PakLog WMS/WES System Documentation

Overview

PakLog is a modern Warehouse Management System (WMS) and Warehouse Execution System (WES) built with microservices architecture, Domain-Driven Design (DDD), and event-driven patterns. This documentation provides comprehensive technical details about the system architecture, implementation, and operations.

Documentation Structure

graph TB
    subgraph "Documentation Categories"
        ARCH[Architecture<br/>Diagrams]
        SEQ[Sequence<br/>Diagrams]
        DOMAIN[Domain<br/>Models]
        STATE[State<br/>Machines]
        DEPLOY[Deployment &<br/>Infrastructure]
        DATA[Data Flow &<br/>Integration]
        API[API<br/>Documentation]
    end

    ARCH --> C4[C4 Model]
    SEQ --> FLOWS[Business Flows]
    DOMAIN --> DDD[DDD Models]
    STATE --> FSM[State Transitions]
    DEPLOY --> K8S[Kubernetes]
    DATA --> ETL[ETL/Streaming]
    API --> REST[REST APIs]

📚 Documentation Index

1. Architecture Overview

Purpose: System architecture using C4 model Contents:

System Context (Level 1)
Container Architecture (Level 2)
Component Architecture (Level 3)
Deployment Architecture
Technology Stack Overview

Key Diagrams:

C4 Context, Container, Component diagrams
Deployment topology
Service communication matrix

2. Sequence Diagrams

Purpose: Detailed business flow interactions Contents:

Order Fulfillment Flow
Wave Planning and Release
Task Assignment Flow
Pick Execution Flow
Pack and Ship Flow
Inventory Movement
Error Handling & Compensation

Key Diagrams:

End-to-end order processing
Distributed saga patterns
Real-time monitoring flows

3. Domain Model Diagrams

Purpose: Domain-Driven Design models and relationships Contents:

Bounded Contexts
Aggregate Models
Entity Relationships
Value Objects
Domain Events

Key Models:

Wave Planning Domain
Task Execution Domain
Pick Execution Domain
Location Master Domain

4. State Machine Diagrams

Purpose: Entity lifecycle and state transitions Contents:

Wave Lifecycle
Task States
Pick Session States
Order States
Location States
Inventory States

Key Patterns:

State transition rules
Event triggers
Validation logic

5. Deployment & Infrastructure

Purpose: Infrastructure architecture and deployment patterns Contents:

Kubernetes Architecture
Network Architecture
Database Infrastructure
Message Queue Setup
Monitoring Stack
CI/CD Pipeline
Disaster Recovery
Security Architecture

Key Technologies:

Kubernetes/Docker
Kafka/Redis/MongoDB/PostgreSQL
Prometheus/Grafana
Service Mesh (Istio)

6. Data Flow & Integration

Purpose: Data processing and system integration patterns Contents:

End-to-End Data Flow
Event Flow Architecture
Integration Patterns
ETL/ELT Processes
Real-time Analytics
CQRS Implementation
Event Sourcing

Key Patterns:

Pub-Sub messaging
Stream processing
API Gateway patterns
External system integration

7. API Documentation

Purpose: Complete REST API specifications with examples Contents:

Authentication & Authorization
Wave Planning APIs
Task Execution APIs
Pick Execution APIs
Pack & Ship APIs
Location Master APIs
WebSocket APIs
Error Handling

Key Features:

OpenAPI 3.0 compatible
Request/Response examples
WebSocket real-time updates
Rate limiting & pagination

System Architecture Summary

C4Context
    title PakLog WMS/WES System Context

    Person(ops, "Operations", "Warehouse staff")
    Person(admin, "Admin", "System admin")

    System(paklog, "PakLog WMS/WES", "Warehouse Management")

    System_Ext(erp, "ERP", "Enterprise system")
    System_Ext(ecom, "E-Commerce", "Order source")
    System_Ext(tms, "TMS", "Transportation")

    Rel(ops, paklog, "Uses")
    Rel(admin, paklog, "Manages")
    Rel(ecom, paklog, "Orders")
    Rel(paklog, erp, "Syncs")
    Rel(paklog, tms, "Ships")

Technology Stack

Layer	Technology	Purpose
Language	Java 21	Primary development language
Framework	Spring Boot 3.2	Microservices framework
Messaging	Apache Kafka	Event streaming
Databases	MongoDB, PostgreSQL, Redis	Polyglot persistence
Container	Docker, Kubernetes	Container orchestration
Monitoring	Prometheus, Grafana	Observability
API Gateway	Spring Cloud Gateway	API routing
Service Mesh	Istio	Service communication

Service Catalog

WMS Services (Warehouse Management)

Wave Planning Service - Wave optimization and release
Location Master Service - Location and slotting management
Workload Planning Service - Resource and capacity planning

WES Services (Warehouse Execution)

Task Execution Service - Task orchestration and assignment
Pick Execution Service - Pick session management
Pack & Ship Service - Packing and shipping operations
Physical Tracking Service - Inventory and license plate tracking

Key Design Patterns

mindmap
  root((Design Patterns))
    Architecture
      Microservices
      Event-Driven
      Hexagonal
      CQRS
    Domain
      DDD
      Aggregates
      Value Objects
      Domain Events
    Integration
      Saga Pattern
      Event Sourcing
      Pub-Sub
      API Gateway
    Resilience
      Circuit Breaker
      Retry Logic
      Bulkhead
      Timeout

Quick Links

Development

Architecture

Operations

Getting Started

Prerequisites

Java 21
Maven 3.8+
Docker & Docker Compose
Kubernetes (for deployment)
MongoDB, PostgreSQL, Redis
Apache Kafka

Local Development Setup

# Clone repository
git clone https://github.com/paklog/paklog.git

# Start infrastructure
docker-compose up -d mongodb postgresql redis kafka

# Build services
mvn clean package

# Run a service
cd wave-planning-service
mvn spring-boot:run

API Testing

# Get access token
curl -X POST http://localhost:8080/oauth/token \
  -d "grant_type=client_credentials" \
  -d "client_id=test" \
  -d "client_secret=secret"

# Create a wave
curl -X POST http://localhost:8080/v1/waves \
  -H "Authorization: Bearer {token}" \
  -H "Content-Type: application/json" \
  -d '{"warehouseId": "WH001", "type": "STANDARD"}'

Documentation Statistics

Metric	Value
Total Documentation Files	8
Total Diagrams	50+
Mermaid Diagrams	45+
API Endpoints Documented	25+
Lines of Documentation	5,000+

Contributing

Please refer to our contribution guidelines for:

Code style standards
Testing requirements
Documentation updates
Pull request process

License

Support

Documentation Issues: Create issue in repository
Architecture Questions: architecture@paklog.com
API Support: api@paklog.com
Slack: #wms-wes-development

Last Updated: January 2024 Version: 1.0.0 Status: Production Ready