public IReactive <T> GetCurrentAsync()
{
return(Reactive.From <T>(async resultResolver =>
{
using (ContextualStream <T> childStream =
stream.CreateChildWithin(new CSScope(valueScope:
InfiniteIntervalScope.Create(
RWScope.Read, 0, null))))
using (IAccessContext <enumeratorScope> childEnumContext =
context.CreateChildWithin(new enumeratorScope(
RWScope.Read,
RWScope.Read)))
{
long curNextIndex =
await readNextIndex(childEnumContext);
childEnumContext.RequiredScope =
new enumeratorScope(RWScope.Read);
CSScope readValueScope = new CSScope(valueScope:
InfiniteIntervalScope.Create(
RWScope.Read, curNextIndex - 1, curNextIndex));
childStream.Context.RequiredScope = readValueScope;
node curNode =
await readCurrentNode(childEnumContext);
childEnumContext.Dispose();
if (curNode == null)
{
throw new InvalidOperationException(
"The enumerator is already disposed.");
}
await childStream.Context.UntilAvailable(
readValueScope);
resultResolver.Resolve(curNode.Value);
}
}));
}
