Question

I have a web that was build using ASP.NET MVC 1.0. It uses Structuremap as an IOC container.
The IOC part works nice if I register it on Application_Start like this:

ObjectFactory.Initialize(service =>
    {
        service.ForRequestedType<IOrderRepository>()
               .TheDefaultIsConcreteType<OrderRepository>()
               .CacheBy(InstanceScope.PerRequest);
    });

I have to use the same backend in a Windows Service.

The service has some timers in it that access OrderRepository simultaneously, so threading is an issue here.

My first idea is to register it in the constructor of the service like this:

public Service1()
{
    ObjectFactory.Initialize(service =>
        {
            service.ForRequestedType<IOrderRepository>()
                   .TheDefaultIsConcreteType<OrderRepository>()
                   .CacheBy(InstanceScope.PerRequest);
        });
}

Is this the right place and the right parameter for caching?

Reading the documentation of Structuremap, I think the safest way is to use the default setting for Caching:

PerRequest – The default operation. A new instance will be created for each request.

I had the impression that PerRequest meant HttpContext, but thats another entry:

HttpContext – A single instance will be created for each HttpContext. Caches the instances in the HttpContext.Items collection.

Answer 1

Per this article: http://msdn.microsoft.com/en-us/library/system.serviceprocess.servicebase.aspx

The executable calls the ServiceBase derived class’s constructor the
first time you call Start on the service. The OnStart command-handling
method is called immediately after the constructor executes. The
constructor is not executed again after the first time the service has
been loaded, so it is necessary to separate the processing performed
by the constructor from that performed by OnStart. Any resources that
can be released by OnStop should be created in OnStart. Creating
resources in the constructor prevents them from being created properly
if the service is started again after OnStop has released the
resources.

It sounds like constructor is the way to go for the first time setup of structure map.