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require 'singleton' | |
class AtMost | |
include Singleton | |
def initialize | |
@table = Hash.new { |h, k| h[k] = -1 } | |
end | |
def call(n) | |
key = caller(1, 2) | |
yield if (@table[key] = (@table[key] + 1) % n).zero? | |
end | |
def self.call(n) | |
instance.call(n) { yield } | |
end | |
end | |
class Throttle | |
include Singleton | |
def initialize | |
@table = Hash.new { |h, k| h[k] = Time.at(0) } | |
end | |
def call(delay) | |
key = caller(1, 2) | |
was = @table[key] | |
now = Time.now | |
if now - was >= delay | |
@table[key] = now | |
yield | |
end | |
end | |
def self.call(n) | |
instance.call(n) { yield } | |
end | |
end | |
require 'logger' | |
logger = Logger.new($stdout) | |
logger.info "Testing AtMost" | |
1000.times do # should print "foo" 10 times and "bar" 10 times | |
AtMost.call(100) { logger.info "foo" } | |
AtMost.call(100) { logger.info "bar" } | |
end | |
logger.info "Testing Throttle" | |
30.times do # should print "foo" ~ 3 times | |
Throttle.call(1) { logger.info "foo" } | |
sleep(0.1) | |
end |
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