Interface ICanResolveKeyForCommand

Namespace

Cratis.Arc.Commands

Assembly

Cratis.Arc.Core.dll

Defines a rule for reading the key a command identifies its target by.

public interface ICanResolveKeyForCommand

Extension Methods

MethodCalls.CallGenericMethod<TOut, T>(T, Expression<Func<T, Func<TOut>>>, params Type[])

MethodCalls.CallGenericMethod<TOut, T, T1>(T, Expression<Func<T, Func<T1, TOut>>>, T1, params Type[])

MethodCalls.CallGenericMethod<TOut, T, T1, T2>(T, Expression<Func<T, Func<T1, T2, TOut>>>, T1, T2, params Type[])

MethodCalls.CallGenericMethod<TOut, T, T1, T2, T3>(T, Expression<Func<T, Func<T1, T2, T3, TOut>>>, T1, T2, T3, params Type[])

ConverterExtensions.ConvertTo(object, Type)

ConceptExtensions.GetConceptValue(object)

ConceptExtensions.IsConcept(object)

JsonValueExtensions.ToJsonValue(object?)

ObservableExtensions.InvokeAndWrapWithSubject<TResult>(object, Func<CancellationToken, IObservable<TResult>>)

ObservableExtensions.InvokeAndWrapWithTransformSubject<TResult, TSource>(object, Func<CancellationToken, IObservable<TSource>>, Func<TSource, TResult>)

Remarks

Implementations are discovered, and each is asked in turn until one recognizes a key. The rule Arc ships is asked last, so an application that keys its commands its own way states that once as an implementation of this rather than per command.

This is only consulted when nothing has already resolved the command's key. An integration that owns key resolution — the Chronicle one, which resolves an event source id — writes the key onto the command context itself, and that stands.

Methods

Resolve(object)

Reads the key from a command.

string? Resolve(object command)

Parameters

command object

The command to read.

Returns

string

The key, or null when this rule recognizes none on the command.