public static Dictionary <int, Int32Range> GetRanges(int numShards)
{
if (numShards < 1)
{
throw new ArgumentOutOfRangeException(nameof(numShards), numShards, "numShards cannot be less than 1.");
}
var ranges = new Dictionary <int, Int32Range>(numShards);
const uint totalNumbersInRangeType = uint.MaxValue;
var rangeSize = (uint)Math.Ceiling(totalNumbersInRangeType / (decimal)numShards);
int shardNumber = 1;
int lowValue = int.MinValue;
while (shardNumber < numShards)
{
var highValue = (int)(lowValue + rangeSize);
var shardRange = new Int32Range(lowValue, highValue);
ranges.Add(shardNumber, shardRange);
shardNumber++;
lowValue = highValue;
}
// last range
if (lowValue < int.MaxValue)
{
var highValue = (lowValue + rangeSize);
if (highValue > int.MaxValue)
{
highValue = int.MaxValue;
}
var lastShardRange = new Int32Range(lowValue, (int)highValue);
ranges.Add(numShards, lastShardRange);
}
return(ranges);
}
public static Dictionary<int, Int32Range> GetRanges(int numShards)
{
if (numShards < 1)
{
throw new ArgumentOutOfRangeException(nameof(numShards), numShards, "numShards cannot be less than 1.");
}
var ranges = new Dictionary<int, Int32Range>(numShards);
const uint totalNumbersInRangeType = uint.MaxValue;
var rangeSize = (uint)Math.Ceiling(totalNumbersInRangeType / (decimal)numShards);
int shardNumber = 1;
int lowValue = int.MinValue;
while (shardNumber < numShards)
{
var highValue = (int)(lowValue + rangeSize);
var shardRange = new Int32Range(lowValue, highValue);
ranges.Add(shardNumber, shardRange);
shardNumber++;
lowValue = highValue;
}
// last range
if (lowValue < int.MaxValue)
{
var highValue = (lowValue + rangeSize);
if (highValue > int.MaxValue)
{
highValue = int.MaxValue;
}
var lastShardRange = new Int32Range(lowValue, (int)highValue);
ranges.Add(numShards, lastShardRange);
}
return ranges;
}
