1308 lines
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1308 lines
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Books
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Lecture Notes
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Books
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Books
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Designing Data-Intensive Applications
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<span class="md-nav__icon md-icon"></span>
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Designing Data-Intensive Applications
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Preface
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Part 1. Foundations of Data Systems
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<span class="md-nav__icon md-icon"></span>
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Part 1. Foundations of Data Systems
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UML Diagrams
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UML Diagrams
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Object Orientated Analysis
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<h1 id="unified-modelling-language">Unified Modelling Language<a class="headerlink" href="#unified-modelling-language" title="Permanent link">¶</a></h1>
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<p>12/10/20</p>
|
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<p><strong>UML</strong>: A specification defining a graphical language for visualising, specifying, constructing and documenting the artefacts of distributed object systems.</p>
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<p>Latest version: <strong>2.6</strong></p>
|
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<p><strong>Benefits of UML</strong></p>
|
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<ul>
|
|
<li>Enhances communication and ensures the right communication </li>
|
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<li>Captures the logical software architecture independent of the implementation language.</li>
|
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<li>Helps to manage the complexity</li>
|
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<li>Enables reuse of design</li>
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</ul>
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<p><img src="assets/4.png" alt="img" style="zoom:80%;" /></p>
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<h2 id="object-orientated-analysis">Object Orientated Analysis<a class="headerlink" href="#object-orientated-analysis" title="Permanent link">¶</a></h2>
|
|
<p><strong>Use case diagrams</strong></p>
|
|
<ul>
|
|
<li>Describe a set of actions that some system should or can perform in collaboration with one or more external users of the system.</li>
|
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<li>No attempt to represent an order or a number of executions.</li>
|
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</ul>
|
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<p><strong>Use case diagram components</strong></p>
|
|
<p><code>Actors</code> - Entities that interface with the system. Can be people or other systems.</p>
|
|
<p><code>Use case</code> - Based on user stories and represent what the actor wants your system to do for them. In the use case diagram only the use case name is represented.</p>
|
|
<p><code>Subject</code> - Classifier representing a business, software system, physical system or device under analysis design, or consideration.</p>
|
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<p><code>Relationships</code> </p>
|
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<blockquote>
|
|
<p>Relationships between use case and actor</p>
|
|
<ol>
|
|
<li>Association indicates which actor indicates which use case</li>
|
|
</ol>
|
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<p>Relationship between two use cases</p>
|
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<ol>
|
|
<li>Specifying common functionality and simplifying use case flows</li>
|
|
<li>Using <<include>> or <<extend>></li>
|
|
</ol>
|
|
</blockquote>
|
|
<p><strong><code><<include>></code></strong>- multiple use cases share a piece of same functionality which is placed in a separate use case.</p>
|
|
<p><strong><code><<extend>></code></strong> - Used when activities might be performed as part of another activity but are not mandatory for a use case to run successfully.</p>
|
|
<p><strong>Use case diagram of a fleet logistics management company</strong></p>
|
|
<p><img alt="image" src="../assets/5.png" /></p>
|
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<p><strong>Base Path</strong> - The optimistic path (best case scenario)</p>
|
|
<p><strong>Alternative Path</strong> - Every other possible way the system can be used/abused. Includes perfectly normal alternate use, but also errors and failures.</p>
|
|
<p>Use Case: <code>Borrow copy of book</code></p>
|
|
<blockquote>
|
|
<p><strong>Purpose</strong>: The book borrower (BB) borrows a book from the library using the Library Booking System (LBS)</p>
|
|
<p><strong>Pre-conditions</strong>: </p>
|
|
<ol>
|
|
<li>The book must exist</li>
|
|
<li>The book must be available</li>
|
|
</ol>
|
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<p><strong>Base Path</strong>:</p>
|
|
<ol>
|
|
<li>LBS requests membership card</li>
|
|
<li>BB provides membership card</li>
|
|
<li>BB is logged in by LBS </li>
|
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<li>LBS checks permissions / debts </li>
|
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<li>LBS asks for presenting a book </li>
|
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<li>BB presents a book </li>
|
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<li>LBS scans RFID tag inside book </li>
|
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<li>LBS updates records accordingly </li>
|
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<li>LBS disables anti-theft device </li>
|
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<li>BB is logged out by LBS </li>
|
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<li>LBS confirms that process has been completed successfully</li>
|
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</ol>
|
|
<p><strong>Alternative Path</strong></p>
|
|
<ol>
|
|
<li>BB's card has expired: Step 3a: LBS must provide a message that card has expired; LBS must exit the use case</li>
|
|
</ol>
|
|
<p><strong>Post conditions for base path</strong></p>
|
|
<p><strong>Base path</strong> - BB has successfully borrowed the book & system is up to date.</p>
|
|
<p><strong>Alternate Path 1</strong> - BB was NOT able to borrow the book & system is up to date.</p>
|
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</blockquote>
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</article>
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