Class: Jaeger::Samplers::RemoteControlled

Inherits:
Object
  • Object
show all
Defined in:
lib/jaeger/samplers/remote_controlled.rb,
lib/jaeger/samplers/remote_controlled/instructions_fetcher.rb

Defined Under Namespace

Classes: InstructionsFetcher

Constant Summary collapse

DEFAULT_REFRESH_INTERVAL = 
60
DEFAULT_SAMPLING_HOST = 
'localhost'.freeze
DEFAULT_SAMPLING_PORT = 
5778

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ RemoteControlled

Returns a new instance of RemoteControlled.



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# File 'lib/jaeger/samplers/remote_controlled.rb', line 14

def initialize(opts = {})
  @sampler = opts.fetch(:sampler, Probabilistic.new)
  @logger = opts.fetch(:logger, Logger.new($stdout))

  @poll_executor = opts[:poll_executor] || begin
    refresh_interval = opts.fetch(:refresh_interval, DEFAULT_REFRESH_INTERVAL)
    RecurringExecutor.new(interval: refresh_interval)
  end

  @instructions_fetcher = opts[:instructions_fetcher] || begin
    service_name = opts.fetch(:service_name)
    host = opts.fetch(:host, DEFAULT_SAMPLING_HOST)
    port = opts.fetch(:port, DEFAULT_SAMPLING_PORT)
    InstructionsFetcher.new(host: host, port: port, service_name: service_name)
  end
end

Instance Attribute Details

#sampler ⇒ Object (readonly)

Returns the value of attribute sampler.



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# File 'lib/jaeger/samplers/remote_controlled.rb', line 12

def sampler
  @sampler
end

Instance Method Details

#poll ⇒ Object 



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# File 'lib/jaeger/samplers/remote_controlled.rb', line 37

def poll
  @logger.debug 'Fetching sampling strategy'

  instructions = @instructions_fetcher.fetch
  handle_instructions(instructions)
rescue InstructionsFetcher::FetchFailed => e
  @logger.warn "Fetching sampling strategy failed: #{e.message}"
end

#sample(*args) ⇒ Object 



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# File 'lib/jaeger/samplers/remote_controlled.rb', line 31

def sample(*args)
  @poll_executor.start(&method(:poll)) unless @poll_executor.running?

  @sampler.sample(*args)
end