---
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`<`void`\\>",
    "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` `get` **activeManager_**(): `EntityManager`

#### Returns

`EntityManager`

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

___

### eventBusModuleService\_

`Protected` `get` **eventBusModuleService_**(): [`IEventBusModuleService`](../interfaces/IEventBusModuleService.mdx)

#### Returns

[`IEventBusModuleService`](../interfaces/IEventBusModuleService.mdx)

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

## Methods

### atomicPhase\_

`Protected` **atomicPhase_**<`TResult`, `TError`\>(`work`, `isolationOrErrorHandler?`, `maybeErrorHandlerOrDontFail?`): `Promise`<`TResult`\>

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.

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

#### Returns

`Promise`<`TResult`\>

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

___

### emit

**emit**<`T`\>(`data`): `Promise`<`void` \| [`StagedJob`](StagedJob.mdx)[]\>

Calls all subscribers when an event occurs.

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

#### Parameters

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

#### Returns

`Promise`<`void` \| [`StagedJob`](StagedJob.mdx)[]\>

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

**emit**<`T`\>(`eventName`, `data`, `options?`): `Promise`<`void` \| [`StagedJob`](StagedJob.mdx)\>

Calls all subscribers when an event occurs.

<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`<`void` \| [`StagedJob`](StagedJob.mdx)\>

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

___

### enqueuer\_

**enqueuer_**(): `Promise`<`void`\>

#### Returns

`Promise`<`void`\>

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

___

### listJobs

`Protected` **listJobs**(`listConfig`): `Promise`<`never`[] \| [`StagedJob`](StagedJob.mdx)[]\>

#### Parameters

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

#### Returns

`Promise`<`never`[] \| [`StagedJob`](StagedJob.mdx)[]\>

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "`Promise`<`never`[] \\| [`StagedJob`](StagedJob.mdx)[]\\>",
    "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`<`void`\>

#### Returns

`Promise`<`void`\>

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "`Promise`<`void`\\>",
    "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)<`unknown`\\>",
    "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)<`unknown`\\>",
    "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": []
  }
]} />
