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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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