Class: Concurrent::Promises::ResolvableFuture

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

Overview

A Future which can be resolved by user.

Instance Method Summary collapse

Methods inherited from Future

#any, #delay, #exception, #flat_event, #flat_future, #fulfilled?, #on_fulfillment, #on_fulfillment!, #on_fulfillment_using, #on_rejection, #on_rejection!, #on_rejection_using, #rejected?, #rescue, #rescue_on, #run, #schedule, #then, #then_on, #to_event, #to_future, #to_s, #with_default_executor, #zip

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, #with_default_executor

Instance Method Details

#evaluate_to(*args) {|*args| ... } ⇒ self

Evaluates the block and sets its result as future’s value fulfilling, if the block raises an exception the future rejects with it.

Yields:

  • (*args) —

    to the block.

Yield Returns:

  • (Object) —

    value

Returns:

  • (self) 


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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1395

def evaluate_to(*args, &block)
  promise.evaluate_to(*args, block)
end

#evaluate_to!(*args) {|*args| ... } ⇒ self

Evaluates the block and sets its result as future’s value fulfilling, if the block raises an exception the future rejects with it.

Yields:

  • (*args) —

    to the block.

Yield Returns:

  • (Object) —

    value

Returns:

  • (self)

Raises:

  • (Exception) —

    also raise reason on rejection.



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1406

def evaluate_to!(*args, &block)
  promise.evaluate_to(*args, block).wait!
end

#fulfill(value, raise_on_reassign = true, reserved = false) ⇒ self, false

Makes the future fulfilled with ‘value`, which triggers all dependent futures.

Parameters:

  • value (Object)
  • raise_on_reassign (Boolean) (defaults to: true) —

    should method raise exception if already resolved

  • reserved (true, false) (defaults to: false) —

    Set to true if the resolvable is #reserved by you, marks resolution of reserved resolvable events and futures explicitly. Advanced feature, ignore unless you use Resolvable#reserve from edge.

Returns:

  • (self, false) —

    false is returned when raise_on_reassign is false and the receiver is already resolved.



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1375

def fulfill(value, raise_on_reassign = true, reserved = false)
  resolve_with Fulfilled.new(value), raise_on_reassign, reserved
end

#reason(timeout = nil, timeout_value = nil, resolve_on_timeout = nil) ⇒ Exception, ...

Behaves as Future#reason but has one additional optional argument resolve_on_timeout.

Parameters:

  • resolve_on_timeout (::Array(true, Object, nil), ::Array(false, nil, Exception), nil) (defaults to: nil) —

    If it times out and the argument is not nil it will also resolve the future to the provided resolution.

Returns:

  • (Exception, timeout_value, nil)

See Also:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1503

def reason(timeout = nil, timeout_value = nil, resolve_on_timeout = nil)
  if wait_until_resolved timeout
    internal_state.reason
  else
    if resolve_on_timeout
      unless resolve(*resolve_on_timeout, false)
        # if it fails to resolve it was resolved in the meantime
        # so return value as if there was no timeout
        return internal_state.reason
      end
    end
    timeout_value
  end
end

#reject(reason, raise_on_reassign = true, reserved = false) ⇒ self, false

Makes the future rejected with ‘reason`, which triggers all dependent futures.

Parameters:

  • reason (Object)
  • raise_on_reassign (Boolean) (defaults to: true) —

    should method raise exception if already resolved

  • reserved (true, false) (defaults to: false) —

    Set to true if the resolvable is #reserved by you, marks resolution of reserved resolvable events and futures explicitly. Advanced feature, ignore unless you use Resolvable#reserve from edge.

Returns:

  • (self, false) —

    false is returned when raise_on_reassign is false and the receiver is already resolved.



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1385

def reject(reason, raise_on_reassign = true, reserved = false)
  resolve_with Rejected.new(reason), raise_on_reassign, reserved
end

#resolve(fulfilled = true, value = nil, reason = nil, raise_on_reassign = true, reserved = false) ⇒ self, false

Makes the future resolved with result of triplet ‘fulfilled?`, `value`, `reason`, which triggers all dependent futures.

Parameters:

  • fulfilled (true, false) (defaults to: true)
  • value (Object) (defaults to: nil)
  • reason (Object) (defaults to: nil)
  • raise_on_reassign (Boolean) (defaults to: true) —

    should method raise exception if already resolved

  • reserved (true, false) (defaults to: false) —

    Set to true if the resolvable is #reserved by you, marks resolution of reserved resolvable events and futures explicitly. Advanced feature, ignore unless you use Resolvable#reserve from edge.

Returns:

  • (self, false) —

    false is returned when raise_on_reassign is false and the receiver is already resolved.



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1365

def resolve(fulfilled = true, value = nil, reason = nil, raise_on_reassign = true, reserved = false)
  resolve_with(fulfilled ? Fulfilled.new(value) : Rejected.new(reason), raise_on_reassign, reserved)
end

#result(timeout = nil, resolve_on_timeout = nil) ⇒ ::Array(Boolean, Object, Exception)?

Behaves as Future#result but has one additional optional argument resolve_on_timeout.

Parameters:

  • resolve_on_timeout (::Array(true, Object, nil), ::Array(false, nil, Exception), nil) (defaults to: nil) —

    If it times out and the argument is not nil it will also resolve the future to the provided resolution.

Returns:

  • (::Array(Boolean, Object, Exception), nil)

See Also:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1524

def result(timeout = nil, resolve_on_timeout = nil)
  if wait_until_resolved timeout
    internal_state.result
  else
    if resolve_on_timeout
      unless resolve(*resolve_on_timeout, false)
        # if it fails to resolve it was resolved in the meantime
        # so return value as if there was no timeout
        internal_state.result
      end
    end
    # otherwise returns nil
  end
end

#value(timeout = nil, timeout_value = nil, resolve_on_timeout = nil) ⇒ Object, ...

Behaves as Future#value but has one additional optional argument resolve_on_timeout.

Parameters:

  • resolve_on_timeout (::Array(true, Object, nil), ::Array(false, nil, Exception), nil) (defaults to: nil) —

    If it times out and the argument is not nil it will also resolve the future to the provided resolution.

Returns:

  • (Object, timeout_value, nil)

See Also:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1459

def value(timeout = nil, timeout_value = nil, resolve_on_timeout = nil)
  if wait_until_resolved timeout
    internal_state.value
  else
    if resolve_on_timeout
      unless resolve(*resolve_on_timeout, false)
        # if it fails to resolve it was resolved in the meantime
        # so return value as if there was no timeout
        return internal_state.value
      end
    end
    timeout_value
  end
end

#value!(timeout = nil, timeout_value = nil, resolve_on_timeout = nil) ⇒ Object, ...

Behaves as Future#value! but has one additional optional argument resolve_on_timeout.

Parameters:

  • resolve_on_timeout (::Array(true, Object, nil), ::Array(false, nil, Exception), nil) (defaults to: nil) —

    If it times out and the argument is not nil it will also resolve the future to the provided resolution.

Returns:

  • (Object, timeout_value, nil)

Raises:

  • (Exception) —

    #reason on rejection

See Also:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1481

def value!(timeout = nil, timeout_value = nil, resolve_on_timeout = nil)
  if wait_until_resolved! timeout
    internal_state.value
  else
    if resolve_on_timeout
      unless resolve(*resolve_on_timeout, false)
        # if it fails to resolve it was resolved in the meantime
        # so return value as if there was no timeout
        raise self if rejected?
        return internal_state.value
      end
    end
    timeout_value
  end
end

#wait(timeout = nil, resolve_on_timeout = nil) ⇒ self, ...

Behaves as AbstractEventFuture#wait but has one additional optional argument resolve_on_timeout.

Parameters:

  • resolve_on_timeout (::Array(true, Object, nil), ::Array(false, nil, Exception), nil) (defaults to: nil) —

    If it times out and the argument is not nil it will also resolve the future to the provided resolution.

Returns:

  • (self, true, false)

See Also:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1421

def wait(timeout = nil, resolve_on_timeout = nil)
  super(timeout) or if resolve_on_timeout
                      # if it fails to resolve it was resolved in the meantime
                      # so return true as if there was no timeout
                      !resolve(*resolve_on_timeout, false)
                    else
                      false
                    end
end

#wait!(timeout = nil, resolve_on_timeout = nil) ⇒ self, ...

Behaves as Future#wait! but has one additional optional argument resolve_on_timeout.

Parameters:

  • resolve_on_timeout (::Array(true, Object, nil), ::Array(false, nil, Exception), nil) (defaults to: nil) —

    If it times out and the argument is not nil it will also resolve the future to the provided resolution.

Returns:

  • (self, true, false)

Raises:

  • (Exception) —

    #reason on rejection

See Also:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1438

def wait!(timeout = nil, resolve_on_timeout = nil)
  super(timeout) or if resolve_on_timeout
                      if resolve(*resolve_on_timeout, false)
                        false
                      else
                        # if it fails to resolve it was resolved in the meantime
                        # so return true as if there was no timeout
                        raise self if rejected?
                        true
                      end
                    else
                      false
                    end
end

#with_hidden_resolvable ⇒ Future

Creates new future wrapping receiver, effectively hiding the resolve method and similar.

Returns:



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# File 'lib/concurrent-ruby/concurrent/promises.rb', line 1542

def with_hidden_resolvable
  @with_hidden_resolvable ||= FutureWrapperPromise.new_blocked_by1(self, @DefaultExecutor).future
end