private void ParseMiddlewares(IMessagePipeline pipeline, XmlNodeList nodes)
{
foreach (XmlNode node in nodes)
{
var parameters = new Dictionary <string, string>();
if (node.NodeType != XmlNodeType.Element)
{
continue;
}
if (node.Attributes == null)
{
throw new MessagesConfigurationException("Middleware tag does not have attributes.");
}
foreach (XmlAttribute attr in node.Attributes)
{
parameters.Add(attr.Name, attr.Value);
}
var typeName = node.Attributes["type"].Value;
if (string.IsNullOrWhiteSpace(typeName))
{
throw new MessagesConfigurationException("Middleware tag does not have \"type\" attribute.");
}
var type = Type.GetType(typeName);
if (type == null)
{
throw new MessagesConfigurationException($"Cannot load type {typeName}.");
}
var ctor = type.GetConstructors().FirstOrDefault(c => c.GetParameters().Length == 1 &&
c.GetParameters()[0].ParameterType == typeof(IDictionary <string, string>));
if (ctor == null)
{
ctor = type.GetConstructors().FirstOrDefault(c => c.GetParameters().Length == 0);
}
if (ctor == null)
{
var msg = "Cannot find public parameterless constructor or constructor that accepts IDictionary<string, string>.";
throw new MessagesConfigurationException(msg);
}
var middleware = ctor.GetParameters().Length == 1
? ctor.Invoke(new object[] { parameters }) as IMessagePipelineMiddleware
: ctor.Invoke(new object[] { }) as IMessagePipelineMiddleware;
if (middleware == null)
{
throw new MessagesConfigurationException($"Cannot instaniate pipeline middleware {type.Name}.");
}
SetIdProperty(middleware, node);
pipeline.AddMiddlewares(middleware);
}
}
