Class: MemoryCache

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MemoryCache

Returns a new instance of MemoryCache.



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# File 'lib/memory_cache.rb', line 4

def initialize
  self.cache = {}
end

Instance Attribute Details

#cache ⇒ Object

Returns the value of attribute cache.



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# File 'lib/memory_cache.rb', line 2

def cache
  @cache
end

Instance Method Details

#fetch(key, hash = { expires_in: 1.hour }, &block) ⇒ Object 



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# File 'lib/memory_cache.rb', line 8

def fetch(key, hash={ expires_in: 1.hour }, &block)
  validate?(key) ? read(key) : write(key, block.call, hash)['entry']
end

#read(key) ⇒ Object 



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# File 'lib/memory_cache.rb', line 12

def read(key)
  cache[key]['entry']
end

#validate?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/memory_cache.rb', line 20

def validate?(key)
  cache[key] && Time.now < cache[key]['valid_until']
end

#write(key, value, hash = { expires_in: 1.hour }) ⇒ Object 



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# File 'lib/memory_cache.rb', line 16

def write(key, value, hash={ expires_in: 1.hour })
  self.cache[key] = { 'valid_until' => (Time.now + hash[:expires_in]), 'entry' => value } unless value == '' || value == nil
end