Skip to main content

links.split

class SplitLink(TerminatingLink)

SplitLink is a link that splits the operation into two paths. The operation is sent to the left path if the predicate returns true, otherwise to the right path.

This is useful for exampole when implementing a cache link, where the operation is sent to the cache if it is a query, and to the network if it is a mutation. Or when subscriptions and queries are sent to different links (e.g. a websocket link and a http link).

left​

The link that is used if the predicate returns true.

The link that is used if the predicate returns false.

split​

The function used to split the operation. This function should return a boolean. If true, the operation is sent to the left path, otherwise to the right path.

split​

def split(left: TerminatingLink, right: TerminatingLink,
          split: Callable[[Operation], bool])

Splits a Link into two paths. Acording to a predicate function. If predicate returns true, the operation is sent to the left path, otherwise to the right path.