Class: Dry::Effects::Providers::Defer

Inherits:
Object
  • Object
show all
Defined in:
lib/dry/effects/providers/defer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#later_calls ⇒ Object (readonly)

Returns the value of attribute later_calls.



13
14
15
 
# File 'lib/dry/effects/providers/defer.rb', line 13

def later_calls
  @later_calls
end

#stack ⇒ Object (readonly)

Returns the value of attribute stack.



15
16
17
 
# File 'lib/dry/effects/providers/defer.rb', line 15

def stack
  @stack
end

Instance Method Details

#call(options = {executor: Undefined}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Yield the block with the handler installed



52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/dry/effects/providers/defer.rb', line 52

def call(options = {executor: Undefined})
  unless Undefined.equal?(options[:executor])
    @executor = options[:executor]
  end

  @stack = Frame.stack
  @later_calls = []
  yield
ensure
  later_calls.each(&:execute)
end

#defer(block, executor) ⇒ Object 



17
18
19
20
21
22
23
 
# File 'lib/dry/effects/providers/defer.rb', line 17

def defer(block, executor)
  stack = self.stack.dup
  at = Undefined.default(executor, self.executor)
  ::Concurrent::Promise.execute(executor: at) do
    Frame.spawn_fiber(stack, &block)
  end
end

#dup ⇒ Object 



64
65
66
67
68
69
70
 
# File 'lib/dry/effects/providers/defer.rb', line 64

def dup
  if defined? @later_calls
    super.tap { _1.instance_variable_set(:@later_calls, EMPTY_ARRAY) }
  else
    super
  end
end

#later(block, executor) ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/dry/effects/providers/defer.rb', line 25

def later(block, executor)
  if @later_calls.frozen?
    Instructions.Raise(Errors::EffectRejectedError.new(<<~MSG))
      .later calls are not allowed, they would be processed
      by another stack. Add another defer handler to the current stack
    MSG
  else
    at = Undefined.default(executor, self.executor)
    stack = self.stack.dup
    @later_calls << ::Concurrent::Promise.new(executor: at) do
      Frame.spawn_fiber(stack, &block)
    end
    nil
  end
end

#represent ⇒ String

Returns:

  • (String) 


74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/dry/effects/providers/defer.rb', line 74

def represent
  info = []
  info << executor.to_s if executor.is_a?(::Symbol)
  info << "call_later=#{later_calls.size}" if later_calls.any?

  if info.empty?
    "defer"
  else
    "defer[#{info.join(" ")}]"
  end
end

#wait(promises) ⇒ Object 



41
42
43
44
45
46
47
 
# File 'lib/dry/effects/providers/defer.rb', line 41

def wait(promises)
  if promises.is_a?(::Array)
    ::Concurrent::Promise.zip(*promises).value!
  else
    promises.value!
  end
end