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medusa-store/www/docs/content/references/services/classes/EventBusService.md
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9.9 KiB

Class: EventBusService

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

Hierarchy

  • TransactionBaseService

    EventBusService

Implements

  • IEventBusService

Constructors

constructor

new EventBusService(__namedParameters, config, isSingleton?)

Parameters

Name Type Default value
__namedParameters InjectedDependencies undefined
config any undefined
isSingleton boolean true

Overrides

TransactionBaseService.constructor

Defined in

medusa/src/services/event-bus.ts:32

Properties

__configModule__

Protected Optional Readonly __configModule__: Record<string, unknown>

Inherited from

TransactionBaseService.__configModule__

Defined in

medusa/src/interfaces/transaction-base-service.ts:14


__container__

Protected Readonly __container__: any

Inherited from

TransactionBaseService.__container__

Defined in

medusa/src/interfaces/transaction-base-service.ts:13


__moduleDeclaration__

Protected Optional Readonly __moduleDeclaration__: Record<string, unknown>

Inherited from

TransactionBaseService.__moduleDeclaration__

Defined in

medusa/src/interfaces/transaction-base-service.ts:15


config_

Protected Readonly config_: ConfigModule

Defined in

medusa/src/services/event-bus.ts:24


enqueue_

Protected enqueue_: Promise<void>

Defined in

medusa/src/services/event-bus.ts:30


eventBusModuleService_

Protected Readonly eventBusModuleService_: IEventBusModuleService

Defined in

medusa/src/services/event-bus.ts:27


manager_

Protected manager_: EntityManager

Inherited from

TransactionBaseService.manager_

Defined in

medusa/src/interfaces/transaction-base-service.ts:5


shouldEnqueuerRun

Protected shouldEnqueuerRun: boolean

Defined in

medusa/src/services/event-bus.ts:29


stagedJobService_

Protected Readonly stagedJobService_: StagedJobService

Defined in

medusa/src/services/event-bus.ts:25


transactionManager_

Protected transactionManager_: undefined | EntityManager

Inherited from

TransactionBaseService.transactionManager_

Defined in

medusa/src/interfaces/transaction-base-service.ts:6

Accessors

activeManager_

Protected get activeManager_(): EntityManager

Returns

EntityManager

Inherited from

TransactionBaseService.activeManager_

Defined in

medusa/src/interfaces/transaction-base-service.ts:8

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.

Type parameters

Name
TResult
TError

Parameters

Name Type Description
work (transactionManager: EntityManager) => Promise<TResult> the transactional work to be done
isolationOrErrorHandler? IsolationLevel | (error: TError) => Promise<void | TResult> the isolation level to be used for the work.
maybeErrorHandlerOrDontFail? (error: TError) => Promise<void | TResult> Potential error handler

Returns

Promise<TResult>

the result of the transactional work

Inherited from

TransactionBaseService.atomicPhase_

Defined in

medusa/src/interfaces/transaction-base-service.ts:56


emit

emit<T>(data): Promise<void | StagedJob[]>

Calls all subscribers when an event occurs.

Type parameters

Name
T

Parameters

Name Type Description
data EmitData<T>[] The data to use to process the events

Returns

Promise<void | StagedJob[]>

the jobs from our queue

Implementation of

EventBusTypes.IEventBusService.emit

Defined in

medusa/src/services/event-bus.ts:112

emit<T>(eventName, data, options?): Promise<void | StagedJob>

Calls all subscribers when an event occurs.

Type parameters

Name
T

Parameters

Name Type Description
eventName string the name of the event to be process.
data T the data to send to the subscriber.
options? Record<string, unknown> options to add the job with

Returns

Promise<void | StagedJob>

the job from our queue

Implementation of

EventBusTypes.IEventBusService.emit

Defined in

medusa/src/services/event-bus.ts:121


enqueuer_

enqueuer_(): Promise<void>

Returns

Promise<void>

Defined in

medusa/src/services/event-bus.ts:185


shouldRetryTransaction_

Protected shouldRetryTransaction_(err): boolean

Parameters

Name Type
err Record<string, unknown> | { code: string }

Returns

boolean

Inherited from

TransactionBaseService.shouldRetryTransaction_

Defined in

medusa/src/interfaces/transaction-base-service.ts:37


startEnqueuer

startEnqueuer(): void

Returns

void

Defined in

medusa/src/services/event-bus.ts:175


stopEnqueuer

stopEnqueuer(): Promise<void>

Returns

Promise<void>

Defined in

medusa/src/services/event-bus.ts:180


subscribe

subscribe(event, subscriber, context?): EventBusService

Adds a function to a list of event subscribers.

Parameters

Name Type Description
event string | symbol the event that the subscriber will listen for.
subscriber Subscriber<unknown> the function to be called when a certain event happens. Subscribers must return a Promise.
context? SubscriberContext subscriber context

Returns

EventBusService

this

Implementation of

EventBusTypes.IEventBusService.subscribe

Defined in

medusa/src/services/event-bus.ts:78


unsubscribe

unsubscribe(event, subscriber, context): EventBusService

Removes function from the list of event subscribers.

Parameters

Name Type Description
event string | symbol the event of the subcriber.
subscriber Subscriber<unknown> the function to be removed
context SubscriberContext subscriber context

Returns

EventBusService

this

Implementation of

EventBusTypes.IEventBusService.unsubscribe

Defined in

medusa/src/services/event-bus.ts:98


withTransaction

withTransaction(transactionManager?): EventBusService

Parameters

Name Type
transactionManager? EntityManager

Returns

EventBusService

Implementation of

EventBusTypes.IEventBusService.withTransaction

Overrides

TransactionBaseService.withTransaction

Defined in

medusa/src/services/event-bus.ts:49