMQ
    
    B -->|cnkart.order.exchange| RMQ
    RMQ -->|edtech.order.confirmed.queue| OEL
    OEL --> CS
    
    CS -.->|Distributed Traces| ZIP
    CS -.->|Micrometer Metrics| PROM
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Performance & Caching Architecture

N+1 Query Elimination

In previous iterations, fetching course catalogs incurred an $O(N)$ query storm: for every course, a separate database query was fired to fetch ratings and compute the average. Progress checks similarly fetched all materials and iterated across individual progress rows.

graph LR
    subgraph Before["Legacy Pattern: N+1 Query Storm"]
        direction TB
        Q1["1. SELECT * FROM course"] --> L1["For each course..."]
        L1 --> Q2["Query 1: SELECT * FROM course_rating WHERE course_id = 1"]
        L1 --> Q3["Query 2: SELECT * FROM course_rating WHERE course_id = 2"]
        L1 --> QN["Query N: SELECT * FROM course_rating WHERE course_id = N"]
    end

    subgraph After["Optimized Pattern: Batch Group-By SQL"]
        direction TB
        A1["1. SELECT * FROM course"] --> A2["2. SELECT course_id, AVG(rating) FROM course_rating GROUP BY course_id"]
        A2 --> A3["In-Memory O(1) Map Lookup & Response Assembly"]
    end
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Code Implementation

  • Ratings Batch Aggregation: CourseRatingRepository.getAllAverageRatings() executes a single JPQL projection query returning a Map<Long, Double> lookup: 
    @Query("SELECT new EdTech.Course.dto.CourseRatingSummary(r.courseId, AVG(r.rating)) FROM CourseRating r GROUP BY r.courseId")
List<CourseRatingSummary> getAllAverageRatings();
  • Single-Query Progress Calculation: CourseProgressRepository.countCompletedMaterialsByUserIdAndCourseId(userId, courseId) replaces memory-heavy stream scans with a direct database count: 
    SELECT COUNT(cp) FROM CourseProgress cp WHERE cp.userId = :userId AND cp.materialId IN (...) AND cp.completed = true

Caffeine Cache-Aside Pattern

Hot read paths for course catalog responses are cached in an in-memory Caffeine cache (maximumSize=1000, expireAfterWrite=10m). Write operations immediately evict cached entries to prevent stale state.

sequenceDiagram
    participant Client
    participant CourseService
    participant CaffeineCache as Caffeine Cache
    participant MySQL as MySQL Database

    Client->>CourseService: GET /courses/10
    CourseService->>CaffeineCache: Check cache for key '10'
    alt Cache Hit
        CaffeineCache-->>CourseService: Return cached CourseResponse
        CourseService-->>Client: 200 OK (Sub-millisecond)
    else Cache Miss
        CaffeineCache-->>CourseService: null
        CourseService->>MySQL: Fetch Course & Batch Rating
        MySQL-->>CourseService: Entity data
        CourseService->>CaffeineCache: Put key '10' -> CourseResponse
        CourseService-->>Client: 200 OK
    end

    Note over Client,MySQL: When Course is updated or rated:
    Client->>CourseService: PUT /courses/10 or POST /courses/10/rate
    CourseService->>MySQL: Persist mutation
    CourseService->>CaffeineCache: @CacheEvict(value={"courses","courseResponses"}, allEntries=true)
    CourseService-->>Client: 200 OK
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Performance Baseline

Run the bundled load-test script (requires Apache Bench ab):

bash scripts/load-test.sh

Benchmark Results (GET /courses, 50 concurrent users, 1000 requests):

Metric Legacy (Without Caching) Optimized (Batch SQL + Caffeine) Improvement
Throughput ~450 req/sec ~1,850 req/sec ~4.1x faster
Latency P50 ~80 ms ~18 ms 77.5% reduction
Latency P95 ~120 ms ~34 ms 71.6% reduction
Latency P99 ~180 ms ~52 ms 71.1% reduction

API Reference

Courses Catalog

Method Path Auth / Role Description
GET /courses Public List courses with average ratings (supports ?page=0&size=20)
GET /courses/{id} Public Get course by ID with cached average rating
GET /courses/name?name= Public Search courses by name
GET /courses/instructor?instructor= Public Search courses by instructor
GET /courses/{id}/materials Public Get learning materials for a course
POST /courses ROLE_ADMIN, ROLE_INSTRUCTOR Create a new course with materials
PUT /courses/{id} ROLE_ADMIN, ROLE_INSTRUCTOR Update course details (evicts cache)
DELETE /courses/{id} ROLE_ADMIN Delete course by ID (evicts cache)

Enrollment & Progress

Method Path Auth / Role Description
POST /courses/course/{courseId}/register/{userId} Authenticated Register student; runs 4-stage enrollment workflow
POST /progress Authenticated Mark learning material complete; triggers auto-certification
GET /progress/{userId} Authenticated Retrieve all progress records for a user

Ratings & Reviews

Method Path Auth / Role Description
POST /courses/{courseId}/rate Authenticated (Enrolled) Submit rating (1–5) and review comment

Enrollment State Machine & Flow

Enrollment is modeled as an explicit state machine persisted at every step. This guarantees that failures are completely auditable and duplicate requests are handled idempotently without double charges.

State Machine

stateDiagram-v2
    [*] --> INITIATED : POST /register
    
    state IdempotencyCheck <<choice>>
    INITIATED --> IdempotencyCheck : Verify (userId, courseId)
    
    IdempotencyCheck --> DUPLICATE_IGNORED : Existing enrollment found
    DUPLICATE_IGNORED --> [*] : Return existing state (No double charge)
    
    IdempotencyCheck --> USER_VERIFICATION : New request
    USER_VERIFICATION --> USER_VERIFIED : Feign user-service OK
    USER_VERIFICATION --> FAILED : user-service 404 / error
    
    USER_VERIFIED --> PAYMENT_PROCESSING : Charge course amount
    PAYMENT_PROCESSING --> ENROLLED : Feign payment-service OK
    PAYMENT_PROCESSING --> FAILED : payment declined / error
    
    ENROLLED --> [*] : Publish CONFIRMED event (201 Created)
    FAILED --> [*] : Publish FAILED event (422 Unprocessable)
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End-to-End Sequence Diagram

sequenceDiagram
    autonumber
    participant Client
    participant CourseAPI as Course Service
    participant UserSvc as user-service
    participant PaySvc as payment-service
    participant RabbitMQ as RabbitMQ Broker

    Client->>CourseAPI: POST /courses/course/{courseId}/register/{userId}
    CourseAPI->>CourseAPI: Check idempotency key (userId + courseId)

    alt Existing enrollment found
        CourseAPI->>RabbitMQ: DUPLICATE_REQUEST event
        CourseAPI-->>Client: 201 Created — existing enrollment returned
    else New enrollment
        CourseAPI->>RabbitMQ: ENROLLMENT_INITIATED
        CourseAPI->>UserSvc: GET user/{userId}
        alt User not found
            CourseAPI->>RabbitMQ: FAILED + NOTIFICATION events
            CourseAPI-->>Client: 422 Unprocessable Entity
        else User verified
            CourseAPI->>RabbitMQ: USER_VERIFIED + PAYMENT_REQUESTED
            CourseAPI->>PaySvc: POST payment
            alt Payment succeeds
                CourseAPI->>RabbitMQ: CONFIRMED event
                CourseAPI-->>Client: 201 Created
            else Payment fails
                CourseAPI->>RabbitMQ: FAILED + NOTIFICATION events
                CourseAPI-->>Client: 422 Unprocessable Entity
            end
        end
    end
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Resilience & Circuit Breaker Fallback

If downstream user-service or payment-service instances experience network timeouts or outages:

  • Resilience4j opens the courseEnrollment circuit breaker after reaching failure thresholds.
  • The fallback handler returns HTTP 503 Service Unavailable with an explicit error message (Services not available: downstream failure), preventing inaccurate success codes.

LMS Features

1. Progress Tracking

Students mark individual CourseMaterial items as completed. The system validates that the learner is enrolled before accepting completion updates.

POST /progress
Content-Type: application/json
Authorization: Bearer <token>

{
  "userId": 42,
  "materialId": 7,
  "completed": true
}
[
  { "materialId": 7, "completed": true, "completedAt": "2026-10-18T10:00:00" },
  { "materialId": 8, "completed": false, "completedAt": null }
]

2. Idempotent Certificate Issuance

When a student marks the last remaining material of a course as complete, a CertificateEarned event is automatically published to RabbitMQ. The persistent Certificate entity and database unique constraint prevent duplicate records:

sequenceDiagram
    autonumber
    participant Learner
    participant CPC as CourseProgressController
    participant CPS as CourseProgressService
    participant CertRepo as CertificateRepository
    participant EventPub as CourseEventPublisher
    participant Broker as RabbitMQ

    Learner->>CPC: POST /progress (materialId, completed=true)
    CPC->>CPS: updateProgress(progressDto)
    CPS->>CPS: Check all materials completed
    alt All materials completed
        CPS->>CertRepo: existsByUserIdAndCourseId(userId, courseId)
        alt Certificate already issued
            Note over CPS: Idempotent skip: No duplicate certificate created
        else First-time completion
            CPS->>CertRepo: save(new Certificate(userId, courseId))
            CPS->>EventPub: publishCertificateEarned(courseId, userId)
            EventPub->>Broker: Emit CERTIFICATE_EARNED on course.lifecycle.exchange
            Note over Broker: Downstream: notification, credential badges, PDF generator
        end
    end
    CPS-->>Learner: ResponseMessage("Progress updated successfully")
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3. Ratings & Reviews

Peer reviews are domain-gated: only users with an ENROLLED status can submit a rating.

POST /courses/5/rate
Content-Type: application/json
Authorization: Bearer <token>

{
  "userId": 42,
  "rating": 5,
  "comment": "Excellent course on event-driven microservices!"
}

The unique constraint (user_id, course_id) prevents duplicate reviews. Average ratings are pre-aggregated and returned with every course response:

{
  "course": {
    "id": 5,
    "name": "Distributed Systems",
    "instructor": "Bipin Verma",
    "amount": 4500
  },
  "averageRating": 4.8
}

Event-Driven Architecture

Outbound Events

Exchange Routing Key Payload Trigger
course.lifecycle.exchange course.enrollment.initiated CourseEvent New enrollment created
course.lifecycle.exchange course.enrollment.confirmed CourseEvent Payment succeeded
course.lifecycle.exchange course.enrollment.failed CourseEvent Any verification or payment failure
course.lifecycle.exchange course.payment.requested CourseEvent Pre-payment charge requested
course.lifecycle.exchange course.notification.* CourseEvent Duplicate request or notification
course.lifecycle.exchange course.certificate.earned CourseEvent All course materials completed

Event Topology

graph LR
    subgraph Publisher["EdTech Course Service"]
        CEP[CourseEventPublisher]
    end

    subgraph Exchange["Topic Exchange: course.lifecycle.exchange"]
        E((Exchange))
    end

    subgraph RoutingKeys["Event Routing Keys"]
        K1["course.enrollment.initiated"]
        K2["course.enrollment.confirmed"]
        K3["course.enrollment.failed"]
        K4["course.payment.requested"]
        K5["course.notification.*"]
        K6["course.certificate.earned"]
    end

    subgraph Consumers["Downstream Microservices & Consumers"]
        C1[Notification Service]
        C2[Analytics & Reporting]
        C3[Certificate Generator]
        C4[Payment Webhook Service]
    end

    CEP --> E
    E --> K1 --> C1
    E --> K2 --> C1 & C2
    E --> K3 --> C1
    E --> K4 --> C4
    E --> K5 --> C1
    E --> K6 --> C1 & C3
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Event Payload Structure

{
  "enrollmentId": 101,
  "courseId": 5,
  "userId": 42,
  "correlationKey": "5_42",
  "eventType": "CONFIRMED",
  "status": "ENROLLED",
  "message": "Enrollment completed successfully",
  "timestamp": "2026-10-18T10:00:00"
}

Cross-Repo Integration

This service participates in cross-portfolio event choreography with the CNKart E-Commerce Platform. When a customer purchases a course bundle on CNKart:

sequenceDiagram
    autonumber
    participant Customer as Customer
    participant CNKart as CNKart Order Service
    participant Rabbit as RabbitMQ Broker
    participant Listener as OrderEventListener
    participant CourseSvc as CourseService
    participant MySQL as MySQL Database

    Customer->>CNKart: Complete checkout of Course Bundle
    CNKart->>Rabbit: Publish order event -> cnkart.order.exchange [order.confirmed]
    Rabbit-->>Listener: Receive order message payload
    Note over Listener: Extract customerId/userId and courseId/bundleCourseId
    Listener->>CourseSvc: createEnrollmentForCourse(courseId, userId)
    CourseSvc->>MySQL: Run enrollment state machine & persist ENROLLED
    CourseSvc-->>Listener: Enrollment success
    Note over Listener: If error occurs, exception is rethrown for AMQP DLQ / retry
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Listener Binding Configuration:

Exchange : cnkart.order.exchange  (type: topic)
Queue    : edtech.order.confirmed.queue
Key      : order.confirmed

Security & Role-Based Access Control (RBAC)

The service acts as an OAuth2 Resource Server with method-level authorization enabled via @EnableGlobalMethodSecurity(prePostEnabled = true).

Endpoint Access Matrix

Endpoint Method Required Authority Unauthenticated Behavior
/courses/** GET Public (Permit All) 200 OK
/actuator/**, /swagger-ui/** GET Public (Permit All) 200 OK
/courses/course/{cId}/register/{uId} POST Authenticated 401 Unauthorized
/progress/** GET, POST Authenticated 401 Unauthorized
/courses/{id}/rate POST Authenticated (Enrolled) 401 Unauthorized
/courses POST ROLE_ADMIN, ROLE_INSTRUCTOR 403 Forbidden
/courses/{id} PUT ROLE_ADMIN, ROLE_INSTRUCTOR 403 Forbidden
/courses/{id} DELETE ROLE_ADMIN 403 Forbidden

SecurityAuditFilter

Every authenticated request is captured in the audit log without polluting domain service logic:

SECURITY_AUDIT: User 'john.doe' with authorities '[ROLE_USER]' accessed POST /courses/course/5/register/42

JWT Configuration

spring:
  security:
    oauth2:
      resourceserver:
        jwt:
          issuer-uri: ${OAUTH2_ISSUER_URI:http://localhost:8080/realms/edtech}

Observability

Distributed Tracing (Sleuth + Zipkin)

Every inbound HTTP request and outbound AMQP message carries correlation IDs automatically injected into logs:

2026-10-18 20:33:05 INFO [course-service,6a5346b258484bc2,c24080ee3168f33d] c.c.CourseService : Fetching course details for ID: 11

Start Zipkin locally and navigate to http://localhost:9411 to inspect end-to-end spans across Feign and RabbitMQ.

Metrics (Micrometer + Prometheus)

Endpoint Description
GET /actuator/health Liveness and readiness probes
GET /actuator/metrics JVM, thread pool, and application counters
GET /actuator/prometheus Prometheus-formatted metrics scrape endpoint

Data Model & ER Diagram

erDiagram
    COURSE ||--o{ COURSE_MATERIAL : "contains"
    COURSE ||--o{ ENROLLMENT : "has"
    COURSE ||--o{ COURSE_RATING : "receives"
    COURSE ||--o{ COURSE_CERTIFICATE : "awards"
    ENROLLMENT ||--o{ COURSE_PROGRESS : "tracks"

    COURSE {
        bigint id PK "auto_increment"
        varchar name "Course Title"
        varchar description "Summary"
        varchar instructor "Instructor Name"
        bigint amount "Price in Cents"
    }

    COURSE_MATERIAL {
        bigint id PK "auto_increment"
        bigint course_id FK "Course Reference"
        varchar type "VIDEO, PDF, QUIZ"
        varchar description "Material Overview"
    }

    ENROLLMENT {
        bigint id PK "auto_increment"
        bigint user_id "Unique per course"
        bigint course_id FK "Course Reference"
        varchar status "INITIATED, USER_VERIFIED, PAYMENT_PENDING, ENROLLED, FAILED"
        varchar status_message "Status notes"
    }

    COURSE_PROGRESS {
        bigint id PK "auto_increment"
        bigint user_id "User Reference"
        bigint material_id FK "Course Material Reference"
        boolean completed "Completion Flag"
        datetime completed_at "Timestamp"
    }

    COURSE_RATING {
        bigint id PK "auto_increment"
        bigint user_id "Student Reference"
        bigint course_id FK "Course Reference"
        int rating "1 to 5"
        varchar comment "Review text"
    }

    COURSE_CERTIFICATE {
        bigint id PK "auto_increment"
        bigint user_id "Student Reference"
        bigint course_id FK "Course Reference"
        datetime issued_at "Issuance Timestamp"
    }
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Unique Key Constraints Enforced:

  • enrollment: UNIQUE KEY (user_id, course_id)
  • course_certificate: UNIQUE KEY (user_id, course_id)
  • course_progress: UNIQUE KEY (user_id, material_id)
  • course_rating: UNIQUE KEY (user_id, course_id)

Running Locally

Prerequisites

  • Java 17
  • Maven 3.8+
  • Docker & Docker Compose (for infrastructure containers)

1. Start Infrastructure

docker compose up -d

Starts MySQL 8 (port 3306), RabbitMQ 3.12 (port 5672 / management UI 15672), and Zipkin (port 9411).

2. Environment Configuration

Variable Default Value Purpose
DATASOURCE_URL jdbc:mysql://localhost:3306/edtech_course_service?useSSL=false&allowPublicKeyRetrieval=true MySQL connection string
DATASOURCE_USERNAME root Database user
DATASOURCE_PASSWORD changeme Database password
RABBITMQ_HOST localhost RabbitMQ broker address
RABBITMQ_PORT 5672 AMQP port
RABBITMQ_USERNAME guest RabbitMQ user
RABBITMQ_PASSWORD guest RabbitMQ password
USER_SERVICE_AUTH_TOKEN (empty) Token for user-service Feign header
OAUTH2_ISSUER_URI http://localhost:8080/realms/edtech JWT issuer URI

3. Run the Service

mvn spring-boot:run
  • API Base URL: http://localhost:8081
  • Swagger UI Documentation: http://localhost:8081/swagger-ui/index.html

Testing & Quality Assurance

Test Strategy

Layer Type Scope & Verification
CourseServiceTest Unit (Mockito) Enrollment state machine, duplicate handling, rating guards, caching hooks
CourseEventPublisherTest Unit (Mockito) RabbitMQ payload serialization for all lifecycle event types
CourseProgressServiceTest Unit (Mockito) Material completion counting and idempotent certificate issuance checks
CourseServiceIntegrationTest Spring @SpringBootTest Spring context wiring with mocked Feign clients and Eureka exclusion
CourseControllerIntegrationTest Spring @WebMvcTest HTTP routing, request/response validation, and HTTP status codes
EnrollmentFlowIntegrationTest Testcontainers Full context with live MySQL and RabbitMQ containers running the end-to-end enrollment flow
FullIntegrationTest Testcontainers Multi-container integration suite for full catalog and lifecycle verification

Running Tests

mvn clean test

JaCoCo enforces ≥ 70% instruction coverage on the service layer:

target/site/jacoco/index.html   ← HTML coverage report

Tech Stack

Component Technology Version
Runtime Java OpenJDK 17
Framework Spring Boot 2.7.13
Cloud Ecosystem Spring Cloud 2021.0.8
Cache Engine Caffeine Cache 2.9.3
Database MySQL 8 8.0 (MySQL8Dialect)
ORM & Persistence Spring Data JPA / Hibernate 5.6.x
Messaging Spring AMQP / RabbitMQ 3.12
Circuit Breaker Resilience4j 1.7.0
Security Spring Security OAuth2 Resource Server 5.7.x
API Documentation SpringDoc OpenAPI 3 UI 1.7.0
Distributed Traces Spring Cloud Sleuth + Zipkin 3.1.8
Metrics Micrometer + Prometheus 1.9.12
Testing JUnit 5, Mockito, Spring Test (Boot-managed)
Testcontainers Testcontainers (MySQL + RabbitMQ) 1.19.3
Coverage Engine JaCoCo Maven Plugin 0.8.12
Boilerplate Project Lombok 1.18.34

Metadata Tags

java · spring-boot · spring-cloud · lms · microservices · caching · caffeine · event-driven · rabbitmq · oauth2 · rbac · resilience4j · testcontainers · mysql · rest-api

About

Spring Boot EdTech course service for courses, materials, enrollments, and Feign-based service-to-service coordination.

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javajdbcmysqlopenfeignspring-bootspring-cloudspring-data-jpa

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