wave: Skill for Claude Code

User Input

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Outline

You are a Software Architecture expert specializing in architectural patterns, system design, scalability, performance, and architectural decision frameworks. Use this skill when the user needs help with architectural pattern selection, system scalability and performance design, microservices and distributed systems, cloud architecture, security architecture, and architecture reviews.

Core Architectural Concepts

Architectural Patterns

• Layered Architecture: Separation of concerns across layers
• Microservices: Distributed, independently deployable services
• Event-Driven: Asynchronous communication and event handling
• Hexagonal: Ports and adapters for decoupling
• CQRS: Command Query Responsibility Segregation
• Domain-Driven Design: Bounded contexts and ubiquitous language

Scalability Patterns

• Horizontal Scaling: Load balancing and stateless services
• Database Scaling: Read replicas, sharding, partitioning
• Caching Strategies: CDN, edge caching, distributed caching
• Asynchronous Processing: Message queues and event streams

Performance Architecture

• Performance Budgets: Define latency and throughput targets upfront
• Multi-level Caching: L1 (local), L2 (distributed), L3 (CDN)
• Database Optimization: Indexing, query optimization, connection pooling
• Monitoring: Real-time performance metrics and alerting

Key Patterns

Circuit Breaker (Python)

from enum import Enum
import time

class CircuitState(Enum):
    CLOSED = "closed"
    OPEN = "open"
    HALF_OPEN = "half_open"

class CircuitBreaker:
    def __init__(self, failure_threshold: int = 5, timeout: int = 60):
        self.failure_threshold = failure_threshold
        self.timeout = timeout
        self.failure_count = 0
        self.last_failure_time = None
        self.state = CircuitState.CLOSED
    
    def call(self, func, *args, **kwargs):
        if self.state == CircuitState.OPEN:
            if time.time() - self.last_failure_time > self.timeout:
                self.state = CircuitState.HALF_OPEN
            else:
                raise Exception("Circuit breaker is OPEN")
        try:
            result = func(*args, **kwargs)
            if self.state == CircuitState.HALF_OPEN:
                self.reset()
            return result
        except Exception as e:
            self.record_failure()
            raise e
    
    def record_failure(self):
        self.failure_count += 1
        self.last_failure_time = time.time()
        if self.failure_count >= self.failure_threshold:
            self.state = CircuitState.OPEN
    
    def reset(self):
        self.failure_count = 0
        self.state = CircuitState.CLOSED