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ProductIndexActor.cs
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ProductIndexActor.cs
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using System.Collections.Immutable;
using Akka.Actor;
using Akka.Cluster.Tools.Singleton;
using Akka.Event;
using Akka.Persistence.Query;
using Akka.Persistence.Query.Sql;
using Akka.Streams;
using Akka.Streams.Dsl;
using SqlSharding.Shared;
using SqlSharding.Shared.Queries;
namespace SqlSharding.Host.Actors;
/// <summary>
/// Uses Akka.Persistence.Query to index all actively maintained <see cref="ProductTotalsActor"/>.
/// </summary>
public sealed class ProductIndexActor : ReceiveActor
{
private readonly ILoggingAdapter _logging = Context.GetLogger();
private readonly IActorRef _shardRegion;
private ImmutableDictionary<string, ProductData> _productIds = ImmutableDictionary<string, ProductData>.Empty;
public ProductIndexActor(IActorRef shardRegion)
{
_shardRegion = shardRegion;
Receive<ProductFound>(found =>
{
_logging.Info("Found product [{0}]", found);
_productIds = _productIds.Add(found.ProductId, ProductData.Empty);
_shardRegion.Tell(new FetchProduct(found.ProductId));
});
Receive<FetchResult>(result =>
{
_logging.Info("Received product state for product [{0}]", result.State.ProductId);
_productIds = _productIds.SetItem(result.State.ProductId, result.State.Data);
});
Receive<FetchAllProducts>(f =>
{
Sender.Tell(new FetchAllProductsResponse(_productIds.Values.ToList()));
});
Receive<Done>(_ =>
{
// this should never happen
throw new InvalidOperationException("SHOULD NOT REACH END OF ID STREAM");
});
}
private readonly record struct ProductFound(string ProductId);
private sealed class Done
{
public static readonly Done Instance = new();
private Done()
{
}
}
protected override void PreStart()
{
/*
* Kicks off an Akka.Persistence.Query instance that will continuously
*/
var query = Context.System.ReadJournalFor<SqlReadJournal>(SqlReadJournal.Identifier);
query.PersistenceIds()
.Where(c => c.StartsWith(ProductTotalsActor.TotalsEntityNameConstant))
.Select(c =>
{
var splitPivot = c.IndexOf("-", StringComparison.Ordinal);
return new ProductFound(c[(splitPivot + 1)..]);
})
.To(Sink.ActorRef<ProductFound>(Self, Done.Instance))
.Run(Context.Materializer());
}
}