StructureMap Autowiring with two different instances of the same interface
- by Lambda
For the last two days, i tried my best to learn something about StructureMap, using an old project of mine as an concrete implementation example. I tried to simplify my question as much as possible. While i will post my examples in vb.net, answers with examples in C# are also okay.
The project includes an interfaces called IDatabase which connects itself to a Database. The important part looks like this.
Public Interface IDatabase
Function Connect(ByVal ConnectionSettings As ConnectionSettings) As Boolean
ReadOnly Property ConnectionOpen As Boolean
[... more functions...]
End Interface
Public Class MSSQLConnection
Implements IDatabase
Public Function Connect(ByVal ConnectionSettings As ConnectionSettings) As Boolean Implements IDatabase.Connect
[... Implementation ...]
End Function
[... more implementations...]
End Class
ConnectionSettings is a structure that has all the information needed to connect to a Database.
I want to open the Database Connection once and use it for every single connection in the project, so i register a instance in the ObjectFactory.
dim foo = ObjectFactory.GetInstance(Of MSSQLConnection)()
dim bar as ConnectionSettings
foo.connect(bar)
ObjectFactory.Configure(Sub(x) x.For(Of IDatabase).Use(foo))
Up until this part, everything works like a charm. Now, i get to a point where i hav e classes that need an additional instance of IDatabase because they connect to a second database.
Public Class ExampleClass
Public Sub New(ByVal SameOldDatabase as IDatabase, ByVal NewDatabase as IDatabase)
[...] Magic happens here [...]
End Sub
End Class
I want this second IDatabase to behave much like the first one. I want it to use a concrete, single instance and want to connect it to a different database invoking Connect with a different ConnectionSettings.
The problem is: While i'm pretty sure it's somewhow possible, (my initial idea was registering ExampleClass with alternative constructor arguments), i actually want to do it without registering ExampleClass. This probably involves more configuration, but i have no idea how to do it.
So, basically, it comes down to this question:
How do i configurate the ObjectFactory in a way that the autowiring always invokes the constructor with object Database1 for the first IDatabase parameter and object Database2 for the second one (if there is one?)
