Publish‑/Subscribe‑messaging (pub/sub) is een begrip binnen de industriële digitalisering en event streaming, messaging & integratie.
Definitie
Publish/Subscribe-messaging (Pub/Sub) is een asynchronous messaging patroon waarbij berichten-producenten (publishers) berichten versturen zonder directe kennis van wie de berichten zal ontvangen. Consumenten (subscribers) registreren interesse in bepaalde bericht-types of topics en ontvangen relevante berichten automatisch. Dit decoupling-mechanisme is essentieel voor moderne industriële event-driven architectures.
Kenmerken
- Loose coupling: Publishers en subscribers zijn onafhankelijk van elkaar
- Topic-based routing: Berichten worden gecategoriseerd per onderwerp of event-type
- Many-to-many communication: Meerdere publishers kunnen naar meerdere subscribers
- Asynchronous delivery: Non-blocking message transmission
- Dynamic subscription: Runtime subscription changes zonder system restart
- Message persistence: Durable subscriptions voor offline subscribers
- Quality of Service: Delivery guarantees (at-most-once, at-least-once, exactly-once)
- Content filtering: Advanced message filtering op message properties
Toepassing
Manufacturing event distribution:
- Production events: Machine status changes, job completions, quality alerts
- Alarm propagation: Equipment alarms naar multiple monitoring systems
- KPI broadcasting: Real-time performance metrics naar dashboards en reports
- Inventory updates: Stock level changes naar planning en procurement systems
Unified Namespace architectures:
- Plant-wide data sharing: Sensor data distribution naar analytics en control systems
- Cross-system integration: MES, ERP, quality systems interconnection
- Mobile notifications: Production updates naar operator smartphones en tablets
- Cloud integration: Factory data streaming naar cloud analytics platforms
Real-time coordination:
- Process synchronization: Coordination tussen automated production cells
- Resource allocation: Dynamic resource assignment notifications
- Safety systems: Emergency notifications, zone lockouts, personnel alerts
- Maintenance scheduling: Predictive maintenance triggers, work order assignments
IIoT applications:
- Sensor networks: Distributed sensor data broadcasting
- Device management: Configuration updates, firmware notifications
- Analytics pipeline: Data streaming naar machine learning platforms
- Supply chain visibility: Track & trace events, delivery notifications
Gerelateerde begrippen
Verwante termen:
- Message broker - Infrastructure supporting pub/sub messaging
- Event-gedreven architectuur - Architectural pattern using pub/sub
- Apache Kafka - Distributed pub/sub platform voor enterprise applications
- MQTT broker - Pub/sub broker voor IoT en industrial applications
Verwante concepten:
- Unified Namespace - Modern industrial architecture using pub/sub
- Event streaming - Real-time event processing paradigm
- Message queuing - Alternative messaging pattern voor point-to-point communication
- Microservices - Service architecture pattern often using pub/sub
Bronnen
- Apache Kafka - Distributed streaming platform met pub/sub capabilities
- MQTT v5.0 - IoT messaging protocol met advanced pub/sub features
- Apache Pulsar - Cloud-native pub/sub messaging system
- Google Cloud Pub/Sub - Managed messaging service voor event-driven systems
- AWS Amazon SNS - Simple Notification Service voor pub/sub messaging
- Azure Service Bus - Enterprise messaging met pub/sub support
- RabbitMQ - Message broker met flexible pub/sub routing
- Redis Pub/Sub - In-memory pub/sub voor high-speed messaging
- Enterprise Integration Patterns - Design patterns voor pub/sub implementations
- Reactive Manifesto - Principles for responsive, resilient pub/sub systems
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