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<?xml version="1.0"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><title>Twisted Documentation: Philosophy</title><link href="../howto/stylesheet.css" type="text/css" rel="stylesheet" /></head><body bgcolor="white"><h1 class="title">Philosophy</h1><div class="toc"><ol><li><a href="#auto0">Abstraction Levels</a></li><li><a href="#auto1">Learning Curves</a></li></ol></div><div class="content"><span></span><h2>Abstraction Levels<a name="auto0"></a></h2><p>When implementing interfaces to the operating system or
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the network, provide two interfaces:</p><ul><li>One that doesn't hide platform specific or library specific
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For example, you can use file descriptors on Unix, and Win32 events on
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</li><li>One that provides a high level interface hiding platform specific
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E.g. process running uses same API on Unix and Windows, although
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the implementation is very different.
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</li></ul><p>Restated in a more general way:</p><ul><li>Provide all low level functionality for your specific domain,
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without limiting the policies and decisions the user can make.</li><li>Provide a high level abstraction on top of the low level
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implementation (or implementations) which implements the
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common use cases and functionality that is used in most cases.</li></ul><h2>Learning Curves<a name="auto1"></a></h2><p>Require the minimal amount of work and learning on part of the
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user to get started. If this means they have less functionality,
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that's OK, when they need it they can learn a bit more. This
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will also lead to a cleaner, easier to test design.</p><p>For example - mktap together with twistd is a great way to
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deploy applications. But to get started you don't need to know
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or care about either. Later on you can start using twistd,
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and if you choose mktap as well. Using them is optional.</p></div><p><a href="../howto/index.html">Index</a></p><span class="version">Version: 1.3.0</span></body></html>
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