fs2.concurrent

Stream aware, multiple producer, single consumer closeable channel.

Pure holder of a single value of type A that can be read in the effect F.

Pure holder of a single value of type A that can be both read and updated in the effect F.

The update methods have the same semantics as Ref, as well as propagating changes to discrete (with a last-update-wins policy in case of very fast updates).

The access method differs slightly from Ref in that the update function, in the presence of discrete, can return false and need looping even without any other writers.

Topic allows you to distribute As published by an arbitrary number of publishers to an arbitrary number of subscribers.

Topic has built-in back-pressure support implemented as the maximum number of elements (maxQueued) that a subscriber is allowed to enqueue.

Once that bound is hit, any publishing action will semantically block until the lagging subscriber consumes some of its queued elements.