Concrete subclass must implement this method to define how many messages that are currently in progress or queued.
Elements will be requested in minimum batches of this size.
Elements will be requested in minimum batches of this size. Default is 5. Subclass may override to define the batch size.
Invoked by the ActorSubscriber after each incoming message to determine how many more elements to request from the stream.
Invoked by the ActorSubscriber after each incoming message to determine how many more elements to request from the stream.
current remaining number of elements that have been requested from upstream but not received yet
demand of more elements from the stream, returning 0 means that no more elements will be requested for now
Requests up to the
max
and also takes the number of messages that have been queued internally or delegated to other actors into account. Concrete subclass must implement #inFlightInternally. It will request elements in minimum batches of the defined #batchSize.