Comprehensive comparison for technology in applications

const express = require('express');
const StatsD = require('hot-shots');
const tracer = require('dd-trace').init({
  logInjection: true,
  analytics: true
});

const app = express();
app.use(express.json());

const dogstatsd = new StatsD({
  host: process.env.DD_AGENT_HOST || 'localhost',
  port: 8125,
  prefix: 'ecommerce.'
});

class OrderService {
  async processOrder(userId, items, paymentMethod) {
    const span = tracer.scope().active();
    span.setTag('user.id', userId);
    span.setTag('order.items_count', items.length);
    
    const startTime = Date.now();
    dogstatsd.increment('orders.attempted', 1, [`payment_method:${paymentMethod}`]);
    
    try {
      if (!items || items.length === 0) {
        throw new Error('Order must contain at least one item');
      }
      
      const totalAmount = items.reduce((sum, item) => sum + item.price * item.quantity, 0);
      span.setTag('order.total_amount', totalAmount);
      
      const paymentResult = await this.processPayment(userId, totalAmount, paymentMethod);
      
      if (!paymentResult.success) {
        dogstatsd.increment('orders.payment_failed', 1, [`reason:${paymentResult.error}`]);
        throw new Error(`Payment failed: ${paymentResult.error}`);
      }
      
      const order = {
        orderId: `ORD-${Date.now()}-${userId}`,
        userId,
        items,
        totalAmount,
        status: 'confirmed',
        createdAt: new Date()
      };
      
      dogstatsd.increment('orders.successful', 1, [`payment_method:${paymentMethod}`]);
      dogstatsd.histogram('orders.amount', totalAmount);
      dogstatsd.timing('orders.processing_time', Date.now() - startTime);
      
      return order;
    } catch (error) {
      span.setTag('error', true);
      span.setTag('error.message', error.message);
      dogstatsd.increment('orders.failed', 1, [`error:${error.message}`]);
      throw error;
    }
  }
  
  async processPayment(userId, amount, method) {
    return tracer.trace('payment.process', async (span) => {
      span.setTag('payment.amount', amount);
      span.setTag('payment.method', method);
      
      await new Promise(resolve => setTimeout(resolve, 100));
      
      if (amount > 10000) {
        return { success: false, error: 'amount_too_high' };
      }
      
      return { success: true, transactionId: `TXN-${Date.now()}` };
    });
  }
}

const orderService = new OrderService();

app.post('/api/orders', async (req, res) => {
  const { userId, items, paymentMethod } = req.body;
  
  try {
    const order = await orderService.processOrder(userId, items, paymentMethod);
    res.status(201).json({ success: true, order });
  } catch (error) {
    console.error('Order processing failed:', error);
    res.status(400).json({ success: false, error: error.message });
  }
});

app.listen(3000, () => {
  console.log('Order service listening on port 3000');
});