/// <summary>
/// 通过字段的匹配，找到对应的MessageDescription
/// </summary>
/// <param name="recipient"></param>
/// <param name="fields"></param>
/// <returns></returns>
protected virtual MessageDescription GetMessageDescription(MessageReceivingEndpoint recipient, IDictionary <string, string> fields)
{
var matches = this.requestMessageTypes.Keys
.Where(message => message.CheckMessagePartsPassBasicValidation(fields))
.OrderByDescending(message => CountInCommon(message.Mapping.Keys, fields.Keys))
.ThenByDescending(message => message.Mapping.Count)
.CacheGeneratedResults();
var match = matches.FirstOrDefault();
if (match != null)
{
if (Logger.Messaging.IsWarnEnabled() && matches.Count() > 1)
{
Logger.Messaging.WarnFormat(
"Multiple message types seemed to fit the incoming data: {0}",
matches.ToStringDeferred());
}
return(match);
}
else
{
return(null);
}
}
/// <summary>
/// 转换为IDirectedProtocolMessage
/// </summary>
/// <param name="recipient"></param>
/// <param name="fields"></param>
/// <returns></returns>
public virtual IDirectedProtocolMessage GetNewRequestMessage(MessageReceivingEndpoint recipient, IDictionary <string, string> fields)
{
MessageDescription matchingType = this.GetMessageDescription(recipient, fields);
if (matchingType != null)
{
return(this.InstantiateAsRequest(matchingType, recipient));
}
else
{
return(null);
}
}
protected virtual IProtocolMessage Receive(Dictionary <string, string> fields, MessageReceivingEndpoint recipient)
{
this.FilterReceivedFields(fields);
IProtocolMessage message = this.MessageFactory.GetNewRequestMessage(recipient, fields); // 创建对象实例
if (message == null)
{
return(null);
}
var directedMessage = message as IDirectedProtocolMessage;
ErrorUtilities.VerifyProtocol(recipient == null || (directedMessage != null && (recipient.AllowedMethods & directedMessage.HttpMethods) != 0), MessagingStrings.UnsupportedHttpVerbForMessageType, message.GetType().Name, recipient.AllowedMethods);
var messageAccessor = this.MessageDescriptions.GetAccessor(message); // 简单获取MessageDictionary
messageAccessor.Deserialize(fields); // 给对象填充参数值
return(message);
}
/// <summary>
/// 创建对应的实例
/// </summary>
/// <param name="messageDescripton"></param>
/// <param name="recipient"></param>
/// <returns></returns>
protected virtual IDirectedProtocolMessage InstantiateAsRequest(MessageDescription messageDescripton, MessageReceivingEndpoint recipient)
{
ConstructorInfo ctor = this.requestMessageTypes[messageDescripton];
return((IDirectedProtocolMessage)ctor.Invoke(new object[] { recipient.Location, messageDescripton.MessageVersion }));
}
