public SnapshotVersion LoadSnapshot()
{
_fileManager.EnsureDirectory(@"~\App_Data");
_fileManager.EnsureDirectory(@"~\App_Data\snapshots");
var files = _fileManager.GetFiles(@"~\App_Data\snapshots");
var lastSnapshot = files.Select(i => GetSnapshotNumber(i)).OrderBy(i => i).LastOrDefault();
var newVersion = new SnapshotVersion();
if (lastSnapshot > SnapshotVersion.NoSnapshot)
{
newVersion = new SnapshotVersion { LastEventId = lastSnapshot };
var serializer = new Newtonsoft.Json.JsonSerializer
{
TypeNameHandling = TypeNameHandling.All,
DefaultValueHandling = DefaultValueHandling.Ignore,
NullValueHandling = NullValueHandling.Ignore
};
var projections = _kernel.GetAll(typeof(IProjection)).OfType<IProjection>().ToDictionary(i => i.Name);
using (var stream = _fileManager.OpenFile(@"~\App_Data\snapshots\snapshot" + lastSnapshot + ".json"))
{
try
{
var dataSet = (IEnumerable<ProjectionData>)serializer.Deserialize(stream, typeof(IEnumerable<ProjectionData>));
if (dataSet != null && dataSet.Count() == projections.Count)
{
foreach (var data in dataSet)
{
projections[data.Name].Data = data;
}
}
else
{
newVersion = new SnapshotVersion();
}
}
catch
{
newVersion = new SnapshotVersion();
}
}
}
return newVersion;
}
public void SaveSnapshot(SnapshotVersion version)
{
var projections = _kernel.GetAll(typeof(IProjection));
var data = projections.AsParallel().OfType<IProjection>().Select(i => i.Data).ToArray();
var serializer = new Newtonsoft.Json.JsonSerializer
{
TypeNameHandling = TypeNameHandling.All,
DefaultValueHandling = DefaultValueHandling.Ignore,
NullValueHandling = NullValueHandling.Ignore
};
using (var stream = _fileManager.CreateFile(@"~\App_Data\snapshots\snapshot" + version.LastEventId + ".json"))
{
serializer.Serialize(stream, data);
}
}
