XTend Fabric Runtime
XTend Fabric is the coordination layer for runtime work. It maps RMT scheduling intent into lanes and fibers, makes hydration decisions and exposes telemetry plus diagnostics.
What This Layer Is
Fabric supplies work intents and policy hints to the shared injected RMT scheduler. In 0.8.0, only that microkernel owns the queue, priority selection and host execution. Fabric does not run a second scheduler.
What this layer knows
Fabric knows Fabric lanes, RMT lane mapping, schedule records, fiber context, hydration policies, backpressure, completion signals, diagnostics and telemetry snapshots.
Fabric can identify whether work is visible, idle, diagnostic or user-blocking. That helps the app control repaints, reflows and unnecessary hydration work.
What it does not know
Fabric does not parse RMT, render UI, own framework components or execute business logic.
Fabric does not decide whether a React, Vue or XTend component is correct for the product. It only evaluates runtime intent, priority, hydration and diagnostic information.
Interfaces
import { createXtendFabric } from '@ccslabs/xtend/fabric';
import { resolveRmtScheduleForFiber } from '@ccslabs/xtend/fabric/rmt-lane-mapping';
const fabric = createXtendFabric();
const schedule = resolveRmtScheduleForFiber({
lane: 'visible',
scheduleRef: 'component.visible.hydrate',
kind: 'component.hydrate'
});The primary public entry points are createXtendFabric, hydration policy helpers, RMT lane mapping, diagnostics and telemetry snapshots.
Communication with other layers
Compiled RMT records and host adapters provide scheduling intent. Fabric normalizes lanes and hydration hints, forwards work intents and backpressure to the shared scheduler, and consumes its completion and diagnostic signals.
XTend UI and other framework adapters can use Fabric context to prioritize visible work before idle work, collect diagnostics and make component hydration traceable.
Next Steps
The 0.8 migration describes this shared authority. Maraca FastPass uses its existing user-blocking lane.