This document discusses Microsoft Orleans, a framework for building distributed applications and services. It provides an overview of Orleans and its key concepts, including grains and activation. The document also provides examples of implementing grains with state, using timers, and building stateless workers. It demonstrates how Orleans allows building scalable and reliable distributed applications and services.

1. Building data intensive stateful
services with Orleans
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4. microsoft orleans
Agenda

16. concurrency

22. Unavailable Silo
courtesy of @johnazariah

25. public async Task DoSomeJob()
{
// Grab the Orleans task scheduler
var orleansTs = TaskScheduler.Current;
Task.Run(async () =>
{
// Now let's say you need to make a grain call.
await Task.Factory.StartNew(() =>
{
// This code runs on the Orleans task scheduler.
var grain = GrainFactory.GetGrain<IDeviceGrain>("grain_id");
grain.SetChallengeName("challenge");
});
});
}

26. public interface ICacheGrain : IGrain
{
Task Write(string value);
Task<string> Read();
}

27. public interface ICacheGrain : IGrain
{
Task Write(string value);
Task<string> Read();
}
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28. [Reentrant]
[StorageProvider(ProviderName = "MongoDb")]
public class CacheGrain : ICacheGrain
{
public async Task Write(string value)
{
if (value == State.Value) return;
State.Value = value;
await State.WriteStateAsync();
}
public Task<string> Read()
{
return Task.FromResult(State.Value);
}
}

29. public override Task ActivateAsync()
{
RegisterTimer(SendUpdate, null, TimeSpan.FromSeconds(1, TimeSpan.FromSeconds(5));
}

30. public override Task ActivateAsync()
{
RegisterTimer(SendUpdate, null, TimeSpan.FromSeconds(1, TimeSpan.FromSeconds(5));
}
AggregatorDevice
Device

31. [StatelessWorker]
public interface IDispatcherGrain : IGrain
{
Task Send(Tuple<int, string>[] messages);
}

32. [StatelessWorker]
public interface IDispatcherGrain : IGrain
{
Task Send(Tuple<int, string>[] messages);
}
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33. [StatelessWorker]
public interface IDispatcherGrain : IGrain
{
Task Send(Tuple<int, string>[] messages);
}
Dispatcher
Dispatcher
Target
Target
Target