Class: IOPromise::CancelContext

Inherits:
Object
  • Object
show all
Defined in:
lib/iopromise/cancel_context.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent) ⇒ CancelContext

Returns a new instance of CancelContext.



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# File 'lib/iopromise/cancel_context.rb', line 34

def initialize(parent)
  parent.subscribe(self) unless parent.nil?
end

Class Method Details

.context_stack ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 6

def context_stack
  Thread.current[:iopromise_context_stack] ||= []
end

.current ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 10

def current
  context_stack.last
end

.pop ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 20

def pop
  ctx = context_stack.pop
  ctx.cancel
  ctx
end

.push ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 14

def push
  new_ctx = CancelContext.new(current)
  context_stack.push(new_ctx)
  new_ctx
end

.with_new_context ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 26

def with_new_context
  ctx = push
  yield ctx
ensure
  pop
end

Instance Method Details

#cancel ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 43

def cancel
  return unless defined?(@observers)
  @observers.each do |o|
    o.cancel
  end
  @observers = []
end

#subscribe(observer) ⇒ Object 



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# File 'lib/iopromise/cancel_context.rb', line 38

def subscribe(observer)
  @observers ||= []
  @observers.push observer
end