private async Task <TokenEntity> Update(TokenEntity orig, long pos, long neg)
{
var table = _table();
int backoff = 1;
do
{
try
{
var newtoken = orig.Increment(pos, neg);
await table.ExecuteAsync(TableOperation.InsertOrReplace(newtoken));
return(newtoken);
}
catch (StorageException ex)
{
if (ex.RequestInformation.HttpStatusCode != (int)HttpStatusCode.PreconditionFailed &&
ex.RequestInformation.HttpStatusCode != (int)HttpStatusCode.Conflict)
{
throw;
}
await Task.Delay(backoff * 100);
backoff *= 2;
orig = await GetToken(table, orig.Token);
}
} while (backoff < 256);
throw new Exception("failed to update " + orig);
}
public TokenEntity Increment(long pos, long neg)
{
var merged = new TokenEntity(Classification, Token);
merged.Postives = Postives + pos;
merged.Negatives = Negatives + neg;
return(merged);
}
