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

---
 .../19 - Cost of Refactoring - lang_en_vs4.srt     | 127 +++++++++++++++++++++
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diff --git a/usth/ICT2.7/P4L5 Software Refactoring Subtitles/19 - Cost of Refactoring - lang_en_vs4.srt b/usth/ICT2.7/P4L5 Software Refactoring Subtitles/19 - Cost of Refactoring - lang_en_vs4.srt
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+1
+00:00:00,080 --> 00:00:03,800
+Let's also talk about the cost of refactoring. Refactoring might be
+
+2
+00:00:03,800 --> 00:00:06,750
+free or almost free if you're using a tool to do refactoring
+
+3
+00:00:06,750 --> 00:00:08,570
+as we did in our demo. But that's not always the
+
+4
+00:00:08,570 --> 00:00:12,530
+case. In many cases, refactoring involves quite a bit of manual work
+
+5
+00:00:12,530 --> 00:00:16,309
+if you're doing some manual refactoring. And how much that costs
+
+6
+00:00:16,309 --> 00:00:19,460
+depends on how well the operations on the source code are supported.
+
+7
+00:00:19,460 --> 00:00:22,379
+You might have partial support from an ID. You might have complete
+
+8
+00:00:22,379 --> 00:00:25,017
+support, in which case it's greater. Or you might have no support,
+
+9
+00:00:25,017 --> 00:00:26,879
+in which case you have to be very careful about
+
+10
+00:00:26,879 --> 00:00:28,888
+how you change your code and how you check that you
+
+11
+00:00:28,888 --> 00:00:32,030
+didn't change the behavior of the code. There's also an additional
+
+12
+00:00:32,030 --> 00:00:34,460
+cost associated with refactoring. Remember
+
+13
+00:00:34,460 --> 00:00:36,990
+that refactoring relies heavily on testing
+
+14
+00:00:36,990 --> 00:00:39,808
+after each small step of refactoring. So you might have
+
+15
+00:00:39,808 --> 00:00:43,451
+to develop test cases, specifically to check your refactoring. And even
+
+16
+00:00:43,451 --> 00:00:47,163
+if you have an existing test because, for example, you're working
+
+17
+00:00:47,163 --> 00:00:50,235
+some agile context and therefore you develop a lot of UNIX
+
+18
+00:00:50,235 --> 00:00:53,550
+test cases before writing your code. And therefore you have a good
+
+19
+00:00:53,550 --> 00:00:56,635
+regression test with it you can use every time you modify your code.
+
+20
+00:00:56,635 --> 00:00:59,550
+Nevertheless, when you refactor and you change your code, you might need
+
+21
+00:00:59,550 --> 00:01:03,255
+to update your test so it's not only the development of the test
+
+22
+00:01:03,255 --> 00:01:05,379
+cases but also it's maintaining the test cases. And if you have
+
+23
+00:01:05,379 --> 00:01:07,970
+a lot of test cases, you have to maintain more test cases. So
+
+24
+00:01:07,970 --> 00:01:12,460
+that's a cost that is not directly visible but can affect quite
+
+25
+00:01:12,460 --> 00:01:15,800
+a bit the overall cost of refactoring and the overall cost of system
+
+26
+00:01:15,800 --> 00:01:18,342
+development therefore. And finally, you should not
+
+27
+00:01:18,342 --> 00:01:21,191
+under estimate the cost of documentation maintenance.
+
+28
+00:01:21,191 --> 00:01:24,241
+Applying refactoring may involve changes in interfaces,
+
+29
+00:01:24,241 --> 00:01:26,528
+names, for example, names of classes. And
+
+30
+00:01:26,528 --> 00:01:29,384
+when you make this kind of changes, you might need to update the documentation,
+
+31
+00:01:29,384 --> 00:01:30,890
+and that's also cost. It's something that
+
+32
+00:01:30,890 --> 00:01:32,900
+takes effort and therefore should be considered.
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