From 8a7dfa0972c83fd811a4296e7373574bea4a28d0 Mon Sep 17 00:00:00 2001 From: Nguyễn Gia Phong Date: Sun, 19 Jul 2020 20:34:40 +0700 Subject: [usth/ICT2.7] Remove Udacity transcribes --- .../6 - Architectural Evolution - lang_en_vs5.srt | 115 --------------------- 1 file changed, 115 deletions(-) delete mode 100644 usth/ICT2.7/P3L1 Software Architecture Subtitles/6 - Architectural Evolution - lang_en_vs5.srt (limited to 'usth/ICT2.7/P3L1 Software Architecture Subtitles/6 - Architectural Evolution - lang_en_vs5.srt') diff --git a/usth/ICT2.7/P3L1 Software Architecture Subtitles/6 - Architectural Evolution - lang_en_vs5.srt b/usth/ICT2.7/P3L1 Software Architecture Subtitles/6 - Architectural Evolution - lang_en_vs5.srt deleted file mode 100644 index edcf77e..0000000 --- a/usth/ICT2.7/P3L1 Software Architecture Subtitles/6 - Architectural Evolution - lang_en_vs5.srt +++ /dev/null @@ -1,115 +0,0 @@ -1 -00:00:00,090 --> 00:00:02,810 -To do that let's look at how architectural evolution - -2 -00:00:02,810 --> 00:00:06,880 -occurs in practice. Ideally when a system evolves, its prescriptive - -3 -00:00:06,880 --> 00:00:09,340 -architecture should be modified first. Just like when you - -4 -00:00:09,340 --> 00:00:12,170 -modify a building. You change the blueprint and then you - -5 -00:00:12,170 --> 00:00:13,940 -change the actual building. You don't go the other - -6 -00:00:13,940 --> 00:00:17,820 -way around. In software, unfortunately this rarely ever happens in - -7 -00:00:17,820 --> 00:00:21,706 -practice. In practice the system, and therefore it's descriptive - -8 -00:00:21,706 --> 00:00:25,150 -architecture are often directly modified. Like in this case that - -9 -00:00:25,150 --> 00:00:27,870 -I'm showing here. So what happens is that the architecture - -10 -00:00:27,870 --> 00:00:32,259 -as conceived does not change. Whereas the architecture as implemented, does - -11 -00:00:32,259 --> 00:00:35,600 -change. And therefore these two things start diverging. And this really - -12 -00:00:35,600 --> 00:00:38,720 -happens for a number of reasons. So I'm just going to list - -13 -00:00:38,720 --> 00:00:41,740 -a few of those reasons here. In some cases it - -14 -00:00:41,740 --> 00:00:45,620 -just happens for plain sloppiness. I need to make this modification - -15 -00:00:45,620 --> 00:00:47,290 -and I don't really want to go back and look at - -16 -00:00:47,290 --> 00:00:50,610 -the prescriptive architecture modified. I'm just going to make the change, and - -17 -00:00:50,610 --> 00:00:53,800 -maybe I'll fix the description later. And then you never really get - -18 -00:00:53,800 --> 00:00:56,950 -to it. In other cases you do this because of the perception - -19 -00:00:56,950 --> 00:01:00,290 -of short deadlines. If you have to do something by this afternoon, - -20 -00:01:00,290 --> 00:01:01,300 -you're not going through a four - -21 -00:01:01,300 --> 00:01:03,410 -month software architecture review, you normally just - -22 -00:01:03,410 --> 00:01:06,460 -get to it, and do it. In some cases a prescriptive architecture - -23 -00:01:06,460 --> 00:01:09,510 -is not even present, so there's a lack of documentation. So in these - -24 -00:01:09,510 --> 00:01:12,450 -cases, clearly, you cannot go and modify something that does not even - -25 -00:01:12,450 --> 00:01:15,880 -exist, and so you jump directly to the code and start modifying that. - -26 -00:01:15,880 --> 00:01:18,280 -And as I said there's many, many more - -27 -00:01:18,280 --> 00:01:21,080 -other reasons why that happen. But important point here is - -28 -00:01:21,080 --> 00:01:23,770 -that it does happen and it does happen often - -29 -00:01:23,770 --> 00:01:27,250 -and the result is that prescriptive and descriptive architectures diverge. -- cgit 1.4.1