public async Task SaveSnapshotAsync(IAggregateRoot aggregateRoot, Type aggregateRootType, int publishedVersion)
{
if (aggregateRoot == null)
{
throw new ArgumentNullException(nameof(aggregateRoot));
}
if (publishedVersion % _aggregateSnapshotConfiguration.VersionInterval != 0)
{
return;
}
var copiedAggregateRoot = DeepCopier.Copy(aggregateRoot);
var aggregateRootJson = _aggregateSnapshotSerializer.Serialize(copiedAggregateRoot);
var aggregateRootTypeName = _typeNameProvider.GetTypeName(aggregateRootType);
var snapshot = new Snapshot()
{
CreationTime = DateTime.UtcNow,
ModificationTime = DateTime.UtcNow,
AggregateRootId = copiedAggregateRoot.UniqueId,
AggregateRootTypeName = aggregateRootTypeName,
Version = copiedAggregateRoot.Version,
SerializedPayload = aggregateRootJson,
};
var sql = string.Format(InsertOrUpdateSnapshotSql, _snapshotRepository.GetTableName(snapshot.AggregateRootId));
using (var connection = _snapshotRepository.GetConnection())
{
await connection.ExecuteAsync(sql, snapshot);
}
}
public async Task CreateOrUpdateSnapshotPayloadAsync(string aggregateRootId, string aggregateRootTypeName, int publishedVersion, string payload)
{
var snapshot = new Snapshot()
{
CreationTime = DateTime.UtcNow,
ModificationTime = DateTime.UtcNow,
AggregateRootId = aggregateRootId,
AggregateRootTypeName = aggregateRootTypeName,
Version = publishedVersion,
SerializedPayload = payload,
};
var sql = string.Format(InsertOrUpdateSnapshotSql, _snapshotRepository.GetTableName(snapshot.AggregateRootId));
using (var connection = _snapshotRepository.GetConnection())
{
await connection.OpenAsync();
await connection.ExecuteAsync(sql, snapshot);
}
}
public async Task <IAggregateRoot> RestoreFromSnapshotAsync(Type aggregateRootType, string aggregateRootId)
{
var snapshot = default(Snapshot);
using (var connection = _snapshotRepository.GetConnection())
{
var result = await connection.QueryListAsync <Snapshot>(new { AggregateRootId = aggregateRootId }, _snapshotRepository.GetTableName(aggregateRootId));
snapshot = result.SingleOrDefault();
}
if (snapshot == null)
{
return(null);
}
return(_aggregateSnapshotSerializer.Deserialize(snapshot.SerializedPayload, aggregateRootType) as IAggregateRoot);
}