Use ruby object in logstash ruby filter

logstash.conf

input {
  stdin {}
}

filter {
  ruby {
    init => "load('ruby.rb'); @val=Myclasse.new('value')"
    code => "event['method']=@val.value()"
  }
}

output {
  # Debug sur la sortie standart
  stdout { codec => rubydebug }
}

ruby.rb

class Myclasse
    attr_reader :value
    attr_writer :value

    def initialize(value)
        @value = value
    end
end

run.sh

/opt/logstash/bin/logstash -f logstash.conf