public async Task ReadStateAsync(string grainType, GrainReference grainReference, IGrainState grainState)
{
EnsureNotClosed();
var meta = grainState.ToGrainMeta(grainReference, grainType, _serviceId);
try
{
var collectionName = Naming.CollectionNameForGrain(grainType, _options.CollectionNamePrefix);
var collection = _database.GetCollection <MongoGrain>(collectionName);
var id = Naming.PrimaryKeyForGrain(_serviceId, grainReference);
LogVerbose3($"Reading data: {meta}", MongoStorageLogCode.TraceReading);
var doc = await collection.Find(x => x.Id == id).FirstOrDefaultAsync();
if (doc == null)
{
LogVerbose3($"Grain state not found. {meta}", MongoStorageLogCode.TraceNotFound);
return;
}
grainState.ETag = doc.Meta.ETag;
grainState.State = doc.Data;
LogVerbose3($"Read data: {meta}", MongoStorageLogCode.TraceRead);
}
catch (Exception ex)
{
LogError($"Error while reading. {meta} Error={ex.Message}", MongoStorageLogCode.ErrorRead, ex);
throw;
}
}
public static MongoGrain ToGrain(this IGrainState grainState, GrainReference reference, string grainType,
Guid serviceId)
{
return(new MongoGrain
{
Id = Naming.PrimaryKeyForGrain(serviceId, reference),
Data = grainState.State,
Meta = grainState.ToGrainMeta(reference, grainType, serviceId)
});
}
public async Task WriteStateAsync(string grainType, GrainReference grainReference, IGrainState grainState)
{
EnsureNotClosed();
var meta = grainState.ToGrainMeta(grainReference, grainType, _serviceId);
try
{
var collectionName = Naming.CollectionNameForGrain(grainType, _options.CollectionNamePrefix);
var collection = _database.GetCollection <MongoGrain>(collectionName);
LogVerbose3($"Writing data: {meta}", MongoStorageLogCode.TraceWriting);
if (string.IsNullOrEmpty(grainState.ETag))
{
var grain = grainState.ToGrain(grainReference, grainType, _serviceId);
grain.Meta.Timestamp = DateTime.UtcNow.Ticks;
await collection.InsertOneAsync(grain);
grainState.ETag = grain.Meta.ETag;
}
else
{
var id = Naming.PrimaryKeyForGrain(_serviceId, grainReference);
// Update data and generate new timestamp
var update = Builders <MongoGrain> .Update
.Set(x => x.Data, grainState.State)
.Set(x => x.Meta.Timestamp, DateTime.UtcNow.Ticks);
var options = new FindOneAndUpdateOptions <MongoGrain>
{
IsUpsert = false,
ReturnDocument = ReturnDocument.After,
Projection = Builders <MongoGrain> .Projection.Include(x => x.Meta)
};
var updatedGrain = await collection.FindOneAndUpdateAsync <MongoGrain>(
x => x.Id == id && x.Meta.Timestamp == meta.Timestamp,
update,
options);
if (updatedGrain == null)
{
var message =
$"Inconsistent state for grain: {meta}. ETag has changed or document has already been deleted.";
throw new InconsistentStateException(message);
}
grainState.ETag = updatedGrain.Meta.ETag;
}
LogVerbose3($"Wrote data: {meta}", MongoStorageLogCode.TraceWrite);
}
catch (Exception ex)
{
LogError($"Error while writing. {meta} Error={ex.Message}", MongoStorageLogCode.ErrorWrite, ex);
throw;
}
}
public async Task ClearStateAsync(string grainType, GrainReference grainReference, IGrainState grainState)
{
EnsureNotClosed();
var meta = grainState.ToGrainMeta(grainReference, grainType, _serviceId);
try
{
var collectionName = Naming.CollectionNameForGrain(grainType, _options.CollectionNamePrefix);
var collection = _database.GetCollection <MongoGrain>(collectionName);
LogVerbose3($"Deleting data: {meta}", MongoStorageLogCode.TraceDeleting);
var id = Naming.PrimaryKeyForGrain(_serviceId, grainReference);
await collection.DeleteOneAsync(x => x.Id == id);
grainState.ETag = null;
LogVerbose3($"Deleted data: {meta}", MongoStorageLogCode.TraceDelete);
}
catch (Exception ex)
{
LogError($"Error while deleting. {meta} Error={ex.Message}", MongoStorageLogCode.ErrorDelete, ex);
throw;
}
}
