Class ReducerTypeExtensions

Namespace

Cratis.Chronicle.Reducers

Assembly

Cratis.Chronicle.dll

Extension methods for working with reducer types.

public static class ReducerTypeExtensions

Inheritance

object

ReducerTypeExtensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Methods

GetEventSequenceId(Type, string?)

Get the event sequence id for a reducer type.

public static EventSequenceId GetEventSequenceId(this Type type, string? currentEventStoreName = null)

Parameters

type Type

Type to get from.

currentEventStoreName string

The name of the event store the reducer is registered in. When provided, event types that belong to the same store will resolve to the event log rather than an inbox sequence.

Returns

EventSequenceId

The EventSequenceId for the type.

Exceptions

MultipleEventStoresDefined

Thrown when the reducer handles event types from multiple event stores.

GetHandlerEventTypes(Type)

Get all event types used in the handler method signatures of a reducer type.

public static IEnumerable<Type> GetHandlerEventTypes(this Type type)

Parameters

type Type

Type to get from.

Returns

IEnumerable<Type>

All event types found as first parameters in handler methods.

Remarks

A handler method is any non-special public or non-public instance method whose first parameter type carries the EventTypeAttribute. Duplicates are removed so each event type appears at most once.

GetReadModelType(Type)

Get the type of the read model for a reducer.

public static Type GetReadModelType(this Type type)

Parameters

type Type

Reducer type to get for.

Returns

Type

Type of read model.

GetReducerId(Type)

Get the reducer id for a type.

public static ReducerId GetReducerId(this Type type)

Parameters

type Type

Type to get from.

Returns

ReducerId

The ReducerId for the type.

HasExplicitEventSequence(Type)

Get whether a reducer type has an explicit event sequence set.

public static bool HasExplicitEventSequence(this Type type)

Parameters

type Type

Type to check.

Returns

bool

true if an explicit event sequence is configured; otherwise false.

IsActive(Type)

Get whether a reducer is active.

public static bool IsActive(this Type type)

Parameters

type Type

Type to get from.

Returns

bool

True if it is, false if not.

IsReducerMethod(MethodInfo, Type, IEnumerable<Type>)

Check if a MethodInfo is a reducer method.

public static bool IsReducerMethod(this MethodInfo methodInfo, Type readModelType, IEnumerable<Type> eventTypes)

Parameters

methodInfo MethodInfo

MethodInfo to check.

readModelType Type

Type of read model.

eventTypes IEnumerable<Type>

Known event types in the process.

Returns

bool

True if it is a reducer method, false if not.

Remarks

The following are considered valid reducer method signatures.

Task<TReadModel> {MethodName}(TEvent event, TReadModel? initial, EventContext context) Task<TReadModel> {MethodName}(TEvent event, TReadModel? initial) TReadModel {MethodName}(TEvent event, TReadModel? current, EventContext context) TReadModel {MethodName}(TEvent event, TReadModel? current)