Class: BasicTTLCache

Inherits:
Object show all
Defined in:
puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BasicTTLCache

Returns a new instance of BasicTTLCache.



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# File 'puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb', line 32

def initialize
  @cache = {}
end

Instance Method Details

#delete(key) ⇒ Object 



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# File 'puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb', line 40

def delete(key)
  @cache.delete(key) if @cache.key?(key)
end

#read(key) ⇒ Object 



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# File 'puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb', line 54

def read(key)
  if valid?key
    return @cache[key].value
  end
  nil
end

#read_stale(key) ⇒ Object 



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# File 'puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb', line 61

def read_stale(key)
  if @cache.key?(key)
    return @cache[key].value
  end
  nil
end

#valid?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb', line 44

def valid?(key)
  # If the key exists, and its ttl has not expired, return true.
  # Return false (and maybe clean up the stale entry) otherwise.
  return false unless @cache.key?(key)
  t = Time.now.to_i
  return true if @cache[key].valid?t

  false
end

#write(key, value, ttl) ⇒ Object 



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# File 'puppet/modules/wmflib/lib/puppet/parser/functions/ipresolve.rb', line 36

def write(key, value, ttl)
  @cache[key] = DNSCacheEntry.new(value, ttl)
end