private IEnumerable <UnwindedDomainEvent> UnwindCommit(ICommit commit)
{
Int32 ordinal = 1;
foreach (var evt in commit.Events)
{
var id = commit.CheckpointToken + "_" + ordinal;
UnwindedDomainEvent unwinded = new UnwindedDomainEvent();
unwinded.Id = id;
unwinded.CheckpointToken = commit.CheckpointToken;
unwinded.EventSequence = ordinal;
unwinded.EventType = evt.Body.GetType().Name;
unwinded.Event = (DomainEvent)evt.Body;
//save all data from commit to the event unwinded to do enhance after load.
var headers = commit.Headers;
if (evt.Headers.Count > 0)
{
headers = commit.Headers.ToDictionary(k => k.Key, k => k.Value);
foreach (var eventHeader in evt.Headers)
{
headers[eventHeader.Key] = eventHeader.Value;
}
}
unwinded.CommitStamp = commit.CommitStamp;
unwinded.CommitId = commit.CommitId;
unwinded.Version = commit.StreamRevision;
unwinded.Context = headers;
yield return(unwinded);
ordinal++;
}
}
private IEnumerable <UnwindedDomainEvent> UnwindChunk(IChunk chunk)
{
Changeset commit = chunk.Payload as Changeset;
if (commit != null)
{
Int32 ordinal = 1;
foreach (var evt in commit.Events)
{
var id = chunk.Position + "_" + ordinal;
UnwindedDomainEvent unwinded = new UnwindedDomainEvent();
unwinded.Id = id;
unwinded.CheckpointToken = chunk.Position;
unwinded.EventSequence = ordinal;
unwinded.EventType = evt.GetType().Name;
unwinded.Event = evt;
//save all data from commit to the event unwinded to do enhance after load.
var headers = commit.Headers;
unwinded.CommitStamp = (evt as DomainEvent)?.CommitStamp ?? DateTime.MinValue;
unwinded.CommitId = chunk.OperationId;
unwinded.Version = commit.AggregateVersion;
unwinded.PartitionId = chunk.PartitionId;
var newContext = new Dictionary <String, Object>();
foreach (var key in headers.Keys.Where(k => !HeaderToRemove.Contains(k)))
{
newContext[key] = headers[key];
}
unwinded.Context = newContext;
yield return(unwinded);
ordinal++;
}
}
else if (chunk.Payload != null)
{
var id = chunk.Position + "_1";
UnwindedDomainEvent unwinded = new UnwindedDomainEvent();
unwinded.Id = id;
unwinded.CheckpointToken = chunk.Position;
unwinded.EventSequence = 1;
unwinded.EventType = chunk.Payload.GetType().Name;
unwinded.Event = chunk.Payload;
//save all data from commit to the event unwinded to do enhance after load.
unwinded.CommitStamp = DateTime.MinValue;
unwinded.CommitId = chunk.OperationId;
unwinded.Version = 0;
unwinded.PartitionId = chunk.PartitionId;
unwinded.Context = new Dictionary <String, Object>();
yield return(unwinded);
}
}
internal async Task DispatchEventAsync(UnwindedDomainEvent unwindedEvent)
{
if (unwindedEvent == UnwindedDomainEvent.LastEvent)
{
Finished = true;
_lastCheckpointRebuilded = LastCheckpointDispatched; //Set to zero metrics, we dispatched everything.
return;
}
var chkpoint = unwindedEvent.CheckpointToken;
if (chkpoint > LastCheckpointDispatched)
{
if (_logger.IsDebugEnabled)
{
_logger.DebugFormat("Discharded event {0} commit {1} because last checkpoint dispatched for slot {2} is {3}.", unwindedEvent.CommitId, unwindedEvent.CheckpointToken, SlotName, _maxCheckpointDispatched);
}
return;
}
Interlocked.Increment(ref RebuildProjectionMetrics.CountOfConcurrentDispatchingCommit);
TenantContext.Enter(_config.TenantId);
try
{
string eventName = unwindedEvent.EventType;
foreach (var projection in _projections)
{
var cname = projection.Info.CommonName;
long elapsedticks;
try
{
QueryPerformanceCounter(out long ticks1);
await projection.HandleAsync(unwindedEvent.GetEvent(), true).ConfigureAwait(false);
QueryPerformanceCounter(out long ticks2);
elapsedticks = ticks2 - ticks1;
KernelMetricsHelper.IncrementProjectionCounterRebuild(cname, SlotName, eventName, elapsedticks);
}
catch (Exception ex)
{
_logger.FatalFormat(ex, "[Slot: {3} Projection: {4}] Failed checkpoint: {0} StreamId: {1} Event Name: {2}",
unwindedEvent.CheckpointToken,
unwindedEvent.PartitionId,
eventName,
SlotName,
cname
);
HealthChecks.RegisterHealthCheck($"RebuildDispatcher, slot {SlotName} - FailedCheckpoint {unwindedEvent.CheckpointToken}", () =>
HealthCheckResult.Unhealthy(ex)
);
throw;
}
_metrics.Inc(cname, eventName, elapsedticks);
if (_logger.IsDebugEnabled)
{
_logger.DebugFormat("[{3}] [{4}] Handled checkpoint {0}: {1} > {2}",
unwindedEvent.CheckpointToken,
unwindedEvent.PartitionId,
eventName,
SlotName,
cname
);
}
}
}
catch (Exception ex)
{
_logger.ErrorFormat(ex, "Error dispathing commit id: {0}\nMessage: {1}\nError: {2}",
unwindedEvent.CheckpointToken, unwindedEvent.Event, ex.Message);
HealthChecks.RegisterHealthCheck($"RebuildDispatcher, slot {SlotName} - GeneralError", () =>
HealthCheckResult.Unhealthy(ex)
);
throw;
}
_lastCheckpointRebuilded = chkpoint;
KernelMetricsHelper.MarkEventInRebuildDispatchedCount(SlotName, 1);
Interlocked.Decrement(ref RebuildProjectionMetrics.CountOfConcurrentDispatchingCommit);
}