CODEWITHSUNDEEP
c#asp.net-mvcrazorsingletonfactory
Ozzy
Ozzy

Reputation: 974

MVC4 C# Project: Provide a single instance of an object across the application

Background I am going to provide the background here before posing my actual question:

I am working on an ASP.NET MVC 4 project in C#. The current development task I am busy with is to implement RazorMachine (https://github.com/jlamfers/RazorMachine) in this web application in order to leverage the use of the Razor engine in my application layer (as opposed to purely in the MVC web layer). I have successfully implemented RazorMachine in a series of Test Fixtures and all is working great. Now, I need to implement it into my application architecture inside my application layer.

In his CodeProject article on RazorMachine (http://www.codeproject.com/Articles/423141/Razor-2-0-template-engine-supporting-layouts), Jaap Lamfers states "Please note that normally for performance reasons at any application you would create a singleton instance of RazorMachine (because of the inner instance bound JIT created type caching)".

A very basic example of the code in action is as follows:

RazorMachine rm = new RazorMachine();
ITemplate template = rm.ExecuteContent("Razor says: Hello @Model.FirstName @Model.LastName", 
  new {FirstName="John", LastName="Smith"});
Console.WriteLine(template.Result);

You can view more code samples on the CodeProject site.

With this as background, my question is as follows:

What is the best way to provide a single instance of the RazorMachine object to my MVC application?

Let me state that I am aware of the Singleton and Factory patterns and their possible implementations. However, using Singleton doesn't seem to sit right as I am not writing the class from scratch, the class already exists. Factory also seems to not be wholly appropriate, but I would like to hear what others say.

All input will be greatly appreciated.

Upvotes: 0

Views: 697

Answers (1)

Allen Firth
Allen Firth

Reputation: 138

THe quickest, easiest way to get a singleton instance of RazorMachine is to use your DI container of choice, examples of well known DI containers are Autofac, Ninject, Castle Windsor, Unity, StructureMap (see this link for a performance comparision of major .NET Ioc/DI containers: http://www.palmmedia.de/blog/2011/8/30/ioc-container-benchmark-performance-comparison)

These containers abstract away from you the developer the responsibility to correctly implementing the Singleton pattern.

Using Autofac, to register a singleton instance of a class you would do the following:

var builder = new ContainerBuilder();
builder.RegisterType<YourClassGoesHere>().SingleInstance();

Ref:http://autofac.readthedocs.org/en/latest/lifetime/instance-scope.html#single-instance

Upvotes: 1

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