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require 'typhoeus/hydra/addable'
require 'typhoeus/hydra/before'
require 'typhoeus/hydra/cacheable'
require 'typhoeus/hydra/block_connection'
require 'typhoeus/hydra/memoizable'
require 'typhoeus/hydra/queueable'
require 'typhoeus/hydra/runnable'
require 'typhoeus/hydra/stubbable'
module Typhoeus
# Hydra manages making parallel HTTP requests. This
# is achieved by using libcurls multi interface:
# http://curl.haxx.se/libcurl/c/libcurl-multi.html
# The benefits are that you don't have to worry running
# the requests by yourself.
#
# Hydra will also handle how many requests you can
# make in parallel. Things will get flakey if you
# try to make too many requests at the same time.
# The built in limit is 200. When more requests than
# that are queued up, hydra will save them for later
# and start the requests as others are finished. You
# can raise or lower the concurrency limit through
# the Hydra constructor.
#
# Regarding the asynchronous behavior of the hydra,
# it is important to know that this is completely hidden
# from the developer and you are free to apply
# whatever technique you want to your code. That should not
# conflict with libcurls internal concurrency mechanism.
#
# @example Use the hydra to do multiple requests.
# hydra = Typhoeus::Hydra.new
# requests = (0..9).map{ Typhoeus::Request.new("www.example.com") }
# requests.each{ |request| hydra.queue(request) }
# hydra.run
#
# @note Callbacks are going to delay the request
# execution.
class Hydra
include Hydra::Addable
include Hydra::Runnable
include Hydra::Memoizable
include Hydra::Cacheable
include Hydra::BlockConnection
include Hydra::Stubbable
include Hydra::Before
include Hydra::Queueable
# @example Set max_concurrency.
# Typhoeus::Hydra.new(max_concurrency: 20)
attr_accessor :max_concurrency
# @api private
attr_reader :multi
class << self
# Returns a memoized hydra instance.
#
# @example Get a hydra.
# Typhoeus::Hydra.hydra
#
# @return [Typhoeus::Hydra] A new hydra.
def hydra
Thread.current[:typhoeus_hydra] ||= new
end
end
# Create a new hydra. All
# {http://rubydoc.info/github/typhoeus/ethon/Ethon/Multi#initialize-instance_method Ethon::Multi#initialize}
# options are also available.
#
# @example Create a hydra.
# Typhoeus::Hydra.new
#
# @example Create a hydra with max_concurrency.
# Typhoeus::Hydra.new(max_concurrency: 20)
#
# @param [ Hash ] options The options hash.
#
# @option options :max_concurrency [ Integer ] Number
# of max concurrent connections to create. Default is
# 200.
#
# @see http://rubydoc.info/github/typhoeus/ethon/Ethon/Multi#initialize-instance_method
# Ethon::Multi#initialize
def initialize(options = {})
@options = options
@max_concurrency = Integer(@options.fetch(:max_concurrency, 200))
@multi = Ethon::Multi.new(options.reject{|k,_| k==:max_concurrency})
end
end
end
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