What is the point/purpose of Ruby EventMachine, Python Twisted, or JavaScript Node.js?

Posted by CCw on Stack Overflow See other posts from Stack Overflow or by CCw
Published on 2010-05-29T03:08:45Z Indexed on 2010/05/29 3:12 UTC
Read the original article Hit count: 274

Filed under:

twisted

|

nonblocking

|

node.js

|

eventmachine

I don't understand what problem these frameworks solve. Are they replacements for a HTTP server like Apache HTTPD, Tomcat, Mongrel, etc? Or are they more? Why might I use them... some real world examples? I've seen endless examples of chat rooms and broadcast services, but don't see how this is any different than, for instance, setting up a Java program to open sockets and dispatch a thread for each request.

I think I understand the non-blocking I/O, but I don't understand how that is any different than a multi-threaded web server.

© Stack Overflow or respective owner

Related posts about twisted

Has Twisted changed its dependencies?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I'm currently working on a Python/Twisted project which is to be distributed and tested on Planetlab. For some reason my code was working on friday and now that I wanted to test a minor change it refuses to work at all: Traceback (most recent call last): File "acn_a4/src/node.py", line… >>> More
Python (Twisted) - reading from fifo and sending read data to multiple protocols

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, Im trying to write some kind of multi protocol bot (jabber/irc) that would read messages from fifo file (one liners mostly) and then send them to irc channel and jabber contacts. So far, I managed to create two factories to connect to jabber and irc, and they seem to be working. However, I've… >>> More
Start Python from Twisted

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I have learnt Python for about a month as a one year's PHPer.And I started from Twisted as I'm working in a corporation supplying webservice.I have finished some simple application such as data transferring service,page images-fetch service etc.But the problem is ,I don't understand the struture… >>> More
How to step through debug twisted?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'd like to be able to debug Punjab, a twisted python application, in Netbeans so that I can step through the code. How can I do that? Alternatively, how could I do it in a different debugger? >>> More
Python twisted Reactor class

as seen on Stack Overflow - Search for 'Stack Overflow'
What is the significance of the decorators @reactor.callWhenRunning, @results_deferred.addCallback @results_deferred.addErrback. Also what are deferred strings, for example in the twisted.internet.utils.getProcessOutput() returns a deferred string what exactly is happening here? I am new… >>> More

Related posts about nonblocking

Python: nonblocking read from stdout of threaded subprocess

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a script (worker.py) that prints unbuffered output in the form... 1 2 3 . . . n where n is some constant number of iterations a loop in this script will make. In another script (service_controller.py) I start a number of threads, each of which starts a subprocess using subprocess.Popen(stdout=subprocess… >>> More
Nonblocking Tcp server

as seen on Stack Overflow - Search for 'Stack Overflow'
It's not a question really, i'm just looking for some guidelines :) I'm currently writing some abstract tcp server which should use as low number of threads as it can. Currently it works this way. I have a thread doing listening and some worker threads. Listener thread is just sits and wait for… >>> More
python: nonblocking subprocess, check stdout

as seen on Stack Overflow - Search for 'Stack Overflow'
Ok so the problem I'm trying to solve is this: I need to run a program with some flags set, check on its progress and report back to a server. So I need my script to avoid blocking while the program executes, but I also need to be able to read the output. Unfortunately, I don't think any of the… >>> More
recv with MSG_NONBLOCK and MSG_WAITALL

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello I want to use recv syscall with nonblocking flags MSG_NONBLOCK. But with this flag syscall can return before full request is satisfied. So, can I add MSG_WAITALL flag? Will it be nonblocking? or how should I rewrite blocking recv into the loop with nonblocking recv >>> More
Nonblocking texture upload on iPhone and other OpenGL ES platforms

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I am doing some work which involves drawing video frames in real time in OpenGL ES. Right now I am using glTexImage2D to transfer the data, in the absence of Pixel Buffer Objects and the like. A below answer suggests that glTexImage2D is always blocking, even if texture object referenced… >>> More