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#!/usr/bin/env ruby
$: << File.expand_path('../../../lib', __FILE__)
require 'concurrent-edge'
require 'time'
Channel = Concurrent::Channel
## Go by Example: Rate Limiting
# https://gobyexample.com/rate-limiting
requests = Channel.new(buffer: :buffered, capacity: 5)
(1..5).each do |i|
requests << i
end
requests.close
limiter = Channel.ticker(0.2)
requests.each do |req|
print "request #{req} #{Channel::Tick.new}\n" if ~limiter
end
print "\n"
bursty_limiter = Channel.new(buffer: :buffered, capacity: 3)
(1..3).each do
bursty_limiter << Channel::Tick.new
end
ticker = Channel.ticker(0.2)
Channel.go do
ticker.each do |t|
bursty_limiter << t
end
end
bursty_requests = Channel.new(buffer: :buffered, capacity: 5)
(1..5).each do |i|
bursty_requests << i
end
bursty_requests.close
bursty_requests.each do |req|
~bursty_limiter
print "request #{req} #{Channel::Tick.new}\n"
end
limiter.close
ticker.close
__END__
request 1 2012-10-19 00:38:18.687438 +0000 UTC
request 2 2012-10-19 00:38:18.887471 +0000 UTC
request 3 2012-10-19 00:38:19.087238 +0000 UTC
request 4 2012-10-19 00:38:19.287338 +0000 UTC
request 5 2012-10-19 00:38:19.487331 +0000 UTC
request 1 2012-10-19 00:38:20.487578 +0000 UTC
request 2 2012-10-19 00:38:20.487645 +0000 UTC
request 3 2012-10-19 00:38:20.487676 +0000 UTC
request 4 2012-10-19 00:38:20.687483 +0000 UTC
request 5 2012-10-19 00:38:20.887542 +0000 UTC
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