Class: PackerFiles::Utils::FastestURL

Inherits:
Object
  • Object
show all
Defined in:
lib/PackerFiles/Utils/FastestURL.rb

Overview

Given a list of URL, returns the fastest URL (to access) among them. This is done by launching several threads in parallel and estimating the time taken to access the contents of these URLs.

Constant Summary collapse

@@error =

Error URL

25000

Instance Method Summary collapse

Constructor Details

#initialize(slow_limit = 0.5, trials = 1) ⇒ FastestURL

Creates a new object of type FastestURL. slow_limit is used for signalling the response time (in seconds) of a web URL to be categorized as slow. Trials specifies the # of attempts the web URLs must be opened and closed.



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# File 'lib/PackerFiles/Utils/FastestURL.rb', line 22

def initialize(slow_limit = 0.5 , trials = 1)
   @limit  = slow_limit
   @trials = trials
end

Instance Method Details

#best_urls(url_list) ⇒ Object

Returns URLs sorted in terms of best access times from a list of input URLs.



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# File 'lib/PackerFiles/Utils/FastestURL.rb', line 29

def best_urls(url_list)
   threads = url_list.map  { |h| Thread.new {speed_trials(h) }}
   speeds  = threads.map   { |t| t.join; t.value }
   hash    = Hash.new
   url_list.each_with_index do |url, index|
      hash[url] = speeds.at(index) if speeds.at(index) != @@error
   end
   hash.sort_by {|url, speed| speed} 
end