Comments on: EventMachine Examples http://www.mikeperham.com/2009/11/02/eventmachine-examples/ On Ruby, software and the Internet Tue, 03 Jan 2012 09:53:56 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Chris http://www.mikeperham.com/2009/11/02/eventmachine-examples/comment-page-1/#comment-1210 Chris Tue, 26 Jul 2011 19:45:58 +0000 http://www.mikeperham.com/?p=382#comment-1210 Having similar problems learning EventMachine.. All the tutorials/examples out there are irrelevant to objects/variables/databases beyond the loop construct. Worse yet there are many that setup echo server 'examples' without an example client with which to pass data... So far I've tried 5 different EM "server" examples that demonstrate no qualities beyond a simple ruby loop. As if that weren't enough, one of the first examples google returns is a script containing characters that ruby cannot interpret. Finally, all of the connection-based examples on blocking loops is todo with (and requires) HTTP, whereas a simple 'sleep 10' or '100000**100000' would have sufficed. Chris is angry. Having similar problems learning EventMachine.. All the tutorials/examples out there are irrelevant to objects/variables/databases beyond the loop construct. Worse yet there are many that setup echo server ‘examples’ without an example client with which to pass data… So far I’ve tried 5 different EM “server” examples that demonstrate no qualities beyond a simple ruby loop. As if that weren’t enough, one of the first examples google returns is a script containing characters that ruby cannot interpret. Finally, all of the connection-based examples on blocking loops is todo with (and requires) HTTP, whereas a simple ‘sleep 10′ or ’100000**100000′ would have sufficed.

Chris is angry.

]]> By: Chad http://www.mikeperham.com/2009/11/02/eventmachine-examples/comment-page-1/#comment-464 Chad Mon, 08 Feb 2010 03:13:39 +0000 http://www.mikeperham.com/?p=382#comment-464 Mike, I'm working on my own EventMachine based server (http://github.com/chadrem/officer). I'm just wondering if you have stumbled across any EventMachine based testing tools since writing this. Mike, I’m working on my own EventMachine based server (http://github.com/chadrem/officer). I’m just wondering if you have stumbled across any EventMachine based testing tools since writing this.

]]> By: Mars http://www.mikeperham.com/2009/11/02/eventmachine-examples/comment-page-1/#comment-442 Mars Tue, 03 Nov 2009 15:51:39 +0000 http://www.mikeperham.com/?p=382#comment-442 I had a similarly challenging go with EventMachine at Scout Labs. It's an amazing piece of work. The trick was understanding: - the main EventMachine.run block's never-exit behavior; to see exceptions, you have to rescue, EventMachine.stop_event_loop, & raise - that the main run block must return so that events can be processed; I use ProcessChannel.subscribe & push to generate the async calls from the run block - how to act like a loop inside that main block, since it must return; at the end of each iteration I use EventMachine::Timer to schedule the next iteration - how to track & limit outstanding events so that my service doesn't run out of control *Mars I had a similarly challenging go with EventMachine at Scout Labs. It’s an amazing piece of work.

The trick was understanding:

- the main EventMachine.run block’s never-exit behavior; to see exceptions, you have to rescue, EventMachine.stop_event_loop, & raise

- that the main run block must return so that events can be processed; I use ProcessChannel.subscribe & push to generate the async calls from the run block

- how to act like a loop inside that main block, since it must return; at the end of each iteration I use EventMachine::Timer to schedule the next iteration

- how to track & limit outstanding events so that my service doesn’t run out of control

*Mars

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