public static ReadFeedCrossFeedRangeState CreateFromContinuation(CosmosElement continuation, FeedRange feedRange)
{
if (!(feedRange is FeedRangeInternal feedRangeInternal))
{
throw new ArgumentException($"{nameof(feedRange)} needs to be a {nameof(FeedRangeInternal)}.");
}
return(new ReadFeedCrossFeedRangeState(
new List <FeedRangeState <ReadFeedState> >()
{
new FeedRangeState <ReadFeedState>(feedRangeInternal, ReadFeedState.Continuation(continuation))
}));
}
public ReadFeedIteratorCore(
IDocumentContainer documentContainer,
string continuationToken,
ReadFeedPaginationOptions readFeedPaginationOptions,
QueryRequestOptions queryRequestOptions,
CancellationToken cancellationToken)
{
this.queryRequestOptions = queryRequestOptions;
readFeedPaginationOptions ??= ReadFeedPaginationOptions.Default;
if (!string.IsNullOrEmpty(continuationToken))
{
bool isNewArrayFormat = (continuationToken.Length >= 2) && (continuationToken[0] == '[') && (continuationToken[continuationToken.Length - 1] == ']');
if (!isNewArrayFormat)
{
// One of the two older formats
if (!FeedRangeContinuation.TryParse(continuationToken, out FeedRangeContinuation feedRangeContinuation))
{
// Backward compatible with old format
feedRangeContinuation = new FeedRangeCompositeContinuation(
containerRid: string.Empty,
FeedRangeEpk.FullRange,
new List <Documents.Routing.Range <string> >()
{
new Documents.Routing.Range <string>(
Documents.Routing.PartitionKeyInternal.MinimumInclusiveEffectivePartitionKey,
Documents.Routing.PartitionKeyInternal.MaximumExclusiveEffectivePartitionKey,
isMinInclusive: true,
isMaxInclusive: false)
},
continuationToken);
}
// need to massage it a little
List <CosmosElement> feedRangeStates = new List <CosmosElement>();
string oldContinuationFormat = feedRangeContinuation.ToString();
if (feedRangeContinuation.FeedRange is FeedRangePartitionKey feedRangePartitionKey)
{
CosmosObject cosmosObject = CosmosObject.Parse(oldContinuationFormat);
CosmosArray continuations = (CosmosArray)cosmosObject["Continuation"];
if (continuations.Count != 1)
{
throw new InvalidOperationException("Expected only one continuation for partition key queries");
}
CosmosElement continuation = continuations[0];
CosmosObject continuationObject = (CosmosObject)continuation;
CosmosElement token = continuationObject["token"];
ReadFeedState state;
if (token is CosmosNull)
{
state = ReadFeedState.Beginning();
}
else
{
CosmosString tokenAsString = (CosmosString)token;
state = ReadFeedState.Continuation(CosmosElement.Parse(tokenAsString.Value));
}
FeedRangeState <ReadFeedState> feedRangeState = new FeedRangeState <ReadFeedState>(feedRangePartitionKey, state);
feedRangeStates.Add(ReadFeedFeedRangeStateSerializer.ToCosmosElement(feedRangeState));
}
else
{
CosmosObject cosmosObject = CosmosObject.Parse(oldContinuationFormat);
CosmosArray continuations = (CosmosArray)cosmosObject["Continuation"];
foreach (CosmosElement continuation in continuations)
{
CosmosObject continuationObject = (CosmosObject)continuation;
CosmosObject rangeObject = (CosmosObject)continuationObject["range"];
string min = ((CosmosString)rangeObject["min"]).Value;
string max = ((CosmosString)rangeObject["max"]).Value;
CosmosElement token = continuationObject["token"];
FeedRangeInternal feedRange = new FeedRangeEpk(new Documents.Routing.Range <string>(min, max, isMinInclusive: true, isMaxInclusive: false));
ReadFeedState state;
if (token is CosmosNull)
{
state = ReadFeedState.Beginning();
}
else
{
CosmosString tokenAsString = (CosmosString)token;
state = ReadFeedState.Continuation(CosmosElement.Parse(tokenAsString.Value));
}
FeedRangeState <ReadFeedState> feedRangeState = new FeedRangeState <ReadFeedState>(feedRange, state);
feedRangeStates.Add(ReadFeedFeedRangeStateSerializer.ToCosmosElement(feedRangeState));
}
}
CosmosArray cosmosArrayContinuationTokens = CosmosArray.Create(feedRangeStates);
continuationToken = cosmosArrayContinuationTokens.ToString();
}
}
TryCatch <ReadFeedCrossFeedRangeState> monadicReadFeedState;
if (continuationToken == null)
{
FeedRange feedRange;
if ((this.queryRequestOptions != null) && this.queryRequestOptions.PartitionKey.HasValue)
{
feedRange = new FeedRangePartitionKey(this.queryRequestOptions.PartitionKey.Value);
}
else if ((this.queryRequestOptions != null) && (this.queryRequestOptions.FeedRange != null))
{
feedRange = this.queryRequestOptions.FeedRange;
}
else
{
feedRange = FeedRangeEpk.FullRange;
}
monadicReadFeedState = TryCatch <ReadFeedCrossFeedRangeState> .FromResult(ReadFeedCrossFeedRangeState.CreateFromBeginning(feedRange));
}
else
{
monadicReadFeedState = ReadFeedCrossFeedRangeState.Monadic.Parse(continuationToken);
}
if (monadicReadFeedState.Failed)
{
this.monadicEnumerator = TryCatch <CrossPartitionReadFeedAsyncEnumerator> .FromException(monadicReadFeedState.Exception);
}
else
{
this.monadicEnumerator = TryCatch <CrossPartitionReadFeedAsyncEnumerator> .FromResult(
CrossPartitionReadFeedAsyncEnumerator.Create(
documentContainer,
new CrossFeedRangeState <ReadFeedState>(monadicReadFeedState.Result.FeedRangeStates),
readFeedPaginationOptions,
cancellationToken));
}
this.hasMoreResults = true;
}