Module: ArCache::ClassMethods

Defined in:
lib/ar_cache.rb

Instance Method Summary collapse

Instance Method Details

#cache_find(id, params = nil) ⇒ Object

Perform a query on dabatase and store result in FileSystem.

To uniquify the file name the library calculate MD5 hash for classname, id and params, if result for query exist and isn’t expired it return the cached result otherwise DB is queried and the results is stored in FileSystem. TODO: Support for Eeager-loading



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# File 'lib/ar_cache.rb', line 26

def cache_find(id, params=nil)
  class_name = self.class.name
  
  if (params.nil?)
    params = Array.new
  end
  
  filename   = calculate_file_name(id, params)
  if cache_reset?(filename)
    cache_reset(id, params)
  end
  
  if File.exist?(filename)
    content = File.read(filename)
    toReturn = JSON.parse(content)
  else
    toReturn = self.find(id, params)
    File.open(filename, 'w') do |f|
      f.write toReturn.to_json
      f.close
    end
    toReturn = JSON.parse(toReturn.to_json)
  end
  if id == :all
    out = Array.new
    toReturn.each do |obj|
      out << hash_to_obj(obj.values.first)
    end
  else
    toReturn = toReturn.first
    out = hash_to_obj(toReturn.values.first)
  end
  return out
end

#cache_find_all(params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 69

def cache_find_all(params=nil)
  return cache_find(:all, params)
end

#cache_find_first(params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 61

def cache_find_first(params=nil)
  return cache_find(:first, params)
end

#cache_find_last(params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 65

def cache_find_last(params=nil)
  return cache_find(:last, params)
end

#cache_reset(id, params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 85

def cache_reset(id, params=nil)
  filename   = calculate_file_name(id, params)
  File.delete(filename)
end

#cache_reset_all(params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 81

def cache_reset_all(params=nil)
  return cache_reset(:all, params)
end

#cache_reset_first(params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 73

def cache_reset_first(params=nil)
  return cache_reset(:first, params)
end

#cache_reset_last(params = nil) ⇒ Object 



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# File 'lib/ar_cache.rb', line 77

def cache_reset_last(params=nil)
  return cache_reset(:last, params)
end