# Introduce Async Event

> A technique for replacing a synchronous call that need not complete in the request with an event a consumer handles later.

Record: `lexicon:introduce-async-event`
Kind: technique
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-introduce-async-event

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Query Projection](https://banes-lab.com/records/lexicon/query-projection.md) and before [Own Data per Service](https://banes-lab.com/records/lexicon/own-data-per-service.md).

## Category

- [Event Messaging Async](https://banes-lab.com/records/lexicon-category/event-messaging-async.md)

## Refactors

- [Synchronous Chain Trap](https://banes-lab.com/records/architecture/synchronous-chain-trap.md)
- [Scalability](https://banes-lab.com/records/architecture/scalability.md)
- [Latency](https://banes-lab.com/records/architecture/latency.md)

## Linked from

- [Anti-patterns](https://banes-lab.com/ontology/principles/architecture-category-anti-patterns.md)
- [Scalability / Performance / Optimization](https://banes-lab.com/ontology/principles/architecture-category-scalability-performance-optimization.md)