module PulsarSdk::Producer::Murmur3

cpoy from github.com/funny-falcon/murmurhash3-ruby

Constants

MASK32

Public Instance Methods

hash(str, seed=0) click to toggle source
# File lib/pulsar_sdk/producer/router.rb, line 56
def hash(str, seed=0)
  h1 = seed
  numbers = str.unpack('V*C*')
  tailn = str.bytesize % 4
  tail = numbers.slice!(numbers.size - tailn, tailn)
  for k1 in numbers
    h1 ^= mmix(k1)
    h1 = rotl(h1, 13)
    h1 = (h1*5 + 0xe6546b64) & MASK32
  end

  unless tail.empty?
    k1 = 0
    tail.reverse_each do |c1|
      k1 = (k1 << 8) | c1
    end
    h1 ^= mmix(k1)
  end

  h1 ^= str.bytesize
  fmix(h1)
end
int32_hash(i, seed=0) click to toggle source
# File lib/pulsar_sdk/producer/router.rb, line 52
def int32_hash(i, seed=0)
  hash([i].pack("V"), seed)
end

Private Instance Methods

fmix(h) click to toggle source
# File lib/pulsar_sdk/producer/router.rb, line 84
def fmix(h)
  h &= MASK32
  h ^= h >> 16
  h = (h * 0x85ebca6b) & MASK32
  h ^= h >> 13
  h = (h * 0xc2b2ae35) & MASK32
  h ^ (h >> 16)
end
mmix(k1) click to toggle source
# File lib/pulsar_sdk/producer/router.rb, line 93
def mmix(k1)
  k1 = (k1 * 0xcc9e2d51) & MASK32
  k1 = rotl(k1, 15)
  (k1 * 0x1b873593) & MASK32
end
rotl(x, r) click to toggle source
# File lib/pulsar_sdk/producer/router.rb, line 80
def rotl(x, r)
  ((x << r) | (x >> (32 - r))) & MASK32
end