Software Design

Movie Seat Selection with Lock Timeout

Use Case Diagrams · made in Skemio

Use case diagram showing Customer and Payment Gateway interacting with seat selection, reservation timeout, and checkout use cases.

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What it shows

Temporary TTL locks block race conditions during checkout
Timeouts auto-release held seats without orphaned states
Payment confirmation converts soft locks to hard bookings

The takeaway

Soft locks protect inventory from double-booking while preserving checkout throughput.

#SystemDesign,#SoftwareEngineering,#UML,#BackendDev,#TechArchitecture

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