Class: Evanescence::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/evanescence/cache.rb

Overview

Simple implementation of caching

Instance Method Summary collapse

Constructor Details

#initialize(max_size:) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/evanescence/cache.rb', line 4

def initialize(max_size:)
  @items = {}
  @max_size = max_size
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/evanescence/cache.rb', line 33

def clear
  count_before_clear = count
  items.clear
  count_before_clear
end

#count ⇒ Object 



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# File 'lib/evanescence/cache.rb', line 39

def count
  items.count
end

#delete(key) ⇒ Object 



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# File 'lib/evanescence/cache.rb', line 29

def delete(key)
  items.delete(key)
end

#read(key) ⇒ Object 



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# File 'lib/evanescence/cache.rb', line 21

def read(key)
  item = items[key]
  return unless item

  item[1] += 1 if max_size
  item.first
end

#to_h ⇒ Object 



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# File 'lib/evanescence/cache.rb', line 9

def to_h
  items.transform_values(&:first)
end

#write(key, val) ⇒ Object 



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# File 'lib/evanescence/cache.rb', line 13

def write(key, val)
  reject_least_used_item if max_size
  existing_item = items[key]
  existing_item ? update_value(existing_item, val) : items[key] = [val, 1]

  items[key].first
end