/// <summary>
/// 移除超过24小时已完成的事件锁、事件监视器、队列信息
/// 我们不能在执行完领域事件后立即删除这些信息，因为有可能是外界调用本地的事件，稍后可能外界要求回逆事件
/// 因此我们只删除24小时过期的信息，因为外界不可能过了24小时后又要求回逆
/// </summary>
/// <param name="minutes"></param>
private static void Clear()
{
DataContext.NewScope(() =>
{
var repository = Repository.Create <IEventLockRepository>();
var locks = repository.FindExpireds(24);
foreach (var @lock in locks)
{
var queueId = @lock.Id;
var queue = EventQueue.Find(queueId);
if (!queue.IsSucceeded)
{
continue; //对于没有执行成功的队列，我们不删除日志等信息，这样管理员可以排查错误
}
DataContext.NewScope(() =>
{
var monitor = EventMonitor.Find(queueId);
if (!monitor.IsEmpty())
{
EventMonitor.Delete(monitor);
}
EventQueue.Delete(queueId);
EventLogEntry.Deletes(queueId); //删除日志的所有条目
EventLog.Delete(queueId);
}, true);
EventLock.Delete(@lock);
}
}, true);
}
/// <summary>
/// 根据写入的日志执行恢复操作
/// </summary>
/// <param name="logId"></param>
/// <param name="process"></param>
internal static void Restore(Guid logId, Action <EventLog, EventLogEntry> process)
{
DataContext.NewScope(() =>
{
var log = GetLog(logId);
if (log.IsEmpty() || log.Status == EventLogStatus.Reversed)
{
return; //表示已经回逆了
}
AppSession.Identity = log.GetIdentity(); //初始化会话身份
var repository = Repository.Create <IEventLogEntryRepository>();
var entries = repository.FindByReverseOrder(logId);
foreach (var entry in entries)
{
if (entry.IsReversed)
{
continue;
}
//为日志条目的回逆创建独立的事务
DataContext.NewScope(() =>
{
process(log, entry);
entry.IsReversed = true;
EventLogEntry.Update(entry);
}, true);
}
log.Status = EventLogStatus.Reversed;
UpdateLog(log);
}, true);
}
private static void Write(EventLog log, EventOperation operation, DTObject content)
{
//写入日志条目
var index = log.EntryCount;
var contentCode = content.IsEmpty() ? "{}" : content.GetCode();
var entry = new EventLogEntry(log, operation, contentCode, index);
var repository = Repository.Create <IEventLogEntryRepository>();
repository.Add(entry);
log.EntryCount++;
UpdateLog(log);
}