Delegates

Delegate Action<IQuery<Request, Response>>) can be converted into IHandler with Handlers.Func().

// Create sum calculator
Action<IQuery<(int, int), int>> sumCalculator = q => q.Response.SetValue(q.Request.Item1 + q.Request.Item2);
// Cast to handler
IHandler<(int, int), int> handler = Handlers.Func(sumCalculator);
// Create service
IService<(int, int), int> service = Services.Create<(int, int), int>(handler);

Evaluation order can be passed as second parameter 'order:'.

// Cast to handler
IHandler<(int, int), int> handler = Handlers.Func(sumCalculator, order: 100);

Generic handler with delegate Action<IQuery>.

// Create query logger
Action<IQuery> queryLogger = q => Console.WriteLine(q.Response);
// Cast to handler
IHandler handler = Handlers.Func(queryLogger, order: long.MaxValue);

Async handler with Func<IQuery<Request, Response>, Task> and Func<IQuery, Task>.

// Create async handler
Func<IQuery<string, string>, Task> urlDownloader =
    async q => q.Response.SetValue(await new WebClient().DownloadStringTaskAsync(q.Request));
// Cast to handler
IHandlerAsync<string, string> handler = Handlers.FuncAsync(urlDownloader, order: 250);
// Create service
IService<string, string> service = Services.Create<string, string>(handler);

If delegate is provided to service construction as is, it's automatically casted into IHandler with evaluation order 0.

// Create async handler
Func<IQuery<string, string>, Task> urlDownloader =
    async q => q.Response.SetValue(await new WebClient().DownloadStringTaskAsync(q.Request));
// Create service
IService<string, string> service = Services.Create<string, string>(urlDownloader);

Full Example

Full example

#pragma warning disable SYSLIB0014 
using System;
using System.Net;
using System.Threading.Tasks;
using Avalanche.Service;

public class handler_delegates
{
    public static void Run()
    {
        {
            // <0>
            // Create sum calculator
            Action<IQuery<(int, int), int>> sumCalculator = q => q.Response.SetValue(q.Request.Item1 + q.Request.Item2);
            // Cast to handler
            IHandler<(int, int), int> handler = Handlers.Func(sumCalculator);
            // Create service
            IService<(int, int), int> service = Services.Create<(int, int), int>(handler);
            // </0>
        }

        {
            // Create sum calculator
            Action<IQuery<(int, int), int>> sumCalculator = q => q.Response.SetValue(q.Request.Item1 + q.Request.Item2);
            // <1>
            // Cast to handler
            IHandler<(int, int), int> handler = Handlers.Func(sumCalculator, order: 100);
            // </1>
            // Create service
            IService<(int, int), int> service = Services.Create<(int, int), int>(handler);
        }

        {
            // <2>
            // Create query logger
            Action<IQuery> queryLogger = q => Console.WriteLine(q.Response);
            // Cast to handler
            IHandler handler = Handlers.Func(queryLogger, order: long.MaxValue);
            // </2>
        }

        {
            // <3>
            // Create async handler
            Func<IQuery<string, string>, Task> urlDownloader =
                async q => q.Response.SetValue(await new WebClient().DownloadStringTaskAsync(q.Request));
            // Cast to handler
            IHandlerAsync<string, string> handler = Handlers.FuncAsync(urlDownloader, order: 250);
            // Create service
            IService<string, string> service = Services.Create<string, string>(handler);
            // </3>
            // Download
            string content = service.GetRequired("http://avalanche.fi");
            //
            Console.WriteLine(content);
        }

        {
            // <4>
            // Create async handler
            Func<IQuery<string, string>, Task> urlDownloader =
                async q => q.Response.SetValue(await new WebClient().DownloadStringTaskAsync(q.Request));
            // Create service
            IService<string, string> service = Services.Create<string, string>(urlDownloader);
            // </4>
        }
    }
}
#pragma warning restore SYSLIB0014