We've implemented the adapter design pattern whose job is the following:
Item #3 is starting to worry me as the adapters are becoming more complicated than I'd originally imagined. I'm not aware of a design pattern to trim down an adapter. Is there one? Suggestions?
You've used what I like to call the "swiss army knife" pattern.
Best practice says you should break up your class into at least 3 classes, one for each concern.
Instead of using an adapter or a full Repository(CRUD operations), i would use an IReader interface for reading and visitor pattern for insert update delete, so you can separate domain logic from infraestructure(persistance) details, Here is the idea:
public class MyBusinessObject : IAcceptBusinessVisitor, IAcceptMyBusinessIdVisitor
{
private readonly string _id;
private string MyPrivateProp { get; set; }
//Fully encapsulated object
public MyBusinessObject(string id, string myPrivateProp)
{
_id = id;
MyPrivateProp = myPrivateProp;
}
public void UpdateMyProp(string newProp)
{
if (string.IsNullOrWhiteSpace(newProp)) throw new ArgumentNullException(nameof(newProp));
//Business rules ...
MyPrivateProp = newProp;
}
public void Accept(IMyBusinessObjectVisitor visitor)
{
if (visitor == null) throw new ArgumentNullException(nameof(visitor));
visitor.Visit(_id, MyPrivateProp);
}
public void Accept(IMyBusinessIdVisitor visitor)
{
if (visitor == null) throw new ArgumentNullException(nameof(visitor));
visitor.Visit(_id);
}
}
public interface IAcceptBusinessVisitor
{
void Accept(IMyBusinessObjectVisitor visitor);
}
public interface IAcceptMyBusinessIdVisitor
{
void Accept(IMyBusinessIdVisitor visitor);
}
public interface IMyBusinessObjectVisitor
{
void Visit(string id, string prop);
}
public interface IMyBusinessIdVisitor
{
void Visit(string id);
}
public class SavePersistanceVitor : IMyBusinessObjectVisitor
{
public void Visit(string id, string prop)
{
//Save to Database
}
}
public class UpdatePersistanceVitor : IMyBusinessObjectVisitor
{
public void Visit(string id, string prop)
{
//Update to Database
}
}
public class DeleteVitor : IMyBusinessIdVisitor
{
public void Visit(string id)
{
//Delete in Database
}
}
Here for Reading:
public interface IMyBusinessObjectReader
{
MyBusinessObject Read(string id);
}
class MyBusinessObjectReaderFromDb : IMyBusinessObjectReader
{
public MyBusinessObject Read(string id)
{
//Read from database
string myPrivateProp = "";
return new MyBusinessObject(id, myPrivateProp);
}
}
the next step could be adding generics for reading and the visitors. In this case you end up having little tiny classes and gain flexibility and the benefits of solid principles like single responsability, interface segregation, etc. So you can create a rich encapsulated domain and extend its functionality with some desing principles. Regards!
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