static void Main(string[] args)
{
BaseLogHandler debugLog = new DebugHandler();
BaseLogHandler infoLog = new InfoHandler();
BaseLogHandler errorLog = new ErrorHandler();
BaseLogHandler fatalLog = new FatalHandler();
BaseLogHandler chainRoot = debugLog;
debugLog.SetNext(infoLog);
infoLog.SetNext(errorLog);
errorLog.SetNext(fatalLog);
chainRoot.Log("Debug msg", 4);
Console.WriteLine("==================");
chainRoot.Log("Info msg", 3);
Console.WriteLine("==================");
chainRoot.Log("Error msg", 2);
Console.WriteLine("==================");
chainRoot.Log("Fatal msg", 1);
//Build revers chain
BaseLogHandler reverseDebugLog = new DebugHandler();
BaseLogHandler reverseInfoLog = new InfoHandler();
BaseLogHandler reverseErrorLog = new ErrorHandler();
BaseLogHandler reverseFatalLog = new FatalHandler();
BaseLogHandler reverseChainRoot = reverseFatalLog;
reverseFatalLog.SetNext(reverseErrorLog);
reverseErrorLog.SetNext(reverseInfoLog);
reverseInfoLog.SetNext(reverseDebugLog);
Console.WriteLine("second chain");
chainRoot.Log("Debug msg", 4);
Console.WriteLine("==================");
chainRoot.Log("Info msg", 3);
Console.WriteLine("==================");
chainRoot.Log("Error msg", 2);
Console.WriteLine("==================");
chainRoot.Log("Fatal msg", 1);
}
public void SetNext(BaseLogHandler next)
{
this.next = next;
}