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<div class="section" id="implementing-the-notify-changetracking-policy">
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<h1>Implementing the Notify ChangeTracking Policy<a class="headerlink" href="#implementing-the-notify-changetracking-policy" title="Permalink to this headline">¶</a></h1>
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<p><em>Section author: Roman Borschel (<a class="reference external" href="mailto:roman%40code-factory.org">roman<span>@</span>code-factory<span>.</span>org</a>)</em></p>
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<p>The NOTIFY change-tracking policy is the most effective
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change-tracking policy provided by Doctrine but it requires some
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boilerplate code. This recipe will show you how this boilerplate
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code should look like. We will implement it on a
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<a class="reference external" href="http://martinfowler.com/eaaCatalog/layerSupertype.html">Layer Supertype</a>
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for all our domain objects.</p>
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<div class="section" id="implementing-notifypropertychanged">
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<h2>Implementing NotifyPropertyChanged<a class="headerlink" href="#implementing-notifypropertychanged" title="Permalink to this headline">¶</a></h2>
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<p>The NOTIFY policy is based on the assumption that the entities
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notify interested listeners of changes to their properties. For
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that purpose, a class that wants to use this policy needs to
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implement the <code class="docutils literal"><span class="pre">NotifyPropertyChanged</span></code> interface from the
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<code class="docutils literal"><span class="pre">Doctrine\Common</span></code> namespace.</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="k">use</span> <span class="nx">Doctrine\Common\NotifyPropertyChanged</span><span class="p">,</span>
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<span class="nx">Doctrine\Common\PropertyChangedListener</span><span class="p">;</span>
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<span class="k">abstract</span> <span class="k">class</span> <span class="nc">DomainObject</span> <span class="k">implements</span> <span class="nx">NotifyPropertyChanged</span>
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<span class="p">{</span>
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<span class="k">private</span> <span class="nv">$_listeners</span> <span class="o">=</span> <span class="k">array</span><span class="p">();</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">addPropertyChangedListener</span><span class="p">(</span><span class="nx">PropertyChangedListener</span> <span class="nv">$listener</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">_listeners</span><span class="p">[]</span> <span class="o">=</span> <span class="nv">$listener</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="sd">/** Notifies listeners of a change. */</span>
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<span class="k">protected</span> <span class="k">function</span> <span class="nf">_onPropertyChanged</span><span class="p">(</span><span class="nv">$propName</span><span class="p">,</span> <span class="nv">$oldValue</span><span class="p">,</span> <span class="nv">$newValue</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">_listeners</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">foreach</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">_listeners</span> <span class="k">as</span> <span class="nv">$listener</span><span class="p">)</span> <span class="p">{</span>
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<span class="nv">$listener</span><span class="o">-></span><span class="na">propertyChanged</span><span class="p">(</span><span class="nv">$this</span><span class="p">,</span> <span class="nv">$propName</span><span class="p">,</span> <span class="nv">$oldValue</span><span class="p">,</span> <span class="nv">$newValue</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>Then, in each property setter of concrete, derived domain classes,
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you need to invoke _onPropertyChanged as follows to notify
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listeners:</p>
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<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
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<span class="c1">// Mapping not shown, either in annotations, xml or yaml as usual</span>
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<span class="k">class</span> <span class="nc">MyEntity</span> <span class="k">extends</span> <span class="nx">DomainObject</span>
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<span class="p">{</span>
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<span class="k">private</span> <span class="nv">$data</span><span class="p">;</span>
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<span class="c1">// ... other fields as usual</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">setData</span><span class="p">(</span><span class="nv">$data</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="nv">$data</span> <span class="o">!=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">data</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// check: is it actually modified?</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">_onPropertyChanged</span><span class="p">(</span><span class="s1">'data'</span><span class="p">,</span> <span class="nv">$this</span><span class="o">-></span><span class="na">data</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
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<span class="nv">$this</span><span class="o">-></span><span class="na">data</span> <span class="o">=</span> <span class="nv">$data</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>The check whether the new value is different from the old one is
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not mandatory but recommended. That way you can avoid unnecessary
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updates and also have full control over when you consider a
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property changed.</p>
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<h3><a href="../index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Implementing the Notify ChangeTracking Policy</a><ul>
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<li><a class="reference internal" href="#implementing-notifypropertychanged">Implementing NotifyPropertyChanged</a></li>
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