Class: BaseCache

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

Overview

Copyright © 2007-2010 Logintas AG Switzerland

This file is part of Libisi.

Libisi is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Libisi is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Libisi. If not, see <www.gnu.org/licenses/>.

Direct Known Subclasses

FileCache

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ BaseCache

Returns a new instance of BaseCache.



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# File 'lib/libisi/cache/base.rb', line 21

def initialize(options = {})
  @maxcount = (options[:maxcount] or 1000)    
  @cache = OrderedHash.new
end

Instance Attribute Details

#maxcount ⇒ Object

Returns the value of attribute maxcount.



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# File 'lib/libisi/cache/base.rb', line 20

def maxcount
  @maxcount
end

Instance Method Details

#delete(key) ⇒ Object 



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# File 'lib/libisi/cache/base.rb', line 59

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

#fetch(key, options = {}, &block) ⇒ Object 



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# File 'lib/libisi/cache/base.rb', line 26

def fetch(key, options = {}, &block)
  if has_key?(key)
    return get(key)
  else
    raise "No block given" unless block
    value = case block.arity
     when 0
yield
     when 1
yield(key)
     when 2
yield(key, options)
     else
raise "Unexpected arity count of fetch block #{block.arity}"
     end
	
    set(key,value)
    value
  end
end

#get(key) ⇒ Object 



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# File 'lib/libisi/cache/base.rb', line 47

def get(key)
  @cache[key]
end

#has_key?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libisi/cache/base.rb', line 63

def has_key?(key)
  @cache.has_key?(key)
end

#set(key, value) ⇒ Object 



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# File 'lib/libisi/cache/base.rb', line 51

def set(key, value)
  while @cache.length >= maxcount
    @cache.delete(@cache.first.keys[0])
  end
  
  @cache[key] = value
end