Question

I am following this link:
http://codebetter.com/jpboodhoo/2007/10/15/the-static-gateway-pattern/
to understand the Gateway pattern.

The author shares a sample of the “gateway” logger class and related interfaces:

public class Log
{
    private static ILogFactory logFactory;

    public static void InitializeLogFactory(ILogFactory logFactory)
    {
        Log.logFactory = logFactory;
    }

    public void InformationalMessage(string informationalMessage)
    {
        logFactory.Create().InformationalMessage(informationalMessage);
    }
}

public interface ILogFactory
{
    ILog Create();
}

public interface ILog
{
    void InformationalMessage(string message);
}

This is the calling API

public class Calculator
{                
public int Add(int number1,int number2)
{
Log.InformationalMessage("About to add two numbers");            
return number1 + number2;
}
}

I am unable to understand where the initialization of the concrete logging class happens here. What is the entry point of the gateway?

Answer 1

With regards to concrete implementation of the Interfaces, there are examples at the bottom of the article which show how it can be implemented.