Created
January 21, 2013 16:24
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Ninject post-poned dependency initialization: factory, lazy loading, combination
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void Main() | |
{ | |
var kernel = new StandardKernel(); | |
kernel.Load<FuncModule>(); // for sake of LinqPAD | |
kernel.Bind<IDependencyFactory>().ToFactory(); | |
// wire concreet implementation of | |
kernel | |
.Bind<IDependency>() | |
.To<DependencyImpl1>() | |
.NamedLikeFactoryMethod((IDependencyFactory f) => f.GetJob()); | |
kernel | |
.Bind<Lazy<IDependency>>() | |
.To<Lazy<IDependency>>() | |
.NamedLikeFactoryMethod((IDependencyFactory f) => f.GetLazyJob()); | |
kernel | |
.Bind(typeof (Lazy<>)) | |
.ToMethod(context => | |
((ILazyLoader) Activator.CreateInstance(typeof (LazyLoader<>).MakeGenericType(context.GenericArguments), | |
new object[] { context.Kernel })).Loader); | |
var abstractFactory = kernel.Get<IDependencyFactory>(); | |
var dependencyUsingFactory = abstractFactory.GetJob(); | |
var lazyDependencyUsingFactory = abstractFactory.GetLazyJob(); | |
dependencyUsingFactory.Dump(); | |
lazyDependencyUsingFactory.Dump(); | |
lazyDependencyUsingFactory.Value.Dump(); | |
var lazyDependency = kernel.Get<Lazy<IDependency>>(); | |
lazyDependency.Dump(); | |
lazyDependency.Value.Dump(); | |
} | |
public abstract class IDependency { } | |
public class DependencyImpl1 : IDependency { } | |
public class DependencyImpl2 : IDependency { } | |
public interface IDependencyFactory | |
{ | |
IDependency GetJob(); | |
Lazy<IDependency> GetLazyJob(); | |
} | |
public interface ILazyLoader | |
{ | |
object Loader { get; } | |
} | |
public class LazyLoader<T> : ILazyLoader | |
{ | |
private readonly IKernel _kernel; | |
private static readonly Func<IKernel, Lazy<T>> _lazyLoader = k => new Lazy<T>(() => k.Get<T>()); | |
public LazyLoader(IKernel kernel) | |
{ | |
if (kernel == null) | |
throw new ArgumentNullException("kernel"); | |
_kernel = kernel; | |
} | |
public object Loader { get { return _lazyLoader(_kernel); } } | |
} |
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