Class: Concurrent::Promises::AbstractEventFuture

Inherits:
Synchronization::Object
  • Object
show all
Includes:
ThrottleIntegration
Defined in:
lib/concurrent/edge/promises.rb,
lib/concurrent/edge/throttle.rb

Overview

Common ancestor of Event and Future classes, many shared methods are defined here.

Direct Known Subclasses

Event, Future

Defined Under Namespace

Modules: ThrottleIntegration

Instance Method Summary collapse

Methods included from ThrottleIntegration

#chain_throttled_by, #throttled_by

Instance Method Details

#add_callback_notify_blocked(promise, index) ⇒ Object

# @!visibility private



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# File 'lib/concurrent/edge/promises.rb', line 742

def add_callback_notify_blocked(promise, index)
  add_callback :callback_notify_blocked, promise, index
end

#chain(*args, &task) ⇒ Future

Shortcut of #chain_on with default ‘:io` executor supplied.

Returns:

See Also:



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# File 'lib/concurrent/edge/promises.rb', line 605

def chain(*args, &task)
  chain_on @DefaultExecutor, *args, &task
end

#an_event.chain_on(executor, *args) {|*args| ... } ⇒ Future #a_future.chain_on(executor, *args) {|fulfilled, value, reason, *args| ... } ⇒ Future

Chains the task to be executed asynchronously on executor after it is resolved.

Overloads:

  • #an_event.chain_on(executor, *args) {|*args| ... } ⇒ Future

    Yields:

    • (*args) —

      to the task.

  • #a_future.chain_on(executor, *args) {|fulfilled, value, reason, *args| ... } ⇒ Future

    Yields:

    • (fulfilled, value, reason, *args) —

      to the task.

    Yield Parameters:

    • fulfilled (true, false)
    • value (Object)
    • reason (Exception)

Parameters:

  • executor (Executor, :io, :fast) —

    Instance of an executor or a name of the global executor. The task is executed on it, default executor remains unchanged.

  • args (Object) —

    arguments which are passed to the task when it’s executed. (It might be prepended with other arguments, see the @yeild section).

Yield Returns:

  • will become result of the returned Future. Its returned value becomes Future#value fulfilling it, raised exception becomes Future#reason rejecting it.

Returns:



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# File 'lib/concurrent/edge/promises.rb', line 623

def chain_on(executor, *args, &task)
  ChainPromise.new_blocked_by1(self, @DefaultExecutor, executor, args, &task).future
end

#chain_resolvable(resolvable) ⇒ self Also known as: tangle

Resolves the resolvable when receiver is resolved.

Parameters:

Returns:

  • (self) 


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# File 'lib/concurrent/edge/promises.rb', line 638

def chain_resolvable(resolvable)
  on_resolution! { resolvable.resolve_with internal_state }
end

#default_executor ⇒ Executor

Returns default executor.

Returns:

  • (Executor) —

    default executor

See Also:



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# File 'lib/concurrent/edge/promises.rb', line 599

def default_executor
  @DefaultExecutor
end

#on_resolution(*args, &callback) ⇒ self

Shortcut of #on_resolution_using with default ‘:io` executor supplied.

Returns:

  • (self)

See Also:



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# File 'lib/concurrent/edge/promises.rb', line 646

def on_resolution(*args, &callback)
  on_resolution_using @DefaultExecutor, *args, &callback
end

#an_event.on_resolution!(*args) {|*args| ... } ⇒ self #a_future.on_resolution!(*args) {|fulfilled, value, reason, *args| ... } ⇒ self

Stores the callback to be executed synchronously on resolving thread after it is resolved.

Overloads:

  • #an_event.on_resolution!(*args) {|*args| ... } ⇒ self

    Yields:

    • (*args) —

      to the callback.

  • #a_future.on_resolution!(*args) {|fulfilled, value, reason, *args| ... } ⇒ self

    Yields:

    • (fulfilled, value, reason, *args) —

      to the callback.

    Yield Parameters:

    • fulfilled (true, false)
    • value (Object)
    • reason (Exception)

Parameters:

  • args (Object) —

    arguments which are passed to the task when it’s executed. (It might be prepended with other arguments, see the @yeild section).

Yield Returns:

  • is forgotten.

Returns:

  • (self) 


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# File 'lib/concurrent/edge/promises.rb', line 664

def on_resolution!(*args, &callback)
  add_callback :callback_on_resolution, args, callback
end

#an_event.on_resolution_using(executor, *args) {|*args| ... } ⇒ self #a_future.on_resolution_using(executor, *args) {|fulfilled, value, reason, *args| ... } ⇒ self

Stores the callback to be executed asynchronously on executor after it is resolved.

Overloads:

  • #an_event.on_resolution_using(executor, *args) {|*args| ... } ⇒ self

    Yields:

    • (*args) —

      to the callback.

  • #a_future.on_resolution_using(executor, *args) {|fulfilled, value, reason, *args| ... } ⇒ self

    Yields:

    • (fulfilled, value, reason, *args) —

      to the callback.

    Yield Parameters:

    • fulfilled (true, false)
    • value (Object)
    • reason (Exception)

Parameters:

  • executor (Executor, :io, :fast) —

    Instance of an executor or a name of the global executor. The task is executed on it, default executor remains unchanged.

  • args (Object) —

    arguments which are passed to the task when it’s executed. (It might be prepended with other arguments, see the @yeild section).

Yield Returns:

  • is forgotten.

Returns:

  • (self) 


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# File 'lib/concurrent/edge/promises.rb', line 682

def on_resolution_using(executor, *args, &callback)
  add_callback :async_callback_on_resolution, executor, args, callback
end

#pending?(state = internal_state) ⇒ Boolean

Is it in pending state?

Returns:

  • (Boolean) 


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# File 'lib/concurrent/edge/promises.rb', line 558

def pending?(state = internal_state)
  !state.resolved?
end

#resolved?(state = internal_state) ⇒ Boolean

Is it in resolved state?

Returns:

  • (Boolean) 


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# File 'lib/concurrent/edge/promises.rb', line 564

def resolved?(state = internal_state)
  state.resolved?
end

#an_event.state ⇒ :pending, :resolved #a_future.state ⇒ :pending, ...

Returns its state.

Overloads:

  • #an_event.state ⇒ :pending, :resolved

    Returns:

    • (:pending, :resolved)
  • #a_future.state ⇒ :pending, ...

    Both :fulfilled, :rejected implies :resolved.

    Returns:

    • (:pending, :fulfilled, :rejected)

Returns:

  • (Symbol) 


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# File 'lib/concurrent/edge/promises.rb', line 552

def state
  internal_state.to_sym
end

#to_s ⇒ String Also known as: inspect

Returns Short string representation.

Returns:

  • (String) —

    Short string representation.



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# File 'lib/concurrent/edge/promises.rb', line 628

def to_s
  format '<#%s:0x%x %s>', self.class, object_id << 1, state
end

#touch ⇒ self

Propagates touch. Requests all the delayed futures, which it depends on, to be executed. This method is called by any other method requiring resolved state, like #wait.

Returns:

  • (self) 


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# File 'lib/concurrent/edge/promises.rb', line 571

def touch
  @Promise.touch
  self
end

#wait(timeout = nil) ⇒ Future, ...

Note:

This function potentially blocks current thread until the Future is resolved. Be careful it can deadlock. Try to chain instead.

Wait (block the Thread) until receiver is #resolved?. Calls #touch.

Parameters:

  • timeout (Numeric) (defaults to: nil) —

    the maximum time in second to wait.

Returns:

  • (Future, true, false) —

    self implies timeout was not used, true implies timeout was used and it was resolved, false implies it was not resolved within timeout.



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# File 'lib/concurrent/edge/promises.rb', line 587

def wait(timeout = nil)
  result = wait_until_resolved(timeout)
  timeout ? result : self
end

#with_default_executor(executor) ⇒ AbstractEventFuture

This method is abstract.

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:

Raises:

  • (NotImplementedError)

See Also:



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# File 'lib/concurrent/edge/promises.rb', line 692

def with_default_executor(executor)
  raise NotImplementedError
end