private async Task OnDelete(ProjectorMap <TProjection, TKey, TContext> projector, Func <TEvent, TKey> getKey, TEvent anEvent, TContext context)
{
TKey key = getKey(anEvent);
bool deleted = await projector.Delete(key, context);
if (!deleted)
{
handleMissing(key, context);
}
}
/// <summary>
/// Builds the resulting event map.
/// </summary>
/// <remarks>
/// Can only be called once.
/// No changes can be made after the event map has been built.
/// </remarks>
/// <param name="projector">
/// Contains the handler that a projector needs to support to handle events from this map.
/// </param>
public IEventMap <TContext> Build(ProjectorMap <TContext> projector)
{
AssertNotBuilt();
if (projector == null)
{
throw new ArgumentNullException(nameof(projector));
}
if (projector.Custom == null)
{
throw new ArgumentException(
$"Expected the Custom property to point to a valid instance of {nameof(CustomHandler<TContext>)}", nameof(projector));
}
this.projector = projector;
return(eventMap);
}