Class: ConcurrentIterable::Iterator

Inherits:
Object
  • Object
show all
Defined in:
lib/concurrent_iterable/iterator.rb

Instance Method Summary collapse

Constructor Details

#initialize(iterable, concurrency: ConcurrentIterable.config.concurrency) ⇒ Iterator

Returns a new instance of Iterator.



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# File 'lib/concurrent_iterable/iterator.rb', line 5

def initialize(iterable, concurrency: ConcurrentIterable.config.concurrency)
  @iterable = iterable
  @concurrency = concurrency
  @executor = Concurrent::FixedThreadPool.new(concurrency)
end

Instance Method Details

#all?(&block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/concurrent_iterable/iterator.rb', line 66

def all?(&block)
  missing = false
  iterable.each_slice(concurrency).each.with_index do |group, group_index|
    results = Concurrent::Array.new(group.length)
    group.length.times.map do |index|
      Concurrent::Promises.future(executor) do
        results[index] = yield group[index]
      end
    end.each(&:wait!)
    if results.index { |result| !result }
      missing = true
      break
    end
  end
  !missing
end

#any?(&block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/concurrent_iterable/iterator.rb', line 83

def any?(&block)
  found = false
  iterable.each_slice(concurrency).each.with_index do |group, group_index|
    results = Concurrent::Array.new(group.length)
    group.length.times.map do |index|
      Concurrent::Promises.future(executor) do
        results[index] = yield group[index]
      end
    end.each(&:wait!)
    if results.index(&:itself)
      found = true
      break
    end
  end
  found
end

#detect(&block) ⇒ Object 



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# File 'lib/concurrent_iterable/iterator.rb', line 32

def detect(&block)
  result = nil
  iterable.each_slice(concurrency).each.with_index do |group, group_index|
    results = Concurrent::Array.new(group.length)
    group.length.times.map do |index|
      Concurrent::Promises.future(executor) do
        results[index] = yield group[index]
      end
    end.each(&:wait!)
    found_index = results.index(&:itself)
    if found_index
      result = iterable[group_index * concurrency + found_index]
      break
    end
  end
  result
end

#each(&block) ⇒ Object 



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# File 'lib/concurrent_iterable/iterator.rb', line 11

def each(&block)
  iterable.each_slice(concurrency).each do |group|
    group.length.times.map do |index|
      Concurrent::Promises.future(executor) { yield group[index] }
    end.each(&:wait!)
  end
end

#map(&block) ⇒ Object 



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# File 'lib/concurrent_iterable/iterator.rb', line 19

def map(&block)
  result = Concurrent::Array.new(iterable.length)
  iterable.each_slice(concurrency).each.with_index do |group, group_index|
    group.length.times.map do |index|
      Concurrent::Promises.future(executor) do
        result_index = group_index * concurrency + index
        result[result_index] = yield group[index]
      end
    end.each(&:wait!)
  end
  result
end

#select(&block) ⇒ Object 



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# File 'lib/concurrent_iterable/iterator.rb', line 50

def select(&block)
  results = []
  iterable.each_slice(concurrency).each do |group|
    group_evals = Concurrent::Array.new(group.length)
    group.length.times.map do |index|
      Concurrent::Promises.future(executor) do
        group_evals[index] = yield group[index]
      end
    end.each(&:wait!)
    group_evals.each.with_index do |eval, index|
      results << group[index] if eval
    end
  end
  results
end