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#!/usr/bin/env rackup -s thin
#
# async_app.ru
# raggi/thin
#
# A second demo app for async rack + thin app processing!
# Now using http status code 100 instead.
#
# Created by James Tucker on 2008-06-17.
# Copyright 2008 James Tucker <raggi@rubyforge.org>.
#
#--
# Benchmark Results:
#
# raggi@mbk:~$ ab -c 100 -n 500 http://127.0.0.1:3000/
# This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
# Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
# Copyright 2006 The Apache Software Foundation, http://www.apache.org/
#
# Benchmarking 127.0.0.1 (be patient)
# Completed 100 requests
# Completed 200 requests
# Completed 300 requests
# Completed 400 requests
# Finished 500 requests
#
#
# Server Software: thin
# Server Hostname: 127.0.0.1
# Server Port: 3000
#
# Document Path: /
# Document Length: 12 bytes
#
# Concurrency Level: 100
# Time taken for tests: 5.263089 seconds
# Complete requests: 500
# Failed requests: 0
# Write errors: 0
# Total transferred: 47000 bytes
# HTML transferred: 6000 bytes
# Requests per second: 95.00 [#/sec] (mean)
# Time per request: 1052.618 [ms] (mean)
# Time per request: 10.526 [ms] (mean, across all concurrent requests)
# Transfer rate: 8.55 [Kbytes/sec] received
#
# Connection Times (ms)
# min mean[+/-sd] median max
# Connect: 0 3 2.2 3 8
# Processing: 1042 1046 3.1 1046 1053
# Waiting: 1037 1042 3.6 1041 1050
# Total: 1045 1049 3.1 1049 1057
#
# Percentage of the requests served within a certain time (ms)
# 50% 1049
# 66% 1051
# 75% 1053
# 80% 1053
# 90% 1054
# 95% 1054
# 98% 1056
# 99% 1057
# 100% 1057 (longest request)
class DeferrableBody
include EventMachine::Deferrable
def call(body)
body.each do |chunk|
@body_callback.call(chunk)
end
end
def each &blk
@body_callback = blk
end
end
class AsyncApp
# This is a template async response. N.B. Can't use string for body on 1.9
AsyncResponse = [-1, {}, []].freeze
def call(env)
body = DeferrableBody.new
# Get the headers out there asap, let the client know we're alive...
EventMachine::next_tick { env['async.callback'].call [200, {'Content-Type' => 'text/plain'}, body] }
# Semi-emulate a long db request, instead of a timer, in reality we'd be
# waiting for the response data. Whilst this happens, other connections
# can be serviced.
# This could be any callback based thing though, a deferrable waiting on
# IO data, a db request, an http request, an smtp send, whatever.
EventMachine::add_timer(1) {
body.call ["Woah, async!\n"]
EventMachine::next_tick {
# This could actually happen any time, you could spawn off to new
# threads, pause as a good looking lady walks by, whatever.
# Just shows off how we can defer chunks of data in the body, you can
# even call this many times.
body.call ["Cheers then!"]
body.succeed
}
}
# throw :async # Still works for supporting non-async frameworks...
AsyncResponse # May end up in Rack :-)
end
end
# The additions to env for async.connection and async.callback absolutely
# destroy the speed of the request if Lint is doing it's checks on env.
# It is also important to note that an async response will not pass through
# any further middleware, as the async response notification has been passed
# right up to the webserver, and the callback goes directly there too.
# Middleware could possibly catch :async, and also provide a different
# async.connection and async.callback.
# use Rack::Lint
run AsyncApp.new
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