Class: Sinarey::LruCache

Inherits:
Object
  • Object
show all
Defined in:
lib/sinarey_cache/lru_redux/cache.rb,
lib/sinarey_cache/lru_redux/cache19.rb

Instance Method Summary collapse

Constructor Details

#initialize(max_size) ⇒ LruCache 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 3

def initialize(max_size)
  @max_size = max_size
  @data = {}
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 40

def [](key)
  found = true
  value = @data.delete(key){ found = false }
  if found
    @data[key] = value
  else
    nil
  end
end

#[]=(key, val) ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 50

def []=(key,val)
  @data.delete(key)
  @data[key] = val
  # this may seem odd see: http://bugs.ruby-lang.org/issues/8312
  @data.delete(@data.first[0]) if @data.length > @max_size
  val
end

#clear ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 77

def clear
  @data.clear
end

#count ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 81

def count
  @data.count
end

#delete(k) ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 73

def delete(k)
  @data.delete(k)
end

#each ⇒ Object Also known as: each_unsafe 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 58

def each
  array = @data.to_a
  array.reverse!.each do |pair|
    yield pair
  end
end

#fetch(key) ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 30

def fetch(key)
  found = true
  value = @data.delete(key){ found = false }
  if found
    @data[key] = value
  else
    yield if block_given?
  end
end

#getset(key) ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 18

def getset(key)
  found = true
  value = @data.delete(key){ found = false }
  if found
    @data[key] = value
  else
    result = @data[key] = yield
    @data.delete(@data.first[0]) if @data.length > @max_size
    result
  end
end

#max_size=(size) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 8

def max_size=(size)
  raise ArgumentError.new(:max_size) if @max_size < 1
  @max_size = size
  if @max_size < @data.size
    @data.keys[0..@max_size-@data.size].each do |k|
      @data.delete(k)
    end
  end
end

#to_a ⇒ Object 



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 68

def to_a
  array = @data.to_a
  array.reverse!
end

#valid? ⇒ Boolean

for cache validation only, ensures all is sound



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# File 'lib/sinarey_cache/lru_redux/cache.rb', line 87

def valid?
  true
end