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Showing posts from September, 2007

Derived properties that you don't want cached

I'm rewriting a Win32 application using ECO. One of the things this application allows the user to do is to specify their preferred unit of measurement for height, distance, depth, weight, and speed. To achieve this I have an ECO class ApplicationSettings which is a singleton which identifies the units to use. I then have 2 properties for each value.... InternalLandingDistance DisplayLandingDistance The idea is that I should never expose Internal* properties in the GUI but display their corresponding Display* property instead. The Display* property will read/write the Internal* property and perform some kind of conversion on it. If I always store my values using the unit with the highest accuracy (Distance = feet, Depth = millimetres, Weight = Pounds, Speed = KPH) then I just need to convert them by the correct factor when reading/writing from the Display* properties. This isn't rocket science, obviously I can just implement these as reverse derived attributes right? T

Mr thicko thicky thickpants

Well, I feel stupid. Worse than that, I generally feel very thick. Especially yesterday! So, what happened yesterday? I went to Bletchley Park . What a brilliant place! Walking around what was for approximately 50 years one of the biggest secrets of WWII was really quite strange. The stuff these people did was simply amazing! One guy managed to figure out the inner workings of a machine none of them had ever seen just by looking at two *almost* identical messages enciphered using the same machine configuration. The second message was 5 characters shorter than the first because the operator repeated the message but decided to abbreviate some of the words to save some time. This was all they needed. Not only was the functionality of the machine divined but what seems to be the world's first (semi) programmable computer was then designed + built to decipher messages received by wireless and then transcribed to punch holes. This thing has a optical reader that works at 5,