Module: FlagpoleSitta::CacheSitta::ClassMethods

Defined in:
lib/flagpole_sitta/cache_sitta.rb

Instance Method Summary collapse

Instance Method Details

#array_cache_key_gen(key, route_id, options = {}) ⇒ Object

Options :emptystack will make it generate a key for the emptystack instead of the general cache array.



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 33

def array_cache_key_gen key, route_id, options={}

  mid_key = mid_key_gen route_id

  model = options[:model] || clazz


  if options[:emptystack]
    "#{model}/#{mid_key}/EmptyStack/#{key}"
  else
    "#{model}/#{mid_key}/#{key}"
  end

end

#clazz ⇒ Object 



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 19

def clazz
  self
end

#destroy_array_cache(options = {}) ⇒ Object

Nukes all corresponding caches for a given array.



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 124

def destroy_array_cache options={}

  each_cache options[:route_id] do |hash|
    #A Check in Case there is some type of cache failure, or it is an empty spot, also if it has no scope, or it falls in scope
    if hash.present? && (hash[:scope].nil? || options[:obj].in_scope(hash[:scope]))
      #Get all the associated.
      associated = FlagpoleSitta::CommonFs.flagpole_cache_read(hash[:key])[:associated]
      Rails.logger.info "#{hash[:key]} is being cleared"
      #Destroy the actually cache
      FlagpoleSitta::CommonFs.flagpole_cache_delete(hash[:key])
      #The associated objects will always include the object we got the actually cache from
      associated.each do |a|
        #Get the base key
        base_key = a.gsub(/\/[^\/]*\z/, "")
        #Get the flag. Capture the god damn flag!
        flag_key = base_key + "/Flag"
        #Get its location in the 'Array'
        n = a.split("/").last
        # Check in case of cache failure
        if flag = FlagpoleSitta::CommonFs.flagpole_cache_read(flag_key)
          #Add an empty spot to the 'Array'
          flag[:empty] = flag[:empty] + 1
          empty_stack_key = base_key + "/EmptyStack/" + flag[:empty].to_s
          #Save the empty spot location to the 'Stack'
          FlagpoleSitta::CommonFs.flagpole_cache_write(empty_stack_key, n)
          #Update the flag
          FlagpoleSitta::CommonFs.flagpole_cache_write(flag_key, flag)
        end

        #Finally get rid of the associated cache object.
        FlagpoleSitta::CommonFs.flagpole_cache_delete(a)
      end
    #Else It is not in scope so the cache lives to fight another day!
    end
  end

end

#each_cache(route_id = nil, &block) ⇒ Object

Loops through the array in the cache.



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 102

def each_cache route_id = nil, &block

  flag_key = array_cache_key_gen "Flag", route_id

  flag = FlagpoleSitta::CommonFs.flagpole_cache_read(flag_key)

  #AR - If there aren't any index do nothing.
  #Else wise loop through every index.
  #If it actually does exist then yield.
  if flag
    for i in 0..flag[:space] do
      array_key = array_cache_key_gen i, route_id
      hash = FlagpoleSitta::CommonFs.flagpole_cache_read(array_key)
      yield hash
    end
  end

  nil

end

#initialize_array_cache(route_id = nil) ⇒ Object

Creates the ‘array’ in the cache.



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 49

def initialize_array_cache route_id = nil

  flag_key = array_cache_key_gen "Flag", route_id

  flag = {:space => -1, :empty => -1}

  FlagpoleSitta::CommonFs.flagpole_cache_write(flag_key, flag)

  flag

end

#mid_key_gen(route_id) ⇒ Object

Determines if its for an index array or show array.



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 24

def mid_key_gen route_id
  if route_id
    mid_key = "#{route_id}/ShowArray"
  else
    mid_key = "IndexArray"
  end
end

#update_array_cache(key, options = {}) ⇒ Object

Updates the ‘array’ in the cache. Options :route_id which determines the type of mid_key



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# File 'lib/flagpole_sitta/cache_sitta.rb', line 63

def update_array_cache key, options={}

  flag_key = array_cache_key_gen "Flag", options[:route_id]

  flag = FlagpoleSitta::CommonFs.flagpole_cache_read(flag_key)

  #AR - If it doesn't exist start the process of creating it
  if flag.nil?
    flag = initialize_array_cache options[:route_id]
  end

  if flag[:empty] > -1
    #Find any empty container to use by popping it off of the top of the "stack".
    empty_key = array_cache_key_gen flag[:empty], options[:route_id], :emptystack => true

    i = FlagpoleSitta::CommonFs.flagpole_cache_read(empty_key)
    #Sense its going to be used remove its reference from the Stack.
    FlagpoleSitta::CommonFs.flagpole_cache_delete(empty_key)
    #Update the empty on flag to now hit the newest none used container on the stack.
    flag[:empty] = flag[:empty] - 1
  else
    #AR - update the array's end point
    flag[:space] = flag[:space] + 1
    i = flag[:space]
  end
 
  #AR - write out the new index at the end of the array
  array_key = array_cache_key_gen i, options[:route_id]
  FlagpoleSitta::CommonFs.flagpole_cache_write(array_key, {:key => key, :scope => options[:scope]})

  #AR - update flag in the cache
  flag_key = array_cache_key_gen "Flag", options[:route_id]
  FlagpoleSitta::CommonFs.flagpole_cache_write(flag_key, flag)

  array_key

end