Comments: (27)
It seems there is a size bug 'Download (111.90 MB) (10:12) (960x600)' |
Yea, thanks. I will fix that now. It should only be 11.90 mb |
A Little more Refactoring, you could have used an interface instead of a base class so that it becomes open for extension but closed for modification. |
You are 100% correct and I debated internally on which method to take. To be honest if this were real code i would have actually done both. This way I could have the abstract class to implement any common features and the interface for cleaner separation |
Does a dependency injection play exist with this? I'm trying to grok this and when the logging service defines its strategies in the DefineStategies() method is seems a little coupled, but then again, are those things that would be appropriate to couple? I might be confusing some things here ... |
@Eric, You could use DI for this. In fact by injecting the correct logger you would be taking the strategy pattern to the next step. For this I tried to keep the demo simple and was only trying to show one angle on this. Like most code demos there are many ways to do it differently. |
@Dimecasts Thanks. Just making sure I was on the right page. I totally understand with keeping the demos simple. Do you think their could be a follow up cast showing the progression with this by way of introducing some DI? I guess the thing I'm struggeling with is that if you start injecting your strategies into the your context what, then, is the point of the context? ... my head hurts ... |
@Eric, Actually tomorrows episode #99 showing how to refactor the SOLID episode on DI to use an IoC container. Let me know if this helps at all |
I'd say that the DefineStrategies() violates the intent of the Strategy Pattern in that the client should not have coupling to the individual strategies, and that this solution therefore violates the OCP. The excercise is in principle done before the DefineStrategies method was written, at which point the question is how to inject the dependancy. As it turned out, any consumer to this new class would have a build dependancy to all loggers in existence. But the presenter did state that one intended feature was to preserve the user interface, which makes it problematic to transition to a model where the the consumer instantiates the strategy. |
This looks to me more like using a service locator which is implemented using the dictionary than a strategy pattern. To me the LoggingService would be the context and ILogginStrategy with the 2 methods (LogMessage and LogError)". And 3 concrete implementations (EventLoggingStrategy, RepositoryLoggingStrategy, ...). The LoggingStrategy enum should be removed as it doesn't service a purpose.
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Very nice screen cast - thank you.
Just one question, where do you define the LoggingStrategy enum in your code? |
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