Class: top_level_module::DeepCover::Persistence

Inherits:
Object
  • Object
show all
Defined in:
lib/deep_cover/persistence.rb

Constant Summary collapse

BASENAME = 
'coverage.dc'
TRACKER_TEMPLATE = 
'trackers%{unique}.dct'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cache_directory) ⇒ Persistence

Returns a new instance of Persistence.



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# File 'lib/deep_cover/persistence.rb', line 17

def initialize(cache_directory)
  @dir_path = Pathname(cache_directory).expand_path
end

Instance Attribute Details

#dir_path ⇒ Object (readonly)

Returns the value of attribute dir_path.



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# File 'lib/deep_cover/persistence.rb', line 16

def dir_path
  @dir_path
end

Class Method Details

.merge_tracker_hits_per_paths(*tracker_hits_per_path_hashes) ⇒ Object 



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# File 'lib/deep_cover/persistence.rb', line 63

def self.merge_tracker_hits_per_paths(*tracker_hits_per_path_hashes)
  return {} if tracker_hits_per_path_hashes.empty?

  result = tracker_hits_per_path_hashes[0].transform_values(&:dup)

  tracker_hits_per_path_hashes[1..-1].each do |tracker_hits_per_path|
    tracker_hits_per_path.each do |path, tracker_hits|
      matching_result = result[path]
      if matching_result.nil?
        result[path] = tracker_hits.dup
        next
      end

      if matching_result.size != tracker_hits.size
        raise "Attempting to merge trackers of different sizes: #{matching_result.size} vs #{tracker_hits.size}, for path #{path}"
      end

      tracker_hits.each_with_index do |nb_hits, i|
        matching_result[i] += nb_hits
      end
    end
  end

  result
end

Instance Method Details

#clear_directory ⇒ Object 



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# File 'lib/deep_cover/persistence.rb', line 55

def clear_directory
  delete_trackers
  begin
    dir_path.rmdir
  rescue SystemCallError # rubocop:disable Lint/HandleExceptions
  end
end

#delete_trackers ⇒ Object 



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# File 'lib/deep_cover/persistence.rb', line 51

def delete_trackers
  tracker_files.each(&:delete)
end

#load_trackers ⇒ Object

returns a TrackerHitsPerPath



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# File 'lib/deep_cover/persistence.rb', line 32

def load_trackers
  tracker_hits_per_path_hashes = tracker_files.map do |full_path|
    JSON.parse(full_path.binread).transform_keys(&:to_sym).yield_self do |version:, tracker_hits_per_path:|
      raise "dump version mismatch: #{version}, currently #{VERSION}" unless version == VERSION
      tracker_hits_per_path
    end
  end

  self.class.merge_tracker_hits_per_paths(*tracker_hits_per_path_hashes)
end

#merge_persisted_trackers ⇒ Object 



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# File 'lib/deep_cover/persistence.rb', line 43

def merge_persisted_trackers
  tracker_hits_per_path = load_trackers
  return if tracker_hits_per_path.empty?
  tracker_files_before = tracker_files
  save_trackers(tracker_hits_per_path)
  tracker_files_before.each(&:delete)
end

#save_trackers(tracker_hits_per_path) ⇒ Object 



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# File 'lib/deep_cover/persistence.rb', line 21

def save_trackers(tracker_hits_per_path)
  create_directory_if_needed
  basename = format(TRACKER_TEMPLATE, unique: SecureRandom.urlsafe_base64)

  dir_path.join(basename).binwrite(JSON.dump(
                                       version: VERSION,
                                       tracker_hits_per_path: tracker_hits_per_path,
  ))
end