Module: Hashish::ClassMethods

Defined in:
lib/acts_as_hashish/hashish.rb

Instance Method Summary collapse

Instance Method Details

#hashish_delete(key = nil) ⇒ Object 



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# File 'lib/acts_as_hashish/hashish.rb', line 40

def hashish_delete(key = nil)
  key ||= hashish_get_key(hashish_list.first)
  prefix = @options[:key_prefix]
  Hashish.redis_connection.zrem("#{prefix}*", "#{prefix}@#{key}")
  hashish_remove_metadata("#{key}")
  Hashish.redis_connection.del("#{prefix}@#{key}")
end

#hashish_flush! ⇒ Object 



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# File 'lib/acts_as_hashish/hashish.rb', line 32

def hashish_flush!
  hashish_redis_keys.each{|x| Hashish.redis_connection.del(x)}
end

#hashish_insert(data, t = Time.now.to_i) ⇒ Object 



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# File 'lib/acts_as_hashish/hashish.rb', line 48

def hashish_insert(data, t = Time.now.to_i)
  if data.is_a?(Array)
    data.each do |d|
      hashish_single_insert(d, t)
    end
  elsif data.is_a?(Hash)
    hashish_single_insert(data, t)
  else
    raise "Data must be of type Hash or Array of Hash"
  end
end

#hashish_length ⇒ Object 



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# File 'lib/acts_as_hashish/hashish.rb', line 36

def hashish_length
  Hashish.redis_connection.zcard("#{@options[:key_prefix]}*")
end

#hashish_list(options = {}) ⇒ Object 



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# File 'lib/acts_as_hashish/hashish.rb', line 60

def hashish_list(options = {})
  page_no = options[:page_no] || 1
  page_size = options[:page_size] || 10
  
  max_time = options[:to] || '+inf'
  min_time = options[:from] || '-inf'
  
  filters = options[:filters] || {}
  sort_by = options[:sort_by] || nil
  sort_order = options[:sort_order] || nil
  
  offset = (page_no - 1) * page_size
  limit = offset + page_size
  
  # get the next seq no for search operations for this search instance (perhaps this entire section shld be oops based stuff but what the heck :E mayb later)
  seq = Hashish.redis_connection.incr("#{@options[:key_prefix]}#SEQUENCER")
  
  # search
  inter = []
  unless filters.empty?
    # inter = filters.map{|k,v| "#{@options[:key_prefix]}:#{k}:#{v}"}
    
    filters.each do |key, value|
      if value.is_a?(Array)
        union = []
        union_key = "#{@options[:key_prefix]}#UNION##{key}##{seq}"
        value.each do |v|
          union << "#{@options[:key_prefix]}!#{key}=#{v}"
        end
        Hashish.redis_connection.zunionstore(union_key, union.uniq)
        Hashish.redis_connection.expire(union_key, Hashish.redis_search_keys_ttl)
        inter << union_key
      else
        inter << "#{@options[:key_prefix]}!#{key}=#{value}"
      end
    end
    
  end
  
  full_list = "#{@options[:key_prefix]}*"
  
  # is the user askin for a cropped set of data (min/max date/time of nQ)
  if min_time == '-inf' and max_time == '+inf'
    inter << full_list
  else
    # copy the full list to different temp set
    all_items_key = "#{@options[:key_prefix]}#ALL_ITEMS##{seq}"
    Hashish.redis_connection.zunionstore(all_items_key, [full_list])
    Hashish.redis_connection.expire(all_items_key, Hashish.redis_search_keys_ttl * 60)
    # crop the set based on min/max (wish we had a 1 step zcroprangebyscore)
    Hashish.redis_connection.zremrangebyscore(all_items_key, "-inf", "(#{min_time}") if min_time != '-inf'
    Hashish.redis_connection.zremrangebyscore(all_items_key, "(#{max_time}", "+inf") if max_time != '+inf'
    inter << all_items_key
  end
  
  result_key = "#{@options[:key_prefix]}#RESULT##{seq}"
  Hashish.redis_connection.zinterstore(result_key, inter, :aggregate => 'max')
  Hashish.redis_connection.expire(result_key, Hashish.redis_search_keys_ttl * 60)
  result = nil
  if sort_by
    custom_sort_key = "#{@options[:key_prefix]}#CUSTOM_SORT##{seq}"
    Hashish.redis_connection.sort(result_key, :by => "*$#{sort_by}",:get => '*', :store => custom_sort_key, :order => sort_order)
    Hashish.redis_connection.expire(custom_sort_key, Hashish.redis_search_keys_ttl * 60)
    result = Hashish.redis_connection.lrange(custom_sort_key, offset, limit -1)
  else
    res_keys = Hashish.redis_connection.send("z#{(sort_order == 'DESC' ? 'rev' : '')}range".to_sym, result_key, offset, limit - 1)
    if res_keys.empty?
      result = []
    else
      result = Hashish.redis_connection.mget(*res_keys)
    end
  end
  result.compact.map{|x| JSON.parse(x) rescue x}
end

#hashish_rebuild(data = nil) ⇒ Object 



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# File 'lib/acts_as_hashish/hashish.rb', line 20

def hashish_rebuild(data = nil)
  hashish_wait_on_lock do
    data ||= hashish_list(:page_size => 0)
    hashish_flush!
  end
  begin
    yield if block_given?
  ensure
    hashish_insert(data, Time.now.to_i)
  end
end