Facility to convert to specialised data models, as may be required by specialized persistence Journals.
Typical use cases include (but are not limited to):
- adding metadata, a.k.a. "tagging" - by wrapping objects into tagged counterparts
- manually converting to the Journals storage format, such as JSON, BSON or any specialised binary format
- splitting up large events into sequences of smaller ones
Thetype exposes the following members.
Return the manifest (type hint) that will be provided in themethod. Use empty string if not needed.
Convert domain event to journal event type.
Some journal may require a specific type to be returned to them, for example if a primary key has to be associated with each event then a journal may require adapters to return "EventWithPrimaryKey(event, key)".
The ToJournal(Object) adaptation must be an 1-to-1 transformation. It is not allowed to drop incoming events during the `toJournal` adaptation.