# Feature System

The Feature System defines how runtime behavior is implemented in OMS.

A feature is the core unit of logic. It reacts to events and may trigger actions.

***

### Overview

A feature:

* implements behavior
* listens to lifecycle events
* may trigger actions
* may register custom commands
* may subscribe external event listeners\*

{% hint style="info" %}
Note: External Event Listeners

Features may register external event listeners through `OmsFeature.createEventListeners()`.

These listeners are registered on the Forge event bus independently of the feature enabled state.\
If a listener should only execute while the feature is enabled, the feature must enforce that explicitly.
{% endhint %}

Features are registered by addons and executed by the `FeatureManager`.

***

### Core Types

#### OmsFeature

`OmsFeature` is the base class for implementing feature logic.\
Combines lifecycle handling, configuration, commands, and info.

{% @github-files/github-code-block url="<https://github.com/c0nnor263/OperateMyServer/blob/main/oms-api/src/main/kotlin/io/conboi/oms/api/foundation/feature/OmsFeature.kt>" %}

***

#### FeatureLifecycle

`FeatureLifecycle` defines lifecycle callbacks used by features.

{% @github-files/github-code-block url="<https://github.com/c0nnor263/OperateMyServer/blob/main/oms-api/src/main/kotlin/io/conboi/oms/api/foundation/feature/FeatureLifecycle.kt>" %}

***

#### FeatureInfo

`FeatureInfo` describes feature metadata used for registration and diagnostics.

{% @github-files/github-code-block url="<https://github.com/c0nnor263/OperateMyServer/blob/main/oms-api/src/main/kotlin/io/conboi/oms/api/foundation/feature/FeatureInfo.kt>" %}

***

#### ConfigWatcher

`ConfigWatcher` provides utilities for tracking configuration changes.

{% @github-files/github-code-block url="<https://github.com/c0nnor263/OperateMyServer/blob/main/oms-api/src/main/kotlin/io/conboi/oms/api/foundation/feature/ConfigWatcher.kt>" %}

***

#### Priority

`Priority` defines feature execution order.

{% @github-files/github-code-block url="<https://github.com/c0nnor263/OperateMyServer/blob/main/oms-api/src/main/kotlin/io/conboi/oms/api/foundation/feature/Priority.kt>" %}

***

### Lifecycle

1. Feature is registered by an addon
2. Feature is managed by a `FeatureManager`
3. Feature receives lifecycle events
4. Feature executes logic
5. Feature may trigger actions

***

### Notes

* Features contain all runtime logic
* Addons only group features
* Execution is coordinated by the `FeatureManager`
* Configuration is initialized during the lifecycle


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