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05_building_block_view.html
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<body class="article">
<div id="header">
</div>
<div id="content">
<div class="sect1">
<h2 id="section-building-block-view">Building Block View</h2>
<div class="sectionbody">
<div class="imageblock">
<div class="content">
<img src="../images/05_building_blocks-EN.png" alt="Hierarchy of building blocks">
</div>
</div>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<div class="title">Content</div>
<p>The building block view shows the static decomposition of the system into building blocks (modules, components, subsystems, classes, interfaces, packages, libraries, frameworks, layers, partitions, tiers, functions, macros, operations, data structures, …​) as well as their dependencies (relationships, associations, …​)</p>
</div>
<div class="paragraph">
<p>This view is mandatory for every architecture documentation.
In analogy to a house this is the <em>floor plan</em>.</p>
</div>
<div class="paragraph">
<div class="title">Motivation</div>
<p>Maintain an overview of your source code by making its structure understandable through
abstraction.</p>
</div>
<div class="paragraph">
<p>This allows you to communicate with your stakeholder on an abstract level without disclosing implementation details.</p>
</div>
<div class="paragraph">
<div class="title">Form</div>
<p>The building block view is a hierarchical collection of black boxes and white boxes
(see figure below) and their descriptions.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../images/05_building_blocks-EN.png" alt="Hierarchy of building blocks">
</div>
</div>
<div class="paragraph">
<p><strong>Level 1</strong> is the white box description of the overall system together with black
box descriptions of all contained building blocks.</p>
</div>
<div class="paragraph">
<p><strong>Level 2</strong> zooms into some building blocks of level 1.
Thus it contains the white box description of selected building blocks of level 1, together with black box descriptions of their internal building blocks.</p>
</div>
<div class="paragraph">
<p><strong>Level 3</strong> zooms into selected building blocks of level 2, and so on.</p>
</div>
<div class="paragraph">
<div class="title">Further Information</div>
<p>See <a href="https://docs.arc42.org/section-5/">Building Block View</a> in the arc42 documentation.</p>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_whitebox_overall_system">Whitebox Overall System</h3>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>Here you describe the decomposition of the overall system using the following white box template. It contains</p>
</div>
<div class="ulist">
<ul>
<li>
<p>an overview diagram</p>
</li>
<li>
<p>a motivation for the decomposition</p>
</li>
<li>
<p>black box descriptions of the contained building blocks. For these we offer you alternatives:</p>
<div class="ulist">
<ul>
<li>
<p>use <em>one</em> table for a short and pragmatic overview of all contained building blocks and their interfaces</p>
</li>
<li>
<p>use a list of black box descriptions of the building blocks according to the black box template (see below).
Depending on your choice of tool this list could be sub-chapters (in text files), sub-pages (in a Wiki) or nested elements (in a modeling tool).</p>
</li>
</ul>
</div>
</li>
<li>
<p>(optional:) important interfaces, that are not explained in the black box templates of a building block, but are very important for understanding the white box.
Since there are so many ways to specify interfaces why do not provide a specific template for them.
In the worst case you have to specify and describe syntax, semantics, protocols, error handling,
restrictions, versions, qualities, necessary compatibilities and many things more.
In the best case you will get away with examples or simple signatures.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="paragraph">
<p><em><strong><Overview Diagram></strong></em></p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Motivation</dt>
<dd>
<p><em><text explanation></em></p>
</dd>
<dt class="hdlist1">Contained Building Blocks</dt>
<dd>
<p><em><Description of contained building block (black boxes)></em></p>
</dd>
<dt class="hdlist1">Important Interfaces</dt>
<dd>
<p><em><Description of important interfaces></em></p>
</dd>
</dl>
</div>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>Insert your explanations of black boxes from level 1:</p>
</div>
<div class="paragraph">
<p>If you use tabular form you will only describe your black boxes with name and
responsibility according to the following schema:</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 33.3333%;">
<col style="width: 66.6667%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top"><strong>Name</strong></th>
<th class="tableblock halign-left valign-top"><strong>Responsibility</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em><black box 1></em></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"> <em><Text></em></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><em><black box 2></em></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"> <em><Text></em></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>If you use a list of black box descriptions then you fill in a separate black box template for every important building block .
Its headline is the name of the black box.</p>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_name_black_box_1"><Name black box 1></h4>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>Here you describe <black box 1>
according the the following black box template:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Purpose/Responsibility</p>
</li>
<li>
<p>Interface(s), when they are not extracted as separate paragraphs. This interfaces may include qualities and performance characteristics.</p>
</li>
<li>
<p>(Optional) Quality-/Performance characteristics of the black box, e.g.availability, run time behavior, …​.</p>
</li>
<li>
<p>(Optional) directory/file location</p>
</li>
<li>
<p>(Optional) Fulfilled requirements (if you need traceability to requirements).</p>
</li>
<li>
<p>(Optional) Open issues/problems/risks</p>
</li>
</ul>
</div>
</div>
</div>
<div class="paragraph">
<p><em><Purpose/Responsibility></em></p>
</div>
<div class="paragraph">
<p><em><Interface(s)></em></p>
</div>
<div class="paragraph">
<p><em><(Optional) Quality/Performance Characteristics></em></p>
</div>
<div class="paragraph">
<p><em><(Optional) Directory/File Location></em></p>
</div>
<div class="paragraph">
<p><em><(Optional) Fulfilled Requirements></em></p>
</div>
<div class="paragraph">
<p><em><(optional) Open Issues/Problems/Risks></em></p>
</div>
</div>
<div class="sect3">
<h4 id="_name_black_box_2"><Name black box 2></h4>
<div class="paragraph">
<p><em><black box template></em></p>
</div>
</div>
<div class="sect3">
<h4 id="_name_black_box_n"><Name black box n></h4>
<div class="paragraph">
<p><em><black box template></em></p>
</div>
</div>
<div class="sect3">
<h4 id="_name_interface_1"><Name interface 1></h4>
<div class="paragraph">
<p>…​</p>
</div>
</div>
<div class="sect3">
<h4 id="_name_interface_m"><Name interface m></h4>
</div>
</div>
<div class="sect2">
<h3 id="_level_2">Level 2</h3>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>Here you can specify the inner structure of (some) building blocks from level 1 as white boxes.</p>
</div>
<div class="paragraph">
<p>You have to decide which building blocks of your system are important enough to justify such a detailed description.
Please prefer relevance over completeness. Specify important, surprising, risky, complex or volatile building blocks.
Leave out normal, simple, boring or standardized parts of your system</p>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_white_box_building_block_1">White Box <em><building block 1></em></h4>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>…​describes the internal structure of <em>building block 1</em>.</p>
</div>
</div>
</div>
<div class="paragraph">
<p><em><white box template></em></p>
</div>
</div>
<div class="sect3">
<h4 id="_white_box_building_block_2">White Box <em><building block 2></em></h4>
<div class="paragraph">
<p><em><white box template></em></p>
</div>
<div class="paragraph">
<p>…​</p>
</div>
</div>
<div class="sect3">
<h4 id="_white_box_building_block_m">White Box <em><building block m></em></h4>
<div class="paragraph">
<p><em><white box template></em></p>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_level_3">Level 3</h3>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>Here you can specify the inner structure of (some) building blocks from level 2 as white boxes.</p>
</div>
<div class="paragraph">
<p>When you need more detailed levels of your architecture please copy this
part of arc42 for additional levels.</p>
</div>
</div>
</div>
<div class="sect3">
<h4 id="_white_box_building_block_x_1">White Box <_building block x.1_></h4>
<div class="sidebarblock arc42help">
<div class="content">
<div class="paragraph">
<p>Specifies the internal structure of <em>building block x.1</em>.</p>
</div>
</div>
</div>
<div class="paragraph">
<p><em><white box template></em></p>
</div>
</div>
<div class="sect3">
<h4 id="_white_box_building_block_x_2">White Box <_building block x.2_></h4>
<div class="paragraph">
<p><em><white box template></em></p>
</div>
</div>
<div class="sect3">
<h4 id="_white_box_building_block_y_1">White Box <_building block y.1_></h4>
<div class="paragraph">
<p><em><white box template></em></p>
</div>
</div>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2023-02-03 10:47:02 +0100
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