[英]QuickFix/N how best to deal with multiple FIX versions
I connect to several APIs that all use FXI4.2 but now I wish to connect to another that uses its own version of FIX4.4. 我连接到几个全部使用FXI4.2的API但现在我希望连接到使用其自己版本的FIX4.4的另一个。
I have an router app that send orders to the various APIs and it would appear that I need to duplicate all my methods (eg the OnMessage(), NewSingleOrder etc) to cope with the 2 FIX protocols. 我有一个路由器应用程序,发送订单到各种API,似乎我需要复制我的所有方法(例如OnMessage(),NewSingleOrder等),以应对2 FIX协议。
Is there a smarter way to do this to avoid this duplication? 有没有更聪明的方法来避免这种重复?
Moderators: I know this is a little open now, but I will add some code snippets once I get some initial feedback. 主持人:我知道现在有点开放,但是一旦得到一些初步反馈,我会添加一些代码片段。
public void OnMessage(QuickFix.FIX42.MarketDataIncrementalRefresh message, SessionID sessionID)
{
int count = message.NoMDEntries.getValue();
QuickFix.FIX42.MarketDataSnapshotFullRefresh.NoMDEntriesGroup repeatingMDItem = new QuickFix.FIX42.MarketDataSnapshotFullRefresh.NoMDEntriesGroup();
DateTime sourceDT = DateTime.ParseExact(message.Header.GetField(52), "yyyyMMdd-HH:mm:ss.fff", ci);
DateTime dt = TimeZoneInfo.ConvertTimeToUtc(sourceDT, utcZone);
DateTime nowUTC = TimeZoneInfo.ConvertTime(DateTime.UtcNow, utcZone, utcZone);
TimeSpan diffToUK = nowUTC - dt;
for (int i = 1; i <= count; i++)
{
message.GetGroup(i, repeatingMDItem);
String symbol = repeatingMDItem.GetField(55);
int tickBandNoDecPlaces = int.Parse(repeatingMDItem.GetField(5071));
masterForm.MDATA.AddData(symbol, tickBandNoDecPlaces, sourceDT);
}
}
Question: Will FIX44 accept all previous FIX? 问题:FIX44会接受所有之前的FIX吗?
How can I make this agnostic about which FIX version? 如何使这个不可知的FIX版本?
public void OnMessage(QuickFix.FIX42.MarketDataSnapshotFullRefresh message, SessionID sessionID)
{
OnMessageAgnostic(message, sessionID);
}
public void OnMessage(QuickFix.FIX44.MarketDataSnapshotFullRefresh message, SessionID sessionID)
{
OnMessageAgnostic(message, sessionID);
}
public int FixVersion(QuickFix.Message message)
{
switch (message.GetString(8)) // BeginString
{
case Values.BeginString_FIX42:
return 42;
case Values.BeginString_FIX44:
return 44;
default:
throw new NotSupportedException("This version of FIX is unsupported");
}
}
public void OnMessageAgnostic(QuickFix.Message message, SessionID sessionID)
{
int count;
if (FixVersion(message)==44)
{
count = ((QuickFix.FIX44.MarketDataSnapshotFullRefresh)message).NoMDEntries.getValue();
}
}
The problem is that is that FIX message types from different versions don't have any relationship except for their base class - at the lowest level, all FIX messages derive from Message
. 问题是来自不同版本的FIX消息类型除了它们的基类之外没有任何关系 - 在最低级别,所有FIX消息都派生自
Message
。 You need to take the information you need from a message, package it in such a way that it's version-agnostic (as far as is possible), and then write code against those version-agnostic data structures. 您需要从消息中获取所需的信息,将其打包以使其与版本无关(尽可能),然后针对那些与版本无关的数据结构编写代码。
I suggest that you let the message cracker do the initial filtering for you, if you're OK to let it handle that, and then feed the message to a handler that can deal with that particular type of message: 我建议您让消息破解者为您进行初始过滤,如果您可以让它处理它,然后将消息提供给处理该特定类型消息的处理程序:
public void OnMessage(QuickFix.FIX42.MarketDataIncrementalRefresh message, SessionID sessionID)
{
this.marketDataIncrementalRefreshHandler.Handle(message);
}
public void OnMessage(QuickFix.FIX44.MarketDataIncrementalRefresh message, SessionID sessionID)
{
this.marketDataIncrementalRefreshHandler.Handle(message);
}
... elsewhere ...
public interface FixMessageHandler
{
void Handle(Message msg);
}
public class MarketDataIncrementalRefreshHandler : FixMessageHandler
{
public void Handle(Message msg)
{
DateTime sourceDT = DateTime.ParseExact(message.Header.GetField(52), "yyyyMMdd-HH:mm:ss.fff", ci);
DateTime dt = TimeZoneInfo.ConvertTimeToUtc(sourceDT, utcZone);
DateTime nowUTC = TimeZoneInfo.ConvertTime(DateTime.UtcNow, utcZone, utcZone);
TimeSpan diffToUK = nowUTC - dt;
var noMDEntriesGroups = this.GetAllNoMDEntries(msg)
foreach (var noMDEntriesGroup in noMDEntriesGroups)
{
masterForm.MDATA.AddData(
noMDEntriesGroup.Symbol,
noMDEntriesGroup.TickBandNoDecPlaces,
sourceDT);
}
}
private IEnumerable<NoMDEntriesGroup> GetAllNoMDEntries(Message msg)
{
switch (message.GetString(8)) // BeginString
{
case Values.BeginString_FIX42:
return this.GetAllNoMDEntries((QuickFix.FIX42.MarketDataSnapshotFullRefresh)msg);
case Values.BeginString_FIX44:
return this.GetAllNoMDEntries((QuickFix.FIX44.MarketDataSnapshotFullRefresh)msg);
default:
throw new NotSupportedException("This version of FIX is unsupported");
}
}
private IEnumerable<NoMDEntriesGroup> GetAllNoMDEntries(QuickFix.FIX42.MarketDataSnapshotFullRefresh msg)
{
int count = message.NoMDEntries.getValue();
QuickFix.FIX42.MarketDataSnapshotFullRefresh.NoMDEntriesGroup repeatingMDItem = new QuickFix.FIX42.MarketDataSnapshotFullRefresh.NoMDEntriesGroup();
for (int i = 1; i <= count; i++)
{
message.GetGroup(i, repeatingMDItem);
yield return new NoMDEntriesGroup
{
Symbol = repeatingMDItem.GetField(55),
TickBandNoDecPlaces = int.Parse(repeatingMDItem.GetField(5071)
};
}
}
private IEnumerable<NoMDEntriesGroup> GetAllNoMDEntries(QuickFix.FIX44.MarketDataSnapshotFullRefresh msg)
{
// Should be practically identical to the above version, with 4.4 subbed for 4.2
}
private class NoMDEntriesGroup
{
public string Symbol { get; set; }
public int TickBandNoDecPlaces { get; set; }
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.