Example Usage

Displaying the frame rate, just once, from video when it is decoded:

Pipeline( ...
          DiracDecoder(),
          FirstOnly(),
          SimpleDetupler("frame_rate"),
          ConsoleEchoer(),
        )

Behaviour

The first data item sent to FirstOnly's "inbox" inbox is immediately sent on out of its "outbox" outbox.

Any subsequent data sent to its "inbox" inbox is discarded.

If a producerFinished or shutdownMicroprocess message is received on the "control" inbox. It is immediately sent on out of the "signal" outbox and the component then immediately terminates.

class FirstOnly(Axon.Component.component)

FirstOnly() -> new FirstOnly component.

Passes on the first item sent to it, and discards everything else.