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136 lines
5.6 KiB
136 lines
5.6 KiB
11 months ago
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<!DOCTYPE html>
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<html lang="en">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, viewport-fit=cover">
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<title>Julio Biason .Me 4.3</title>
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<!-- CSS -->
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<link rel="stylesheet" href="https://blog.juliobiason.me/print.css" media="print">
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</head>
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<body class=" ">
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<div class="sidebar">
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<div class="container sidebar-sticky">
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<div class="sidebar-about">
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<a href="https://blog.juliobiason.me"><h1>Julio Biason .Me 4.3</h1></a>
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<p class="lead">Old school dev living in a 2.0 dev world</p>
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</div>
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<ul class="sidebar-nav">
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<li class="sidebar-nav-item"><a href="/">English</a></li>
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<li class="sidebar-nav-item"><a href="/pt">Português</a></li>
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<li class="sidebar-nav-item"><a href="/tags">Tags (EN)</a></li>
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<li class="sidebar-nav-item"><a href="/pt/tags">Tags (PT)</a></li>
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</ul>
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</div>
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<div class="content container">
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<div class="post">
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<h1 class="post-title">Things I Learnt The Hard Way - The Config File Is Friend</h1>
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<span class="post-date">
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2019-07-15
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<a href="https://blog.juliobiason.me/tags/books/">#books</a>
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<a href="https://blog.juliobiason.me/tags/things-i-learnt/">#things i learnt</a>
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<a href="https://blog.juliobiason.me/tags/configuration/">#configuration</a>
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<a href="https://blog.juliobiason.me/tags/config-file/">#config file</a>
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</span>
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<p>Do not ignore the power of configuration files.</p>
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<span id="continue-reading"></span>
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<p>Imagine you wrote a function that you have to pass a value for it to start
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processing (say, a twitter user account id). But then you have to do that with
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two values and you just call the function again with the other value.</p>
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<p>It makes more sense to use a config file and just run the application twice
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with two different config files 'cause, this way, you have a single, small,
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testable application instead of two, or a very complex application that does a
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lot of stuff.</p>
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<p>We can even jump into the idea of <a href="/books/things-i-learnt/libraries">creating
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libraries</a> and say that, instead of
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splitting your e-commerce application into smaller parts and making a big one
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by grouping these smaller parts, you could simply have one e-commerce
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application and, for each of your clients, you would have a different
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configuration file, pointing to different assets. This way, even the assets
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may reside in the same repository in the same branch, 'cause all that
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identifies which assets should be used are defined in the configuration file.</p>
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<p>"But which one should I use?" you may ask. Well, "it depends". It may make
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sense to have one single application with different configuration files if
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most of its can be used all the time. If the intersection of used things is
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very small, it may make more sense to split into different libraries and just
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"pick and chose" what to use.</p>
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<p>But besides the replacement of libraries, you can also think things like: "Ok,
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I have to remove elements after a while<sup class="footnote-reference"><a href="#1">1</a></sup>; but which would be a good time
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that they can exist before I can remove them?" Well, if you're not quite sure
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(and, sometimes, even when you're sure), you can use a configuration file to
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define how long those elements will stay in the system before being expunged.
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Maybe you're not even thinking about how long each element will stay in the
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system, but how many of those elements you'll keep in the system before
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removing the old ones -- which is, again, a good candidate to be moved to a
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configuration file.</p>
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<p>Configuration files allow you to change properties of the system without
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recompiling everything. And, if in the future you decide to follow the <a href="https://en.wikipedia.org/wiki/Twelve-Factor_App_methodology">12
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Factor app</a>,
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you'll find that you're half-way through it.</p>
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<div class="footnote-definition" id="1"><sup class="footnote-definition-label">1</sup>
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<p>In other words, they have a <a href="https://en.wikipedia.org/wiki/Time_to_live">time to
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live</a>.</p>
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</div>
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<div>
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<div style="float:left">
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<< <a href="/books/things-i-learnt/permanent-solution">Nothing More Permanent Than A Temporary Solution</a>
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</div>
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<div style="float:right">
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<a href="/books/things-i-learnt/command-line-options">Command Line Options Are Weird, But Helpful</a> >>
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</div>
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</div>
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</body>
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</html>
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