[ajug-members] convert program

[Wilson, Jeff]

As a generalization, I think the difference between most programs that
can benefit from an OO approach versus those that don't, is state. If
you have to manage more than trivial state in your app, OO may help it.
If you're just doing algorithms, OO won't help.


+jeff (MJW)
---

"Love is a snowmobile racing across the tundra and then suddenly it
flips over, pinning you underneath. At night, the ice weasels come."
    -- M. Groening

---------------------------------------------
M. Jeff Wilson, Lead Member Technical Staff
AT&T Services, Inc.
Operations & Service Dev
jw9615 at att.com 
+1 404.499.7235

-----Original Message-----
From: Chris Fowler [mailto:cfowler at outpostsentinel.com] 
Sent: Friday, September 19, 2008 7:41 PM
To: ajug-members at ajug.org
Subject: Re: [ajug-members] convert program

Wilson, Jeff wrote:
>
> If you're just doing algorithmic work, you may not need OOP. I took a 
> look at the tow pond code you sent me last week, and there's really no

> reason to have an object at all for that. But that's not really Java. 
> To get any advantages of an OO language, you're problem space needs to

> be a little more complex than that.
>

Correct, the problem does not lend itself to OOP.

I had a problem today that would fit well. I am looking for a Linux 
programmer with network programming experience.

I got a resume and decided that to really know how much UNIX and network

programming this person could do, I would device a short test.

The test I created was to write a network server that users could telnet

to and chat. Program could be written in 30 minutes or less in Perl or C

only.

to prove it could be done, I started and completed in about 20 minutes 
with interruptions from AIM, email and desk phone. It worked but with 10

minutes more one could add logging and IP address header to all messages

so we know who is talking.

I asked one of my engineers to telnet to my desktop to test it and he 
commented that he would like to see a nick instead of an address. I 
stated that I simply used getpeername() on the socket to get the address

and all I stored was an array of sockets. To really do something like 
that I would need to store more information about the client.

So this is where OOP would work. I need to create an object for each 
client that includes the socket, mode, and possibly even a chat room 
name. As I'm processing messages from clients I can then use that 
information to route messages correctly.

Here is some pseudo/java code :)
public class client {
private Socket _sock = null;
private int mode = 0;
public client(Socket sock)
this._sock = sock;
mode = 1; // Not in room yet
}

public string get_Address() {
return peername;
}

public void write(String txt) throws Exception {
write socket;
}

....
}

Anyway. In my test, to get it done fast, I programmed in Perl. Perl 
supports OOP so I can easily create objects just for the clients.

An array of file descriptors was perfect until I decided the program
needed
to be extended. For the 30 minute test, objects and complexity like this

would
take too long.

> +jeff (MJW)
>
> ---
>
> "Without question, the greatest invention in the history of mankind is

> beer. The wheel does not go nearly as well with pizza."
>
> -- Dave Barry
>
> ---------------------------------------------
>
> M. Jeff Wilson, Lead Member Technical Staff
>
> AT&T Services, Inc.
>
> Operations & Service Dev
>
> jw9615 at att.com
>
> +1 404.499.7235
>
> *From:* 521 [mailto:521 at ofig.org]
> *Sent:* Friday, September 19, 2008 3:52 PM
> *To:* ajug-members at ajug.org
> *Subject:* [ajug-members] convert program
>
> i want to use oop correctly...
>
> i want to take input as a csv of doubles named heights, 
> 1.3,3.4,7.6,8.2,5.3,3.2,0.32
>
> then take another csv of doubles named distances, 
> 0.0,25.2,50.1,75.3,100.1,125.5,150.3
>
> do some math (get some areas/volumes/etc);
>
> then give back an area/volume/etc
>
> in order for me to not just use static-methods from various classes; 
> how can i program this using oop; a user here last week or so told me 
> that Java is not made this way; and i understand why he said that... 
> (here is the php version i made years ago: *http://tinyurl.com/4bnt4a*
>
> barclay
>
>
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>
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> ajug-members at ajug.org
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>   


-- 
Chris Fowler
OutPost Sentinel, LLC
Support @ SIP/support at pbx.opsdc.com
 or 678-804-8193
Email Support @ support at outpostsentinel.com



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