# Architecture principles whose scope is surface

> 6 records

This index as JSON: https://banes-lab.com/json/api/facets/architecture/scope/surface

## Entries

- [Write Barrier](https://banes-lab.com/records/architecture/write-barrier.md): A mechanism that lets a planned exclusive write to a shared surface proceed only once every peer is observed parked, beside a compare-and-swap that covers every other write.
- [Operand-Free Outcome Surface](https://banes-lab.com/records/architecture/operand-free-outcome-surface.md): A rule or precondition that a surface carrying one jointly authored product declares that one writer per record has no operand there, and settles a collision by announcement and by each author cutting its own duplicate.
- [Independent Lifetime Axes](https://banes-lab.com/records/architecture/independent-lifetime-axes.md): A design rule that a surface's lifetime is declared on three independent axes, retention, mutability and removal authority, each taking a value from a closed set, so no single word stands for all three.
- [Section Lifetime Divergence](https://banes-lab.com/records/architecture/section-lifetime-divergence.md): A rule or precondition that a file states a default lifetime and each section declares only the axes on which it differs, since the narrower unit is the more constrained one.
- [Fan-In Ceiling](https://banes-lab.com/records/architecture/fan-in-ceiling.md): A rule or precondition that the useful number of parties is bounded by the fan-in of the most contended surface, where claims resting on it go stale faster than they help.
- [Carrier and Payload Split](https://banes-lab.com/records/architecture/carrier-and-payload-split.md): A design rule that a surface read through a tool types the fields a mechanism joins on and leaves the fields only a reader consumes as prose, deciding the line per field.