Class: Ec2Meta::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/ec2_meta/cache.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/ec2_meta/cache.rb', line 5

def initialize
  @cache = {}
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/ec2_meta/cache.rb', line 34

def clear
  @cache.clear
end

#delete(key) ⇒ Object 



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# File 'lib/ec2_meta/cache.rb', line 30

def delete(key)
  @cache.delete(key)
end

#exist?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ec2_meta/cache.rb', line 26

def exist?(key)
  @cache.key?(key.to_s)
end

#fetch(key) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/ec2_meta/cache.rb', line 17

def fetch(key)
  return read(key) if exist?(key)

  raise ArgumentError, 'require block' unless block_given?

  value = yield
  write(key, value)
end

#read(key) ⇒ Object 



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# File 'lib/ec2_meta/cache.rb', line 13

def read(key)
  @cache[key.to_s]
end

#write(key, value) ⇒ Object 



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# File 'lib/ec2_meta/cache.rb', line 9

def write(key, value)
  @cache[key.to_s] = value
end