Integration Best Practices

Design Principles

1. Reliability

reliable-connector.ts

class ReliableConnector {
    private retryCount: number = 0;
    private maxRetries: number = 3;
    
    async processWithRetry(fn: () => Promise<void>) {
        while (this.retryCount < this.maxRetries) {
            try {
                await fn();
                this.retryCount = 0;
                return;
            } catch (error) {
                this.retryCount++;
                await this.exponentialBackoff();
            }
        }
        throw new Error('Max retries exceeded');
    }
    
    private async exponentialBackoff() {
        const delay = Math.pow(2, this.retryCount) * 1000;
        await new Promise(resolve => setTimeout(resolve, delay));
    }
}

2. Scalability

• Use batch processing
• Implement proper caching
• Design for horizontal scaling
• Monitor resource usage

3. Maintainability

• Follow code standards
• Document thoroughly
• Use version control
• Implement monitoring

Common Patterns

1. Event Processing

event_processor.go

type EventProcessor struct {
    eventCache *lru.Cache
    handlers   map[string]EventHandler
}

func (p *EventProcessor) ProcessEvent(event Event) error {
    // Deduplication
    if p.eventCache.Contains(event.ID) {
        return nil
    }
    
    // Process event
    handler := p.handlers[event.Type]
    if err := handler.Handle(event); err != nil {
        return err
    }
    
    // Cache event
    p.eventCache.Add(event.ID, true)
    return nil
}

2. State Management

state-manager.ts

class StateManager {
    private state: Map<string, any> = new Map();
    
    async getState(key: string): Promise<any> {
        if (!this.state.has(key)) {
            const value = await this.loadFromStorage(key);
            this.state.set(key, value);
        }
        return this.state.get(key);
    }
    
    async setState(key: string, value: any): Promise<void> {
        this.state.set(key, value);
        await this.saveToStorage(key, value);
    }
}

Error Handling

1. Categorize Errors

error-types.ts

enum ErrorType {
    TEMPORARY,
    PERMANENT,
    RATE_LIMIT,
    VALIDATION
}

class ConnectorError extends Error {
    constructor(
        message: string,
        public type: ErrorType,
        public retryable: boolean
    ) {
        super(message);
    }
}

2. Error Recovery

error-recovery.ts

class ErrorRecovery {
    async handleError(error: ConnectorError): Promise<void> {
        switch (error.type) {
            case ErrorType.TEMPORARY:
                await this.handleTemporaryError(error);
                break;
            case ErrorType.RATE_LIMIT:
                await this.handleRateLimit(error);
                break;
            case ErrorType.VALIDATION:
                await this.handleValidationError(error);
                break;
            default:
                throw error;
        }
    }
}

Performance Optimization

1. Batch Processing

batch-processor.ts

class BatchProcessor<T> {
    private batch: T[] = [];
    private batchSize: number;
    
    async add(item: T) {
        this.batch.push(item);
        
        if (this.batch.length >= this.batchSize) {
            await this.processBatch();
        }
    }
    
    private async processBatch() {
        const items = [...this.batch];
        this.batch = [];
        await this.processBatchItems(items);
    }
}

2. Caching

cache-manager.ts

class CacheManager {
    private cache: Map<string, {
        value: any;
        timestamp: number;
    }> = new Map();
    
    async get(key: string, ttl: number): Promise<any> {
        const cached = this.cache.get(key);
        
        if (cached && Date.now() - cached.timestamp < ttl) {
            return cached.value;
        }
        
        const value = await this.fetchValue(key);
        this.cache.set(key, {
            value,
            timestamp: Date.now()
        });
        
        return value;
    }
}

Monitoring and Logging

1. Metrics Collection

metrics.ts

class MetricsCollector {
    private metrics: Map<string, number> = new Map();
    
    increment(metric: string, value: number = 1) {
        const current = this.metrics.get(metric) ?? 0;
        this.metrics.set(metric, current + value);
    }
    
    async reportMetrics() {
        // Report metrics to monitoring system
    }
}

2. Structured Logging

logger.ts

class Logger {
    log(level: string, message: string, context: Record<string, any>) {
        const entry = {
            timestamp: new Date().toISOString(),
            level,
            message,
            ...context
        };
        
        console.log(JSON.stringify(entry));
    }
}

Security Considerations

1. API Key Management

   • Use environment variables
   • Rotate keys regularly
   • Implement proper access controls

2. Data Validation

   • Validate all inputs
   • Sanitize data
   • Implement rate limiting

3. Error Handling

   • Don't expose sensitive information
   • Log security events
   • Implement proper shutdown procedures

Testing

connector.test.ts

describe('Connector', () => {
    let connector: Connector;
    
    beforeEach(() => {
        connector = new Connector({
            // Test configuration
        });