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#!/usr/bin/env ruby
$LOAD_PATH.push File.expand_path("../lib", __dir__)
require "celluloid/autostart"
require "digest/sha2"
class Hasher
include Celluloid
def initialize(secret)
@hash = Digest::SHA2.hexdigest(secret)
end
# Add some data into our hash. This demonstrates a non-trivial computation
# of the same sort as, say, calculating Fibonacci numbers. Since Celluloid
# uses several threads, doing something like this won't grind our entire
# application to a halt
def add(data, n = 100_000)
string = @hash + data
n.times { string = Digest::SHA2.hexdigest(string) }
@hash = string
end
end
# Create the hasher
hasher = Hasher.new("super secret initialization data")
# Ask the hasher to perform a complex computation. However, since we're using
# a future, this doesn't block the current thread
future = hasher.future.add("some data to be hashed")
# We've kicked off the hasher, but this thread can continue performing other
# activities while the hasher runs in the background
puts "The hasher is now running, but this thread is free to do whatever it wants"
# Now let's ask for the return value from the hasher
puts "Getting the hasher's return value... "
p future.value
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