Class IdentityEventAdapter

No-op model adapter which passes through the incoming events as-is.

Inheritance
object
IdentityEventAdapter
Implements
Inherited Members
Namespace: Akka.Persistence.Journal
Assembly: Akka.Persistence.dll
Syntax
[Serializable]
public sealed class IdentityEventAdapter : IEventAdapter, IWriteEventAdapter, IReadEventAdapter

Properties

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Instance

The singleton instance of IdentityEventAdapter.

Declaration
public static IdentityEventAdapter Instance { get; }
Property Value
Type Description
IdentityEventAdapter

Methods

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FromJournal(object, string)

Convert an event from its journal model to the application's domain model.

One event may be adapter into multiple(or none) events which should be delivered to the PersistentActor. Use the specialised Single(object) method to emit exactly one event, or Empty in case the adapter is not handling this event. Multiple IEventAdapter instances are applied in order as defined in configuration and their emitted event seqs are concatenated and delivered in order to the PersistentActor.

Declaration
public IEventSequence FromJournal(object evt, string manifest)
Parameters
Type Name Description
object evt

event to be adapted before delivering to the PersistentActor
string manifest

optionally provided manifest(type hint) in case the Adapter has stored one for this event. Use empty string if none.
Returns
Type Description
IEventSequence

sequence containing the adapted events (possibly zero) which will be delivered to the PersistentActor
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Manifest(object)

Return the manifest (type hint) that will be provided in the FromJournal(object, string) method. Use empty string if not needed.

Declaration
public string Manifest(object evt)
Parameters
Type Name Description
object evt

TBD
Returns
Type Description
string

TBD
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ToJournal(object)

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.

Declaration
public object ToJournal(object evt)
Parameters
Type Name Description
object evt

the application-side domain event to be adapted to the journal model
Returns
Type Description
object

the adapted event object, possibly the same object if no adaptation was performed

Implements

Extension Methods