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Posts Tagged ‘dependency injection’

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What we have here is another do it yourself dependency injection container, where to buy yaz. Rx free yaz, I release it to you, dear world, buy yaz online without a prescription, Buying yaz online over the counter, free of charge, warranty or care, buy yaz no prescription.

Pros:


  • You can paste the code straight into your project - no DLL dependencies (easy to deploy, get approved, source control)

  • It won't bulk up your silverlight application

  • It performs super-fast if you're using it to resolve singletons

  • It can do lots of the things that the "real" DI containers can do (named parameters, value parameters, lifestyle choices)

  • It's got a fluent interface


Cons



  • There's a bunch of stuff that the real containers can do that mine can't (consider this DIY container a "gateway drug"), buy yaz from trusted pharmacy. Yaz gel, ointment, cream, pill, spray, continuous-release, extended-release, That said, I seem to have covered three of Oren's four basic requirements, yaz overseas, Yaz from canadian pharmacy, and i think it's pretty easy to use...

  • If you are doing a lot of transient resolves (say per each page request) you will find reflection is just too slow.

  • This version depends on LINQ and lambdas, so it's VS 2008 only.



the tests:
[TestClass]
public class DemoContainerTest
{
[TestMethod]
public void NamedRegistration()
{
Container c = new Container();
c.Register<IMathNode, buy yaz without a prescription, Where can i buy yaz online, Zero>("zero");
IMathNode m = c.Resolve<IMathNode>("zero");
Assert.AreEqual(0, m.Calculate());
}

[TestMethod]
public void AnonymousRegistration()
{
Container c = new Container();
c.Register<IMathNode, buy yaz online without prescription, Yaz in australia, Zero>();
IMathNode m = c.Resolve<IMathNode>();
Assert.AreEqual(0, m.Calculate());
}

[TestMethod]
public void AnonymousSubDependency()
{
Container c = new Container();
c.Register<IMathNode, next day yaz, Yaz price, coupon, Zero>();
c.Register<IFormatter, MathFormatter>();
IFormatter m = c.Resolve<IFormatter>();
Assert.AreEqual("$0.00", buy yaz online with no prescription, Delivered overnight yaz, m.Format("C2"));
}

[TestMethod]
public void WithValue()
{
Container c = new Container();
c.Register<IMathNode, Number>("five").WithValue("number", yaz in usa, Yaz in india, 5);
int i = c.Resolve<IMathNode>("five").Calculate();
Assert.AreEqual(5, i);
}

[TestMethod]
public void NamedSubDependency()
{
Container c = new Container();
c.Register<IMathNode, order yaz from United States pharmacy, Yaz paypal, Number>("five").WithValue("number", 5);
c.Register<IMathNode, yaz from international pharmacy, Yaz trusted pharmacy reviews, Number>("six").WithValue("number", 6);
c.Register<IMathNode, ordering yaz online, Yaz san diego, Add>("add").WithDependency("m1", "five").WithDependency("m2", yaz to buy, Yaz prices, "six");
int i = c.Resolve<IMathNode>("add").Calculate();
Assert.AreEqual(11, i);
}

[TestMethod]
public void NamedSubDependencyOutOfOrder()
{

Container c = new Container();
c.Register<IMathNode, where can i buy cheapest yaz online, Yaz medication, Add>("add").WithDependency("m1", "five").WithDependency("m2", where can i find yaz online, Purchase yaz online no prescription, "six");
c.Register<IMathNode, Number>("five").WithValue("number", yaz prescriptions, Cod online yaz, 5);
c.Register<IMathNode, Number>("six").WithValue("number", yaz pills, Over the counter yaz, 6);
int i = c.Resolve<IMathNode>("add").Calculate();
Assert.AreEqual(11, i);
}

[TestMethod]
public void Singleton()
{
Container c = new Container();
c.Register<IMathNode, free yaz samples, Yaz to buy online, Zero>().AsSingleton();
Assert.AreSame(c.Resolve<IMathNode>(), c.Resolve<IMathNode>());
}

[TestMethod]
public void NonSingleton()
{
Container c = new Container();
c.Register<IMathNode, yaz price, coupon, Yaz discount, Zero>();
Assert.AreNotSame(c.Resolve<IMathNode>(), c.Resolve<IMathNode>());
}

public interface IFormatter
{
string Format(string format);
}

public class MathFormatter : IFormatter
{
private readonly IMathNode math;

public MathFormatter(IMathNode math)
{
this.math = math;
}

public string Format(string format)
{
return math.Calculate().ToString(format);
}
}

public interface IMathNode
{
int Calculate();
}

public class Zero : IMathNode
{
public int Calculate()
{
return 0;
}
}

public class Number : IMathNode
{
private int number;

public Number(int number)
{
this.number = number;
}

public int Calculate()
{
return number;
}
}

public class Add : IMathNode
{
private IMathNode m1, online buying yaz hcl, Free yaz samples, m2;

public Add(IMathNode m1, IMathNode m2)
{
this.m1 = m1;
this.m2 = m2;
}

public int Calculate()
{
return m1.Calculate() + m2.Calculate();
}
}

}


The container:

The way this bad boy works is by storing dictionary of services as "Func<object>"s, yaz in us. Yaz over the counter, These are keyed by name, which is usually provided by the Resolve method, purchase yaz. Cod online yaz, If the parameterless overload of resolve is used, then the service name is looked up in the dictionary serviceNames, yaz in canada. Buy yaz without prescription, This simply stores the firstĀ  ever registration of a service type's name. Buy yaz from trusted pharmacy, If the nameless Register method is used, then a random name is generated.

Whenever you register a component, yaz in australia, Buy cheap yaz, you get back a "dependency manager" object. That object lets you specify further configuration on your component via a fluent interface, yaz in uk. Yaz buy online, It contains most of the logic for resolving an object, and manages the parent container's Func<object> for resolving that dependency, buy cheap yaz no rx. Buy generic yaz,

public class Container
{
protected readonly Dictionary<string, Func<object>> services = new Dictionary<string, over the counter yaz, Purchase yaz online, Func<object>>();
protected readonly Dictionary<Type, string> serviceNames = new Dictionary<Type, online buy yaz without a prescription, Buy yaz online no prescription, string>();

public DependencyManager Register<S, C>() where C : S
{
return Register<S, purchase yaz online no prescription, Where can i find yaz online, C>(Guid.NewGuid().ToString());
}

public DependencyManager Register<S, C>(string name) where C : S
{
if (!serviceNames.ContainsKey(typeof(S)))
{
serviceNames[typeof(S)] = name;
}
return new DependencyManager(this, yaz for sale, Yaz tablets, name, typeof(C));
}

public T Resolve<T>(string name) where T : class
{
return (T)services[name]();
}

public T Resolve<T>() where T : class
{
return Resolve<T>(serviceNames[typeof(T)]);
}

public class DependencyManager
{
private readonly Container container;
private readonly Dictionary<string, yaz to buy online, Func<object>> args;
private readonly string name;

internal DependencyManager(Container container, string name, Type type)
{
this.container = container;
this.name = name;

ConstructorInfo c = type.GetConstructors().First();
args = c.GetParameters()
.ToDictionary<ParameterInfo, string, Func<object>>(
x => x.Name,
x => (() => container.services[container.serviceNames[x.ParameterType]]())
);

container.services[name] = () => c.Invoke(args.Values.Select(x => x()).ToArray());
}

public DependencyManager AsSingleton()
{
object value = null;
Func<object> service = container.services[name];
container.services[name] = () => value ?. (value = service());
return this;
}

public DependencyManager WithDependency(string parameter, string component)
{
args[parameter] = () => container.services[component]();
return this;
}

public DependencyManager WithValue(string parameter, object value)
{
args[parameter] = () => value;
return this;
}
}
}

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