Class: Bart::Client::Estimates

Inherits:
API
  • Object
show all
Defined in:
lib/bart_api/client/estimates.rb

Constant Summary collapse

RESOLUTION =

seconds

30

Instance Method Summary collapse

Methods inherited from API

#get_request, include_api, #post_request, #refresh, require_all, singleton

Methods included from Bart::Connection

#adapter, #connection, #register_adapter

Instance Method Details

#get(stop_id, platform: nil, direction: nil) ⇒ Object Also known as: find

We need to memoize but never for longer than ‘RESOLUTION`, so rather than use Memoist this API maintains its own memo.



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# File 'lib/bart_api/client/estimates.rb', line 11

def get stop_id, platform: nil, direction: nil
  @memo ||= {}
  model, stored_at = @memo[[stop_id, platform, direction]]
  return model if stored_at && 
    Time.now - Bart.configuration.refresh_time < stored_at

  parsed = get_request '/api/etd.aspx', query: { 
    cmd: :etd, 
    orig: stop_id,
    plat: platform,
    dir: direction
  }.select { |_,v| v != nil }

  parsed['root']['station'].tap do |station|
    station['etd'] = [station['etd']].flatten
    station['etd'].each do |etd|
      etd['estimate'] = [etd['estimate']].flatten
    end
  end

  model = Stop.new parsed['root']['station']
  @memo[[stop_id, platform, direction]] = [model, Time.now]
  model
end

#key(stop_id, platform, direction) ⇒ Object 



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# File 'lib/bart_api/client/estimates.rb', line 5

def key stop_id, platform, direction
  [stop_id, platform, direction]
end