Class: Core::Async::Future

Inherits:
Object
  • Object
show all
Includes:
Is::Inspectable
Defined in:
lib/core/async/future.rb

Overview

public

Represents a future result.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ Future

Returns a new instance of Future.



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# File 'lib/core/async/future.rb', line 17

def initialize(&block)
  @error = nil
  @result = nil
  @status = :pending
  @raised = false
  @fiber = Fiber.schedule { |filament|
    begin
      @filament = filament
      value = block.call
      @result = resolve_value(value)
      @status = :complete
      @result
    rescue Cancel
      @status = :canceled
      nil
    rescue => error
      @error = error
      @status = :failed
      raise error
    end
  }
end

Instance Attribute Details

#status ⇒ Object (readonly)

public

The current status; one of :pending, :failed, :canceled, or :complete.



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# File 'lib/core/async/future.rb', line 42

def status
  @status
end

Instance Method Details

#cancel ⇒ Object

public

Attempt to cancel the future, returning true if successful.



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# File 'lib/core/async/future.rb', line 54

def cancel
  if pending?
    Fiber.scheduler.cancel(@fiber)
  end

  self
end

#canceled? ⇒ Boolean

public

Return ‘true` if canceled.

Returns:

  • (Boolean) 


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# File 'lib/core/async/future.rb', line 160

def canceled?
  @status == :canceled
end

#complete? ⇒ Boolean

public

Return ‘true` if complete.

Returns:

  • (Boolean) 


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# File 'lib/core/async/future.rb', line 166

def complete?
  @status == :complete
end

#error ⇒ Object

public

Return any error that occurred without re-raising, blocking until available.



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# File 'lib/core/async/future.rb', line 135

def error
  @error ||= get_error
end

#failed? ⇒ Boolean

public

Return ‘true` if failed.

Returns:

  • (Boolean) 


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# File 'lib/core/async/future.rb', line 154

def failed?
  @status == :failed
end

#pending? ⇒ Boolean

public

Return ‘true` if pending.

Returns:

  • (Boolean) 


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# File 'lib/core/async/future.rb', line 148

def pending?
  @status == :pending
end

#resolved? ⇒ Boolean

public

Return ‘true` if failed or complete.

Returns:

  • (Boolean) 


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# File 'lib/core/async/future.rb', line 172

def resolved?
  failed? || complete?
end

#result ⇒ Object

public

Wait until the result is available, returning the result. Only awaits explicitly awaited children.



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# File 'lib/core/async/future.rb', line 64

def result
  resolve(false)
end

#wait ⇒ Object

public

Wait on the future to resolve (including children), returning self.



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# File 'lib/core/async/future.rb', line 46

def wait
  resolve

  self
end