Event Transport Transaction Observation
Problem
ESPressio Event already exposes Observer notifications for a number of EventTransportManager lifecycle operations, including outbound Event acceptance, transport handoff, inbound packet acceptance or rejection, Event deserialization, and local dispatch.
These notifications are useful for operational awareness, but they expose primarily identifiers and status information. A higher-level diagnostics or monitoring component does not currently receive enough common transaction context to observe a Serializable Event throughout its transport lifecycle.
For example, a Serial monitoring library should be able to observe transported Events without implementing a transport itself or modifying every application Event type. It should be possible to identify the Event type, direction, transport, schema/message metadata, serialized payload where available, and the actual Event instance where one exists.
This requirement is not specific to Serial output. The same information could later be useful for diagnostics, tracing, telemetry, logging, persistence, or development tooling.
Ideal Solution
Extend the Event Transport observation model with a transport-neutral transaction abstraction representing a snapshot of an Event Transport operation at a particular stage in its lifecycle.
An Event Transport Observer should be able to receive a single unified transaction notification containing the relevant context available at that point, including:
- transaction stage;
- inbound or outbound direction;
- stable Event type identity;
- human-readable stable Event type name;
- Serializable schema version;
- transport message identity;
- concrete transport involved;
- Event dispatch metadata;
- local or remote origin information;
- serialized payload where available;
- the corresponding Event instance where available;
- transport acceptance/failure state where applicable.
The abstraction should represent the complete Event Transport lifecycle, including outbound acceptance and serialization, transport handoff, inbound acceptance or rejection, deserialization, and local dispatch.
Existing Event Transport Observer callbacks should remain available for compatibility.
Any Event or payload references exposed by a transaction snapshot should be non-owning and valid only for the duration of the Observer callback. Consumers that need to retain information must copy it themselves. Diagnostic observation must not alter normal Event ownership or transport-buffer lifetime.
The extension should remain representation-neutral. ESPressio Event should expose the Serializable Binary payload already produced by Event Transport where appropriate, but should not acquire JSON, Serial, logging, or other presentation-specific dependencies.
The resulting abstraction should allow libraries such as ESPressio Serial to implement monitoring entirely outside ESPressio Event while remaining reusable by future diagnostics and tracing components.
Event Transport Transaction Observation
Problem
ESPressio Event already exposes Observer notifications for a number of
EventTransportManagerlifecycle operations, including outbound Event acceptance, transport handoff, inbound packet acceptance or rejection, Event deserialization, and local dispatch.These notifications are useful for operational awareness, but they expose primarily identifiers and status information. A higher-level diagnostics or monitoring component does not currently receive enough common transaction context to observe a Serializable Event throughout its transport lifecycle.
For example, a Serial monitoring library should be able to observe transported Events without implementing a transport itself or modifying every application Event type. It should be possible to identify the Event type, direction, transport, schema/message metadata, serialized payload where available, and the actual Event instance where one exists.
This requirement is not specific to Serial output. The same information could later be useful for diagnostics, tracing, telemetry, logging, persistence, or development tooling.
Ideal Solution
Extend the Event Transport observation model with a transport-neutral transaction abstraction representing a snapshot of an Event Transport operation at a particular stage in its lifecycle.
An Event Transport Observer should be able to receive a single unified transaction notification containing the relevant context available at that point, including:
The abstraction should represent the complete Event Transport lifecycle, including outbound acceptance and serialization, transport handoff, inbound acceptance or rejection, deserialization, and local dispatch.
Existing Event Transport Observer callbacks should remain available for compatibility.
Any Event or payload references exposed by a transaction snapshot should be non-owning and valid only for the duration of the Observer callback. Consumers that need to retain information must copy it themselves. Diagnostic observation must not alter normal Event ownership or transport-buffer lifetime.
The extension should remain representation-neutral. ESPressio Event should expose the Serializable Binary payload already produced by Event Transport where appropriate, but should not acquire JSON, Serial, logging, or other presentation-specific dependencies.
The resulting abstraction should allow libraries such as ESPressio Serial to implement monitoring entirely outside ESPressio Event while remaining reusable by future diagnostics and tracing components.