Class: Milkshake::Cache

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/milkshake/cache.rb', line 7

def initialize(path)
  @path = path
  begin
    File.open(@path, 'r') { |file| @entries = Marshal.load(file.read) }
    raise 'wrong type' unless Hash === @entries
  rescue
    @entries = {}
  end
  @history = []
end

Instance Attribute Details

#entries ⇒ Object

Returns the value of attribute entries.



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

def entries
  @entries
end

#history ⇒ Object

Returns the value of attribute history.



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

def history
  @history
end

#path ⇒ Object

Returns the value of attribute path.



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

def path
  @path
end

Instance Method Details

#[](name) ⇒ Object 



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

def [](name)
  @entries[name.to_s]
end

#[]=(name, value) ⇒ Object 



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

def []=(name, value)
  @entries[name.to_s] = value
end

#key(name) ⇒ Object 



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# File 'lib/milkshake/cache.rb', line 18

def key(name)
  name = name.to_s
  if @entries.key?(name)
    @entries[name]
  elsif block_given?
    @entries[name] = yield
  else
    nil
  end
end

#persist! ⇒ Object 



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# File 'lib/milkshake/cache.rb', line 46

def persist!
  File.open(@path, 'w+') { |file| file.write Marshal.dump(@entries) }
end

#reset! ⇒ Object 



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# File 'lib/milkshake/cache.rb', line 37

def reset!
  @history << @entries
  @entries = {}
end

#restore! ⇒ Object 



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# File 'lib/milkshake/cache.rb', line 42

def restore!
  @entries = @history.pop || {}
end