public async Task <Dictionary <string, TState> > Dispatch <TProjection, TState>(string streamId) where TProjection : ProjectionBase <TProjection, TState>, new() where TState : new()
{
Dictionary <string, TState> result;
long version;
if (SnapshotProjection <TState> .TryGetSnapshot(streamId, out var snapshot))
{
result = snapshot.State;
version = snapshot.Version;
}
else
{
result = new Dictionary <string, TState>();
version = 0;
}
var actualVersion = await Dispatch <TProjection, TState>(streamId, version, result).ConfigureAwait(false);
if (actualVersion > version && actualVersion > _configuration.SnapchotLimit)
{
SnapshotProjection <TState> .AddSnapshot(streamId, new SnapshotProjection <Dictionary <string, TState> >(result, actualVersion));
}
return(result);
}
public static void AddSnapshot(string key, SnapshotProjection <Dictionary <string, TState> > snapshot) => _snapshotDictionary.AddOrUpdate(key, snapshot, (_, __) => snapshot);
public static bool TryGetSnapshot(string key, out SnapshotProjection <Dictionary <string, TState> > snapshot) => _snapshotDictionary.TryGetValue(key, out snapshot);