Package pt.unl.fct.di.novasys.babel2.events

@NullMarked package pt.unl.fct.di.novasys.babel2.events

Event hierarchy defining network states, message delivery outcomes, protocol notifications, and runtime lifecycle events in Babel 2.

All events implement BabelEvent, which partitions events into:

• ProtocolEvent — Base for application-level and timer events.
• NetworkEvent — Channel connectivity events (ConnectionUpEvent, ConnectionDownEvent, ConnectionFailedEvent).
• MessageEvent — Message delivery outcomes (MessageInEvent, MessageOutSuccessEvent, MessageOutFailedEvent).
• StartEvent — Delivered upon protocol initialization when the runtime starts.

Class	Description
BabelEvent	Root sealed interface for all events processed by the Babel runtime.
ConnectionDownEvent	NetworkEvent delivered to a protocol when a previously established connection to node has been closed.
ConnectionFailedEvent	NetworkEvent delivered to a protocol when an outgoing connection attempt to node failed before the connection could be established.
ConnectionUpEvent	NetworkEvent delivered to a protocol when an outgoing connection to node has been successfully established on the protocol's channel.
MessageEvent	Sealed interface representing the outcome of a message send or receive operation on a BabelChannel.
MessageInEvent	MessageEvent delivered when a BabelMessage arrives from a remote node.
MessageOutFailedEvent	MessageEvent delivered when an attempt to send a BabelMessage to a remote node failed.
MessageOutSuccessEvent	MessageEvent delivered when a previously sent BabelMessage was successfully handed off to the remote node.
NetworkEvent	Sealed interface representing connection lifecycle events generated by a BabelChannel.
ProtocolEvent	Marker interface for user-defined, application-level events exchanged between protocols.
StartEvent	Special BabelEvent delivered exactly once to each protocol when the Babel runtime starts (i.e., when Babel.init() is called).