Quick Reference & Decision Summary

🎯 Key Decisions at a Glance

Question	Decision	Document Reference
Language?	C# (.NET 8+)	04-LANGUAGE-PERFORMANCE.md
CDK or Terraform?	AWS CDK	00-PROJECT-HUB.md
Split or Unified?	Unified with layers	06-FRAMEWORK-ARCHITECTURE.md
Dynamic Config?	DynamoDB + Lambda	03-DYNAMIC-CONFIGURATION.md
Lambda Runtime?	.NET 8 Native AOT	04-LANGUAGE-PERFORMANCE.md
Design Patterns?	GOF + System Patterns	02-ARCHITECTURE-PATTERNS.md
Testing Framework?	xUnit	05-PROJECT-SETUP.md

📐 Architecture Layers

┌────────────────────────────────────┐
│   High-Level API (Public)         │ ← Users interact here
├────────────────────────────────────┤
│   Framework Core (Internal)       │ ← Implementation details
│   • Configuration Manager          │
│   • Infrastructure Provisioner     │
│   • Flow Builder                   │
├────────────────────────────────────┤
│   AWS Layer (L1 + SDK)            │ ← Direct AWS interaction
└────────────────────────────────────┘

🏗️ Design Patterns Used

Pattern	Purpose	Where Used
Builder	Fluent flow construction	FlowBuilder, QueueBuilder
Factory	Create actions/components	ActionFactory, FlowFactory
Strategy	Routing algorithms	RoutingStrategy
Decorator	Add cross-cutting concerns	Logging, Validation, Caching
Composite	Flow hierarchy	FlowModule, ContactFlow
Singleton	Configuration manager	ConfigManager
Observer	Config change notifications	ConfigChangeNotifier
Repository	Data access abstraction	ConfigRepository
Unit of Work	Transaction coordination	ConfigUnitOfWork
CQRS	Separate read/write	Commands vs Queries

💾 DynamoDB Tables

Table Name	Partition Key	Sort Key	Purpose
ConnectFlowConfigurations	flowId	version	Flow runtime config
ConnectQueueConfigurations	queueId	-	Queue settings
ConnectRoutingConfigurations	routingKey	conditionId	Routing rules
ConnectLoggingConfigurations	resourceType	resourceId	Logging config
ConnectFeatureFlags	featureName	environment	Feature toggles

⚡ Performance Benchmarks

Configuration	Cold Start	Warm Execution	Cost (1M invocations)
Node.js 20	287ms	12ms	$3.20
Python 3.12	412ms	18ms	$3.20
C# Traditional	1543ms	24ms	$4.50
C# Native AOT	398ms	21ms	$3.20
C# + Provisioned	0ms	24ms	$24.80

Recommendation: Use C# Native AOT for best balance of performance and cost.

🔄 Configuration Update Flow

Admin Updates Config in DynamoDB
        ↓
Cache Invalidation (Redis)
        ↓
Next Call to Connect
        ↓
Lambda Fetches Fresh Config
        ↓
Flow Executes with New Config
        ↓
✅ Zero Downtime

📦 Project Structure

amazon-connect-cdk-framework/
├── src/
│   ├── MyCompany.Connect.Framework/       # Main framework
│   │   ├── Core/                           # Orchestration
│   │   ├── Configuration/                  # DynamoDB config
│   │   ├── Infrastructure/                 # CDK constructs
│   │   ├── Flows/                          # Flow builder
│   │   └── Models/                         # Shared models
│   ├── MyCompany.Connect.Lambda.ConfigFetcher/
│   └── MyCompany.Connect.Deployment/       # CDK app
├── test/
│   ├── MyCompany.Connect.Framework.Tests/
│   └── MyCompany.Connect.Lambda.Tests/
└── examples/

🚀 Quick Start Commands

# Setup
dotnet new sln
dotnet new classlib -n Framework
dotnet new lambda.EmptyFunction -n ConfigFetcher
dotnet add package Amazon.CDK.Lib

# Build
dotnet build

# Test
dotnet test

# Deploy
cd src/Deployment
cdk synth
cdk deploy

# Lambda Native AOT
dotnet publish -c Release -r linux-x64 /p:PublishAot=true

🧪 Testing Strategy

Test Type	Purpose	Framework
Unit	Individual components	xUnit
Integration	CDK + DynamoDB	xUnit + Amazon.CDK.Assertions
Snapshot	CloudFormation templates	CDK Assertions
E2E	Complete workflows	LocalStack

Sample Unit Test

[Fact]
public void TestQueueCreation()
{
    var app = new App();
    var stack = new Stack(app, "test");
    var template = Template.FromStack(stack);
    
    template.ResourceCountIs("AWS::Connect::Queue", 1);
    template.HasResourceProperties("AWS::Connect::Queue", 
        new Dictionary<string, object>
        {
            { "MaxContacts", 50 }
        });
}

🔐 Security Checklist

• [x] DynamoDB encryption at rest with KMS
• [x] All API calls over HTTPS
• [x] Lambda in VPC private subnets
• [x] IAM least privilege roles
• [x] Secrets in AWS Secrets Manager
• [x] CloudTrail logging enabled
• [x] Input validation on all configs
• [x] No secrets in code or Git

💰 Cost Estimates

Monthly Infrastructure (medium call center):

• DynamoDB: $10-20
• Lambda: $5-15
• S3: $1-5
• ElastiCache (optional): $30-50
• Total: ~$50-90/month

Excludes Amazon Connect per-minute usage charges

📋 Implementation Phases

Phase	Duration	Focus
1. Foundation	Weeks 1-2	Models, setup, structure
2. Flow Builder	Weeks 3-4	Fluent interface, actions
3. CDK Constructs	Weeks 5-6	L2 wrappers, dependencies
4. Config Layer	Weeks 7-8	DynamoDB, Lambda, cache
5. Testing	Weeks 9-10	Comprehensive tests
6. Hardening	Weeks 11-12	Security, docs, examples

🎨 Code Style Conventions

// Namespaces
namespace MyCompany.Connect.Framework.Core;

// Public classes - PascalCase
public class ContactFlowBuilder { }

// Methods - PascalCase
public void AddAction() { }

// Properties - PascalCase
public string FlowName { get; set; }

// Private fields - _camelCase
private readonly string _flowId;

// Constants - PascalCase
public const int MaxActions = 250;

// Fluent interface - return this
public ContactFlowBuilder SetName(string name)
{
    _name = name;
    return this;
}

🔗 Essential Links

• AWS CDK: https://docs.aws.amazon.com/cdk/
• Amazon Connect API: https://docs.aws.amazon.com/connect/latest/APIReference/
• Flow Language: https://docs.aws.amazon.com/connect/latest/APIReference/flow-language.html
• .NET Lambda: https://docs.aws.amazon.com/lambda/latest/dg/csharp-handler.html
• Native AOT: https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot/

🆘 Common Issues & Solutions

Issue	Solution
CDK bootstrap fails	Check AWS credentials: aws sts get-caller-identity
Lambda cold starts too slow	Use Native AOT or provisioned concurrency
DynamoDB throttling	Increase provisioned capacity or use on-demand
Flow validation errors	Check action count (<250) and JSON structure
CDK synth timeout	Break into smaller stacks
Test failures	Run dotnet restore --force

🎓 Learning Resources

Start Here

1. Read 00-PROJECT-HUB.md - Overview
2. Follow 05-PROJECT-SETUP.md - Setup
3. Study 02-ARCHITECTURE-PATTERNS.md - Patterns

Deep Dives

• Dynamic Config: 03-DYNAMIC-CONFIGURATION.md
• Performance: 04-LANGUAGE-PERFORMANCE.md
• Architecture: 06-FRAMEWORK-ARCHITECTURE.md

📞 Getting Help

1. Check this quick reference
2. Search specific document
3. Review code examples
4. Check troubleshooting guide
5. Ask team/community

✅ Pre-Deployment Checklist

• [ ] All tests passing
• [ ] CDK synth succeeds
• [ ] Security review completed
• [ ] Cost estimates reviewed
• [ ] Documentation updated
• [ ] Examples working
• [ ] CI/CD pipeline tested
• [ ] Monitoring configured
• [ ] Rollback plan documented

🔄 Update Workflow

# Make code changes
# ↓
# Run tests
dotnet test
# ↓
# Check CDK diff
cdk diff
# ↓
# Deploy to dev
cdk deploy --profile dev
# ↓
# Verify in dev environment
# ↓
# Deploy to prod
cdk deploy --profile prod
# ↓
# Monitor metrics

🎯 Success Metrics

Metric	Target	Tracking
Test Coverage	>80%	dotnet test --collect:"XPlat Code Coverage"
Cold Start	<500ms	CloudWatch Logs
Config Fetch	<50ms	CloudWatch Metrics
Deployment Time	<5min	CI/CD pipeline
Documentation	100% public APIs	XML comments

💡 Pro Tips

1. Start Simple: Use high-level API first
2. Test Early: Write tests as you build
3. Cache Aggressively: Reduce DynamoDB reads
4. Monitor Always: CloudWatch dashboards
5. Version Everything: Git + semantic versioning
6. Document Decisions: ADRs in Notion
7. Review Regularly: Weekly progress checks
8. Refactor Ruthlessly: Keep code clean
9. Optimize Later: Make it work, then fast
10. Share Knowledge: Team demos and docs

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