public async Task <IReadOnlyCollection <StorageEvent> > ReadStreamForwards(string streamId, int startPosition, int numberOfEventsToRead)
{
int endPosition = numberOfEventsToRead == int.MaxValue ? int.MaxValue : startPosition + numberOfEventsToRead;
var eventsQuery = this.client.CreateDocumentQuery <DocumentDbStorageEvent>(commitsLink)
.Where(x => x.StreamId == streamId && x.EventNumber >= startPosition && x.EventNumber <= endPosition)
.OrderBy(x => x.EventNumber)
.AsDocumentQuery();
var events = new List <StorageEvent>();
while (eventsQuery.HasMoreResults)
{
var response = await eventsQuery.ExecuteNextAsync <DocumentDbStorageEvent>();
loggingOptions.OnSuccess(ResponseInformation.FromReadResponse(nameof(ReadStreamForwards), response));
foreach (var e in response)
{
events.Add(e.ToStorageEvent(this.typeMap));
}
}
return(events.AsReadOnly());
}
public async Task <IReadOnlyCollection <StorageEvent> > ReadStreamForwardsFromLast(string streamId, Predicate <StorageEvent> readFromHere)
{
using (var eventsQuery = client.CreateDocumentQuery <DocumentDbStorageEvent>(commitsLink)
.Where(x => x.StreamId == streamId)
.OrderByDescending(x => x.EventNumber)
.AsDocumentQuery())
{
var eventsInReverseOrder = new List <StorageEvent>();
var finished = false;
while (!finished && eventsQuery.HasMoreResults)
{
var response = await eventsQuery.ExecuteNextAsync <DocumentDbStorageEvent>();
loggingOptions.OnSuccess(ResponseInformation.FromReadResponse(nameof(ReadStreamForwardsFromLast), response));
foreach (var e in response)
{
var storageEvent = e.ToStorageEvent(typeMap);
eventsInReverseOrder.Add(storageEvent);
if (readFromHere(storageEvent))
{
finished = true;
break;
}
}
}
return(eventsInReverseOrder
.Reverse <StorageEvent>()
.ToList()
.AsReadOnly());
}
}
