# DefaultEventBridge API

Process-local in-memory event bridge for development and tests.

---
Canonical: /handbook/api/classes/_purista_core.DefaultEventBridge/
Source: DefaultEventBridge/DefaultEventBridge.impl.ts
Format: Markdown for agents
---

Process-local in-memory event bridge for development and tests.

Package: `@purista/core`

## Signature

```typescript
class DefaultEventBridge
```

## Examples

```typescript
import { DefaultEventBridge } from '@purista/core'

const eventBridge = new DefaultEventBridge()
await eventBridge.start()

// add your services
```

## Members

### Constructors

- `new constructor(config?: { defaultCommandTimeout: number; instanceId: string; logger: Logger; logLevel: LogLevelName; logWarnOnMessagesWithoutReceiver: boolean; metrics: PuristaMetricsRuntimeOptions; ... })`

### Properties

- `capabilities: EventBridgeCapabilities` — Runtime capability matrix used for strict startup validation.
- `config: Complete<EventBridgeConfig<ConfigType>>`
- `defaultCommandTimeout: number` — The default time until when a command invocation automatically returns a time out error
- `hasStarted: boolean`
- `healthy: boolean`
- `inFlightExecutions: InFlightExecutionTracker`
- `instanceId: string` — Stable runtime instance id used to distinguish bridge processes.
- `logger: Logger`
- `metricsRecorder: PuristaMetricsRecorder`
- `name: string` — Human-readable bridge name used in logs, traces, and metrics.
- `pendingInvocations: PendingInvocationRegistry<unknown>`
- `pendingStreams: PendingStreamRegistry<any, any>`
- `readStream: Readable`
- `serviceFunctions: Map<string, (message: { contentEncoding: string; contentType: string; correlationId: string; eventName: string; id: string; messageType: Command; ... }) => Promise<{ contentEncoding: unknown; contentType: unknown; correlationId: unknown; eventName: unknown; id: unknown; isHandledError: unknown; ... } | { contentEncoding: unknown; contentType: unknown; correlationId: unknown; eventName: unknown; id: unknown; messageType: unknown; ... }>>`
- `streamFunctions: Map<string, (message: StreamMessage) => Promise<void>>`
- `subscriptions: Map<string, SubscriptionStorageEntry>`
- `traceProvider: NodeTracerProvider`
- `writeStream: Writable`

### Methods

- `destroy(): Promise<void>` — Shut down event bridge as gracefully as possible
- `emitMessage(message: Omit<EBMessage, "id" | "timestamp" | "correlationId">): Promise<Readonly<EBMessage>>` — Emit a new message to event bridge to be delivered to receiver
- `getInFlightExecutionCount(): number` — Number of currently running handlers across all work kinds.
- `getInFlightExecutionCounts(): InFlightExecutionCounts` — Number of currently running handlers grouped by work kind.
- `getPausedSubscriptionConsumers(): PausedSubscriptionConsumersByRegistrationKey` — Returns paused subscription consumer states keyed by adapter registration key.
- `getTracer(): Tracer` — Returns open telemetry tracer of this service
- `invoke<T>(input: Omit<Command, "id" | "messageType" | "timestamp" | "correlationId">, commandTimeout: number): Promise<T>` — Call a command of a service and return the result of this command
- `isHealthy(): Promise<boolean>` — Indicates if the eventbridge is running and works correctly
- `isReady(): Promise<boolean>` — Indicates if the eventbridge has been started and is connected to underlaying message broker
- `openStream<Chunk, Final>(input: Omit<StreamOpenRequest, "id" | "messageType" | "timestamp" | "correlationId">, commandTimeout: number): Promise<StreamHandle<Chunk, Final>>` — Open a stream invocation.
- `registerCommand(address: EBMessageAddress, cb: (message: { contentEncoding: string; contentType: string; correlationId: string; eventName: string; id: string; messageType: Command; ... }) => Promise<{ contentEncoding: "utf-8"; contentType: "application/json"; correlationId: string; eventName: string; id: string; isHandledError: boolean; ... } | { contentEncoding: string; contentType: string; correlationId: string; eventName: string; id: string; messageType: CommandSuccessResponse; ... }>, metadata: CommandDefinitionMetadataBase): Promise<string>` — Register a service command and ensure that there is a queue for all incoming command requests.
- `registerStream(address: EBMessageAddress, cb: (message: StreamMessage) => Promise<void>, metadata: StreamDefinitionMetadataBase): Promise<string>` — Register a service stream handler for a service target.
- `registerSubscription(subscription: Subscription, cb: (message: EBMessage) => Promise<Omit<{ contentEncoding: unknown; contentType: unknown; correlationId: unknown; eventName: unknown; id: unknown; messageType: unknown; ... }, unknown | unknown> | undefined>): Promise<string>` — Register a new subscription.
- `resumeSubscriptionConsumer(_registrationKey: string): Promise<void>` — Resumes a paused subscription consumer by registration key.
- `runInFlight<T>(fn: () => Promise<T>, kind: "stream" | "command" | "subscription" | "generic"): Promise<T>`
- `start(): Promise<void>` — Start the eventbridge and connect to the underlaying message broker
- `startActiveSpan<F>(name: string, opts: SpanOptions, context: Context | undefined, fn: (span: Span) => Promise<F>): Promise<F>` — Start a child span for opentelemetry tracking
- `unregisterCommand(address: EBMessageAddress): Promise<void>` — Unregister a service command
- `unregisterStream(address: EBMessageAddress): Promise<void>` — Unregister a service stream
- `unregisterSubscription(address: EBMessageAddress): Promise<void>` — Unregister a subscription.
- `waitForInFlightDrain(timeoutMs: number): Promise<boolean>`
- `wrapInSpan<F>(name: string, opts: SpanOptions, fn: (span: Span) => Promise<F>, context?: Context): Promise<F>` — Start span for opentelemetry tracking on same level.
The created span will not become the "active" span within opentelemetry!