AWS Well-Architected Framework: The Six Pillars

// Well-Architected Framework overview
package com.bank.architecture;

import java.util.List;

public class WellArchitectedPillars {
    public static final List<String> PILLARS = List.of(
        "1. Operational Excellence",
        "2. Security",
        "3. Reliability",
        "4. Performance Efficiency",
        "5. Cost Optimization",
        "6. Sustainability"
    );

    public static void main(String[] args) {
        System.out.println("AWS Well-Architected Framework: 6 Pillars");
        PILLARS.forEach(System.out::println);
    }
}

// Operational Excellence: infrastructure as code
package com.bank.architecture;

public class OperationalExcellenceCheck {
    public static void audit() {
        System.out.println("OE-1: All infrastructure defined in CloudFormation/CDK? ");
        System.out.println("OE-2: CloudWatch dashboards for key business metrics? ");
        System.out.println("OE-3: Automated alarms and runbooks for common failures? ");
        System.out.println("OE-4: CI/CD pipeline with automated testing and rollback? ");
        System.out.println("OE-5: Post-incident reviews conducted and actions tracked? ");
    }
}

// Security pillar checklist
package com.bank.architecture;

public class SecurityPillarCheck {
    public static void audit() {
        System.out.println("SEC-1: IAM least privilege for all roles and policies? ");
        System.out.println("SEC-2: Encryption at rest (KMS) and in transit (TLS)? ");
        System.out.println("SEC-3: CloudTrail enabled in all regions? ");
        System.out.println("SEC-4: Security groups: no 0.0.0.0/0 on sensitive ports? ");
        System.out.println("SEC-5: Incident response plan documented and tested? ");
    }
}

// Reliability pillar checklist
package com.bank.architecture;

public class ReliabilityPillarCheck {
    public static void audit() {
        System.out.println("REL-1: Multi-AZ deployment for database and application? ");
        System.out.println("REL-2: Health checks with automatic replacement of unhealthy? ");
        System.out.println("REL-3: Automated backups with tested restoration procedure? ");
        System.out.println("REL-4: Auto-scaling configured for variable demand? ");
        System.out.println("REL-5: DR strategy defined and game-day tested? ");
    }
}

// Performance Efficiency checklist
package com.bank.architecture;

public class PerformanceEfficiencyCheck {
    public static void audit() {
        System.out.println("PE-1: Instance types selected based on workload profile? ");
        System.out.println("PE-2: Auto-scaling responding to actual demand metrics? ");
        System.out.println("PE-3: Database type matches access pattern (SQL vs NoSQL)? ");
        System.out.println("PE-4: CDN (CloudFront) for static content? ");
        System.out.println("PE-5: Load testing done before production launch? ");
    }
}

// Cost Optimization and Sustainability checklists
package com.bank.architecture;

public class CostAndSustainabilityCheck {
    public static void audit() {
        System.out.println("COST-1: Savings Plans for predictable baseline workloads? ");
        System.out.println("COST-2: Dev/test environments shut down nights and weekends? ");
        System.out.println("COST-3: All resources tagged for cost attribution? ");
        System.out.println("COST-4: Unattached EBS volumes and idle LBs cleaned up? ");
        System.out.println();
        System.out.println("SUS-1: Right-sized instances (not over-provisioned)? ");
        System.out.println("SUS-2: S3 lifecycle policies for aging data? ");
    }
}

// Self-assessment: score each pillar, surface the weakest
package com.bank.architecture;

import java.util.List;

public class WellArchitectedReview {
    record PillarScore(String pillar, int score, String topRisk) {}

    public static void main(String[] args) {
        List<PillarScore> review = List.of(
            new PillarScore("Reliability", 2, "Single-AZ RDS, no failover"),
            new PillarScore("Security", 4, "Block Public Access enabled"),
            new PillarScore("Cost Optimization", 2, "No cost tags, idle envs running 24/7"),
            new PillarScore("Operational Excellence", 3, "Missing runbooks for top failures"),
            new PillarScore("Performance Efficiency", 4, "Auto-scaling configured"),
            new PillarScore("Sustainability", 3, "No lifecycle policies yet")
        );
        System.out.println("Well-Architected Review Results:");
        review.forEach(p -> System.out.println(
            "  " + p.pillar() + ": " + p.score() + "/5 - Risk: " + p.topRisk()));
    }
}

// Using the Well-Architected Tool
package com.bank.architecture;

public class WellArchitectedToolUsage {
    public static void main(String[] args) {
        System.out.println("1. Create a workload in the WA Tool");
        System.out.println("2. Answer questions for each of the 6 pillars");
        System.out.println("3. Tool identifies HRI (high risk) and MRI (medium risk) items");
        System.out.println("4. Generate improvement plan with milestones");
        System.out.println("5. Track remediation to closure");
        System.out.println("6. Re-review periodically as architecture evolves");
    }
}