public EventAppendResult AppendEventStreams(IEnumerable <IEventStream> eventStreams)
{
lock (_lockObj)
{
var eventStreamDict = GroupEventStreamByAggregateRoot(eventStreams);
var eventAppendResult = new EventAppendResult();
foreach (var entry in eventStreamDict)
{
var aggregateRootId = entry.Key;
var eventStreamList = entry.Value;
//检查当前聚合根的事件是否合法
if (!CheckAggregateEvents(aggregateRootId, eventStreamList, eventAppendResult, out AggregateLatestVersionData aggregateLatestVersionData))
{
continue;
}
//如果合法，则持久化事件到文件
foreach (var eventStream in eventStreamList)
{
var record = new EventStreamRecord
{
AggregateRootId = eventStream.AggregateRootId,
AggregateRootType = eventStream.AggregateRootType,
Version = eventStream.Version,
CommandId = eventStream.CommandId,
Timestamp = eventStream.Timestamp,
CommandCreateTimestamp = eventStream.CommandCreateTimestamp,
Events = eventStream.Events
};
if (aggregateLatestVersionData != null)
{
record.PreviousRecordLogPosition = aggregateLatestVersionData.LogPosition;
}
//写入事件到文件
_eventDataChunkWriter.Write(record);
//更新聚合根的内存缓存数据
RefreshMemoryCache(aggregateRootId, ref aggregateLatestVersionData, record);
//添加事件到事件队列，以便进行异步持久化事件索引和命令索引
_eventStreamRecordQueue.Enqueue(record);
}
eventAppendResult.SuccessAggregateRootIdList.Add(aggregateRootId);
}
return(eventAppendResult);
}
}
private bool CheckAggregateEvents(string aggregateRootId, IList <IEventStream> eventStreamList, EventAppendResult eventAppendResult, out AggregateLatestVersionData aggregateLatestVersionData)
{
aggregateLatestVersionData = null;
//检查版本号是否连续
if (!IsEventStreamVersionSequential(aggregateRootId, eventStreamList))
{
eventAppendResult.DuplicateEventAggregateRootIdList.Add(aggregateRootId);
return(false);
}
//检查命令是否重复
var duplicatedCommandIdList = CheckDuplicatedCommands(eventStreamList);
if (duplicatedCommandIdList.Count > 0)
{
eventAppendResult.DuplicateCommandAggregateRootIdList.Add(aggregateRootId, duplicatedCommandIdList);
return(false);
}
//检查版本号是否是基于当前聚合根最新的版本号而进行的修改
if (!CheckAggregateRootLatestVersionMatch(aggregateRootId, eventStreamList.First().Version, out aggregateLatestVersionData))
{
eventAppendResult.DuplicateEventAggregateRootIdList.Add(aggregateRootId);
return(false);
}
return(true);
}
