Distributed State Management
Keep state consistent across microservices with automatic propagation of changes. No eventual consistency surprises or manual synchronization.
Overview
Microservices architectures create state synchronization challenges. Services need to know about state changes in other services, but maintaining consistency is hard. Caching gets stale, events get missed, and you end up building complex choreography and saga patterns to keep state in sync.
The Challenge
When a critical state changes in one service, how do dependent services know? You're forced to choose between polling (inefficient), webhooks (brittle), or messaging systems (complex). Each approach has its downsides: missed updates, duplicates, ordering issues, or partial failures that leave you with inconsistent state across your system.
How Slung Helps
Slung provides a unified fact store that all services can subscribe to. When a fact changes, dependent services automatically get notified. Services define rules about what state they care about, and Slung ensures those rules are always evaluated against the latest facts. No polling, no missed events, no manual synchronization.
Key Benefits
Automatic Propagation
State changes propagate instantly to all dependent services. No polling or event replay needed.
Consistent Snapshot
Every service sees the same global state snapshot at the moment of evaluation.
No Choreography
Eliminate complex saga patterns. Services declare what they care about; Slung handles coordination.
Traceability
Understand exactly which state changes triggered which service actions across your system.
Example: E-commerce System
In a distributed e-commerce system with separate Order, Inventory, and Billing services:
• When Inventory publishes "item_low_stock", Billing automatically pauses promotions for that item
• When Billing posts "refund_processed", Inventory releases reserved units immediately
• When a customer is flagged as "high_risk", Order service auto-requires additional verification
• All services always know the current state without polling or manual syncing
Services stay consistent, react in real time, and never need to rebuild state. State changes propagate once and reach all affected services automatically.
Get Started
Explore the documentation to learn how to integrate Slung with your services, or check out other use cases.
Slung lets you model your systems to handle complex scenarios without having to handle endless edge-cases:
Real-time Data Pipelines
Automatically react to streaming data changes and propagate updates across your pipeline without manual orchestration.
Event-driven Workflows
Execute workflows that adapt in real time based on changing facts and conditions across your system.
Distributed State Management
Maintain consistent global state across microservices with automatic propagation of changes.
Adaptive Business Logic
Build systems that automatically recalculate and adapt decisions when underlying data changes.