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require 'algebrick' # => true
# 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 # => Protocol(Add | Subtract)
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')
# => #<Concurrent::Actor::Reference:0x7fbedba52d90 /calculator (Calculator)>
addition = calculator.ask Add[1, 2]
# => <#Concurrent::Promises::Future:0x7fbedc05f7b0 pending>
subtraction = calculator.ask Subtract[1, 0.5]
# => <#Concurrent::Promises::Future:0x7fbedd891388 pending>
results = (addition & subtraction)
# => <#Concurrent::Promises::Future:0x7fbedc04eeb0 pending>
results.value! # => [3, 0.5]
calculator.ask! :terminate! # => true
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