PubSub

Gets elements satisfying the selector, yielding when such an element is available.

A variant of get, that instead of returning one element will return multiple elements in form of stream.

Publishes one element. This completes after element was successfully published.

Creates a subscription for the supplied selector. If the subscription is not supported or not successful, this yields to false.

Like get, but instead of semantically blocking for a matching element, returns immediately with None if such an element is not available.

Tries to publish one element.

Evaluates to false if element was not published. Evaluates to true if element was published successfully.

Cancels a subscription previously registered with subscribe. Must be invoked if the subscriber will no longer consume elements.