Head

Called by the next inbound Stage to signal interest in reading data.

Data that the next inbound Stage wants to send outbound.

Find the next outbound Stage with the given name, if it exists.

Find the next inbound Stage of type C, if it exists.

Receives inbound commands Override to capture commands.

Replace all remaining inbound Stages of the pipeline, not including this Stage.

Send a command to the next inbound Stage of the pipeline

Insert the MidStage after this

Collection of data that the next inbound Stage wants to sent outbound.

It is generally assumed that the order of elements has meaning.

Shuts down the stage, deallocating resources, etc.

It will be called when the stage receives a Disconnected command unless inboundCommand is overridden. This method should not send or Disconnected commands.

It is possible that this will not be called due to failure of other stages to propagate shutdown commands. Conversely, it is also possible for this to be called more than once due to the reception of multiple shutdown commands. It is therefore recommended that the method be idempotent.

Start the stage, allocating resources etc.

This method should not effect other stages by sending commands etc unless it creates them. It is not impossible that the stage will receive other commands besides Connected before this method is called. It is not impossible for this method to be called multiple times by misbehaving stages. It is therefore recommended that the method be idempotent.