public override TryCatch <CrossPartitionState <ChangeFeedState> > Visit(ChangeFeedStartFromContinuation startFromContinuation)
{
string continuationToken = startFromContinuation.Continuation;
TryCatch <CosmosArray> monadicCosmosArray = CosmosArray.Monadic.Parse(continuationToken);
if (monadicCosmosArray.Failed)
{
return(TryCatch <CrossPartitionState <ChangeFeedState> > .FromException(
new MalformedChangeFeedContinuationTokenException(
message : $"Array expected for change feed continuation token: {continuationToken}.",
innerException : monadicCosmosArray.Exception)));
}
CosmosArray cosmosArray = monadicCosmosArray.Result;
if (cosmosArray.Count == 0)
{
return(TryCatch <CrossPartitionState <ChangeFeedState> > .FromException(
new MalformedChangeFeedContinuationTokenException(
message : $"non empty array expected for change feed continuation token: {continuationToken}.")));
}
List <(FeedRangeInternal, ChangeFeedState)> rangeAndStates = new List <(FeedRangeInternal, ChangeFeedState)>();
foreach (CosmosElement arrayItem in cosmosArray)
{
TryCatch <ChangeFeedContinuationToken> monadicChangeFeedContinuationToken = ChangeFeedContinuationToken.MonadicConvertFromCosmosElement(arrayItem);
if (monadicChangeFeedContinuationToken.Failed)
{
return(TryCatch <CrossPartitionState <ChangeFeedState> > .FromException(
new MalformedChangeFeedContinuationTokenException(
message : $"Failed to parse change feed continuation token: {continuationToken}.",
innerException : monadicChangeFeedContinuationToken.Exception)));
}
ChangeFeedContinuationToken changeFeedContinuationToken = monadicChangeFeedContinuationToken.Result;
rangeAndStates.Add((changeFeedContinuationToken.Range, changeFeedContinuationToken.State));
}
CrossPartitionState <ChangeFeedState> crossPartitionState = new CrossPartitionState <ChangeFeedState>(rangeAndStates);
return(TryCatch <CrossPartitionState <ChangeFeedState> > .FromResult(crossPartitionState));
}
public abstract TResult Visit(ChangeFeedStartFromContinuation startFromContinuation);
public abstract void Visit(ChangeFeedStartFromContinuation startFromContinuation);