public static WorkTime Combine(WorkTime w1, WorkTime w2)
{
if (w1.AggregateId != w2.AggregateId)
{
throw new Exception("Invalid aggregate id");
}
if (w1.AggregateVersion == w2.AggregateVersion)
{
return(w1);
}
WorkTime v1 = w1.AggregateVersion > w2.AggregateVersion ? w2 : w1;
WorkTime v2 = w1.AggregateVersion > w2.AggregateVersion ? w1 : w2;
foreach (var ev in v2.PendingEvents)
{
if (ev.AggregateVersion > v1.AggregateVersion)
{
v1.AsDynamic().Apply(ev);
v1.AddEvent(ev);
}
}
return(v1);
}
public static WorkTime FromEvents(IEnumerable <Event> events)
{
var workTime = new WorkTime();
Event?last = null;
foreach (var ev in events)
{
if (last == null)
{
if (ev.AggregateVersion != 1)
{
throw new Exception(
$"Cannot create aggregate starting from event version {ev.AggregateVersion}");
}
workTime.AggregateId = ev.AggregateId;
}
workTime.AsDynamic().Apply(ev);
last = ev;
}
if (last == null)
{
throw new Exception("empty event list");
}
workTime.AggregateVersion = last.AggregateVersion;
return(workTime);
}