Exception: SplitIoClient::Splitter
- Inherits:
-
NoMethodError
- Object
- NoMethodError
- SplitIoClient::Splitter
- Defined in:
- lib/splitclient-rb/engine/evaluator/splitter.rb
Overview
Misc class in charge of providing hash functions and determination of treatment based on concept of buckets based on provided key
Instance Method Summary collapse
-
#bucket(hash_value) ⇒ Object
returns bucket value for the given hash value.
-
#count_hash(key, seed, legacy) ⇒ Object
returns a hash value for the give key, seed pair.
-
#get_treatment(id, seed, partitions, legacy_algo) ⇒ Object
gets the appropriate treatment based on id, seed and partition value.
-
#get_treatment_for_key(bucket, partitions) ⇒ Object
returns the treatment for a bucket given the partitions.
-
#hundred_percent_one_treatment?(partitions) ⇒ boolean
Checks if the partiotion size is 100%.
-
#initialize ⇒ Splitter
constructor
A new instance of Splitter.
- #legacy_hash(key, seed) ⇒ Object
- #murmur_hash(key, seed) ⇒ Object
-
#to_int32(number) ⇒ int
misc method to convert ruby number to int 32 since overflow is handled different to java.
Constructor Details
#initialize ⇒ Splitter
Returns a new instance of Splitter.
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 7 def initialize @murmur_hash = case RUBY_PLATFORM when 'java' Proc.new { |key, seed| Java::MurmurHash3.murmurhash3_x86_32(key, seed) } else Proc.new { |key, seed| Digest::MurmurHashMRI3_x86_32.rawdigest(key, [seed].pack('L')) } end end |
Instance Method Details
#bucket(hash_value) ⇒ Object
returns bucket value for the given hash value
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 119 def bucket(hash_value) (hash_value.abs % 100) + 1 end |
#count_hash(key, seed, legacy) ⇒ Object
returns a hash value for the give key, seed pair
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 54 def count_hash(key, seed, legacy) legacy ? legacy_hash(key, seed) : murmur_hash(key, seed) end |
#get_treatment(id, seed, partitions, legacy_algo) ⇒ Object
gets the appropriate treatment based on id, seed and partition value
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 34 def get_treatment(id, seed, partitions, legacy_algo) legacy = [1, nil].include?(legacy_algo) if partitions.empty? return SplitIoClient::Engine::Models::Treatment::CONTROL end if hundred_percent_one_treatment?(partitions) return (partitions.first).treatment end return get_treatment_for_key(bucket(count_hash(id, seed, legacy)), partitions) end |
#get_treatment_for_key(bucket, partitions) ⇒ Object
returns the treatment for a bucket given the partitions
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 101 def get_treatment_for_key(bucket, partitions) buckets_covered_thus_far = 0 partitions.each do |p| unless p.is_empty? buckets_covered_thus_far += p.size return p.treatment if buckets_covered_thus_far >= bucket end end return SplitIoClient::Engine::Models::Treatment::CONTROL end |
#hundred_percent_one_treatment?(partitions) ⇒ boolean
Checks if the partiotion size is 100%
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 22 def hundred_percent_one_treatment?(partitions) (partitions.size != 1) ? false : (partitions.first.size == 100) end |
#legacy_hash(key, seed) ⇒ Object
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 62 def legacy_hash(key, seed) h = 0 for i in 0..key.length-1 h = to_int32(31 * h + key[i].ord) end h^seed end |
#murmur_hash(key, seed) ⇒ Object
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 58 def murmur_hash(key, seed) @murmur_hash.call(key, seed) end |
#to_int32(number) ⇒ int
misc method to convert ruby number to int 32 since overflow is handled different to java
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# File 'lib/splitclient-rb/engine/evaluator/splitter.rb', line 78 def to_int32(number) begin sign = number < 0 ? -1 : 1 abs = number.abs return 0 if abs == 0 || abs == Float::INFINITY rescue return 0 end pos_int = sign * abs.floor int_32bit = pos_int % 2**32 return int_32bit - 2**32 if int_32bit >= 2**31 int_32bit end |