public virtual void TestPartition()
{
// 本例的分区策略：希望将数据水平分成3份，前两份各占25%，第三份占50%。（故本例非均匀分区）
// |<---------------------1024------------------------>|
// |<----256--->|<----256--->|<----------512---------->|
// | partition0 | partition1 | partition2 |
// | 共2份,故count[0]=2 | 共1份，故count[1]=1 |
int[] count = {2, 1};
int[] length = {256, 512};
var pu = new PartitionUtil(count, length);
// 下面代码演示分别以offerId字段或memberId字段根据上述分区策略拆分的分配结果
var DefaultStrHeadLen = 8;
// cobar默认会配置为此值
long offerId = 12345;
var memberId = "qiushuo";
// 若根据offerId分配，partNo1将等于0，即按照上述分区策略，offerId为12345时将会被分配到partition0中
var partNo1 = pu.Partition(offerId);
// 若根据memberId分配，partNo2将等于2，即按照上述分区策略，memberId为qiushuo时将会被分到partition2中
var partNo2 = pu.Partition(memberId, 0, DefaultStrHeadLen);
Assert.AreEqual(0, partNo1);
Assert.AreEqual(2, partNo2);
}
public virtual void TestPartition()
{
// 本例的分区策略：希望将数据水平分成3份，前两份各占25%，第三份占50%。（故本例非均匀分区）
// |<---------------------1024------------------------>|
// |<----256--->|<----256--->|<----------512---------->|
// | partition0 | partition1 | partition2 |
// | 共2份,故count[0]=2 | 共1份，故count[1]=1 |
int[] count = { 2, 1 };
int[] length = { 256, 512 };
var pu = new PartitionUtil(count, length);
// 下面代码演示分别以offerId字段或memberId字段根据上述分区策略拆分的分配结果
var DefaultStrHeadLen = 8;
// cobar默认会配置为此值
long offerId = 12345;
var memberId = "qiushuo";
// 若根据offerId分配，partNo1将等于0，即按照上述分区策略，offerId为12345时将会被分配到partition0中
var partNo1 = pu.Partition(offerId);
// 若根据memberId分配，partNo2将等于2，即按照上述分区策略，memberId为qiushuo时将会被分到partition2中
var partNo2 = pu.Partition(memberId, 0, DefaultStrHeadLen);
Assert.AreEqual(0, partNo1);
Assert.AreEqual(2, partNo2);
}
public void Initialize()
{
_partitionUtilX = new PartitionUtil(_countX, _lengthX);
_partitionUtilY = new PartitionUtil(_countY, _lengthY);
BuildAll();
BuildByX();
BuildByY();
}
/// <returns>null if eval invalid type</returns>
private static int? Calculate(object eval,
PartitionUtil partitionUtil,
int keyType,
int hashSliceStart,
int hashSliceEnd)
{
if (eval == ExpressionConstants.Unevaluatable || eval == null)
return null;
switch (keyType)
{
case PartitionKeyTypeLong:
{
long longVal;
if (eval is Number)
{
longVal = (long)(Number)eval;
}
else if (eval is string)
{
longVal = long.Parse((string)eval);
}
else
{
throw new ArgumentException("unsupported data type for partition key: " + eval.GetType());
}
return partitionUtil.Partition(longVal);
}
case PartitionKeyTypeString:
{
var key = eval.ToString();
var start = hashSliceStart >= 0 ? hashSliceStart : key.Length + hashSliceStart;
var end = hashSliceEnd > 0 ? hashSliceEnd : key.Length + hashSliceEnd;
var hash = StringUtil.Hash(key, start, end);
return partitionUtil.Partition(hash);
}
default:
{
throw new ArgumentException("unsupported partition key type: " + keyType);
}
}
}
public override void Init()
{
PartitionUtil = new PartitionUtil(Count, Length);
}