Class: Bud::PushArgAgg

Inherits:
PushGroup show all
Defined in:
lib/bud/executor/group.rb

Instance Attribute Summary

Attributes inherited from PushElement

#elem_name, #found_delta, #invalidated, #outputs, #pendings, #rescan, #wired_by

Attributes inherited from BudCollection

#accumulate_tick_deltas, #bud_instance, #cols, #invalidated, #is_source, #key_cols, #new_delta, #pending, #rescan, #scanner_cnt, #struct, #tabname, #wired_by

Instance Method Summary collapse

Methods inherited from PushGroup

#add_rescan_invalidate

Methods inherited from PushStatefulElement

#add_rescan_invalidate

Methods inherited from PushElement

#*, #<<, #add_rescan_invalidate, #all?, #any?, #argagg, #argmax, #argmin, #check_wiring, #each_with_index, #group, #include?, #inspected, #invalidate_tables, #join, #member?, #merge, #none?, #notin, #on_include?, #one?, #print_wiring, #pro, #push_out, #push_predicate, #reduce, #rescan_at_tick, #set_block, #sort, #stratum_end, #tick, #tick_deltas, #wire_to, #wirings

Methods inherited from BudCollection

#*, #<<, #<=, #[], #add_rescan_invalidate, #argagg, #argmax, #argmin, #bootstrap, #canonicalize_col, #close, #do_insert, #each, #each_delta, #each_raw, #each_tick_delta, #each_with_index, #empty?, #exists?, #flat_map, #flush_deltas, #group, #has_key?, #include?, #init_schema, #inspect, #inspected, #invalidate_at_tick, #keys, #length, #merge, #non_temporal_predecessors, #notin, #null_tuple, #pending_merge, #positive_predecessors, #prep_aggpairs, #pro, #qualified_tabname, #reduce, #register_coll_expr, #rename, #schema, #sort, #tick, #tick_deltas, #tick_metrics, #to_push_elem, #uniquify_tabname, #val_cols, #values

Methods included from Enumerable

#pro

Constructor Details

#initialize(elem_name, bud_instance, collection_name, keys_in, aggpairs_in, schema_in, &blk) ⇒ PushArgAgg

Returns a new instance of PushArgAgg.



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# File 'lib/bud/executor/group.rb', line 92

def initialize(elem_name, bud_instance, collection_name, keys_in, aggpairs_in, schema_in, &blk)
  unless aggpairs_in.length == 1
    raise Bud::Error, "multiple aggpairs #{aggpairs_in.map{|a| a.class.name}} in ArgAgg; only one allowed"
  end
  super(elem_name, bud_instance, collection_name, keys_in, aggpairs_in, schema_in, &blk)
  @winners = {}
end

Instance Method Details

#flush ⇒ Object 



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# File 'lib/bud/executor/group.rb', line 139

def flush
  # Don't emit fresh output unless a rescan is needed
  return unless @rescan
  @rescan = false

  @groups.each_key do |g|
    @winners[g].each do |t|
      push_out(t)
    end
  end
end

#insert(item, source) ⇒ Object 



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# File 'lib/bud/executor/group.rb', line 106

def insert(item, source)
  key = @keys.map{|k| item[k]}
  group_state = @groups[key]
  if group_state.nil?
    @groups[key] = @aggpairs.map do |ap|
      @winners[key] = [item]
      input_vals = item.values_at(*ap[1])
      ap[0].init(*input_vals)
    end
  else
    @aggpairs.each_with_index do |ap, agg_ix|
      input_vals = item.values_at(*ap[1])
      state_val, flag, *rest = ap[0].trans(group_state[agg_ix], *input_vals)
      group_state[agg_ix] = state_val

      case flag
      when :ignore
        # do nothing
      when :replace
        @winners[key] = [item]
      when :keep
        @winners[key] << item
      when :delete
        rest.each do |t|
          @winners[key].delete t
        end
      else
        raise Bud::Error, "strange result from argagg transition func: #{flag}"
      end
    end
  end
end

#invalidate_cache ⇒ Object 



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# File 'lib/bud/executor/group.rb', line 101

def invalidate_cache
  super
  @winners.clear
end