Design (LLD) Call Center - Machine CodingSubhahu Jain·Oct 23, 2022·6 min readTable of contents⚠️ Issues in Above Design1️⃣ Factory Design Is Weak (LLD Issue)ProblemLLD IssuesInterview ExpectationSolution2️⃣ Company Interface Is Missing Core ResponsibilitiesProblemLLD IssuesInterview Red Flag 🚨Solution3️⃣ Observer Pattern Is NOT Thread-SafeProblemConcurrency IssuesReal-World ImpactInterview ExpectationSolution4️⃣ Observer Notifications Block Critical PathsProblemLLD + Concurrency IssueInterview KeywordSolution5️⃣ Call State Machine Is IncompleteProblemLLD IssuesConcurrency IssueResultSolution6️⃣ No Call Ownership / LockingProblemConcurrency IssueInterview ExpectationSolution7️⃣ Command Pattern Is Too ThinProblemLLD IssuesConcurrency IssueInterview InsightSolution8️⃣ Composite Pattern Is MisusedProblemLLD IssuesReal-World GapInterview ExpectationSolution9️⃣ No Capacity or Load Control (Concurrency Killer)Missing EntirelyReal-World FailureSolution🔟 Singleton Mentioned but Not DesignedProblemLLD IssuesConcurrency RiskSolutionGeneral ProgrammingJavaScriptPythonProgramming BlogsWeb DevelopmentReactAWSBeginner DevelopersDevopsDeveloper
