Start a new SourceTOut, TMat from some resource which can be opened, read and closed. Interaction with resource happens in a blocking way. Example: {{{ Source.unfoldResource( () => new BufferedReader(new FileReader("...")), reader => Option(reader.readLine()), reader => reader.close()) }}} You can use the supervision strategy to handle exceptions for read function. All exceptions thrown by create or close will fail the stream. Restart supervision strategy will close and create blocking IO again. Default strategy is Stop which means that stream will be terminated on error in `read` function by default. You can configure the default dispatcher for this Source by changing the `akka.stream.blocking-io-dispatcher` or set it for a given Source by using CreateDispatcher(String).

public static Source<T, NotUsed> UnfoldResource<T, TSource>(
	Func<TSource> create,
	Func<TSource, Option<T>> read,
	Action<TSource> close
)

static member UnfoldResource : 
        create : Func<'TSource> * 
        read : Func<'TSource, Option<'T>> * 
        close : Action<'TSource> -> Source<'T, NotUsed>