exactly-once

High-performance transactional message broker for applications that need an ordered stream per entity.

Example gaming leaderboard application covering streaming ingestion, CDC enrichment, processing and visualisation including demo of advance real-time analytics concepts like late data arrival, exactly-once, dynamic config, archival and on-demand replay

The Inbox Pattern/Process for Laravel apps. Ensure the ordering, uniqueness, and reliable handling of webhook requests.

Stateful actors on Apache Flink 2.x and Java 21 — durable per-key state, exactly-once messaging, Kafka and Kinesis I/O, Kubernetes-native deployment. Continues the Apache Stateful Functions programming model on the modern Flink line.

Exactly-once + circuit breaker for agent tool calls (loops, retries, duplicate side effects)

Lightweight Python message queuing with Redis and built-in publish-side deduplication.

Crash-safe distributed job execution with fencing tokens, lease recovery and deterministic failure validation.

Riffl - generic streaming data ingestion framework

Self-hosted control plane for AI video production: an exactly-once job ledger, a documented remote-worker protocol, TTS narration, subtitle alignment and FFmpeg assembly, with pluggable providers.

Embedded-first, Arrow-native stream processing engine in modern C++ (C++23). Run SQL streaming pipelines in-process in milliseconds, or submit the same file to a distributed cluster: exactly-once, event time, state as open Arrow data, deterministic replay.

Durable, exactly-once execution for agent workflows — enforced authority, a receipt for every effect, crash-safe resume, replayable & auditable history.

Observer/Learner replicas for Apache Kafka — sync without joining the ISR; promote in seconds with zero data movement. Reference implementation with real-cluster evidence.

Wrappers for Apache Kafka java clients

Interactive browser simulator that visualizes delivery guarantees, idempotency, DLQ, Outbox and Inbox patterns across Azure Service Bus, Event Hubs, Event Grid, Kafka, RabbitMQ and more. Built for teaching Event-Driven Architecture.

Vibe-code durable AI workflows over sensitive data. The compiler refuses to build one that leaks, loops forever, or pays twice; the runtime makes every external action durable and exactly-once.

3 Problems from SP04 to be solved using HashMap/ HashSet instead of TreeMap/ TreeSet.

Exactly-once Kafka delayed-message relay: re-deliver each record to a destination topic at the time its producer asked for, observed exactly-once by read_committed consumers.

Framework-agnostic Elixir CDC consumer for Postgres logical replication (pgoutput) with sink-owned, transaction-granularity exactly-once delivery.

Make AI agent actions exactly-once and human-approvable, with a tamper-evident audit. pip install airlock-sdk

Verified Effect Commit Protocol for AI agents — seal the intended effect, witness the actual outcome.