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<h4>Nat!</h4>
<p>Senior Mull</p>
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<h2>De Re NSObject <div style="font-size:10px; display: inline-block;">0.0.1</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
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<h2>De Re NSObject <div style="font-size:10px; display: inline-block;">0.0.1</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
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<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
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<article>
<h1>MulleObject</h1>
<div>
<p>Welcome to the world of <strong>MulleObject</strong>, a powerful extension of <code class="language-plaintext highlighter-rouge">MulleDynamicObject</code>
that brings thread-safety to the forefront of Objective-C programming. As you
delve into this advanced concept, you’ll discover how <code class="language-plaintext highlighter-rouge">MulleObject</code> not only
inherits the dynamic capabilities of its parent class but also introduces a
robust thread-safety layer through the MulleObjCThreadsafe protocol
implementation.</p>
<p>Let’s begin by examining the core functionality of <code class="language-plaintext highlighter-rouge">MulleObject</code>. You might be
wondering, “How does MulleObject achieve thread-safety in multi-threaded
environments?” The answer lies in its innovative shared lock mechanism. This
system allows multiple related objects to operate under a single lock, a concept
known as “lock cohesion” or “synchronized object groups.”</p>
<p>Consider this hierarchical structure:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> RootView (lock A)
├── HeaderView (uses lock A)
│ ├── TitleLabel (uses lock A)
│ └── MenuButton (uses lock A)
└── ContentView (uses lock A)
├── ImageView (uses lock A)
└── DescriptionLabel (uses lock A)
</code></pre></div></div>
<p>In this example, instead of each view maintaining its own lock, the entire
hierarchy shares a single lock from the RootView. This approach offers several
significant advantages:</p>
<ol>
<li>Prevention of lock explosion: In deep view trees, you won’t end up with an
overwhelming number of locks.</li>
<li>Consistency maintenance: The entire hierarchy maintains a consistent state.</li>
<li>Reduced memory overhead: Fewer locks mean less memory usage.</li>
<li>Simplified synchronization logic: With a shared lock, you can avoid complex
lock management scenarios.</li>
</ol>
<p>Now, let’s dive into some code to see how you might use MulleObject in practice:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@interface</span> <span class="nc">MyView</span> <span class="p">:</span> <span class="nc">MulleObject</span> <span class="o"><</span> <span class="n">MulleAutolockingObjectProtocols</span><span class="o">></span>
<span class="k">@property</span><span class="p">(</span> <span class="n">dynamic</span><span class="p">,</span> <span class="n">copy</span><span class="p">)</span> <span class="n">NSString</span> <span class="o">*</span><span class="n">name</span><span class="p">;</span>
<span class="k">@property</span><span class="p">(</span> <span class="n">copy</span><span class="p">)</span> <span class="n">NSString</span> <span class="o">*</span><span class="n">title</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">nop</span> <span class="n">MULLE_OBJC_THREADSAFE_METHOD</span><span class="p">;</span>
<span class="k">@end</span>
<span class="k">@implementation</span> <span class="nc">MyView</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">nop</span>
<span class="p">{</span>
<span class="c1">// inherently thread safe code</span>
<span class="p">}</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>The default “MulleObject” without <code class="language-plaintext highlighter-rouge">MulleAutolockingObjectProtocols</code> will NOT
be thread-safe. You need to adopt those protocol to activate the thread-safe
locking wrapping functionality.</p>
<p>You can see how <code class="language-plaintext highlighter-rouge">MyView</code> uses a dynamic property “name” and a conventional
instance variable based property “title”. But both properties’ accessors,
<code class="language-plaintext highlighter-rouge">setName:</code> and <code class="language-plaintext highlighter-rouge">name</code> as well as the
<code class="language-plaintext highlighter-rouge">setTitle:</code> and <code class="language-plaintext highlighter-rouge">title</code>, use the locking provided by MulleObject.</p>
<p>The method <code class="language-plaintext highlighter-rouge">nop</code> is labeled as a <code class="language-plaintext highlighter-rouge">MULLE_OBJC_THREADSAFE_METHOD</code> therefore is
outside of the locking mechanism of MulleObject”</p>
<h2 id="lock-sharing">Lock Sharing</h2>
<p>The lock sharing model in MulleObject is particularly efficient for:</p>
<ol>
<li>View hierarchies</li>
<li>Document object models</li>
<li>Composite data structures</li>
<li>Parent-child relationships</li>
</ol>
<p>These scenarios naturally involve related objects that need to maintain
consistent state, making them ideal candidates for shared lock synchronization.</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@interface</span> <span class="nc">Foo</span> <span class="p">:</span> <span class="nc">MulleObject</span> <span class="o"><</span> <span class="n">MulleAutolockingObjectProtocols</span><span class="o">></span>
<span class="k">@end</span>
<span class="k">@implementation</span> <span class="nc">Foo</span>
<span class="k">@end</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span> <span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span>
<span class="p">{</span>
<span class="n">Foo</span> <span class="o">*</span><span class="n">a</span><span class="p">,</span> <span class="o">*</span><span class="n">b</span><span class="p">;</span>
<span class="n">a</span> <span class="o">=</span> <span class="p">[</span><span class="n">Foo</span> <span class="nf">object</span><span class="p">];</span>
<span class="n">b</span> <span class="o">=</span> <span class="p">[</span><span class="n">Foo</span> <span class="nf">object</span><span class="p">];</span>
<span class="p">[</span><span class="n">b</span> <span class="nf">shareRecursiveLockWithObject</span><span class="p">:</span><span class="n">a</span><span class="p">];</span>
<span class="k">return</span><span class="p">(</span> <span class="mi">0</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div></div>
<p>Now whenever you access either ‘a’ or ‘b’, you will effectively lock both
objects. Because of the recursive nature of the lock, subsequent method
calls during the lock duration, will not deadlock and will be much cheaper in
terms of runtime execution.</p>
<h2 id="summary">Summary</h2>
<p>In conclusion, MulleObject represents a significant advancement in Objective-C
programming, offering a powerful solution for creating thread-safe, dynamic
objects. By leveraging its capabilities, you can build robust, efficient, and
scalable applications that can handle complex multi-threaded scenarios with
ease.</p>
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