/// <summary>
/// Creates an invalid instance of the given reactive entity kind with the given URI.
/// </summary>
/// <param name="uri">The URI.</param>
/// <param name="kind">The reactive entity kind.</param>
/// <returns>
/// The invalid instance, or null if an unexpected kind is provided.
/// </returns>
public static ReactiveEntity CreateInvalidInstance(Uri uri, ReactiveEntityKind kind)
{
return(kind switch
{
ReactiveEntityKind.Observable => ObservableDefinitionEntity.CreateInvalidInstance(uri),
ReactiveEntityKind.Observer => ObserverDefinitionEntity.CreateInvalidInstance(uri),
ReactiveEntityKind.Stream => SubjectEntity.CreateInvalidInstance(uri),
ReactiveEntityKind.StreamFactory => StreamFactoryDefinitionEntity.CreateInvalidInstance(uri),
ReactiveEntityKind.Subscription => SubscriptionEntity.CreateInvalidInstance(uri),
ReactiveEntityKind.ReliableSubscription => ReliableSubscriptionEntity.CreateInvalidInstance(uri),
ReactiveEntityKind.Template or ReactiveEntityKind.Other => OtherDefinitionEntity.CreateInvalidInstance(uri),
_ => null,
});
public bool TryLookupStreamFactory(IReactiveMetadata metadata, string key, out StreamFactoryDefinitionEntity entity)
{
if (metadata.StreamFactories.TryGetValue(new Uri(key), out IReactiveStreamFactoryDefinition streamFactoryDefinition))
{
var expression = _metadataRewrites.GetValue(
streamFactoryDefinition.Expression,
e => _queryEngine.RewriteQuotedReactiveToSubscribable(e));
entity = new StreamFactoryDefinitionEntity(streamFactoryDefinition.Uri, expression, streamFactoryDefinition.State);
return(true);
}
entity = null;
return(false);
}
private void AddEntityPlaceholder(ReactiveEntityKind kind, string key)
{
var uri = new Uri(key);
#pragma warning disable IDE0079 // Remove unnecessary suppression.
#pragma warning disable CA2000 // Dispose objects before losing scope. (Entities are owned by the registry.)
var added = kind switch
{
ReactiveEntityKind.Observable => Registry.Observables.TryAdd(key, ObservableDefinitionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.Observer => Registry.Observers.TryAdd(key, ObserverDefinitionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.Stream => Registry.Subjects.TryAdd(key, SubjectEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.StreamFactory => Registry.SubjectFactories.TryAdd(key, StreamFactoryDefinitionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.SubscriptionFactory => Registry.SubscriptionFactories.TryAdd(key, SubscriptionFactoryDefinitionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.Subscription => Registry.Subscriptions.TryAdd(key, SubscriptionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.ReliableSubscription => Registry.ReliableSubscriptions.TryAdd(key, ReliableSubscriptionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.Other => Registry.Other.TryAdd(key, OtherDefinitionEntity.CreateInvalidInstance(uri)),
ReactiveEntityKind.Template => Registry.Templates.TryAdd(key, OtherDefinitionEntity.CreateInvalidInstance(uri)),
_ => throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Cannot create an invalid entity '{0}' of type '{1}'.", key, kind)),
};
#pragma warning restore CA2000
#pragma warning restore IDE0079
if (added)
{
Parent.TraceSource.Registry_AddEntityPlaceholder(Parent.Uri, kind.ToString(), key);
}
}