Design (LLD) Inventory Management System - Machine CodingSubhahu Jain·Oct 22, 2022·9 min readTable of contentsCode⚠️ Issues in Above Design1️⃣ Inventory Is Not Transactional (Critical Bug)ProblemLLD IssueConcurrency IssueInterview ExpectationSolution2️⃣ Product Quantity Is Not Thread-SafeProblemConcurrency IssueReal ImpactInterview KeywordSolution3️⃣ Observer Pattern Is Synchronous & DangerousProblemLLD + Concurrency IssueExample FailureExpected Fix (Conceptually)Solution4️⃣ HashMap Everywhere (Not Safe)ProblemConcurrency IssueInterview ExpectationSolution5️⃣ ID Generator Is Broken Under ConcurrencyProblemConcurrency IssueReal ImpactInterview Red Flag 🚨Solution6️⃣ Order Placement Does Not Lock ProductsProblemLLD IssueConcurrency ImpactInterview InsightSolution7️⃣ Pricing Strategy Is Stateless but MisplacedProblemLLD IssueInterview SignalSolution8️⃣ InventoryManagementSystem Is a God ServiceProblemLLD IssueInterview ExpectationSolution9️⃣ No Consistency Between Order Status & InventoryProblemLLD IssueConcurrency RiskSolution🔟 Reporting & Analytics Will Kill PerformanceRequirementCurrent GapConcurrency IssueInterview KeywordSolutionJavaScriptPythonGeneral ProgrammingJavaProgramming Blogs
