Legacy System Integration Troubleshooter

system_type: "Mainframe-based inventory management system from 1995 with terminal interface only, no APIs, requires daily data sync with modern e-commerce platform"

**SYSTEM:** Mainframe-based inventory management system from 1995 **PRIMARY BARRIERS:** Terminal-only interface, no REST APIs, session timeouts, fixed-width data formats, network latency sensitivity **INTEGRATION STRATEGY:** Implement terminal emulation layer using Python's pexpect library with robust session management. Create middleware API to translate modern REST calls to terminal commands. **TECHNICAL IMPLEMENTATION:** ```python import pexpect import time from dataclasses import dataclass class MainframeSession: def __init__(self, host, timeout=30): self.child = pexpect.spawn(f'tn3270 {host}') self.child.timeout = timeout def login_with_retry(self, user, password, max_attempts=3): for attempt in range(max_attempts): try: self.child.expect('Username:') self.child.sendline(user) return True except pexpect.TIMEOUT: self.reconnect() return False ``` **FALLBACK PLANS:** Screen scraping with OCR for corrupted terminal sessions, batch file processing during maintenance windows, manual intervention queue for critical failures **MONITORING & MAINTENANCE:** Implement heartbeat checks every 5 minutes, log all terminal interactions, set up alerts for session failures, weekly connection stability reports **ESTIMATED COMPLEXITY:** 6-8 weeks development, 2 weeks testing, requires dedicated server for terminal emulation **RISK MITIGATION:** Implement connection pooling, create data validation layers, establish rollback procedures for failed transactions