Class: Promise

Inherits:
Object show all
Defined in:
lib/volt/utils/promise_patch.rb

Overview

A temp patch for promises until github.com/opal/opal/pull/725 is released.

Instance Method Summary collapse

Constructor Details

#initialize(success = nil, failure = nil) ⇒ Promise

Returns a new instance of Promise.



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# File 'lib/volt/utils/promise_patch.rb', line 3

def initialize(success = nil, failure = nil)
  @success = success
  @failure = failure

  @realized  = nil
  @exception = false
  @value     = nil
  @error     = nil
  @delayed   = false

  @prev = nil
  @next = nil
end

Instance Method Details

#>>(promise) ⇒ Object 



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# File 'lib/volt/utils/promise_patch.rb', line 18

def >>(promise)
  @next = promise

  if exception?
    promise.reject(@delayed[0])
  elsif resolved?
    promise.resolve(@delayed ? @delayed[0] : value)
  elsif rejected? && (!@failure || Promise === (@delayed ? @delayed[0] : @error))
    promise.reject(@delayed ? @delayed[0] : error)
  end

  self
end

#reject!(value) ⇒ Object 



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# File 'lib/volt/utils/promise_patch.rb', line 40

def reject!(value)
  if @next
    @next.reject(value)
  else
    @delayed = [value]
  end
end

#resolve!(value) ⇒ Object 



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# File 'lib/volt/utils/promise_patch.rb', line 32

def resolve!(value)
  if @next
    @next.resolve(value)
  else
    @delayed = [value]
  end
end

#sync ⇒ Object

Waits for the promise to resolve (assuming it is blocking on the server) and returns the result.



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# File 'lib/volt/utils/promise_patch.rb', line 50

def sync
  result = nil
  error = nil

  self.then do |val|
    result = val
  end.fail do |err|
    error = err
  end

  if error
    raise error
  else
    return result
  end
end