EventBusService

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

Implements

• IEventBusService

Constructors

constructor

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

Parameters

__namedParametersInjectedDependenciesRequired

configanyRequired

isSingletonbooleanRequired

Default: true

Properties

__configModule__Record<string, unknown>

__container__anyRequired

__moduleDeclaration__Record<string, unknown>

config_ConfigModuleRequired

enqueue_Promise<void>Required

logger_LoggerRequired

manager_EntityManagerRequired

shouldEnqueuerRunbooleanRequired

stagedJobService_StagedJobServiceRequired

transactionManager_undefined | EntityManagerRequired

Accessors

activeManager_

Protected get**activeManager_**(): EntityManager

Returns

EntityManager

EntityManagerEntityManagerRequired

---

eventBusModuleService_

Protected get**eventBusModuleService_**(): [IEventBusModuleService](/references/services/interfaces/IEventBusModuleService)

Returns

IEventBusModuleService

IEventBusModuleServiceIEventBusModuleServiceRequired

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.

TResultobjectRequired

TErrorobjectRequired

Parameters

work(transactionManager: EntityManager) => Promise<TResult>Required

the transactional work to be done

isolationOrErrorHandlerIsolationLevel | (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>

PromisePromise<TResult>Required

the result of the transactional work

---

emit

**emit**<TypeParameter T>(data): Promise&#60;void \| [StagedJob](/references/services/classes/StagedJob)[]&#62;

Calls all subscribers when an event occurs.

TobjectRequired

Parameters

dataEmitData<T>[]Required

The data to use to process the events

Returns

Promise<void | StagedJob[]>

PromisePromise<void | StagedJob[]>Required

the jobs from our queue

**emit**<TypeParameter T>(eventName, data, options?): Promise&#60;void \| [StagedJob](/references/services/classes/StagedJob)&#62;

Calls all subscribers when an event occurs.

TobjectRequired

Parameters

eventNamestringRequired

the name of the event to be process.

dataTRequired

the data to send to the subscriber.

optionsRecord<string, unknown>

options to add the job with

Returns

Promise<void | StagedJob>

PromisePromise<void | StagedJob>Required

the job from our queue

---

enqueuer_

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

Returns

Promise<void>

PromisePromise<void>Required

---

listJobs

Protected **listJobs**(listConfig): Promise<never[] \| [StagedJob](/references/services/classes/StagedJob)[]>

Parameters

listConfigFindConfig<StagedJob>Required

Returns

Promise<never[] | StagedJob[]>

PromisePromise<never[] | StagedJob[]>Required

---

shouldRetryTransaction_

Protected **shouldRetryTransaction_**(err): boolean

Parameters

errRecord<string, unknown> | &#123; code: string &#125;Required

Returns

boolean

booleanboolean

---

startEnqueuer

**startEnqueuer**(): void

Returns

void

voidvoid

---

stopEnqueuer

**stopEnqueuer**(): Promise<void>

Returns

Promise<void>

PromisePromise<void>Required

---

subscribe

**subscribe**(event, subscriber, context?): [EventBusService](/references/services/classes/EventBusService)

Adds a function to a list of event subscribers.

Parameters

eventstring | symbolRequired

the event that the subscriber will listen for.

subscriberSubscriber<unknown>Required

the function to be called when a certain event happens. Subscribers must return a Promise.

contextSubscriberContext

subscriber context

Returns

EventBusService

defaultEventBusServiceRequired

this

---

unsubscribe

**unsubscribe**(event, subscriber, context): [EventBusService](/references/services/classes/EventBusService)

Removes function from the list of event subscribers.

Parameters

eventstring | symbolRequired

the event of the subcriber.

subscriberSubscriber<unknown>Required

the function to be removed

contextSubscriberContextRequired

subscriber context

Returns

EventBusService

defaultEventBusServiceRequired

this

---

withTransaction

**withTransaction**(transactionManager?): [EventBusService](/references/services/classes/EventBusService)

Parameters

transactionManagerEntityManager

Returns

EventBusService

defaultEventBusServiceRequired