From b2d80610db6beda38573890ed169815e495bc663 Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <mcsinyx@disroot.org>
Date: Sun, 24 May 2020 16:34:31 +0700
Subject: [usth/ICT2.7] Engineer software

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+1
+00:00:00,220 --> 00:00:02,130
+I'm going to conclude this set of examples with
+
+2
+00:00:02,130 --> 00:00:04,750
+a system that you might also know, Bash. And in
+
+3
+00:00:04,750 --> 00:00:08,000
+case you don't, Bash is a Unix shell written as
+
+4
+00:00:08,000 --> 00:00:11,000
+a free software replacement for the traditional Bourne shell, also
+
+5
+00:00:11,000 --> 00:00:13,690
+called sh. So what I'm showing here is the
+
+6
+00:00:13,690 --> 00:00:17,950
+descriptive architecture of the command component of Bash. So, is
+
+7
+00:00:17,950 --> 00:00:22,170
+the architecture, as implemented, of the command component of Bash.
+
+8
+00:00:22,170 --> 00:00:25,390
+And the component is the one here sort of highlighted
+
+9
+00:00:25,390 --> 00:00:28,120
+in gray. And what you can see here, these names are
+
+10
+00:00:28,120 --> 00:00:31,640
+the sub components of the command component. And if we look at
+
+11
+00:00:31,640 --> 00:00:35,000
+this architecture, two design problems of the component can kind of jump
+
+12
+00:00:35,000 --> 00:00:37,870
+at us. The first one is the lack of cohesion within the
+
+13
+00:00:37,870 --> 00:00:40,830
+component. So, if you look here, you can see that only
+
+14
+00:00:40,830 --> 00:00:44,820
+a few connections exist between the sub-components. And having a low cohesion
+
+15
+00:00:44,820 --> 00:00:47,430
+is normally not a good thing for a design. The second thing
+
+16
+00:00:47,430 --> 00:00:50,860
+that we can note is the high coupling. The component has tons
+
+17
+00:00:50,860 --> 00:00:54,200
+of connections with other components. They're, these edges that are
+
+18
+00:00:54,200 --> 00:00:57,890
+leaving the components and going towards other parts of the system.
+
+19
+00:00:57,890 --> 00:01:01,190
+So basically, this component has low cohesion and high coupling, which
+
+20
+00:01:01,190 --> 00:01:04,730
+is exactly the opposite of how a good design should be.
+
+21
+00:01:04,730 --> 00:01:07,410
+Given the structure, it is clear that anytime you change
+
+22
+00:01:07,410 --> 00:01:09,970
+this component you might need to change a bunch of other
+
+23
+00:01:09,970 --> 00:01:13,440
+components in the system. And of course, when changing other components
+
+24
+00:01:13,440 --> 00:01:15,910
+in the system, you might also need to chance the command
+
+25
+00:01:15,910 --> 00:01:19,060
+component as well. And along similar lines, to understand this
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+26
+00:01:19,060 --> 00:01:21,890
+component you probably need to look at many other parts of
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+the system, which is also less than ideal. And one
+
+28
+00:01:24,690 --> 00:01:27,580
+important point here is that with all these examples, I'm not
+
+29
+00:01:27,580 --> 00:01:30,500
+really trying to criticize any specific system, what I'm trying
+
+30
+00:01:30,500 --> 00:01:34,380
+to show instead, is how complex software architectures can be, and
+
+31
+00:01:34,380 --> 00:01:37,040
+how much they can degrade over time. And this is true
+
+32
+00:01:37,040 --> 00:01:39,660
+for most systems, not just the ones that I showed you.
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