1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
require 'algebrick'
# Actor message protocol definition with Algebrick
Protocol = Algebrick.type do
variants Add = type { fields! a: Numeric, b: Numeric },
Subtract = type { fields! a: Numeric, b: Numeric }
end
class Calculator < Concurrent::Actor::RestartingContext
include Algebrick::Matching
def on_message(message)
# pattern matching on the message with deconstruction
# ~ marks values which are passed to the block
match message,
(on Add.(~any, ~any) do |a, b|
a + b
end),
# or using multi-assignment
(on ~Subtract do |(a, b)|
a - b
end)
end
end #
calculator = Calculator.spawn('calculator')
addition = calculator.ask Add[1, 2]
subtraction = calculator.ask Subtract[1, 0.5]
results = (addition & subtraction)
results.value!
calculator.ask! :terminate!
|
