Class: EventMachine::HttpFetcher::RequestPool

Inherits:
Object
  • Object
show all
Defined in:
lib/em/http-fetcher/fetcher.rb

Instance Method Summary collapse

Constructor Details

#initialize(total_size, host_resource_size, host_reuse_wait = 0, opts = {}) ⇒ RequestPool

Returns a new instance of RequestPool.



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# File 'lib/em/http-fetcher/fetcher.rb', line 23

def initialize(total_size, host_resource_size, host_reuse_wait = 0, opts = {})
  super()
  @total_size         = total_size
  @host_reuse_wait    = host_reuse_wait
  @host_resource_size = host_resource_size

  @total_queue        = EM::Queue.new
  total_size.times { @total_queue.push true }
  @host_pools         = Hash.new {|h, k|
    pool = EM::Pool.new
    def pool.add item
      super
      @removed.delete item
    end
    host_resource_size.times {
      pool.add EM::HttpRequest.new(k)
    }
    h[k] = { pool: pool, last_used: Time.now }
  }
  run
end

Instance Method Details

#perform(host, &b) ⇒ Object 



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# File 'lib/em/http-fetcher/fetcher.rb', line 45

def perform(host, &b)
  @host_pools[host][:pool].perform do |conn|
    df = nil
    @total_queue.pop do |tqi|
      @host_pools[host][:last_used] = Time.now
      @host_pools[host][:pool].remove conn
      rq = proc { |req|
        @total_queue.push tqi
        lurl = req.last_effective_url
        unless "#{lurl.scheme}://#{lurl.host}" == host
          # Connection has been redirected another server.
          # Re-create connection instance.
          conn = EM::HttpRequest.new(host)
        end

        if @host_reuse_wait > 0
          EM.add_timer(@host_reuse_wait) {
            @host_pools[host][:pool].add conn
          }
        else
          @host_pools[host][:pool].add conn
        end
      }
      work = EM::Callback(&b)
      df = work.call(conn)
      df.callback(&rq)
      df.errback(&rq)
      df
    end
    df
  end
end

#run ⇒ Object 



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# File 'lib/em/http-fetcher/fetcher.rb', line 78

def run
  # cleanup host pool timer
  EM.add_periodic_timer(10) do
    hrsize = @host_resource_size
    @host_pools.each do |host, info|
      info[:pool].instance_eval { @resources.size < hrsize } and next
      info[:last_used].to_i > Time.now.to_i - 5 * 60 and next
      @host_pools.delete host
    end
  end
end