Class StreamingQuerySourceAbstract

constructor

• new StreamingQuerySource(): StreamingQuerySource

  Returns StreamingQuerySource

Optionalcontext

referenceValue

statusEvents

status

• get status(): StreamingQuerySourceStatus

  Returns StreamingQuerySourceStatus

• set status(value: StreamingQuerySourceStatus): void

  Parameters

  • value: StreamingQuerySourceStatus

  Returns void

AbstractgetSelectorShape

• getSelectorShape(_context: IActionContext): Promise<FragmentSelectorShape>

  Get the selector type that is supported by this source.

  Parameters

  • _context: IActionContext

  Returns Promise<FragmentSelectorShape>

Abstracthalt

• halt(): void

  Returns void

AbstractqueryBindings

• queryBindings(
      _operation: Operation,
      _context: IActionContext,
      _options: undefined | IQueryBindingsOptions,
  ): BindingsStream

  Returns a (possibly lazy) stream that returns all bindings matching the operation.

  Passed operations MUST conform to the query shape exposed by the selector type returned from getSelectorShape. The given operation represents a Linked Data Fragments selector.

  The returned stream MUST expose the property 'metadata' of type MetadataBindings. The implementor is reponsible for handling cases where 'metadata' is being called without the stream being in flow-mode. This metadata object can become invalidated (see metadata.state), in which case the 'metadata' property must and will be updated.

  Parameters

  • _operation: Operation
  • _context: IActionContext
  • _options: undefined | IQueryBindingsOptions

  Returns BindingsStream

  The resulting bindings stream.

  See

  https://linkeddatafragments.org/specification/linked-data-fragments/#selectors

AbstractqueryBoolean

• queryBoolean(_operation: Ask, _context: IActionContext): Promise<boolean>

  Returns a promise resolving to the ask response of the given operation.

  This method should only be supported if the selector type returned from getSelectorShape supports ask queries.

  Parameters

  • _operation: Ask
  • _context: IActionContext

  Returns Promise<boolean>

  The resulting ask reply.

AbstractqueryQuads

• queryQuads(_operation: Operation, _context: IActionContext): AsyncIterator<Quad>

  Returns a (possibly lazy) stream that returns all quads matching the operation.

  This method should only be supported if the selector type returned from getSelectorShape supports construct queries.

  Parameters

  • _operation: Operation
  • _context: IActionContext

  Returns AsyncIterator<Quad>

  The resulting quads stream.

AbstractqueryVoid

• queryVoid(_operation: Update, _context: IActionContext): Promise<void>

  Returns a promise resolving when the given update operation succeeds.

  This method should only be supported if the selector type returned from getSelectorShape supports update queries.

  Parameters

  • _operation: Update
  • _context: IActionContext

  Returns Promise<void>

  The void response.

Abstractresume

• resume(): void

  Returns void