Class: Reacto::Trackable

Inherits:
Object
  • Object
show all
Defined in:
lib/reacto/trackable.rb

Constant Summary collapse

TOPICS = 
[:open, :value, :error, :close]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(behaviour = NO_ACTION, executor = nil, &block) ⇒ Trackable

Returns a new instance of Trackable.



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# File 'lib/reacto/trackable.rb', line 168

def initialize(behaviour = NO_ACTION, executor = nil, &block)
  @behaviour = block_given? ? block : behaviour
  @executor = executor
end

Class Method Details

.close(executor = nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 36

def close(executor = nil)
  make(nil, executor) do |subscriber|
    subscriber.on_close
  end
end

.combine(*trackables, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 20

def combine(*trackables, &block)
  combine_create(
    Subscriptions::CombiningSubscription, *trackables, &block
  )
end

.combine_last(*trackables, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 26

def combine_last(*trackables, &block)
  combine_create(
    Subscriptions::CombiningLastSubscription, *trackables, &block
  )
end

.combine_with(function, *trackables) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 153

def combine_with(function, *trackables)
end

.enumerable(enumerable, executor = nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 138

def enumerable(enumerable, executor = nil)
  make(nil, executor) do |tracker|
    begin
      enumerable.each do |val|
        break unless tracker.subscribed?
        tracker.on_value(val)
      end

      tracker.on_close if tracker.subscribed?
    rescue => error
      tracker.on_error(error) if tracker.subscribed?
    end
  end
end

.error(err, executor = nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 42

def error(err, executor = nil)
  make(nil, executor) do |subscriber|
    subscriber.on_error(err)
  end
end

.interval(interval, enumerator = Behaviours.integers_enumerator, executor: nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 68

def interval(
  interval,
  enumerator = Behaviours.integers_enumerator,
  executor: nil
)
  if executor.is_a?(Concurrent::ImmediateExecutor)
    make do |tracker|
      Behaviours.with_close_and_error(tracker) do |subscriber|
        while subscriber.subscribed?
          sleep interval if subscriber.subscribed?
          if subscriber.subscribed?
            begin
              subscriber.on_value(enumerator.next)
            rescue StopIteration
              break
            end
          else
            break
          end
        end
      end
    end
  else
    make do |tracker|
      queue = Queue.new
      task = Concurrent::TimerTask.new(execution_interval: interval) do
        queue.push('ready')
      end

      Thread::abort_on_exception = true
      thread = Thread.new do
        begin
          loop do
            queue.pop
            break unless tracker.subscribed?

            begin
              value = enumerator.next
              tracker.on_value(value)
            rescue StopIteration
              tracker.on_close if tracker.subscribed?
              break
            rescue StandardError => error
              tracker.on_error(error) if tracker.subscribed?
              break
            end
          end
        ensure
          task.shutdown
        end
      end
      task.execute

      tracker.add_resource(Reacto::Resources::ExecutorResource.new(
        task, threads: [thread]
      ))
    end
  end
end

.later(secs, value, executor: Reacto::Executors.tasks) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 53

def later(secs, value, executor: Reacto::Executors.tasks)
  if executor.is_a?(Concurrent::ImmediateExecutor)
    make do |tracker|
      sleep secs
      Behaviours.single_tracker_value(tracker, value)
    end
  else
    make do |tracker|
      Concurrent::ScheduledTask.execute(secs, executor: executor) do
        Behaviours.single_tracker_value(tracker, value)
      end
    end
  end
end

.make(behaviour = NO_ACTION, executor = nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 48

def make(behaviour = NO_ACTION, executor = nil, &block)
  behaviour = block_given? ? block : behaviour
  self.new(behaviour, executor)
end

.never ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 16

def never
  self.new
end

.repeat(array, int: 0.1, executor: nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 128

def repeat(array, int: 0.1, executor: nil)
  interval(
    int, Behaviours.array_repeat_enumerator(array), executor: executor
  )
end

.value(value, executor = nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 134

def value(value, executor = nil)
  make(Behaviours.single_value(value), executor)
end

.zip(*trackables, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 32

def zip(*trackables, &block)
  combine_create(Subscriptions::ZippingSubscription, *trackables, &block)
end

Instance Method Details

#[](x) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 257

def [](x)
  lift(Operations::Drop.new(x, 1))
end

#await(subscription, timeout = nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 302

def await(subscription, timeout = nil)
  latch = Concurrent::CountDownLatch.new(1)
  subscription.add(Subscriptions.on_close_and_error { latch.count_down })
  latch.wait(timeout)
end

#buffer(count: nil, delay: nil) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 277

def buffer(count: nil, delay: nil)
  lift(Operations::Buffer.new(count: count, delay: delay))
end

#cache(type: :memory, **settings) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 289

def cache(type: :memory, **settings)
  settings ||= {}
  lift(Operations::Cache.new(type: type, **settings))
end

#concat(trackable) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 269

def concat(trackable)
  lift(Operations::Concat.new(trackable))
end

#delay(delay) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 281

def delay(delay)
  buffer(delay: delay)
end

#diff(initial = NO_VALUE, fn = Operations::Diff::DEFAULT_FN, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 229

def diff(initial = NO_VALUE, fn = Operations::Diff::DEFAULT_FN, &block)
  lift(Operations::Diff.new(block_given? ? block : fn, initial))
end

#do_track(subscription) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 311

def do_track(subscription)
  if @executor
    @executor.post(subscription, &@behaviour)
  else
    @behaviour.call(subscription)
  end
end

#drop(how_many_to_drop) ⇒ Object Also known as: skip 



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# File 'lib/reacto/trackable.rb', line 233

def drop(how_many_to_drop)
  lift(Operations::Drop.new(how_many_to_drop))
end

#drop_errors ⇒ Object Also known as: skip_errors 



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# File 'lib/reacto/trackable.rb', line 237

def drop_errors
  lift(Operations::DropErrors.new)
end

#execute_on(executor) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 298

def execute_on(executor)
  Trackable.new(@behaviour, executor)
end

#first ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 253

def first
  take(1)
end

#flat_map(transform = nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 207

def flat_map(transform = nil, &block)
  lift(Operations::FlatMap.new(block_given? ? block : transform))
end

#flat_map_latest(transform = nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 211

def flat_map_latest(transform = nil, &block)
  lift(Operations::FlatMapLatest.new(block_given? ? block : transform))
end

#flatten ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 249

def flatten
  lift(Operations::Flatten.new)
end

#inject(initial = NO_VALUE, injector = nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 225

def inject(initial = NO_VALUE, injector = nil, &block)
  lift(Operations::Inject.new(block_given? ? block : injector, initial))
end

#last ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 261

def last
  lift(Operations::Last.new)
end

#lift(operation = nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 195

def lift(operation = nil, &block)
  operation = block_given? ? block : operation
  Trackable.new(nil, @executor) do |tracker_subscription|
    begin
      modified = operation.call(tracker_subscription)
      lift_behaviour(modified) unless modified == NOTHING
    rescue Exception => e
      tracker_subscription.on_error(e)
    end
  end
end

#map(mapping = nil, error: nil, close: nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 215

def map(mapping = nil, error: nil, close: nil, &block)
  lift(Operations::Map.new(
    block_given? ? block : mapping, error: error, close: close
  ))
end

#merge(trackable, delay_error: false) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 273

def merge(trackable, delay_error: false)
  lift(Operations::Merge.new(trackable, delay_error: delay_error))
end

#off(notification_tracker) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 182

def off(notification_tracker)
  # Clean-up logic
end

#on(trackers = {}) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 173

def on(trackers = {})
  unless (trackers.keys - TOPICS).empty?
    raise "This Trackable supports only #{TOPICS}, " \
      "but #{trackers.keys} were passed."
  end

  track(Tracker.new(trackers))
end

#prepend(enumerable) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 265

def prepend(enumerable)
  lift(Operations::Prepend.new(enumerable))
end

#select(filter = nil, &block) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 221

def select(filter = nil, &block)
  lift(Operations::Select.new(block_given? ? block : filter))
end

#take(how_many_to_take) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 241

def take(how_many_to_take)
  lift(Operations::Take.new(how_many_to_take))
end

#throttle(delay) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 285

def throttle(delay)
  lift(Operations::Throttle.new(delay))
end

#track(notification_tracker) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 186

def track(notification_tracker)
  subscription =
    Subscriptions::TrackerSubscription.new(notification_tracker, self)

  do_track(subscription)

  Subscriptions::SubscriptionWrapper.new(subscription)
end

#track_on(executor) ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 294

def track_on(executor)
  lift(Operations::TrackOn.new(executor))
end

#uniq ⇒ Object 



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# File 'lib/reacto/trackable.rb', line 245

def uniq
  lift(Operations::Uniq.new)
end