Lifelog » development

Propel / Pager / Datagrid

snk00sj — Fri, 15 Dec 2006 13:27:56 +0000

Because we are using propel in most of our larger projects, it’s very common we need a datagrid for the listing of the objects. A year ago we made a datagrid with the most important features combined with an ajax approach (sorting, filtering…), for the ajax functionality we wrote our own javascript function calls, what led to alot of unmanageable code, both javascript and php.

As time moved on, this loading of the datagrid became slower and slower (due to increasing objects, about 9000 records with multiple joined tables). This was mainly because the old datagrid first loaded all objects, and then sorted the entire array by the columns as defined by the user….don’t tell me..i know ! This is a bad approach, that means all records get looped, and if you are using propel that would mean for each of those 9000+ records an object is created…that’s crazy…(it has some advantages though)…

So now i finally found some time to do a total rewrite of this datagrid, combined with the power of the propel pager, propel criteria & the php/ajax framework xajax, i came up, faster then expected, with a powerfull scalable datagrid that only loads the visible records. All switchpages, sorting & filters call a corresponding ajax function. These functions change the criteria in the object and reload the datagrid. I’ll elaborate on this later, by showing you some code and perhaps an online example.

Zend Studio Performance

snk00sj — Fri, 08 Dec 2006 13:27:00 +0000

Lately i noticed Zend Studio wasn’t running as smooth as before. When going into hibernate or logging off, i often notice javaw.exe has crashed, that caused the system not to shut down. To fix this problem i’ve found several solutions, i’ll list those here for future reference :

make sure the power settings do not use the option to enable cpu throttling (this seems to be a java issue)
try replacing zends jre by JRE 6 (http://java.sun.com/javase/6/download.jsp)
disable the OS look&feel in your zend application
disable all power management for your video card
if you are using a dual monitor setup, make sure the editor & palettes are on the same monitor/display
remove the Zend Project cache file : /Documents and Settings/{Win username}/ZDE/config_5.1/caches/
expand the heap sizes (to more then 256 MB) the JRE needs for the Studio to function [file: {studiopath}/bin/ZDE.lax]
if you have a 64b machine, make sure you have the 64bit java lib
try disabling your antivirus for a second and check if performance goes up
if you are using an external subversion client (not ZDE’s), make sure your options in ZDE are on CVS. (options > source control). Performance gets a huge boost (integrated svn is causing a problem when using 3th party tools)
submit a support ticket (http://www.zend.com/support) (make sure to mention you tried all t he above steps, and provide as much detail as possible, because they won’t fix your problem untill they have everything they are looking for : hardware, software, ZDE.log, description of the project)

Here’s the info I found posted over at the PhpBuilder.com Zend Studio Forum by MStaniszczak (post is no longer there). This item addresses the speed of the java virtual machine, and for those of us running Intel processors, this tends to be faster than the Sun JRE. If you’ve got an AMD processor, this may or may not yield any performance.

Head on over to BEA Systems and get the JRockit 5.0 JRE. Don’t worry about the SDK, unless you’re a Java programmer. It’s about 30 megs, so dial-up beware. After downloading it, extract the exe (right click, extract archive).

After you’ve done that, you should see some files, as well as another archive or zip file named something like win_ia32_jrockit150_04_jre.zip. You’ll want to extract that as well, to it’s own directory or folder (name it jre) , and that’s going to be what we need.

First, make sure the ZDE is not currently running. If it is, exit it. Now, find your installation of the Zend Studio client. It should be something like C:/Program Files/Zend/ZendStudioClient-5.0.0/. You’ll see a directory already named jre. Rename it to jre_old. Copy the directory we created from the archive into the ZendStudioClient-5.0.0/ directory.

For me the HEAP size, in combination with the source control tab (to cvs) did it, as i am using tortoisesvn for version management.

Another Development Week

snk00sj — Fri, 03 Feb 2006 18:35:33 +0000

At this moment i am managing a project with 3 programmers and a designer. Because of the deadline of the project i had to allocate some extra resources to make sure everything is finished in time.

We are creating a system to analyse “Post Construction Waste” that is being transferred in Europe. To satisfy the need of our customer we designed a [tag]framework[/tag] that uses some of the most recent technologies including ajax, output caching, templating, xml language parsing and more…Because i prefer working with the recent available technologies, we decided to develop the project in php5, mainly because of the new/extended oop features and exception handling.

For version management we use Subversion, on my windows machine powered by TortoiseSVN with some extra scripts to commit/update/export with a simple click of the mouse (or shortcut combination). I noticed this week we crossed revision 700, we passed the cape of 500 programming hours on this project too….Time to move to the next one ?