Rockstar Programmer - Latest Comments

Re: RockStarProgrammer - Git Tag Does the Wrong Thing by Default

bthomson — Wed, 02 Sep 2009 11:28:49 -0000

Thanks dustin. I will stick with the branch and tag -a then.

Re: RockStarProgrammer - Hacking the Django Admin UI: Hiding Rows

Vlada Macek — Wed, 02 Sep 2009 09:05:36 -0000

This approach is discouraged. See http://www.b-list.org/weblog/2008/dec/24/admin/ for proper solution.

Re: RockStarProgrammer - Git Tag Does the Wrong Thing by Default

dlsspy — Wed, 02 Sep 2009 00:56:30 -0000

tag without the -a creates something closer to a branch. It's a kind of bookmark you can use to name a particular revision somewhat informally.

Personally, I don't have much of a use for it. I use branches when I want branches, and tags when I want tags.

Re: RockStarProgrammer - Git Tag Does the Wrong Thing by Default

bthomson — Tue, 01 Sep 2009 22:52:57 -0000

I get that tag -a is the right command to use for getting describe et al to work, but I'm still having trouble figuring out what is the use-case for tag without the -a. The man page doesn't help much either :(

Re: RockStarProgrammer - Stack Overflow is a Time Machine

Daniel — Thu, 13 Aug 2009 16:53:23 -0000

I think the bulk of the problem is new users are trolling for reputation points and so will flock to answer easy questions in hopes of upvotes and are much too scared of loosing reputation with a potential downvote on a harder question.

(That and people whoring for reputation and badges by posting random meaningless questions flood out your questions).

Re: RockStarProgrammer - The Differences Between Mercurial and Git

Samuel — Wed, 20 May 2009 18:53:31 -0000

Users who remain with Mercurial will want to use bitbucket.org, which in my opinion, is one of the best software hosting services ever.

Re: RockStarProgrammer - Good, Fast, Cheap? Eh, No Thanks

colocation — Mon, 27 Apr 2009 07:08:10 -0000

Interesting, I am sure people think loads of servers = bigger business despite the cost and the lack of need for them!

Re: RockStarProgrammer - What Matters in an Asynchronous Job Queue

Stu — Sun, 26 Apr 2009 11:50:39 -0000

Great post. It is stunning how many problems can be solved with a queue, and you hit the key points.

Re: RockStarProgrammer - What's Up? — An XMPP-based Web Monitor

web reader — Mon, 23 Mar 2009 13:27:00 -0000

this comment window is here even if i dont want it - i am unable to see contents of the page i am looking on

http://www.rockstarprogrammer.org/post/2008/jul...

Re: RockStarProgrammer - Git Tag Does the Wrong Thing by Default

Stuart Hughes — Mon, 02 Mar 2009 12:59:38 -0000

Thanks, that helped me out a lot.

Re: RockStarProgrammer - What Matters in an Asynchronous Job Queue

dlsspy — Sat, 21 Feb 2009 00:26:15 -0000

I've not actually used SQS, but from looking in the documentation, it seems that getting a job isn't blocking. I use beanstalkd in places where I need low-latency, so I either have to poll really fast, or ignore my latency requirements.

beanstalkd currently does everything I need and it's quite simple. One file, only libevent as a dependency, and it's currently using less than half a meg of RAM on my box.

Re: RockStarProgrammer - What Matters in an Asynchronous Job Queue

Alex Kane — Fri, 20 Feb 2009 22:52:41 -0000

Use rabbitmq with an ACK or amazon sqs and you'll get what your looking for

Re: RockStarProgrammer - The Differences Between Mercurial and Git

poko — Thu, 01 Jan 2009 08:33:18 -0000

mercurial (v1.1) introduced rebase and git-like local branch support:

http://www.selenic.com/mercurial/wiki/index.cgi...

http://www.selenic.com/mercurial/wiki/index.cgi...

Re: RockStarProgrammer - Stack Overflow is a Time Machine

dlsspy — Sat, 27 Dec 2008 15:34:26 -0000

Yes, I saw it there, and I think I saw the boolean one there, too. They were somewhat popular before that.

Certainly nothing wrong with newbie questions, but if you look at what's most popular over there -- it's that.

But the recommendations of subversion *everywhere* blow my mind. Just last night I saw another one where a guy was recommending subversion to someone because it makes branching so easy. Seriously? Compared to what?

Re: RockStarProgrammer - Stack Overflow is a Time Machine

Calvin Spealman — Sat, 27 Dec 2008 10:41:31 -0000

The array question got on the reddit programming front page, hence the high views.

Re: RockStarProgrammer - Java Singletons Without Locks

dlsspy — Tue, 23 Dec 2008 12:53:41 -0000

Right, so you need to check first.

Consider if the contained object is a thread -- you'll want to try to avoid spinning up a new one, but if you do, you'll nee to tear it down before returning.

In that case, it's get + check + construct + CAS + check + shutdown on race.

Re: RockStarProgrammer - Java Singletons Without Locks

foobar-fred — Tue, 23 Dec 2008 11:32:59 -0000

Drat, the big problem with this implementation is that it instantiats the Singleton class everytime getInstance() is called. No good. Too simple to work.

Re: RockStarProgrammer - Java Singletons Without Locks

foobar-fred — Tue, 23 Dec 2008 11:16:06 -0000

Here is a simplified version. It is too bad that compareAndSet() does not return the new value, but all the same, it may work. Note how getInstance() is not synchronized, but it should be OK if multiple threads are running throught it, I think:

public class Singleton {
private Singleton() {}

private static AtomicReference<Singleton> instance=
new AtomicReference<Singleton>();

public final static Singleton getInstance() {
instance.compareAndSet(null, new Singleton());
return instance.get();
}
}

Re: RockStarProgrammer - Java Singletons Without Locks

dlsspy — Mon, 22 Dec 2008 19:09:57 -0000

I haven't looked at this code in a while. There's at least too much synchronization in it.

I think the fundamental difference between mine and yours is that I try to avoid constructing an object unnecessarily. Just using atomics, it should be easy to do it without ever synchronizing, though.

Re: RockStarProgrammer - Java Singletons Without Locks

foobar-fred — Mon, 22 Dec 2008 18:41:25 -0000

Can you simplify the singleton thus:

import java.util.concurrent.atomic.AtomicReference;
import java.util.Date;

public class Singleton {
public Date d = new Date();
private Singleton() {}

private static AtomicReference<Singleton> instance=
new AtomicReference<Singleton>();

public final static Singleton getInstance() {
instance.compareAndSet(null, new Singleton());
return instance.get();
}

public static void main(String[] args) {
PropsSingleton p = PropsSingleton.getInstance();
System.out.println ("d = " + p.d);
}
}

Re: RockStarProgrammer - The Differences Between Mercurial and Git

Thomas — Thu, 11 Dec 2008 16:51:31 -0000

That depends on how you use it. If you already pushed your comits, rebase against another branch and push it again you've just done it. You will have to force the push though, this is a safety measure.

Re: RockStarProgrammer - Realtime Data with ZK

abhi — Tue, 09 Dec 2008 07:13:49 -0000

how to make grid editable

Re: RockStarProgrammer - The Differences Between Mercurial and Git

AlexMikhalev — Sun, 30 Nov 2008 16:29:39 -0000

May be useful for you - I was looking for github for mercurial and found this
http://www.bitbucket.org/

Re: RockStarProgrammer - Git Tag Does the Wrong Thing by Default

John McCaffrey — Thu, 20 Nov 2008 13:57:21 -0000

thanks, you just saved me some time. I was about to do it the wrong way.

Re: RockStarProgrammer - What Matters in an Asynchronous Job Queue

dlsspy — Wed, 12 Nov 2008 00:14:07 -0000

It's certainly worth talking about.

I'd hate to think about what would have to happen on the inside of memcached to get it performing blocking operations and multiple states of of an item (available, checked out) and automatically changing states based on client events (disconnect -> available), though.

Some of it is certainly backend, but there's a lot of front-end work required to make that work.