Class: LRUCache
- Inherits:
-
Object
- Object
- LRUCache
- Defined in:
- lib/data_structures/lru_cache.rb
Instance Method Summary collapse
- #add_after_key(ref_key, key, val) ⇒ Object
- #add_before_key(ref_key, key, val) ⇒ Object
- #append(key, val) ⇒ Object
- #empty? ⇒ Boolean
- #find(key) ⇒ Object
- #first ⇒ Object
- #include?(key) ⇒ Boolean
-
#initialize(max_size) ⇒ LRUCache
constructor
A new instance of LRUCache.
- #inspect ⇒ Object
- #last ⇒ Object
- #length ⇒ Object
- #prepend(key, val) ⇒ Object
- #remove(key) ⇒ Object
- #to_a ⇒ Object
- #to_s ⇒ Object
Constructor Details
#initialize(max_size) ⇒ LRUCache
Returns a new instance of LRUCache.
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# File 'lib/data_structures/lru_cache.rb', line 4 def initialize(max_size) @max_size = max_size @size = 0 @hash = {} @linked_list = LinkedList.new end |
Instance Method Details
#add_after_key(ref_key, key, val) ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 73 def add_after_key(ref_key, key, val) node = @linked_list.add_after_key(ref_key, key, val) @hash[key] = node if @size == @max_size remove_node(:first) else @size += 1 end node end |
#add_before_key(ref_key, key, val) ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 86 def add_before_key(ref_key, key, val) node = @linked_list.add_before_key(ref_key, key, val) @hash[key] = node if @size == @max_size remove_node(:last) else @size += 1 end node end |
#append(key, val) ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 47 def append(key, val) node = @linked_list.append(key, val) @hash[key] = node if @size == @max_size remove_node(:first) else @size += 1 end node end |
#empty? ⇒ Boolean
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# File 'lib/data_structures/lru_cache.rb', line 23 def empty? @size == 0 end |
#find(key) ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 39 def find(key) @hash[key] end |
#first ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 31 def first @linked_list.first end |
#include?(key) ⇒ Boolean
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# File 'lib/data_structures/lru_cache.rb', line 43 def include?(key) @hash.has_key?(key) end |
#inspect ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 19 def inspect @linked_list.inspect end |
#last ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 35 def last @linked_list.last end |
#length ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 27 def length @size end |
#prepend(key, val) ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 60 def prepend(key, val) node = @linked_list.prepend(key, val) @hash[key] = node if @size == @max_size remove_node(:last) else @size += 1 end node end |
#remove(key) ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 99 def remove(key) node = self.find(key) return nil if node.nil? @linked_list.remove(key) @hash.delete(key) @size -= 1 node end |
#to_a ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 11 def to_a @linked_list.to_a end |
#to_s ⇒ Object
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# File 'lib/data_structures/lru_cache.rb', line 15 def to_s @linked_list.to_s end |