0.4.1

• Fix Microsoft.Extensions.Logging.ILoggerFactory logging support
• Add InMemory snapshot store and journal persistence support

Due to a bad API design, we're rolling back the Microsoft.Extensions.Logging.ILoggerFactory logger support introduced in version 0.4.0, the 0.4.0 NuGet version is now considered as deprecated in support of the new API design introduced in version 0.4.1.

Logger Configuration Support

You can now use the new AkkaConfigurationBuilder extension method called ConfigureLoggers(Action<LoggerConfigBuilder>) to configure how Akka.NET logger behave.

Example:

builder.Services.AddAkka("MyActorSystem", configurationBuilder =>
{
    configurationBuilder
        .ConfigureLoggers(setup =>
        {
            // Example: This sets the minimum log level
            setup.LogLevel = LogLevel.DebugLevel;
            
            // Example: Clear all loggers
            setup.ClearLoggers();
            
            // Example: Add the default logger
            // NOTE: You can also use setup.AddLogger<DefaultLogger>();
            setup.AddDefaultLogger();
            
            // Example: Add the ILoggerFactory logger
            // NOTE:
            //   - You can also use setup.AddLogger<LoggerFactoryLogger>();
            //   - To use a specific ILoggerFactory instance, you can use setup.AddLoggerFactory(myILoggerFactory);
            setup.AddLoggerFactory();
            
            // Example: Adding a serilog logger
            setup.AddLogger<SerilogLogger>();
        })
        .WithActors((system, registry) =>
        {
            var echo = system.ActorOf(act =>
            {
                act.ReceiveAny((o, context) =>
                {
                    Logging.GetLogger(context.System, "echo").Info($"Actor received {o}");
                    context.Sender.Tell($"{context.Self} rcv {o}");
                });
            }, "echo");
            registry.TryRegister<Echo>(echo); // register for DI
        });
});

A complete code sample can be viewed here.

Exposed properties are:

• LogLevel: Configure the Akka.NET minimum log level filter, defaults to InfoLevel
• LogConfigOnStart: When set to true, Akka.NET will log the complete HOCON settings it is using at start up, this can then be used for debugging purposes.

Currently supported logger methods:

• ClearLoggers(): Clear all registered logger types.
• AddLogger<TLogger>(): Add a logger type by providing its class type.
• AddDefaultLogger(): Add the default Akka.NET console logger.
• AddLoggerFactory(): Add the new ILoggerFactory logger.

Microsoft.Extensions.Logging.ILoggerFactory Logging Support

You can now use ILoggerFactory from Microsoft.Extensions.Logging as one of the sinks for Akka.NET logger. This logger will use the ILoggerFactory service set up inside the dependency injection ServiceProvider as its sink.

Microsoft.Extensions.Logging Log Event Filtering

There will be two log event filters acting on the final log input, the Akka.NET akka.loglevel setting and the Microsoft.Extensions.Logging settings, make sure that both are set correctly or some log messages will be missing.

To set up the Microsoft.Extensions.Logging log filtering, you will need to edit the appsettings.json file. Note that we also set the Akka namespace to be filtered at debug level in the example below.

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information",
      "Akka": "Debug"
    }
  }
}

InMemory Snapshot Store And Journal Support

You can now use these AkkaConfigurationBuilder extension methods to enable InMemory persistence back end:

• WithInMemoryJournal(): Sets the InMemory journal as the default journal persistence plugin
• WithInMemorySnapshotStore(): Sets the InMemory snapshot store as the default snapshot-store persistence plugin.