First up, I like making a new Utility Application in XCode for this, because you can plug Jonathan’s code into the showInfo method.  When you run the app in the simulator, just tap the info button to generate the button image.

And as for the button image itself, I recommend setting the height of the image (in CGRectMake) to the exact height of the button you are going to be using, plus 8 pixels due to the empty space around the button image where shaodw live.  If you’re using Interface Builder, check the Size Inspector tab to see what the height of your button is.  Sure, the iPhone SDK will resize your image to fit whatever button size you’re using, but it won’t be pixel perfect.  Also I set the width at 29, as you don’t really need more width than that for making a resizable button image, such as in the following code:

UIImage *blueButtonImage = [[UIImage imageNamed:@"blueButton.png"] stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[myButton setBackgroundImage:blueButtonImage forState:UIControlStateNormal];

For more details on the right Interface Builder settings for custom UIButtons (such as to be sure to pick Custom for button type or you’ll end up with an ugly gray outline), check out Christopher McCulloh’s tutorial.

A nice quote from the article:

“The canned responses included with Snippets are worth its price of $.99 alone, in this blogger’s opinion. But even if you are wittier than I and appreciate original pieces of text, Snippets is a great app with a very easy-to-use interface that I plan to use again and again.”

Thanks, Kevin Harter, for an excellent write-up!

Some people have asked why you would want to use Snippets instead of just the built-in iPhone Notes app…  Well, Snippets has categories, comes with a slew of premade snippets to use for inspiration, and it’s fast because you just have to look at a snippet and it’s automatically copied to the clipboard, instead of doing a double-tap, select button, drag and drag the sliders and then the copy button.  With Snippets it’s 2 taps and you’ve got a snippet copied to the clipboard!  (Not counting launching the app)

Had to hack the javascripts a bit to load everything from the same directory, as the bundle in iPhone apps seems to be flat.  Or it’s flat if you don’t unflatten it, or something.  No biggie.

Mobile Safari likes to have “bouncing” when you scroll past the end of a web page, even a short one, so gotta turn that off.  And gotta turn off the action menu if you hold your finger down.  And a few hacks to get sounds working.  Most of it came from http://www.codingventures.com/?p=31 - thanks fellow iPhone hacker!

Lots of little tweaks to make it feel like a native app, like using the accelerometer for tilt-based aiming.  The animation isn’t the best, due to poor little iPhone’s javascript engine breathing hard, but it’s pretty darn good for what it is.  And fun!

I contacted Steven to see about making a free iPhone app version of his book, and he said to go for it.  I started by looking around for any open source ebook readers I could use as a base.  The best one seemed to be iphonetextreader, but like all the others I could find, it was made back before the SDK was available and used a bunch of unsupported API calls.  I downloaded it and tried to strip out all the unofficial calls, but it wasn’t looking good.

Time to start over.  What was I trying to do?  Get the book onto the iPhone.  Stanza is a free ebook reader on the iPhone, but their catalogs of ebooks aren’t open for adding new items.  Yes, you can find a somewhat hidden place to download from a URL, but typing in a URL by hand, and from memory (no copy & paste on the iPhone), um, blows.

But hey!  Stanza, having been made by some smart folks, has a protocol handler for doing direct downloads!  All you need to do is make a stanza:// link to a “.epub” version of the book and it will fire up Stanza (assuming you click the link on your iPhone) and install it!  Sweet!  It took a few tries to get a reasonable looking epub version (I didn’t much like calibre, Stanza Desktop did alright for conversion) and that was it.

So that’s the punchline, click here if you are on an iPhone and have Stanza installed, and enjoy some Firefly goodness.  Steven will have it up on his website soon, too.

“The binary you uploaded was invalid. The signature was invalid, or it was not signed with an Apple submission certificate.”

Okay, in one case, it was actually valid, as I had been using an icon file that wasn’t named Icon.png and wasn’t 57×57.  Thanks to Sean for helping me with that.

But today, it was totally bogus.  I made a trivial change for a resubmit of my PrivateWeb app, and the binary was rejected.  Clean the project & rebuild, still hosed.  Restart XCode, still hosed.  Go to the finder and remove every folder from my project’s build directory and then build again – and it WORKED???  WTF?!

Ahem.  I’m glad it worked, but seriously…  There’s something buggy in XCode land.

30 Second Massage is now in the AppStore.  It’s not searchable yet, but the direct link to it works.  Game on!

The takeaway, go get an updated JDBC driver, now!  Even if you’re running against Oracle 9i or 10g for the database, the new driver will give you a performance boost.  For free!

I wanted something that was open-ended, and that kids could just play with.  What sprang to mind was how all kids seem to endlessly ask grownups to build towers out of wooden blocks so that they can smash them down using cars or their hands or whatnot.  So that’s what we built.  A toy where it’s easy to create towers of blocks and watch them tumble if they’re not balanced, and then easy to throw shiny balls at the blocks to knock them off the table and off the screen.

Get it from the AppStore – $1.99

Notes from my big run with it…

nohup time ~bratton/jdk1.6.0_06/bin/java -d64 -XX:+UseConcMarkSweepGC -Xmx13000m -Xms13000m -cp . egb.MTNIOStats 40 128 /wf1/data/logs/O.all > nohup.30T.128k.out &

real 15:33.9
user 6:02:50.9
sys 8:36.0

Let’s see…

UseConcMarkSweepGC is a good thing. UseParallelGC sounds like it would be good with lots of cores, but it kept killing the VM about 70% through.

I went with a gigantomous heap, just because I don’t really need it all, but as the queues get bigger, it’s nice to have. It probably would run fine with much, much less.

Java6 does much better than Java5. I’m using a locally-installed version since the /usr version wasn’t working. You need to unpack the 32bit sparc9 binaries first, then unpack the 64bit binaries on top of that. Have to use -d64 to get a heap bigger than 3G.

The -server JIT flag didn’t make any difference in processing time for me.

Interestingly, NIO block read size didn’t matter that much from 32k up to 4M, and neither did the number of threads, whether 25, 30, 35, 40, 50, 60, or even 90. Wacky! Not too much overhead in terms of context switching…

My app design has a single thread doing all the IO, simple reads, and then it hands the ByteBuffers to a separate blocking queue for each worker thread, to avoid any lock overhead. I think that’s probably irrelevant now, and that locking would be nanoseconds, so maybe I’ll redesign it, but it works fine.

My biggest problem is that my worker threads are for the most part waiting on IO to get more data to process. And the reduce phase at the end is not very long, 64 seconds, and it’s actually single threaded for now because shrinking 64 seconds to 64/5 seconds isn’t going to drop me from 15 minutes to 7 minutes

And okay, my results are off by .01% or something, but I haven’t re-run since I updated my parser to handle spaces in URLs. Close enough for me, not close enough for some other WF2ers. It all depends on your business domain what your accuracy needs to be.

MTNIOStats.java – file name capitalization may be munged – thanks WordPress!

Data corruption… Over the past year, I have been using Derby as an embedded database inside of Fubario. I’ve been running it on Windows2000, WindowsXP, and OSX 10.4. On all of these OSes, some are laptops, some are desktop machines on all the time, I’ve had varied data corruption scenarios occur, even under relatively little load.

I will admit, I haven’t done a good job keeping records of each kind of data corruption, probably because of foolish optimism that when a big point release of Derby came out it would have solved the problems with the prior version. But alas, every release has had various things go wrong. I’ve had entire databases corrupt so that Derby would refuse to startup, or even an interesting “poison table” corruption where everything was fine until I issue a query against a particular table that was corrupt, at which point Derby went out to lunch.

And when I say little load, I mean pretty much the databases were idling 24×7, with maybe a few thousand rows in them. And to think that I switched to Derby specifically to get more reliability than I had been having with hsqldb or its shiny new cousin h2…

So where am I now? I’ve built a custom flat-file store for Fubario for storing encrypted backup files. It’s pretty simple, really, with a few key characteristics of secret sauce that make it perfect for Fubario and it’s really tiny in terms of amount of code, because it doesn’t have to do very much at all. I’m also using h2 again for storing maybe tens of properties or something like that, miniscule really, probably could use properties in a flat file, but I’m just reusing the sql-driven classes that had been talking to Derby.

I’m done with the 20 second startup and shutdown times.

I’m done with these random and varied and all peculiar data corruption scenarios.

I’m done with foolish optimism? Maybe.