void DispatchCommit(ICommit commit, string slotName, Int64 startCheckpoint)
{
Interlocked.Increment(ref _countOfConcurrentDispatchingCommit);
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["commit"] = commit.CommitId;
}
if (Logger.IsDebugEnabled)
{
Logger.DebugFormat("Dispatching checkpoit {0} on tenant {1}", commit.CheckpointToken, _config.TenantId);
}
TenantContext.Enter(_config.TenantId);
var chkpoint = commit.CheckpointToken;
if (!lastCheckpointDispatched.ContainsKey(slotName))
{
lastCheckpointDispatched[slotName] = 0;
}
if (lastCheckpointDispatched[slotName] >= chkpoint)
{
var error = String.Format("Sequence broken, last checkpoint for slot {0} was {1} and now we dispatched {2}",
slotName, lastCheckpointDispatched[slotName], chkpoint);
Logger.Error(error);
throw new ApplicationException(error);
}
if (lastCheckpointDispatched[slotName] + 1 != chkpoint)
{
if (lastCheckpointDispatched[slotName] > 0)
{
Logger.DebugFormat("Sequence of commit non consecutive, last dispatched {0} receiving {1}",
lastCheckpointDispatched[slotName], chkpoint);
}
}
lastCheckpointDispatched[slotName] = chkpoint;
if (chkpoint <= startCheckpoint)
{
//Already dispatched, skip it.
Interlocked.Decrement(ref _countOfConcurrentDispatchingCommit);
return;
}
var projections = _projectionsBySlot[slotName];
bool dispatchCommit = false;
var eventCount = commit.Events.Count;
var projectionToUpdate = new List <string>();
for (int index = 0; index < eventCount; index++)
{
var eventMessage = commit.Events.ElementAt(index);
try
{
var evt = (DomainEvent)eventMessage.Body;
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["evType"] = evt.GetType().Name;
}
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["evMsId"] = evt.MessageId;
}
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["evCheckpointToken"] = commit.CheckpointToken;
}
string eventName = evt.GetType().Name;
foreach (var projection in projections)
{
var cname = projection.GetCommonName();
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["prj"] = cname;
}
var checkpointStatus = _checkpointTracker.GetCheckpointStatus(cname, commit.CheckpointToken);
bool handled;
long ticks = 0;
try
{
//pay attention, stopwatch consumes time.
var sw = new Stopwatch();
sw.Start();
handled = projection.Handle(evt, checkpointStatus.IsRebuilding);
sw.Stop();
ticks = sw.ElapsedTicks;
MetricsHelper.IncrementProjectionCounter(cname, slotName, eventName, ticks);
}
catch (Exception ex)
{
var error = String.Format("[Slot: {3} Projection: {4}] Failed checkpoint: {0} StreamId: {1} Event Name: {2}",
commit.CheckpointToken,
commit.StreamId,
eventName,
slotName,
cname);
Logger.Fatal(error, ex);
_engineFatalErrors.Add(error);
throw;
}
if (handled)
{
_metrics.Inc(cname, eventName, ticks);
if (Logger.IsDebugEnabled)
{
Logger.DebugFormat("[{3}] [{4}] Handled checkpoint {0}: {1} > {2}",
commit.CheckpointToken,
commit.StreamId,
eventName,
slotName,
cname
);
}
}
if (!checkpointStatus.IsRebuilding)
{
if (handled)
{
dispatchCommit = true;
}
projectionToUpdate.Add(cname);
}
else
{
if (checkpointStatus.IsLast && (index == eventCount - 1))
{
projection.StopRebuild();
var meter = _metrics.GetMeter(cname);
_checkpointTracker.RebuildEnded(projection, meter);
Logger.InfoFormat("Rebuild done {0} @ {1}",
projection.GetType().FullName,
commit.CheckpointToken
);
}
}
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["prj"] = null;
}
}
ClearLoggerThreadPropertiesForEventDispatchLoop();
}
catch (Exception ex)
{
Logger.ErrorFormat(ex, "Error dispathing commit id: {0}\nMessage: {1}\nError: {2}",
commit.CheckpointToken, eventMessage.Body, ex.Message);
ClearLoggerThreadPropertiesForEventDispatchLoop();
throw;
}
}
if (projectionToUpdate.Count == 0)
{
//I'm in rebuilding or no projection had run any events, only update slot
_checkpointTracker.UpdateSlot(slotName, commit.CheckpointToken);
}
else
{
//I'm not on rebuilding, we have projection to update, update everything with one call.
_checkpointTracker.UpdateSlotAndSetCheckpoint(slotName, projectionToUpdate, commit.CheckpointToken);
}
MetricsHelper.MarkCommitDispatchedCount(slotName, 1);
if (dispatchCommit)
{
_notifyCommitHandled.SetDispatched(commit);
}
// ok in multithread wihout locks!
if (_maxDispatchedCheckpoint < chkpoint)
{
if (Logger.IsDebugEnabled)
{
Logger.DebugFormat("Updating last dispatched checkpoint from {0} to {1}",
_maxDispatchedCheckpoint,
chkpoint
);
}
_maxDispatchedCheckpoint = chkpoint;
}
if (Logger.IsDebugEnabled)
{
Logger.ThreadProperties["commit"] = null;
}
Interlocked.Decrement(ref _countOfConcurrentDispatchingCommit);
}
