Class: Xampl::XamplCache

Inherits:
Object
  • Object
show all
Defined in:
lib/xamplr/persisters/caches.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(capacity = DEFAULT_CAPACITY) ⇒ XamplCache

Returns a new instance of XamplCache.



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# File 'lib/xamplr/persisters/caches.rb', line 19

def initialize(capacity=DEFAULT_CAPACITY)
  @capacity = capacity
  @now = 0
  @size = 0
  @cache = {}
end

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



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# File 'lib/xamplr/persisters/caches.rb', line 17

def cache
  @cache
end

#capacity ⇒ Object (readonly)

Returns the value of attribute capacity.



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# File 'lib/xamplr/persisters/caches.rb', line 17

def capacity
  @capacity
end

Instance Method Details

#delete(key) ⇒ Object 



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# File 'lib/xamplr/persisters/caches.rb', line 31

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

#fetch(key, default_value = nil) ⇒ Object Also known as: [] 



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# File 'lib/xamplr/persisters/caches.rb', line 60

def fetch(key, default_value=nil)
  pair = @cache[key]
  if pair then
    pair[1] = (@now += 1)
    return pair[0]
  else
    return default_value
  end
end

#limit ⇒ Object 



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# File 'lib/xamplr/persisters/caches.rb', line 35

def limit
  victim = nil
  actual_victim = nil
  min = 1 + @now
  @size = 0
  @cache.each do |key, pair|
    possibility = pair[0]
    if (not possibility.load_needed) and pair[1] < min then
      @size += 1
      victim = key
      actual_victim = possibility
      min = pair[1]
    end
  end
#puts
  #puts
  #puts "REMOVE FROM CACHE(XamplCache): victim: #{victim}, actual: #{actual_victim}"
  #puts " size: #{@size}, physical size: #{@cache.size}"
  #puts
  #puts
  #@cache.delete(victim)
  actual_victim.force_load if actual_victim
#puts ">>>>>>> #{actual_victim.load_needed} #{actual_victim.class.name}" if actual_victim
end

#print(out = "") ⇒ Object 



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# File 'lib/xamplr/persisters/caches.rb', line 86

def print(out = "")
  out << "Cache (standard) with capacity: #{@capacity}, current size: #{@size}\n"
  @cache.each do |key, pair|
    out << sprintf("  key: '%s', value: '%s', accessed: %s\n",
                   key, pair[0], pair[1])
  end
  out
end

#size ⇒ Object 



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# File 'lib/xamplr/persisters/caches.rb', line 26

def size
  #@cache.size
  return @size
end

#store(key, value) ⇒ Object Also known as: []= 



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# File 'lib/xamplr/persisters/caches.rb', line 70

def store(key, value)
  if (@capacity <= @size) then
    self.limit
  end

  pair = @cache[key]
  if pair then
    pair[0] = value
    pair[1] = (@now += 1)
  else
    @cache[key] = [value, (@now += 1)]
  end

  return value
end