Next rig? Work in progess…

Posted on December 29, 2008

I’m not buying anything yet since can’t really afford it. So I decided to wait until Duke Nukem Forever is released ;-)

Also, since I don’t really need retail box with cables and manuals and to save money I will buy OEM components.

Image	Product Description	Total Price
	UltraSharp 2009W 20” Widescreen LCD Monitor with Height Adjustable Stand	$239.99
	ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard – Retail	$125.99
	HIS Hightech H487F512P Radeon HD 4870 512MB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card – Retail	$243.99
	COOLER MASTER Real Power Pro RS-650-ACAA-A1 650W ATX Form Factor 12V V2.3 / SSI Standard EPS 12V V2.91 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC Power Supply – Retail	$97.79
	Intel Core 2 Duo E8500 Wolfdale 3.16GHz LGA 775 65W Dual-Core Processor Model BX80570E8500 – Retail	$229.49
	Sunbeam CR-CCTF 120mm “Core Contact Freezer” CPU Cooler – Retail	$46.49
	Crucial Ballistix 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model BL2KIT25664AA80A – Retail	$51.25
	Two disk for RAID 0: SAMSUNG SpinPoint T Series HD501LJ 500GB 7200 RPM SATA 3.0Gb/s Hard Drive – OEM	$67.49 $67.49
Subtotal:		$1173

Rich internet applications

Posted on December 13, 2008

Flex, JavaFX, GWT, Silverlight something interesting is coming soon!

Rum, red wine, honey + tree bark

Posted on December 11, 2008

Mama Juana from Dominican Republic and is really, really good, smooth drink. Right now I’m a happy consumer ;-)

Will buy again for sure! ( or should I homebrew some using maple syrop and wood from the backyard? Hmmm)

Type and subclassing

Posted on December 5, 2008

I was reading Snyder’s 86 paper where he describes how inheritance violates encapsulations and it helped me realized the reason for duck typing.

In most modern OO languages we define a subtype (of class A) by inheritance (B : implements A). However what if B can be implemented more efficiently by using different algorithms while at the same time preserving the same programming interface (type). But now A and B have no common ancestors and in most languages will be treated as different types. So you can’t pass B to code that expects an object of type or subtype of A. To avoid this problem Snyder recommends to separate sub-typing from inheritance. Instead sub-typing should be based in behaviour of the objects. If instances of class B meet the external interface of class A, then B  should be a subtype of A.

ps I thing functional languages like haskell and skala treat type issue more seriously.

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