module SimpleCov::ResultMerger

def clear_resultset

Clear out the previously cached .resultset 
def clear_resultset
  @resultset = nil
end

def merge_and_store(*results) 

def merge_and_store(*results)
  result = merge_results(*results)
  store_result(result) if result
  result
end

def merge_results(*results)

on all source result's names
coverage data and the command_name for the result consisting of a join
Merge two or more SimpleCov::Results into a new one with merged 
def merge_results(*results)
  parsed_results = JSON.parse(JSON.dump(results.map(&:original_result)))
  combined_result = SimpleCov::Combine::ResultsCombiner.combine(*parsed_results)
  result = SimpleCov::Result.new(combined_result)
  # Specify the command name
  result.command_name = results.map(&:command_name).sort.join(", ")
  result
end

def merged_result


for the result consisting of a join on all source result's names
SimpleCov::Result with merged coverage data and the command_name
Gets all SimpleCov::Results from cache, merges them and produces a new
def merged_result
  merge_results(*results)
end

def results

dropped. Returns an array of SimpleCov::Result items.
All results that are above the SimpleCov.merge_timeout will be
of SimpleCov::Result from that.
Gets the resultset hash and re-creates all included instances 
def results
  results = Result.from_hash(resultset)
  results.select { |result| result.time_since_creation < SimpleCov.merge_timeout }
end

def resultset

caching it for subsequent accesses.
Loads the cached resultset from JSON and returns it as a Hash, 
def resultset
  @resultset ||= begin
    data = stored_data
    if data
      begin
        JSON.parse(data) || {}
      rescue StandardError
        {}
      end
    else
      {}
    end
  end
end

def resultset_path

The path to the .resultset.json cache file 
def resultset_path
  File.join(SimpleCov.coverage_path, ".resultset.json")
end

def resultset_writelock 

def resultset_writelock
  File.join(SimpleCov.coverage_path, ".resultset.json.lock")
end

def store_result(result)

Saves the given SimpleCov::Result in the resultset cache 
def store_result(result)
  synchronize_resultset do
    # Ensure we have the latest, in case it was already cached
    clear_resultset
    new_set = resultset
    command_name, data = result.to_hash.first
    new_set[command_name] = data
    File.open(resultset_path, "w+") do |f_|
      f_.puts JSON.pretty_generate(new_set)
    end
  end
  true
end

def stored_data

Returns the contents of the resultset cache as a string or if the file is missing or empty nil 
def stored_data
  synchronize_resultset do
    return unless File.exist?(resultset_path)
    data = File.read(resultset_path)
    return if data.nil? || data.length < 2
    data
  end
end

def synchronize_resultset

given time
Ensure only one process is reading or writing the resultset at any 
def synchronize_resultset
  # make it reentrant
  return yield if defined?(@resultset_locked) && @resultset_locked
  begin
    @resultset_locked = true
    File.open(resultset_writelock, "w+") do |f|
      f.flock(File::LOCK_EX)
      yield
    end
  ensure
    @resultset_locked = false
  end
end