private void HandleMessage(CommandBusinessContext businessContext)
{
var message = businessContext.Message.Cmd;
try
{
var call = _cache.GetOrAdd(
key: message.GetType(),
valueFactory: CreateHandleCommand);
call(context, message);
var unEvts = context.TrackedAggregateRoots.SelectMany(p => p.UncommittedEvents);
businessContext.UncommittedEvents = unEvts.ToList();
businessContext.Reply = new ReplyMessage(message.Id)
{
LastEventUTCTimestamp = unEvts?.Select(a => a.UTCTimestamp).LastOrDefault() ?? 0
};
foreach (var root in context.TrackedAggregateRoots)
{
_contextCache.Set(root);
}
}
catch (Exception ex)
{
//加入错误回复消息
//清空上下文，移除缓存
businessContext.Reply = new ReplyMessage(message.Id, ex);
//上下文的聚合根中有事件的则说明被执行过，需要删除进行重建
var clearRoots = context.TrackedAggregateRoots.Where(a => a.UncommittedEvents.Any());
foreach (var root in clearRoots)
{
_contextCache.Remove(root);
}
}
finally
{
context.Clear();
}
}
public override void Handle(CommandMessage[] messages, long endSequence)
{
CommandBusinessContext[] businessContexts = new CommandBusinessContext[messages.Length];
for (int i = 0; i < messages.Length; i++)
{
CommandBusinessContext businessContext = new CommandBusinessContext();
businessContext.Message = messages[i];
businessContexts[i] = businessContext;
HandleMessage(businessContext);
}
//存储事件
//发送消息到消息总线
//通知回复消息
SaveEvent(businessContexts);
SendEvent(businessContexts);
NoticeEvent(businessContexts);
}
