/// <summary>
/// Saves the provided <paramref name="snapshot"/> into storage.
/// </summary>
/// <param name="snapshot">the <see cref="Snapshot"/> to save and store.</param>
public override void Save(Snapshot snapshot)
{
Logger.LogDebug("Persisting aggregate root snapshot", string.Format("{0}\\Save", GetType().Name));
try
{
using (DocumentClient client = AzureDocumentDbSnapshotStoreConnectionStringFactory.GetSnapshotStoreConnectionClient())
{
Database database = AzureDocumentDbHelper.CreateOrReadDatabase(client, AzureDocumentDbSnapshotStoreConnectionStringFactory.GetSnapshotStoreConnectionDatabaseName()).Result;
string collectionName = AzureDocumentDbSnapshotStoreConnectionStringFactory.GetSnapshotStoreConnectionCollectionName();
DocumentCollection collection = AzureDocumentDbHelper.CreateOrReadCollection(client, database, collectionName, UniqueIndexProperties).Result;
Logger.LogDebug("Creating document for snapshot asynchronously", string.Format("{0}\\Save", GetType().Name));
AzureDocumentDbHelper.ExecuteFaultTollerantFunction
(
() =>
{
Task <ResourceResponse <Document> > work = client.CreateDocumentAsync
(
collection.SelfLink,
BuildEventData(snapshot)
);
work.ConfigureAwait(false);
work.Wait();
}
);
}
}
finally
{
Logger.LogDebug("Persisting aggregate root snapshot... Done", string.Format("{0}\\Save", GetType().Name));
}
}
/// <summary>
/// Get the latest <see cref="Snapshot"/> from storage.
/// </summary>
/// <returns>The most recent <see cref="Snapshot"/> of</returns>
protected virtual async Task <Snapshot> GetAsync(Type aggregateRootType, string streamName)
{
using (DocumentClient client = AzureDocumentDbSnapshotStoreConnectionStringFactory.GetSnapshotStoreConnectionClient())
{
Database database = AzureDocumentDbHelper.CreateOrReadDatabase(client, AzureDocumentDbSnapshotStoreConnectionStringFactory.GetSnapshotStoreConnectionDatabaseName()).Result;
string collectionName = AzureDocumentDbSnapshotStoreConnectionStringFactory.GetSnapshotStoreConnectionCollectionName();
DocumentCollection collection = AzureDocumentDbHelper.CreateOrReadCollection(client, database, collectionName, UniqueIndexProperties).Result;
IOrderedQueryable <EventData> query = client.CreateDocumentQuery <EventData>(collection.SelfLink);
IEnumerable <EventData> results = query.Where(snapshot => snapshot.AggregateId == streamName);
return(AzureDocumentDbHelper.ExecuteFaultTollerantFunction(() =>
results
.ToList()
.OrderByDescending(eventData => eventData.Version)
.Take(1)
.Select(EventDeserialiser.Deserialise)
.SingleOrDefault()
));
}
}
