/// <summary>
/// 事件重演时，验证某个给定的事件是否有效
/// </summary>
private void VerifySourcableEvent(long currentVersion, SourcableEvent sourcableEvent)
{
if (sourcableEvent.Version <= DefaultVersion)
{
throw new EventSourcingException(string.Format("事件的版本号无效，必须大于等于{0}", DefaultVersion + 1));
}
if (currentVersion == DefaultVersion)
{
if (sourcableEvent.Version != DefaultVersion + 1)
{
throw new EventSourcingException(string.Format("应用到聚合根上的第一个事件的版本必须为{0}.", DefaultVersion + 1));
}
}
else
{
if (sourcableEvent.AggregateRootId != _uniqueId)
{
var message = string.Format("不允许将其他聚合根（aggregateRootId:{0}）的事件（详细信息:{1}）应用到当前聚合根（aggregateRootId:{2}）.",
sourcableEvent.AggregateRootId, sourcableEvent.ToString(), _uniqueId);
throw new EventSourcingException(message);
}
if (sourcableEvent.Version != currentVersion + 1)
{
var message = string.Format("不允许将版本为{0}事件应用到聚合根（aggregateRootId:{1}）. 因为该聚合根的当前版本是{2}, 只有版本为{3}的事件才可以被应用到该聚合根.",
sourcableEvent.Version, _uniqueId, currentVersion, currentVersion + 1);
throw new EventSourcingException(message);
}
}
}
/// <summary>
/// 追加一个新的溯源事件到队列
/// </summary>
private void AppendSourcableEvent(SourcableEvent sourcableEvent)
{
if (_sourcableEvents == null)
{
_sourcableEvents = new Queue <SourcableEvent>();
}
_sourcableEvents.Enqueue(sourcableEvent);
}
