# Mediator Pattern

> A design pattern that routes the interactions between a set of objects through one coordinating object.

Record: `architecture:mediator-pattern`
Kind: pattern
Layer: [Design Patterns Core](https://banes-lab.com/records/layer/design-patterns-core.md)
Severity: contextual
Scope: object coordination, module
Canonical: https://banes-lab.com/ontology#architecture-mediator-pattern

Listed in [Architecture principles](https://banes-lab.com/api/records/architecture.md), after [Observer Pattern](https://banes-lab.com/records/architecture/observer-pattern.md) and before [Command Pattern](https://banes-lab.com/records/architecture/command-pattern.md).

## Repair

- Refactored by: Introduce Mediator
- Detected by: dense object dependency graph
- Violated by: many-to-many object dependencies
- Measured by: interaction graph density
- Enforced by: dependency graph checks

## Requires

- [Coordination Complexity](https://banes-lab.com/records/lexicon/coordination-complexity.md)

## Reinforces

- [Low Coupling](https://banes-lab.com/records/architecture/low-coupling.md)

## Enables

- [Centralized Interaction Logic](https://banes-lab.com/records/lexicon/centralized-interaction-logic.md)

## Conflicts with

- [Mesh Dependencies](https://banes-lab.com/records/lexicon/mesh-dependencies.md)

## In tension with

- [Mediator God Object](https://banes-lab.com/records/lexicon/mediator-god-object.md)

## Tensions

- [Mediator Pattern / Mediator God Object](https://banes-lab.com/records/tension/mediator-god-object-mediator-pattern.md)

## Severity

- [contextual](https://banes-lab.com/records/vocabulary/severity-contextual.md)

## Category

- [Behavioral Patterns](https://banes-lab.com/records/architecture-category/behavioral-patterns.md)

## Linked from

- [Core Modular Design](https://banes-lab.com/ontology/principles/architecture-category-core-modular-design.md)
- [Behavioral Patterns](https://banes-lab.com/ontology/lexicon/lexicon-category-behavioral-patterns.md)
- [Severity levels](https://banes-lab.com/ontology/schema/the-vocabulary-severity.md)
- [The resolutions](https://banes-lab.com/ontology/schema/the-resolutions.md)