@empathyco/x-components/docs/API-reference/api/x-components.xprioritybus.md

Empathy X Components

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[Home](./index.md) &gt; [@empathyco/x-components](./x-components.md) &gt; [XPriorityBus](./x-components.xprioritybus.md)

## XPriorityBus class

A default [XBus](./x-components.xbus.md) implementation using a [priority queue](./x-components.xpriorityqueue.md) as its data structure to prioritise the emission of events. The priorities are preconfigured based on event naming.

**Signature:**

```typescript
export declare class XPriorityBus<SomeEvents extends Dictionary, SomeEventMetadata extends XPriorityBusEventMetadata> implements XBus<SomeEvents, SomeEventMetadata> 
```
**Implements:** [XBus](./x-components.xbus.md)<!-- -->&lt;SomeEvents, SomeEventMetadata&gt;

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(config)](./x-components.xprioritybus._constructor_.md) |  | Creates a new instance of a [XPriorityBus](./x-components.xprioritybus.md)<!-- -->. |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [emit(event, payload, metadata)](./x-components.xprioritybus.emit.md) |  | Emits an event. See [XBus.emit](./x-components.xbus.emit.md)<!-- -->. |
|  [on(event, withMetadata)](./x-components.xprioritybus.on.md) |  | Retrieves an observable for the event. See [XBus.on](./x-components.xbus.on.md)<!-- -->. |