mchechulnikov / photosphere-servlocgen

Simple design-time ServiceLocator generator for using in T4 templates.

Photosphere.ServiceLocatorGeneration

Simple design-time ServiceLocator generator. May be useful for simple applications with minimum dependencies.

Status

Install via NuGet

PM> Install-Package Photosphere.ServiceLocatorGeneration

How to use in T4 template?

<#@ template debug="false" hostspecific="true" language="C#" #>
<#@ output extension=".generated.cs" #>
<#@ assembly name="System.Core" #>
<#@ assembly name="System.Collections" #>
<#@ assembly name="$(ProjectDir)$(OutDir)Photosphere.ServiceLocatorGeneration.dll" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ import namespace="Photosphere.ServiceLocatorGeneration" #>
<#=
new ServiceLocatorGenerator(new ServiceLocatorConfiguration
{
	HostProvidedPath = Host.ResolvePath(string.Empty),
	Parameters = new Dictionary<string, string> { { "IConfiguration", "configuration" } },
	ServicesTypesNames = new [] { "IFoo", "IBar" }
}).Generate()
#>

In a result we'll be have something like this

using System;
using System.Collections.Generic;

namespace TestAssemblies
{
	internal class ServiceLocator
	{
		private readonly IDictionary<Type, object> _map = new Dictionary<Type, object>();

		public ServiceLocator(IConfiguration configuration)
		{
			var qiz = new Qiz();
			var bar = new Bar(qiz);
			_map.Add(typeof(IBar), bar);
			var foo = new Foo(bar, buz);
			_map.Add(typeof(foo), foo);
		}

		public T Get<T>() where T : class => (T) _map[typeof(T)];
	}
}

Example of using

var serviceLocatpr = new ServiceLocator(new Configuration());

var bar = serviceLocator.Get<IBar>();
var foo = serviceLocator.Get<IFoo>();

Warning!

Friend, remember: service locator pattern is evil! It's only for projects that have to be a fast start. Service locator instance must be used only near entry point or root of application.

Another example

You can see my DI framework code: ServiceLocator.cs.