Rails - Aug 2006 - off topic: running non-ruby programs through command line

Hi all,

Slightly OT, but is there any way to run command-line programs through Ruby?
I have a rails web application that performs some database work. After a
certain action is performed, the rails app should then call a java program
that performs additional work to our mainframe. This is under Win 2003
Server.

Any ideas?

Thanks,
Jin Lee
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On Tue, 2006-08-08 at 10:26 -0700, Jin Lee wrote:
> Hi all,
> 
> Slightly OT, but is there any way to run command-line programs through
> Ruby? I have a rails web application that performs some database work.
> After a certain action is performed, the rails app should then call a
> java program that performs additional work to our mainframe. This is
> under Win 2003 Server. 
You can probably use

system(...)

see Kernel.system for docs. Or backticks

`java -jar whatever.jar`

bye
John

I think %x{ command } does this

-- 
Posted via http://www.ruby-forum.com/.

Hi.
It''s not a good idea, IMHO, to call an external app on a http session.
You will hang your session unless you work with threads / forks.

A good way is:
 
- Drop a file on a directory with all parameters you need.
- Create an robot that reads the directory from time to time and calls your java
app with parameters is file.
-- Before calling the java app is good to move the dropped file to avoid getting
the same file several times.

This is ok if you need it asynchronous.

[]''s
Romeu Fonseca

-----Mensagem original-----
De: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] Em nome de Jin Lee
Enviada em: ter?a-feira, 8 de agosto de 2006 13:26
Para: rails@lists.rubyonrails.org
Assunto: [Rails] off topic: running non-ruby programs through command line

Hi all,

Slightly OT, but is there any way to run command-line programs through Ruby? I
have a rails web application that performs some database work. After a certain
action is performed, the rails app should then call a java program that performs
additional work to our mainframe. This is under Win 2003 Server.

Any ideas?

Thanks,
Jin Lee
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2006/8/8, Romeu Henrique Capparelli Fonseca
<rfonseca@fpf.br>:
>
> Hi.
> It''s not a good idea, IMHO, to call an external app on a http
session. You
> will hang your session unless you work with threads / forks.
>
> A good way is:
>
> - Drop a file on a directory with all parameters you need.
> - Create an robot that reads the directory from time to time and calls
> your java app with parameters is file.
> -- Before calling the java app is good to move the dropped file to avoid
> getting the same file several times.

another way: use the backgrounDRb plugin. so you can even make cron-like
things, status reporting back to the app, etc
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A while ago I used Open3.popen3 (because I needed stdout and stderr) to
execute some commands on a vms system through rsh.
Since this functionality is only used occasionally (in an internal app),
working with threads and implementing callback etc would have been
overkill imho.
 
Piet.

	-----Original Message-----
	From: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Michael
Siebert
	Sent: woensdag 9 augustus 2006 8:36
	To: rails@lists.rubyonrails.org
	Subject: Re: [Rails] off topic: running non-ruby programs
through command line
	
	


	2006/8/8, Romeu Henrique Capparelli Fonseca <rfonseca@fpf.br>: 

		Hi.
		It''s not a good idea, IMHO, to call an external app on a
http session. You will hang your session unless you work with threads /
forks. 
		
		A good way is:
		
		- Drop a file on a directory with all parameters you
need.
		- Create an robot that reads the directory from time to
time and calls your java app with parameters is file.
		-- Before calling the java app is good to move the
dropped file to avoid getting the same file several times. 

	 
	another way: use the backgrounDRb plugin. so you can even make
cron-like things, status reporting back to the app, etc

	 

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