Creates a SourceWithContext from an existing base SourceWithContext outputting an optional element and applying an additional viaFlow only if the element in the stream is defined.
Creates a SourceWithContext from an existing base SourceWithContext outputting an optional element and applying an additional viaFlow only if the element in the stream is defined.
'''Emits when''' the provided viaFlow is runs with defined elements
'''Backpressures when''' the viaFlow runs for the defined elements and downstream backpressures
'''Completes when''' upstream completes
'''Cancels when''' downstream cancels
Value parameters
combine
How to combine the materialized values of source and viaFlow
source
The base source that outputs an optional element
viaFlow
The flow that gets used if the optional element in is defined. This flow only works on the data portion of flow and ignores the context so this flow must not re-order, drop or emit multiple elements for one incoming element
Attributes
Returns
a SourceWithContext with the viaFlow applied onto defined elements of the flow. The output value is contained within an Option which indicates whether the original source's element had viaFlow applied.