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159 lines
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<div class="section" id="architectural-principles">
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<h1>Architectural Principles<a class="headerlink" href="#architectural-principles" title="Permalink to this headline">¶</a></h1>
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<p>This document outlines architectural principles used in the design of
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plone.app.discussion.</p>
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<blockquote>
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<dl class="docutils">
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<dt><strong>Discussion items have a portal_type</strong></dt>
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<dd>This makes it easier to search for them and manage them using existing
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CMF and Plone UI constructs.</dd>
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<dt><strong>Discussion items are cataloged</strong></dt>
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<dd>It is be possible to search for discussion items like any other type of
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content.</dd>
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<dt><strong>Discussion items are subject to workflow and permission</strong></dt>
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<dd>Moderation, anonymous commenting, and auto approve/reject should be
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handled using workflow states, automatic and manual transitions, and
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permissions.</dd>
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<dt><strong>Discussion items are light weight objects</strong></dt>
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<dd>Discussion item objects are as light weight as possible.
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Ideally, a discussion item should be as lightweight as a catalog brain.
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This may mean that we forego convenience base classes and re-implement
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certain interfaces. Comments should not provide the full set of dublin
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core metadata, though custom indexers can be used to provide values for
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standard catalog indexes.</dd>
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<dt><strong>Optimise for retrival speed</strong></dt>
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<dd>This allows plugins (such as spam protection algorithms) to provide
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additional validation</dd>
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<dt><strong>Discussion items are stored in a BTree container</strong></dt>
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<dd>This allows faster lookup and manipulation</dd>
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<dt><strong>Discussion items are accessed using a dict-like interface</strong></dt>
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<dd>This makes iteration and manipulation more natural. Even if comments are
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not stored threaded, the dict interface should act as if they are, i.e.
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calling items() on a comment should return the replies to that comment
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(in order).</dd>
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<dt><strong>Discussion items are retrieved in reverse creation date order</strong></dt>
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<dd>Discussion items do not need to support explicit ordering. They should
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They can be stored with keys so that this is always true.</dd>
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discussion items are added, removed, or modified.</dd>
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</dl>
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