NewSharedStrategy returns a `SelectOption` that directs all request according to the given `keys`.

RoundRobin is a roundrobin strategy algorithm for node selection.

ScoreNodes returns a score for each node found in the given services.

WithCacheSeconds sets the seconds of cache ttl.

WithRegistry sets the registry used by the selector.

WithStrategy sets the default strategy for the selector.

Filter is used to filter a service during the selection process.

Next is a function that returns the next node based on the selector's strategy.

Strategy is a selection strategy e.g random, round robin.