private async Task <IEnumerable <CompositeContinuationToken> > BuildCompositeTokensAsync(string initialContinuationToken)
{
if (string.IsNullOrEmpty(initialContinuationToken))
{
// Initialize composite token with all the ranges
IReadOnlyList <Documents.PartitionKeyRange> allRanges = await this.pkRangeCacheDelegate(
this.containerRid,
new Documents.Routing.Range <string>(
Documents.Routing.PartitionKeyInternal.MinimumInclusiveEffectivePartitionKey,
Documents.Routing.PartitionKeyInternal.MaximumExclusiveEffectivePartitionKey,
isMinInclusive: true,
isMaxInclusive: false),
false);
Debug.Assert(allRanges.Count != 0);
// Initial state for a scenario where user does not provide any initial continuation token.
// StartTime and StartFromBeginning can handle the logic if the user wants to start reading from any particular point in time
// After the first iteration, token will be updated with a recent value
return(allRanges.Select(e => StandByFeedContinuationToken.CreateCompositeContinuationTokenForRange(e.MinInclusive, e.MaxExclusive, null)));
}
try
{
return(StandByFeedContinuationToken.DeserializeTokens(initialContinuationToken));
}
catch (JsonReaderException ex)
{
throw new ArgumentOutOfRangeException($"Provided token has an invalid format: {initialContinuationToken}", ex);
}
}
