---
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.

## constructor

### Parameters

<ParameterTypes parameters={[
  {
    "name": "__namedParameters",
    "type": "`InjectedDependencies`",
    "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](../../medusa/types/medusa.ConfigModule-1.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](../../medusa/types/medusa.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](services.StagedJobService.mdx)",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "transactionManager_",
    "type": "`undefined` \\| `EntityManager`",
    "description": "",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

___

## Accessors

### activeManager\_

#### Returns

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

___

### eventBusModuleService\_

#### Returns

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

___

## Methods

### atomicPhase\_

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

<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](../../entities/classes/entities.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&#60;T&#62;[]",
    "description": "The data to use to process the events",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

#### Returns

<ParameterTypes parameters={[
  {
    "name": "Promise",
    "type": "Promise&#60;void \\| [StagedJob](../../entities/classes/entities.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](../../entities/classes/entities.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

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

___

### enqueuer\_

#### Returns

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

___

### listJobs

#### Parameters

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

#### Returns

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

___

### shouldRetryTransaction\_

#### Parameters

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

#### Returns

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

___

### startEnqueuer

#### Returns

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

___

### stopEnqueuer

#### Returns

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

___

### subscribe

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&#60;unknown&#62;",
    "description": "the function to be called when a certain event\nhappens. Subscribers must return a Promise.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "context",
    "type": "[SubscriberContext](../../medusa/interfaces/medusa.SubscriberContext.mdx)",
    "description": "subscriber context",
    "optional": true,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

#### Returns

<ParameterTypes parameters={[
  {
    "name": "EventBusService",
    "type": "`object`",
    "description": "Can keep track of multiple subscribers to different events and run the\nsubscribers when events happen. Events will run asynchronously.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

___

### unsubscribe

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&#60;unknown&#62;",
    "description": "the function to be removed",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  },
  {
    "name": "context",
    "type": "[SubscriberContext](../../medusa/interfaces/medusa.SubscriberContext.mdx)",
    "description": "subscriber context",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

#### Returns

<ParameterTypes parameters={[
  {
    "name": "EventBusService",
    "type": "`object`",
    "description": "Can keep track of multiple subscribers to different events and run the\nsubscribers when events happen. Events will run asynchronously.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />

___

### withTransaction

#### Parameters

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

#### Returns

<ParameterTypes parameters={[
  {
    "name": "EventBusService",
    "type": "`object`",
    "description": "Can keep track of multiple subscribers to different events and run the\nsubscribers when events happen. Events will run asynchronously.",
    "optional": false,
    "defaultValue": "",
    "expandable": false,
    "children": []
  }
]} />
