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issue 8: reduce memory footprint of fnv hash func #9

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issue 8: reduce memory footprint of fnv hash func #9

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18 changes: 12 additions & 6 deletions .../src/main/scala/com/linkedin/norbert/network/partitioned/loadbalancer/HashFunctions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,10 @@
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.linkedin.norbert.network.partitioned.loadbalancer
package com.linkedin.norbert
package network
package partitioned
package loadbalancer

/**
* Object which provides hash function implementations.
Expand All @@ -32,11 +35,14 @@ object HashFunctions {
val FNV_BASIS = 0x811c9dc5
val FNV_PRIME = (1 << 24) + 0x193

def fnv(key: Array[Byte], hash: Long): Int = {
if (key.length == 0) hash.toInt
else fnv(key.drop(1), (hash ^ (0xFF & key.first)) * FNV_PRIME)
}
var hash: Long = FNV_BASIS
var i: Int = 0
var maxIdx: Int = bytes.length

fnv(bytes, FNV_BASIS)
while (i < maxIdx) {
hash = (hash ^ (0xFF & bytes(i))) * FNV_PRIME
i += 1
}
hash.toInt
}
}