internal EventSourcedEntityHandler(AnySupport anySupport, IEventSourcedContext context, IBehaviorResolver behaviorReflectionCache, Func <IEventSourcedEntityCreationContext, object> entityCreationFactory = null)
{
AnySupport = anySupport;
Context = context;
EntityCreationFactory = entityCreationFactory;
BehaviorReflectionCache = behaviorReflectionCache;
var explicitBehaviors = Option.None <object[]>();
var active = true;
void Become(object[] behaviors)
{
// ReSharper disable once AccessToModifiedClosure
if (!active)
{
throw new InvalidOperationException("Context is not active!");
}
explicitBehaviors = Option.Some(ValidateBehaviors(behaviors).ToArray());
}
var ctx = new EventSourcedEntityCreationContext(context, Become);
var entity = EntityCreationFactory(ctx);
active = false;
CurrentBehaviors = explicitBehaviors.Match(behaviors => behaviors, () => new[] { entity });
}
private Option <BySlugResult, Error> MapSlugResultByArticleOrError(Article entity)
{
try
{
var view = _mapper.Map <ArticleView>(entity);
return(new BySlugResult
{
HasResult = true,
View = view
}.Some <BySlugResult, Error>());
}
catch (Exception)
{
return(Option.None <BySlugResult, Error>(
Error.Critical("Unexpected error occured when mapping the article to view.")));
}
}
/// <summary> /// Empties an optional if a specified condition /// is not satisfied. /// </summary> /// <param name="condition">The condition.</param> /// <returns>The filtered optional.</returns> public Option <T> Filter(bool condition) => hasValue && !condition?Option.None <T>() : this;
/// <summary> /// Empties an optional if the value is null. /// </summary> /// <returns>The filtered optional.</returns> public Option <T> NotNull() => hasValue && value == null?Option.None <T>() : this;
public static ValueTask <Option <T> > FilterAsync <T>(this Option <T> option, Func <T, ValueTask <bool> > predicate) =>
option.MatchAsync(
async x => await predicate(x) ?
option :
Option.None <T>(),
() => option);
public static ValueTask <Option <T, TExceptionResult> > MapExceptionAsync <T, TException, TExceptionResult>(this Option <T, TException> option, Func <TException, ValueTask <TExceptionResult> > mapping) =>
option.MatchAsync(
some: val => new ValueTask <Option <T, TExceptionResult> >(Option.Some <T, TExceptionResult>(val)),
none: async err => Option.None <T, TExceptionResult>(await mapping(err)));
public static ValueTask <Option <TResult> > MapAsync <T, TResult>(this Option <T> option, Func <T, ValueTask <TResult> > mapping) =>
option.MatchAsync(
some: async val => (await mapping(val)).Some <TResult>(),
none: () => Option.None <TResult>());
public static ValueTask <Option <TResult, TException> > MapAsync <T, TException, TResult>(this ValueTask <Option <T, TException> > option, Func <T, ValueTask <TResult> > mapping) =>
option.MatchAsync(
some: async val => (await mapping(val)).Some <TResult, TException>(),
none: err => new ValueTask <Option <TResult, TException> >(Option.None <TResult, TException>(err)));
public static ValueTask <Option <TResult, TException> > FlatMapAsync <T, TException, TResult>(this Option <T> option, Func <T, ValueTask <Option <TResult, TException> > > mapping, TException exception) =>
option.MatchAsync(
some: async val => await mapping(val),
none: () => Option.None <TResult, TException>(exception));
public static ValueTask <Option <TResult> > FlatMapAsync <T, TResult>(this ValueTask <Option <T> > option, Func <T, ValueTask <Option <TResult> > > mapping) =>
option.MatchAsync(
some: async val => (await mapping(val)),
none: () => new ValueTask <Option <TResult> >(Option.None <TResult>()));
public static ValueTask <Option <T, TException> > FilterAsync <T, TException>(this Option <T, TException> option, Func <T, ValueTask <bool> > predicate, TException exception) =>
option.MatchAsync(
async x => await predicate(x) ?
option :
Option.None <T, TException>(exception),
_ => option);
