private async Task <RangeValue> GetNextMaxAsyncInner(IAsyncDatabaseCommands databaseCommands, long calculatedCapacity)
{
var minNextMax = Range.Max;
using (databaseCommands.ForceReadFromMaster())
using (databaseCommands.DisableAllCaching())
while (true)
{
try
{
ConflictException ce = null;
JsonDocument document;
try
{
document = await GetDocumentAsync(databaseCommands).ConfigureAwait(false);
}
catch (ConflictException e)
{
ce = e;
document = null;
}
if (ce != null)
{
return(await HandleConflictsAsync(databaseCommands, ce, minNextMax, calculatedCapacity).ConfigureAwait(false));
}
IncreaseCapacityIfRequired(ref calculatedCapacity);
long min, max;
if (document == null)
{
min = minNextMax + 1;
max = minNextMax + calculatedCapacity;
document = new JsonDocument
{
Etag = Etag.Empty,
// sending empty etag means - ensure the that the document does NOT exists
Metadata = new RavenJObject(),
DataAsJson = RavenJObject.FromObject(new { Max = max }),
Key = HiLoDocumentKey
};
}
else
{
var oldMax = GetMaxFromDocument(document, minNextMax, calculatedCapacity);
min = oldMax + 1;
max = oldMax + calculatedCapacity;
document.DataAsJson["Max"] = max;
}
await PutDocumentAsync(databaseCommands, document).ConfigureAwait(false);
return(new RangeValue(min, max));
}
catch (ConcurrencyException)
{
//expected & ignored, will retry this
// we'll try to increase the capacity
ModifyCapacityIfRequired(ref calculatedCapacity);
}
}
}
