Interactive Demos

These demos run on real backend services - not frontend mockups. Each one is based on actual production code from my projects.

Patterns demonstrated:

Rate LimitingDistributed LockKafka ConsumerWebSocketFraud DetectionCCU MonitoringgRPC FallbackRBACEvent-Driven

Production Patterns

Real Backend

Senior

Rate Limit Attack

Simulate spam attacks and watch KoiRateLimiter block malicious requests in real-time. Based on paygate rate limiting.

Source: paygate/KoiRateLimiter

Sliding WindowIP+User+Action KeyAuto BlockReal-time Log

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Senior

Suspicious User Detection

Detect potential fraudsters: users who deposit but don't bet, yet chat excessively. Real algorithm from production.

Source: transaction-realtime-tracking

Deposit + No Bet + ChatThreshold ConfigDaily SchedulerRedis Cache

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Senior

Kafka Event Stream

Multi-topic Kafka consumer with auto-blocking. Watch events flow through and trigger automatic actions.

Source: auto-operation/KafkaController

6 TopicsAuto-Block SpamEvent ReplayTopic Stats

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Senior

Distributed Lock

Redis-based distributed lock with try-acquire pattern. Simulate node contention and scheduler lock patterns.

Source: CacheService.tryAcquireLock

Try-AcquireAuto ReleaseContention DemoScheduler Pattern

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Senior

Lottery WebSocket

Real-time lottery with session state machine. Place bets, watch countdown, see results - all via WebSocket.

Source: lottery-api/LotteryWebsocket

State MachineReal-time SyncBet PlacementResult Broadcast

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Senior

CCU Monitor

Real-time concurrent user tracking with multi-dimension aggregation by platform, game, and region.

Source: ccu-realtime-monitor

Real-time ChartBy Platform/Game/RegionTraffic SimulationAlert Threshold

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Core Patterns

Architecture

gRPC + HTTP Fallback

Config-driven transport switching between gRPC and HTTP. Toggle transports and compare latency in real-time.

Source: auto-operation/IdServiceImpl

Config ToggleLatency CompareBatch Test

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Processor Pattern

Command routing with annotation-based registration and level-based authorization (PUBLIC, USER, INTERNAL, ADMIN).

Source: paygate/ProcessorManager

Command RoutingLevel AuthStrategy Pattern

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RBAC Permission

Role-based access control with inheritance. Check endpoint access for different roles and compare permissions.

Source: backoffice/RBAC

Role HierarchyPermission InheritEndpoint Check

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Event Handler Registry

Event dispatch with priority-based handler execution. Publish events and watch handlers trigger in order.

Source: event-system/EventHandler

Priority QueueAsync/SyncEvent Log

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