# Stateless Processing

Record: `arch:stateless-processing`
Kind: principle
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Severity: recommended
Scope: function, stream processor, service
Canonical: https://banes-lab.com/ontology#arch-stateless-processing

## Repair

- Refactored by: Externalize State, Pass State Explicitly
- Detected by: mutable state across records/requests
- Violated by: hidden mutable state in processor
- Measured by: stateful operator count
- Enforced by: [code review](https://banes-lab.com/records/arch/code-review.md), [tests](https://banes-lab.com/records/lex/tests.md)

## requires

- [Explicit Inputs](https://banes-lab.com/records/lex/explicit-inputs.md)
- [No Hidden State](https://banes-lab.com/records/lex/no-hidden-state.md)

## reinforces

- [Scalability](https://banes-lab.com/records/arch/scalability.md)
- [Testability](https://banes-lab.com/records/arch/testability.md)

## enables

- [Parallel Processing](https://banes-lab.com/records/lex/parallel-processing.md)

## conflicts-with

- [Stateful Hidden Accumulation](https://banes-lab.com/records/lex/stateful-hidden-accumulation.md)

## tensions-with

- [Stateful Business Rules](https://banes-lab.com/records/lex/stateful-business-rules.md)

## tensions

- [Stateless Processing Stateful Business Rules](https://banes-lab.com/records/tension/stateful-business-rules-stateless-processing.md)