public static WebRequestFactory GetInstance <T>() where T : WebRequestFactory
{
WebRequestFactory instance;
try
{
instance = DoGetInstance(typeof(T));
}
catch (Exception e)
{
Logger.GetInstance(typeof(WebRequestFactory)).Fatal("Instance initialization error: " + e);
Logger.GetInstance(typeof(WebRequestFactory)).Info("Initializing " + typeof(DefaultWebRequestFactory).FullName + "...");
instance = new DefaultWebRequestFactory();
}
return(instance);
}
private static WebRequestFactory DoGetInstance(Type type)
{
if (type == null)
{
throw new ArgumentException("Invalid arguments to get " + typeof(WebRequestFactory).Name + " instance");
}
var key = type.FullName + "_";
WebRequestFactory instance = null;
if (Instances.ContainsKey(key))
{
instance = Instances[key];
}
if (instance == null)
{
Logger.GetInstance(typeof(WebRequestFactory)).Info("Initializing " + key + "...");
var constructor = type.GetConstructor(new Type[] { });
if (constructor != null)
{
instance = (WebRequestFactory)constructor.Invoke(new object[] { });
}
}
if (instance == null)
{
Logger.GetInstance(typeof(WebRequestFactory)).Info("Initializing " + typeof(DefaultWebRequestFactory).FullName + "...");
instance = new DefaultWebRequestFactory();
}
lock (InstancesLock)
{
if (!Instances.ContainsKey(key))
{
Instances.Add(key, instance);
}
}
return(instance);
}