Class: Evaluator

Inherits:
Evaluation show all
Defined in:
lib/ff/ruby/server/sdk/api/evaluator.rb

Instance Method Summary collapse

Constructor Details

#initialize(repository, logger = nil) ⇒ Evaluator

Returns a new instance of Evaluator.



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 10

def initialize(repository, logger = nil)

  unless repository.kind_of?(Repository)
    raise "The 'repository' parameter must be of '" + Repository.to_s + "' data type"
  end

  if logger != nil
    @logger = logger
  else
    @logger = Logger.new(STDOUT)
  end

  @repository = repository
end

Instance Method Details

#bool_variation(identifier, target, default_value, callback) ⇒ Object 



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 25

def bool_variation(identifier, target, default_value, callback)

  variation = evaluate(identifier, target, "boolean", callback)

  if variation != nil
    return variation.value == "true"
  end

  SdkCodes::warn_default_variation_served @logger, identifier, target, default_value.to_s
  default_value
end

#evaluate(identifier, target, expected, callback) ⇒ Object 



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 84

def evaluate(identifier, target, expected, callback)

  if callback != nil
    unless callback.kind_of?(FlagEvaluateCallback)
      raise "The 'callback' parameter must be of '" + FlagEvaluateCallback.to_s + "' data type"
    end
  end

  flag = @repository.get_flag(identifier)

  # Check if flag exists
  if flag.nil?
    # Log a warning if the flag is not found
    @logger.warn "Flag not found for identifier '#{identifier}'. Serving default variation."
    return nil
  end

  # Check if the flag's kind matches the expected type
  unless flag.kind == expected
    @logger.warn "Flag kind mismatch: expected '#{expected}', but got '#{flag.kind}' for identifier '#{identifier}'. Serving default variation."
    return nil
  end

  # Proceed with prerequisite check if flag type is as expected
  if flag != nil && flag.kind == expected
    unless flag.prerequisites.empty?
      pre_req = check_pre_requisite(flag, target)
      unless pre_req
        return find_variation(flag.variations, flag.off_variation)
      end
    end

    variation = evaluate_flag(flag, target)

    if variation != nil
      if callback != nil
        feature_name = flag.feature
        variation_identifier = variation.identifier
        callback.process_evaluation(feature_name, target, variation_identifier)
      end
      return variation
    end
  end

  # Returning nil will indicate to callers to serve the default variation
  nil
end

#integer_variation(identifier, target, default_value, callback) ⇒ Object 



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 49

def integer_variation(identifier, target, default_value, callback)

  variation = evaluate(identifier, target, "int", callback)

  if variation != nil
    return variation.value.to_i
  end

  SdkCodes::warn_default_variation_served @logger, identifier, target, default_value.to_s
  default_value
end

#json_variation(identifier, target, default_value, callback) ⇒ Object 



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 72

def json_variation(identifier, target, default_value, callback)

  variation = evaluate(identifier, target, "json", callback)

  if variation != nil
    return JSON.parse(variation.value)
  end

  SdkCodes::warn_default_variation_served @logger, identifier, target, default_value.to_s
  default_value
end

#number_variation(identifier, target, default_value, callback) ⇒ Object 



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 61

def number_variation(identifier, target, default_value, callback)
  variation = evaluate(identifier, target, "int", callback)

  if variation != nil
    return variation.value.to_f
  end

  SdkCodes::warn_default_variation_served @logger, identifier, target, default_value.to_s
  default_value
end

#string_variation(identifier, target, default_value, callback) ⇒ Object 



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# File 'lib/ff/ruby/server/sdk/api/evaluator.rb', line 37

def string_variation(identifier, target, default_value, callback)

  variation = evaluate(identifier, target, "string", callback)

  if variation != nil
    return variation.value
  end

  SdkCodes::warn_default_variation_served @logger, identifier, target, default_value.to_s
  default_value
end