---
displayed_sidebar: servicesSidebar
---

import ParameterTypes from "@site/src/components/ParameterTypes"

# EventBusService

Can keep track of multiple subscribers to different events and run the
subscribers when events happen. Events will run asynchronously.

## Implements

- [IEventBusService](../interfaces/IEventBusService.mdx)

## Constructors

#### constructor

`**new EventBusService**(«destructured», config, isSingleton?)`

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "__namedParameters",
    "type": "[InjectedDependencies](../types/InjectedDependencies-10.mdx)",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "config",
    "type": "`any`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "isSingleton",
    "type": "`boolean`",
    "description": "",
    "optional": false,
    "defaultValue": "true",
    "expandable": false,
    "children": []
  }
]} />

## Properties

<ParameterTypes parameters={[
  {
    "name": "__configModule__",
    "type": "`Record<string, unknown>`",
    "description": "",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "__container__",
    "type": "`any`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "__moduleDeclaration__",
    "type": "`Record<string, unknown>`",
    "description": "",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "config_",
    "type": "[ConfigModule](../types/ConfigModule.mdx)",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "enqueue_",
    "type": "Promise&#60;void&#62;",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "logger_",
    "type": "[Logger](../interfaces/Logger.mdx)",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "manager_",
    "type": "EntityManager",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "shouldEnqueuerRun",
    "type": "`boolean`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "stagedJobService_",
    "type": "[StagedJobService](StagedJobService.mdx)",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "transactionManager_",
    "type": "`undefined` \\| EntityManager",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

## Accessors

#### activeManager\_

 `Protected` **activeManager\_**: [object Object]

___

#### eventBusModuleService\_

 `Protected` **eventBusModuleService\_**: [object Object]

## Methods

#### atomicPhase\_

`Protected **atomicPhase_**<TypeParameter TResult, TypeParameter TError>(work, isolationOrErrorHandler?, maybeErrorHandlerOrDontFail?): Promise&#60;TResult&#62;`

Wraps some work within a transactional block. If the service already has
a transaction manager attached this will be reused, otherwise a new
transaction manager is created.

##### Type Parameters

<ParameterTypes parameters={[
  {
    "name": "TResult",
    "type": "`object`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "TError",
    "type": "`object`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "work",
    "type": "(`transactionManager`: EntityManager) => Promise&#60;TResult&#62;",
    "description": "the transactional work to be done",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "isolationOrErrorHandler",
    "type": "`IsolationLevel` \\| (`error`: `TError`) => Promise&#60;void \\| TResult&#62;",
    "description": "the isolation level to be used for the work.",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "maybeErrorHandlerOrDontFail",
    "type": "(`error`: `TError`) => Promise&#60;void \\| TResult&#62;",
    "description": "Potential error handler",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

Promise&#60;TResult&#62;

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;TResult&#62;",
    "optional": false,
    "defaultValue": "",
    "description": "the result of the transactional work",
    "expandable": false,
    "children": []
  }
]} />

___

#### emit

`**emit**<TypeParameter T>(data): Promise&#60;void \| [StagedJob](StagedJob.mdx)[]&#62;`

Calls all subscribers when an event occurs.

##### Type Parameters

<ParameterTypes parameters={[
  {
    "name": "T",
    "type": "`object`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "data",
    "type": "[EmitData](../types/EmitData.mdx)&#60;T&#62;[]",
    "description": "The data to use to process the events",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

Promise&#60;void \| [StagedJob](StagedJob.mdx)[]&#62;

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;void \\| [StagedJob](StagedJob.mdx)[]&#62;",
    "optional": false,
    "defaultValue": "",
    "description": "the jobs from our queue",
    "expandable": false,
    "children": []
  }
]} />

`**emit**<TypeParameter T>(eventName, data, options?): Promise&#60;void \| [StagedJob](StagedJob.mdx)&#62;`

Calls all subscribers when an event occurs.

##### Type Parameters

<ParameterTypes parameters={[
  {
    "name": "T",
    "type": "`object`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "eventName",
    "type": "`string`",
    "description": "the name of the event to be process.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "data",
    "type": "`T`",
    "description": "the data to send to the subscriber.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "options",
    "type": "`Record<string, unknown>`",
    "description": "options to add the job with",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

Promise&#60;void \| [StagedJob](StagedJob.mdx)&#62;

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;void \\| [StagedJob](StagedJob.mdx)&#62;",
    "optional": false,
    "defaultValue": "",
    "description": "the job from our queue",
    "expandable": false,
    "children": []
  }
]} />

___

#### enqueuer\_

`**enqueuer_**(): Promise&#60;void&#62;`

##### Returns

Promise&#60;void&#62;

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;void&#62;",
    "optional": false,
    "defaultValue": "",
    "description": "",
    "expandable": false,
    "children": []
  }
]} />

___

#### listJobs

`Protected **listJobs**(listConfig): Promise&#60;never[] \| [StagedJob](StagedJob.mdx)[]&#62;`

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "listConfig",
    "type": "[FindConfig](../interfaces/FindConfig.mdx)&#60;[StagedJob](StagedJob.mdx)&#62;",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

Promise&#60;never[] \| [StagedJob](StagedJob.mdx)[]&#62;

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;never[] \\| [StagedJob](StagedJob.mdx)[]&#62;",
    "optional": false,
    "defaultValue": "",
    "description": "",
    "expandable": false,
    "children": []
  }
]} />

___

#### shouldRetryTransaction\_

`Protected **shouldRetryTransaction_**(err): boolean`

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "err",
    "type": "`Record<string, unknown>` \\| ``{ code: string  }``",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

`boolean`

<ParameterTypes parameters={[
  {
    "name": "boolean",
    "type": "`boolean`",
    "optional": true,
    "defaultValue": "",
    "description": "",
    "expandable": false,
    "children": []
  }
]} />

___

#### startEnqueuer

`**startEnqueuer**(): void`

##### Returns

`void`

<ParameterTypes parameters={[
  {
    "name": "void",
    "type": "`void`",
    "optional": true,
    "defaultValue": "",
    "description": "",
    "expandable": false,
    "children": []
  }
]} />

___

#### stopEnqueuer

`**stopEnqueuer**(): Promise&#60;void&#62;`

##### Returns

Promise&#60;void&#62;

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;void&#62;",
    "optional": false,
    "defaultValue": "",
    "description": "",
    "expandable": false,
    "children": []
  }
]} />

___

#### subscribe

`**subscribe**(event, subscriber, context?): [EventBusService](EventBusService.mdx)`

Adds a function to a list of event subscribers.

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "event",
    "type": "`string` \\| `symbol`",
    "description": "the event that the subscriber will listen for.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "subscriber",
    "type": "[Subscriber](../types/Subscriber.mdx)&#60;unknown&#62;",
    "description": "the function to be called when a certain event happens. Subscribers must return a Promise.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "context",
    "type": "[SubscriberContext](../types/SubscriberContext.mdx)",
    "description": "subscriber context",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

[EventBusService](EventBusService.mdx)

<ParameterTypes parameters={[
  {
    "name": "default",
    "type": "[EventBusService](EventBusService.mdx)",
    "optional": false,
    "defaultValue": "",
    "description": "this",
    "expandable": false,
    "children": []
  }
]} />

___

#### unsubscribe

`**unsubscribe**(event, subscriber, context): [EventBusService](EventBusService.mdx)`

Removes function from the list of event subscribers.

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "event",
    "type": "`string` \\| `symbol`",
    "description": "the event of the subcriber.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "subscriber",
    "type": "[Subscriber](../types/Subscriber.mdx)&#60;unknown&#62;",
    "description": "the function to be removed",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "context",
    "type": "[SubscriberContext](../types/SubscriberContext.mdx)",
    "description": "subscriber context",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

[EventBusService](EventBusService.mdx)

<ParameterTypes parameters={[
  {
    "name": "default",
    "type": "[EventBusService](EventBusService.mdx)",
    "optional": false,
    "defaultValue": "",
    "description": "this",
    "expandable": false,
    "children": []
  }
]} />

___

#### withTransaction

`**withTransaction**(transactionManager?): [EventBusService](EventBusService.mdx)`

##### Parameters

<ParameterTypes parameters={[
  {
    "name": "transactionManager",
    "type": "EntityManager",
    "description": "",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

##### Returns

[EventBusService](EventBusService.mdx)

<ParameterTypes parameters={[
  {
    "name": "default",
    "type": "[EventBusService](EventBusService.mdx)",
    "optional": false,
    "defaultValue": "",
    "description": "",
    "expandable": false,
    "children": []
  }
]} />
