Scenic.PubSub.get-exclamation-mark
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get-exclamation-mark
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Specs
Retrieve the cached data value for a named data source.
Raises an error if the value is not registered
This data is pulled from an :ets
table and does not put load on the data source itself.
Parameters
source_id
an atom that is registered to a data source.
Return Value
data
If the data source is either not registered, or has not yet published any data, get returns
nil