/// <summary>
/// Gets the descendants of the given node from a snapshot of the current state of this instance.
/// </summary>
/// <param name="path">Path to the node</param>
/// <returns>A <see cref="Task"/> that resolves to the list of descendant node paths</returns>
public async Task <IList <string> > GetDescendantsFromSnapshot(string path)
{
Trace.TraceInformation($"RingMasterInstance.GetDescendantsFromSnapshot instanceId={this.Id}, path={path}");
byte[] snapshot = this.GetSnapshot();
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
var nodes = new List <string>();
using (var factory = new InMemoryFactory())
{
factory.LoadState = () =>
{
using (var stream = new MemoryStream(snapshot))
{
factory.LoadFrom(stream);
}
};
factory.OnFatalError = (message, exception) =>
{
Assert.Fail($"FatalError: message={message}, exception={exception}");
};
using (var backend = CreateBackend(factory))
{
using (var ringMaster = new CoreRequestHandler(backend))
{
await ringMaster.ForEachDescendant(
path,
RingMasterInstance.MaxGetChildrenEnumerationCount,
descendantPath => nodes.Add(descendantPath));
}
}
}
Trace.TraceInformation($"RingMasterInstance.GetDescendantsFromSnapshot-Completed instanceId={this.Id}, path={path}, descendantsCount={nodes.Count}");
return(nodes);
}