redredred » Development

Memcache lockless queue implementation (v2)

Jonathan — Mon, 08 Feb 2010 23:39:49 +0000

The new Google App Engine 1.3.1 SDK has an added method on memcache called “grab_tail”. This is a great little method that removes the need for my lockless queue to manage the read counter. We still need to manage the write counter though, because there doesn’t seem to be a way to add items to [...]

Money database property for Google App Engine

Jonathan — Thu, 15 Oct 2009 03:44:07 +0000

Calculating money is a tricky thing. Your calculations have to be ultra-precise, so no storing things as floats where $1.33 might actually be stored as 1.3299999999. That is no good for calculations… But equally it is no good storing in cents either: what is 133c /2? Python has a Decimal datatype, but this requires serialisation to [...]

The people around you make the difference

rob — Thu, 23 Jul 2009 03:31:29 +0000

Over at 37signals, Matt blogged on a topic recently that really resonated with me… the gist of what he said being that if a project or company is made up of a whole lot of people who don’t really know each other, individuals are generally going to play it safer than a group of people [...]

Flex Authorize Tag

adam — Fri, 22 May 2009 15:01:58 +0000

This component has the following properties which need to be set: roles - one or more roles (strings) which are to be evaluated against. userRoles - one or more roles(strings) which the user has components - one or more components which will be effected if evaluation of roles against userRoles fails. type - type of evaluation to be performed one of: ‘hasAny’ - evaluates true if userRole exists in any of the roles ‘hasAll,’ - evaluates to true only if userRoles contains all roles ‘hasNone’ - evaluates to true if userRoles does not contain any of the roles.

...containsRole(_roles, userRole)) { return false; } } return true; } protected function evaluateNone() : Boolean { for each(var userRole : String in _userRoles) { if (containsRole(_roles, userRole)) { return false; } } return true; } protected function containsRole(roles : ICollectionView, role : String) : Boolean { for each(var userRole : String in roles) { if (role == userRole) { return true; } } return false; } protected function applyResult(result : Boolean) : void { for each(var comp : UIComponent in _components) { switch(behaviour) { case DISABLE : comp.enabled = result; break; case VANISH : comp.visible = result; break; case COLLAPSE : comp.visible = result; comp.includeInLayout = result; } } } public function get roles():Object { return _roles; } public function set roles(val:Object):void { _roles = convertToCollection(val); evaluate(); } public function get userRoles():Object { return _userRoles; } public function set userRoles(val:Object):void { _userRoles = convertToCollection(val); userRoles.addEventListener(CollectionEvent.

Simple Object Assembler release update

rob — Fri, 15 May 2009 03:47:59 +0000

There have been a couple of releases of the Simple Object Assembler in quick succession over the last week. These changes are all in aid of simplifying it’s use and can dramatically reduce the number of converters required in some projects due to enhancements to the auto-mapping capabilities. One project i’m using it on saw [...]

Evolve The Future – Evolution in Javascript

Jonathan — Sun, 03 May 2009 11:25:43 +0000

Evolve The Future is a “proof of concept” evolution simulator inspired by Thomas Ray’s Tierra application, which he always promised would be a networked environment for digital wildlife. I haven’t created that, but hopefully this is a step in that direction. Little animals run around, reproduce and eat each other. Each animal is written in [...]

Unwanted IE7 Horizontal Scrollbar

rob — Mon, 13 Apr 2009 00:18:30 +0000

I came across an interesting bug today with IE7. Actually, no not interesting, frustrating is a better word to describe it. I had a random appearance of a horizontal scrollbar within a div that has a fixed height set in javascript and overflow auto to achieve a viewport style interface. The correct behaviour, the one [...]

Simple Object Assembler

rob — Sun, 29 Mar 2009 02:25:47 +0000

Going back a few years, it took a little while for me to realise the benefits of providing a clean separation of the core business domain from any consuming client, be it a web ui or remote service. I guess I always saw it as a lot of work (which it can be) and the [...]

Integrating Spring Security with BlazeDS and Flex RIAs

adam — Tue, 24 Feb 2009 14:53:43 +0000

I have found a couple of tutorials on this lying around the web, however they all take slightly different approaches, and although the information was useful, I think there is a cleaner way to do the integration. Keeping in mind of course that now that the spring guys have released the spring-flex module there will [...]

javascript closures are fun

Jonathan — Thu, 29 Jan 2009 11:09:31 +0000

I really like closures in javascript. I really miss them when I am doing work in Java, but sometimes when I use them I get a little messed up. Take the following example: var i; var objects=[1,2]; for (i=0;i < objects.length;i++) { var callback=function() { console.log(objects[i]); [...]