internal static void SaveStateCore(ISubscription subscription, IOperatorStateWriterFactory factory)
{
if (factory == null)
{
throw new ArgumentNullException(nameof(factory));
}
subscription.Accept(new SaveStateVisitor(factory));
}
/// <summary>
/// Saves the state of operators in the <paramref name="subscription"/> to state writers obtained by the specified state writer factory.
/// </summary>
/// <param name="subscription">The subscription to save state for.</param>
/// <param name="factory">State writer factory to obtain state writers for operators from.</param>
public static void SaveState(ISubscription subscription, IOperatorStateWriterFactory factory)
{
if (subscription == null)
{
throw new ArgumentNullException(nameof(subscription));
}
SaveStateCore(subscription, factory);
}
public OperatorStateWriter(IOperatorStateWriterFactory factory, ISerializer serializer, Stream stream)
{
Debug.Assert(factory != null);
Debug.Assert(serializer != null);
Debug.Assert(stream != null);
_factory = factory;
_serializer = serializer;
_stream = stream;
_stream.Write(s_zeroLength, 0, s_zeroLength.Length);
_begin = _stream.Position;
}
/// <summary>
/// Saves the state of the specified stateful operator using a writer obtained from the specified state writer factory.
/// </summary>
/// <param name="factory">Factory to create an operator state writer to write operator state to.</param>
/// <param name="node">Operator whose state to write.</param>
public static void SaveState(this IOperatorStateWriterFactory factory, IStatefulOperator node)
{
using var writer = factory.Create(node);
SaveState(writer, node);
}
/// <summary> /// Saves the state of operators in the subscription to state writers obtained by the specified state writer factory. /// </summary> /// <param name="factory">State writer factory to obtain state writers for operators from.</param> public void SaveState(IOperatorStateWriterFactory factory) => SaveStateCore(_subscription, factory);
public SaveStateVisitor(IOperatorStateWriterFactory factory)
{
_factory = factory;
}
