public async Task SaveAsync(Type projectionType, IEvent @event, EventOrigin eventOrigin)
{
if (ReferenceEquals(null, projectionType))
{
throw new ArgumentNullException(nameof(projectionType));
}
if (ReferenceEquals(null, @event))
{
throw new ArgumentNullException(nameof(@event));
}
if (ReferenceEquals(null, eventOrigin))
{
throw new ArgumentNullException(nameof(eventOrigin));
}
string projectionName = projectionType.GetContractId();
var handlerInstance = handlerFactory.Create(projectionType);
var projection = handlerInstance.Current as IProjectionDefinition;
if (projection != null)
{
var projectionIds = projection.GetProjectionIds(@event);
foreach (var projectionId in projectionIds)
{
using (log.BeginScope(s => s.AddScope("cronus_projection_id", projectionId)))
{
ReadResult <ProjectionVersions> result = await GetProjectionVersionsAsync(projectionName).ConfigureAwait(false);
if (result.IsSuccess)
{
foreach (ProjectionVersion version in result.Data)
{
using (log.BeginScope(s => s.AddScope("cronus_projection_version", version)))
{
if (ShouldSaveEventForVersion(version))
{
try
{
SnapshotMeta snapshotMeta = null;
if (projectionType.IsSnapshotable())
{
snapshotMeta = await snapshotStore.LoadMetaAsync(projectionName, projectionId, version).ConfigureAwait(false);
}
else
{
snapshotMeta = new NoSnapshot(projectionId, projectionName).GetMeta();
}
int snapshotMarker = snapshotMeta.Revision + 2;
var commit = new ProjectionCommit(projectionId, version, @event, snapshotMarker, eventOrigin, DateTime.UtcNow);
await projectionStore.SaveAsync(commit).ConfigureAwait(false);
}
catch (Exception ex) when(LogMessageWhenFailToUpdateProjection(ex, version))
{
}
}
}
}
if (result.HasError)
{
log.Error(() => "Failed to update projection because the projection version failed to load. Please replay the projection to restore the state. Self-heal hint!" + Environment.NewLine + result.Error + Environment.NewLine + $"\tProjectionName:{projectionName}" + Environment.NewLine + $"\tEvent:{@event}");
}
}
}
}
}
}