WriteEventAdapter

All Known Subinterfaces:

EventAdapter

All Known Implementing Classes:

IdentityEventAdapter$
```
public interface WriteEventAdapter
```
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

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`manifest(java.lang.Object event)`	Return the manifest (type hint) that will be provided in the `fromJournal` method.
`java.lang.Object`	`toJournal(java.lang.Object event)`	Convert domain event to journal event type.

- Method Detail
  - manifest
```
java.lang.String manifest(java.lang.Object event)
```
    Return the manifest (type hint) that will be provided in the fromJournal method. Use "" if manifest is not needed.
  - toJournal
```
java.lang.Object toJournal(java.lang.Object event)
```
    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 com.example.myjournal.EventWithPrimaryKey(event, key).
    The toJournal adaptation must be an 1-to-1 transformation. It is not allowed to drop incoming events during the toJournal adaptation.
    
    Parameters:
    
    event - the application-side domain event to be adapted to the journal model
    
    Returns:
    
    the adapted event object, possibly the same object if no adaptation was performed