Class: Concurrent::Promises::Event

Inherits:
AbstractEventFuture
  • Object
show all
Defined in:
lib/concurrent-ruby/concurrent/promises.rb

Overview

Represents an event which will happen in future (will be resolved). The event is either pending or resolved. It should be always resolved. Use Future to communicate rejections and cancellation.

Direct Known Subclasses

ResolvableEvent

Instance Method Summary collapse

Methods inherited from AbstractEventFuture

#chain, #chain_on, #chain_resolvable, #default_executor, #internal_state, #on_resolution, #on_resolution!, #on_resolution_using, #pending?, #resolved?, #state, #to_s, #touch, #wait

Instance Method Details

#any(event_or_future) ⇒ Event Also known as: |

Creates a new event which will be resolved when the first of receiver, event_or_future resolves.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 843

def any(event_or_future)
  AnyResolvedEventPromise.new_blocked_by2(self, event_or_future, @DefaultExecutor).event
end

#delay ⇒ Event

Creates new event dependent on receiver which will not evaluate until touched, see AbstractEventFuture#touch. In other words, it inserts delay into the chain of Futures making rest of it lazy evaluated.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 853

def delay
  event = DelayPromise.new(@DefaultExecutor).event
  ZipEventEventPromise.new_blocked_by2(self, event, @DefaultExecutor).event
end

#schedule(intended_time) ⇒ Event

Creates new event dependent on receiver scheduled to execute on/in intended_time. In time is interpreted from the moment the receiver is resolved, therefore it inserts delay into the chain.

Parameters:

  • intended_time (Numeric, Time) —

    Numeric means to run in intended_time seconds. Time means to run on intended_time.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 865

def schedule(intended_time)
  chain do
    event = ScheduledPromise.new(@DefaultExecutor, intended_time).event
    ZipEventEventPromise.new_blocked_by2(self, event, @DefaultExecutor).event
  end.flat_event
end

#to_event ⇒ Event

Returns self, since this is event

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 883

def to_event
  self
end

#to_future ⇒ Future

Converts event to a future. The future is fulfilled when the event is resolved, the future may never fail.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 875

def to_future
  future = Promises.resolvable_future
ensure
  chain_resolvable(future)
end

#with_default_executor(executor) ⇒ Event

Crates new object with same class with the executor set as its new default executor. Any futures depending on it will use the new default executor.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 889

def with_default_executor(executor)
  EventWrapperPromise.new_blocked_by1(self, executor).event
end

#zip(other) ⇒ Future, Event Also known as: &

Creates a new event or a future which will be resolved when receiver and other are. Returns an event if receiver and other are events, otherwise returns a future. If just one of the parties is Future then the result of the returned future is equal to the result of the supplied future. If both are futures then the result is as described in FactoryMethods#zip_futures_on.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 829

def zip(other)
  if other.is_a?(Future)
    ZipFutureEventPromise.new_blocked_by2(other, self, @DefaultExecutor).future
  else
    ZipEventEventPromise.new_blocked_by2(self, other, @DefaultExecutor).event
  end
end