Class: Fontisan::Variation::ParallelGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/fontisan/variation/parallel_generator.rb

Overview

Generates multiple font instances in parallel

Uses thread pool for efficient batch processing with caching. Supports progress tracking and graceful error handling per instance.

Examples:

Basic batch generation

generator = ParallelGenerator.new(font)
coordinates_list = [
  { "wght" => 300 },
  { "wght" => 700 }
]
instances = generator.generate_batch(coordinates_list)

With progress callback

generator.generate_batch(coordinates_list) do |index, total|
  puts "Generated #{index}/#{total}"
end

Custom thread count

generator = ParallelGenerator.new(font, threads: 8)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(font, options = {}) ⇒ ParallelGenerator

Initialize parallel generator

Parameters:

Options Hash (options):

  • :cache (ThreadSafeCache) —

    Cache instance (creates new if not provided)

  • :threads (Integer) —

    Thread count (default: max(4, processor_count))



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# File 'lib/fontisan/variation/parallel_generator.rb', line 46

def initialize(font, options = {})
  @font = font
  @cache = options[:cache] || ThreadSafeCache.new
  @thread_count = options[:threads] || [4, Etc.nprocessors].max
end

Instance Attribute Details

#cache ⇒ ThreadSafeCache (readonly)

Returns Thread-safe cache.

Returns:



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# File 'lib/fontisan/variation/parallel_generator.rb', line 35

def cache
  @cache
end

#font ⇒ TrueTypeFont, OpenTypeFont (readonly)

Returns Variable font.

Returns:



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# File 'lib/fontisan/variation/parallel_generator.rb', line 32

def font
  @font
end

#thread_count ⇒ Integer (readonly)

Returns Number of threads.

Returns:

  • (Integer) —

    Number of threads



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# File 'lib/fontisan/variation/parallel_generator.rb', line 38

def thread_count
  @thread_count
end

Instance Method Details

#generate_batch(coordinates_list) {|index, total| ... } ⇒ Array<Hash>

Generate multiple instances in parallel

Processes each coordinate set in parallel using thread pool. Returns results in same order as input coordinates.

Parameters:

  • coordinates_list (Array<Hash>) —

    List of coordinate sets

Yields:

  • (index, total) —

    Progress callback (optional)

Yield Parameters:

  • index (Integer) —

    Current completed count

  • total (Integer) —

    Total count

Returns:

  • (Array<Hash>) —

    Generated instances with metadata



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# File 'lib/fontisan/variation/parallel_generator.rb', line 62

def generate_batch(coordinates_list, &progress_callback)
  return [] if coordinates_list.empty?

  total = coordinates_list.length
  results = Array.new(total)
  completed = 0
  mutex = Mutex.new

  # Create thread pool
  pool = Fontisan::Utils::ThreadPool.new(@thread_count)

  # Schedule all jobs
  futures = coordinates_list.map.with_index do |coordinates, index|
    pool.schedule do
      {
        index: index,
        result: generate_with_cache(coordinates),
      }
    end
  end

  # Collect results
  futures.each do |future|
    job_result = future.value
    results[job_result[:index]] = job_result[:result]

    # Update progress
    if progress_callback
      mutex.synchronize do
        completed += 1
        yield(completed, total)
      end
    end
  end

  # Shutdown pool
  pool.shutdown

  results
end

#generate_with_cache(coordinates) ⇒ Hash

Generate instance with caching

Uses cache to avoid regenerating identical instances.

Parameters:

  • coordinates (Hash<String, Float>) —

    Design space coordinates

Returns:

  • (Hash) —

    Instance data with metadata



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# File 'lib/fontisan/variation/parallel_generator.rb', line 109

def generate_with_cache(coordinates)
  font_checksum = calculate_font_checksum

  begin
    tables = @cache.fetch_instance(font_checksum, coordinates) do
      generator = InstanceGenerator.new(@font, coordinates)
      generator.generate
    end

    {
      success: true,
      coordinates: coordinates,
      tables: tables,
      error: nil,
    }
  rescue StandardError => e
    {
      success: false,
      coordinates: coordinates,
      tables: nil,
      error: {
        message: e.message,
        class: e.class.name,
        backtrace: e.backtrace&.first(5),
      },
    }
  end
end