daprlabs / Orleans.Journal

Event Sourcing for Microsoft Orleans (https://github.com/dotnet/orleans)

NOTE: This repository is obsolete and will not work on current versions of Orleans!

Orleans.Journal

Event Sourcing for Microsoft Orleans (https://github.com/dotnet/orleans)

Usage

Grain implementations must have the [JournalProvider("SomeCloudConfigProperty")] attribute, where the provider is the name of a property defined in the Azure Cloud Service's Configuration.

Providers take the format: Provider=AssemblyQualifiedClassNameOfProvider;OtherSetting=OtherValue;YetAnotherSetting=YetAnotherValue

Example: Provider=Orleans.Journal.AzureTable.AzureTableJournal,Orleans.Journal.AzureTable;Table=grainJournal;ConnectionStringSetting=JournalConnection

• Derive grain implementation from JournaledGrainBase<TGrain, TGrainState>.
• Persist a message with await this.Journal.WriteJournal();.
• Access state by modifying this.State.Value.

See StackGrain.cs for an example of usage. Something akin to this:

[JournalProvider("DefaultJournal")]
public class StackGrain : JournaledGrainBase<StackGrain, Stack<int>>, IStackGrain
{
    public async Task<int> GetSize()
    {
        return this.State.Value.Count;
    }

    public async Task Push(int value)
    {
        await this.Journal.WriteJournal();
        this.State.Value.Push(value);
    }

    public async Task<int> Pop()
    {
        await this.Journal.WriteJournal();
        return this.State.Value.Pop();
    }
}

License

Please see the included LICENSE file. Note that the contents of the Dependencies folder are licensed separately and contain their own license file.