experiment creating and writing to two instances of memstate at the same time

cats-and-dogs-two-memstate-databases-at-once.linq

<Query Kind="Program">
  <NuGetReference>Memstate.Core</NuGetReference>
  <NuGetReference>Memstate.JsonNet</NuGetReference>
  <Namespace>Memstate.Configuration</Namespace>
  <Namespace>Memstate</Namespace>
  <Namespace>System.Threading.Tasks</Namespace>
</Query>

public class Cat { 
	public string Name { get; set;}
}

public class CatDB {
	public IDictionary<string, Cat> Cats { get; } = new Dictionary<string, Cat>();
}

public class Getcats : Query<CatDB, Cat[]>
{
	public override Cat[] Execute(CatDB model)
	{
		return model.Cats.Select(c => c.Value).ToArray();
	}
}

public class AddCat : Command<CatDB, Cat> {
	public string Name { get; set;}

	public override Cat Execute(CatDB model)
	{
		var cat = new Cat() { Name = Name };
		model.Cats.Add(cat.Name, cat);
		return cat;
	}
}

static async Task Main()
{
	var dir = new FileInfo(Util.CurrentQueryPath).Directory.FullName;
	var config = Config.Current;
	config.SerializerName = "Newtonsoft.Json";
	
	var settings = config.GetSettings<EngineSettings>();
	settings.MaxBatchSize = 1;
	settings.StreamName = Path.Combine(dir, "catdatabase");
	var catdb = Engine.Start<CatDB>().GetAwaiter().GetResult();
	
	
	
	Console.WriteLine("cat engine started");
	
	var cats =await catdb.Execute(new Getcats());
	Console.WriteLine("cats\n----\n");
	foreach(var c in cats) Console.WriteLine(c.Name);
	Console.WriteLine();
	
	var cat = await catdb.Execute(new AddCat() { Name = $"Frodor-{Guid.NewGuid().ToString().Substring(10, 5)}" });
	Console.WriteLine($"cat created: {cat.Name}");
	
	settings.StreamName = Path.Combine(dir, "dogdatabase");
	var dogdb = Engine.Start<CatDB>().GetAwaiter().GetResult();
	Console.WriteLine("dog engine started");

	var dogs = await dogdb.Execute(new Getcats());
	Console.WriteLine("dogs\n----\n");
	foreach (var d in dogs) Console.WriteLine(d.Name);
	Console.WriteLine();

	var cat2 = await catdb.Execute(new AddCat() { Name = $"Frodor-{Guid.NewGuid().ToString().Substring(10, 5)}" });
	Console.WriteLine($"cat created: {cat2.Name}");


	var dog1 = await dogdb.Execute(new AddCat() { Name = $"doggy-GANDALF-{Guid.NewGuid().ToString().Substring(10, 5)}" });
	Console.WriteLine($"dog created: {dog1.Name}");

	await catdb.DisposeAsync();
	await dogdb.DisposeAsync();
	Console.WriteLine("finished");
}

// Define other methods, classes and namespaces here

running the above a few times in a row, i.e. opening in linqpad and pressing F5 about 20 times produces the following output

cat engine started
cats
----

Frodor-f44-4
Frodor-1fa-4
Frodor-d49-4
Frodor-648-4
Frodor-ce3-4
Frodor-2fb-4
Frodor-ece-4
Frodor-9f6-4
Frodor-72f-4
Frodor-1cb-4
Frodor-172-4
Frodor-2a2-4
Frodor-abb-4
Frodor-b2b-4
Frodor-7fa-4
Frodor-dcb-4
Frodor-122-4

cat created: Frodor-d18-4
dog engine started
dogs
----

doggy-GANDALF-ba0-4
doggy-GANDALF-beb-4
doggy-GANDALF-93d-4
doggy-GANDALF-932-4
doggy-GANDALF-3b3-4
doggy-GANDALF-d78-4
doggy-GANDALF-ca6-4
doggy-GANDALF-3ae-4
doggy-GANDALF-575-4

cat created: Frodor-d78-4
dog created: doggy-GANDALF-495-4
finished