制作多个HTTP请求异步

问题描述：

require 'net/http'

urls = [
  {'link' => 'http://www.google.com/'},
  {'link' => 'http://www.yandex.ru/'},
  {'link' => 'http://www.baidu.com/'}
]

urls.each do |u|
  u['content'] = Net::HTTP.get( URI.parse(u['link']) )
end

print urls

这code工作在同步风格。第一个要求，第二，第三。我想异步发送的所有请求，并打印网址后，所有的人就完成了。

This code works in synchronous style. First request, second, third. I would like to send all requests asynchronously and print urls after all of them is done.

什么是最好的方式做到这一点？光纤是适合的？

What the best way to do it? Is Fiber suited for that?

答

下面是使用线程的例子。

Here's an example using threads.

require 'net/http'

urls = [
  {'link' => 'http://www.google.com/'},
  {'link' => 'http://www.yandex.ru/'},
  {'link' => 'http://www.baidu.com/'}
]

urls.each do |u|
  Thread.new do
    u['content'] = Net::HTTP.get( URI.parse(u['link']) )
    puts "Successfully requested #{u['link']}"

    if urls.all? {|u| u.has_key?("content") }
      puts "Fetched all urls!"
      exit
    end
  end
end

sleep

制作多个HTTP请求异步

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