Class: EuCentralBank

Inherits:
Money::Bank::VariableExchange
  • Object
show all
Defined in:
lib/eu_central_bank.rb

Constant Summary collapse

CURRENCIES = 
%w(USD JPY BGN CZK DKK GBP HUF ILS PLN RON SEK CHF NOK HRK RUB TRY AUD BRL CAD CNY HKD IDR INR KRW MXN MYR NZD PHP SGD THB ZAR).map(&:freeze).freeze
ECB_RATES_URL = 
'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml'.freeze
ECB_90_DAY_URL = 
'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist-90d.xml'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#historical_last_updated ⇒ Object

Returns the value of attribute historical_last_updated.



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# File 'lib/eu_central_bank.rb', line 11

def historical_last_updated
  @historical_last_updated
end

#historical_rates_updated_at ⇒ Object

Returns the value of attribute historical_rates_updated_at.



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# File 'lib/eu_central_bank.rb', line 12

def historical_rates_updated_at
  @historical_rates_updated_at
end

#last_updated ⇒ Object

Returns the value of attribute last_updated.



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# File 'lib/eu_central_bank.rb', line 9

def last_updated
  @last_updated
end

#rates_updated_at ⇒ Object

Returns the value of attribute rates_updated_at.



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# File 'lib/eu_central_bank.rb', line 10

def rates_updated_at
  @rates_updated_at
end

Instance Method Details

#exchange(cents, from_currency, to_currency, date = nil) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 42

def exchange(cents, from_currency, to_currency, date=nil)
  exchange_with(Money.new(cents, from_currency), to_currency, date)
end

#exchange_with(from, to_currency, date = nil) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 46

def exchange_with(from, to_currency, date=nil)
  from_base_rate, to_base_rate = nil, nil
  rate = get_rate(from, to_currency, {:date => date})

  unless rate
    @mutex.synchronize do
      opts = { :date => date, :without_mutex => true }
      from_base_rate = get_rate("EUR", from.currency.to_s, opts)
      to_base_rate = get_rate("EUR", to_currency, opts)
    end
    rate = to_base_rate / from_base_rate
  end

  calculate_exchange(from, to_currency, rate)
end

#get_rate(from, to, opts = {}) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 62

def get_rate(from, to, opts = {})
  fn = -> { @rates[rate_key_for(from, to, opts)] }

  if opts[:without_mutex]
    fn.call
  else
    @mutex.synchronize { fn.call }
  end
end

#save_rates(cache, url = ECB_RATES_URL) ⇒ Object

Raises:



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# File 'lib/eu_central_bank.rb', line 26

def save_rates(cache, url=ECB_RATES_URL)
  raise InvalidCache unless cache
  File.open(cache, "w") do |file|
    io = open(url);
    io.each_line { |line| file.puts line }
  end
end

#save_rates_to_s(url = ECB_RATES_URL) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 38

def save_rates_to_s(url=ECB_RATES_URL)
  open(url).read
end

#set_rate(from, to, rate, opts = {}) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 72

def set_rate(from, to, rate, opts = {})
  fn = -> { @rates[rate_key_for(from, to, opts)] = rate }

  if opts[:without_mutex]
    fn.call
  else
    @mutex.synchronize { fn.call }
  end
end

#update_historical_rates(cache = nil) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 22

def update_historical_rates(cache=nil)
  update_parsed_historical_rates(doc(cache, ECB_90_DAY_URL))
end

#update_rates(cache = nil) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 18

def update_rates(cache=nil)
  update_parsed_rates(doc(cache))
end

#update_rates_from_s(content) ⇒ Object 



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# File 'lib/eu_central_bank.rb', line 34

def update_rates_from_s(content)
  update_parsed_rates(doc_from_s(content))
end