The continuation given to IDataSourceExtension.readItems: reads the
items through the inner layers of the onion and the reader of the data
source. The signal of the read is bound already, hence the single
parameter: an extension never forwards it. Reentrant: callable zero, one
or several times, every call runs the inner layers again; once the read is
superseded it rejects with the AbortedException of ts-core.
The continuation given to IDataSourceExtension.readItems: reads the items through the inner layers of the onion and the reader of the data source. The signal of the read is bound already, hence the single parameter: an extension never forwards it. Reentrant: callable zero, one or several times, every call runs the inner layers again; once the read is superseded it rejects with the
AbortedExceptionof ts-core.