Class: ScoutApm::ScoredItemSet

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/scout_apm/scored_item_set.rb

Constant Summary collapse

ARBITRARILY_LARGE =

A number larger than any score we will actually get.

100000000
DEFAULT_MAX_SIZE =

Without otherwise saying, default the size to this

10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(max_size = DEFAULT_MAX_SIZE) ⇒ ScoredItemSet

Returns a new instance of ScoredItemSet.



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# File 'lib/scout_apm/scored_item_set.rb', line 20

def initialize(max_size = DEFAULT_MAX_SIZE)
  @items = {}
  @max_size = max_size
end

Instance Attribute Details

#items ⇒ Object (readonly)

Returns the value of attribute items.



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# File 'lib/scout_apm/scored_item_set.rb', line 18

def items
  @items
end

#max_size ⇒ Object (readonly)

Returns the value of attribute max_size.



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# File 'lib/scout_apm/scored_item_set.rb', line 17

def max_size
  @max_size
end

Instance Method Details

#<<(new_item) ⇒ Object

This function is a large if statement, with a few branches. See inline comments for each branch.



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# File 'lib/scout_apm/scored_item_set.rb', line 32

def <<(new_item)
  return if new_item.name == :unknown

  # If we have this item in the hash already, compare the new & old ones, and store
  # the new one only if it's higher score.
  if items.has_key?(new_item.name)
    if new_item.score > items[new_item.name].first
      store!(new_item)
    end


  # If the set is full, then we have to see if we evict anything to store
  # this one
  elsif full?
    smallest_name, smallest_score = items.inject([nil, ARBITRARILY_LARGE]) do |(memo_name, memo_score), (name, (stored_score, _))|
      if stored_score < memo_score
        [name, stored_score]
      else
        [memo_name, memo_score]
      end
    end

    if smallest_score < new_item.score
      items.delete(smallest_name)
      store!(new_item)
    end


  # Set isn't full, and we've not seen this new_item, so go ahead and store it.
  else
    store!(new_item)
  end
end

#each ⇒ Object 



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# File 'lib/scout_apm/scored_item_set.rb', line 25

def each
  items.each do |(_, (_, item))|
    yield item
  end
end