Class: Currency::Exchange::Rate::Source::Failover

Inherits:
Base
  • Object
show all
Defined in:
lib/currency/exchange/rate/source/failover.rb

Overview

Gets Rates from primary source, if primary fails, attempts secondary source.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#primary ⇒ Object

Primary rate source.



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# File 'lib/currency/exchange/rate/source/failover.rb', line 11

def primary
  @primary
end

#secondary ⇒ Object

Secondary rate source if primary fails.



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# File 'lib/currency/exchange/rate/source/failover.rb', line 14

def secondary
  @secondary
end

Instance Method Details

#clear_rates ⇒ Object 



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# File 'lib/currency/exchange/rate/source/failover.rb', line 21

def clear_rates
  @primary.clear_rates
  @secondary.clear_rates
  super
end

#get_rate(c1, c2, time) ⇒ Object 



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# File 'lib/currency/exchange/rate/source/failover.rb', line 28

def get_rate(c1, c2, time)
  rate = nil

  # Try primary.
  err = nil
  begin
    rate = @primary.get_rate(c1, c2, time)
  rescue Object => e
    err = e
  end


  if rate == nil || err
    $stderr.puts "Failover: primary failed for get_rate(#{c1}, #{c2}, #{time}) : #{err.inspect}"
    rate = @secondary.get_rate(c1, c2, time)
  end


  unless rate
    raise Currency::Exception::UnknownRate, 
    [ 
     "Failover: secondary failed for get_rate(#{c1}, #{c2}, #{time})", 
     :c1, c1,
     :c2, c2, 
     :time, time,
    ]
  end

  rate
end

#name ⇒ Object 



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# File 'lib/currency/exchange/rate/source/failover.rb', line 16

def name
  "failover(#{primary.name}, #{secondary.name})"
end