Class: Skylight::Util::LruCache Private

Inherits:
Object
  • Object
show all
Defined in:
lib/skylight/util/lru_cache.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Instance Method Summary collapse

Constructor Details

#initialize(max_size) ⇒ LruCache

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of LruCache.



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# File 'lib/skylight/util/lru_cache.rb', line 5

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

Instance Method Details

#clear ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/skylight/util/lru_cache.rb', line 31

def clear
  @data.clear
end

#fetch(key) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Individual hash operations here are atomic in MRI.



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# File 'lib/skylight/util/lru_cache.rb', line 18

def fetch(key)
  found = true
  value = @data.delete(key) { found = false }

  value = yield if !found && block_given?

  @data[key] = value if value

  @data.shift if !found && value && @data.length > @max_size

  value
end

#max_size=(size) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Raises:

  • (ArgumentError) 


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# File 'lib/skylight/util/lru_cache.rb', line 10

def max_size=(size)
  raise ArgumentError, :max_size if @max_size < 1

  @max_size = size
  @data.shift while @data.size > @max_size
end