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   <h1 class="title-container" >
     Serializing Data
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 <p>Data in your client application&rsquo;s Geode cache must be serializable to be shared with Geode servers and other
 Geode clients.
 Geode provides multiple data serialization options for storage and transmittal
 between processes, of which <strong>Geode Portable Data eXchange (PDX) serialization</strong> offers
 the best combination of versatility and ease-of-use for most applications.</p>

 <p>To learn more about other serialization options, see the <a href="serverman/developing/data_serialization/chapter_overview.html">Data Serialization section in the <em>Apache Geode User Guide</em></a>.</p>

 <p><a id="implementing_pdxsbl_class"></a></p>

 <h2 id="implementing-a-pdxserializable-custom-class">Implementing a PdxSerializable Custom Class</h2>

 <p>Pdx serialization provides custom serialization to an individual class. Fields within an object can be serialized separately from the rest of the class.</p>

 <p>The type of serialization and its implementation can be specified entirely in the client
 application, with no need to create corresponding code on the Geode server.</p>

 <p><a id="setup_pdxsbl_class"></a></p>

 <h3 id="setup">Setup</h3>

 <p>Pdx serialization provides custom serialization to an individual class. Fields within an object can be serialized separately from the rest of the class.</p>

 <p>Setting up a custom class for PdxSerializable treatment requires some preparatory steps:</p>

 <ul>
 <li><p>The custom class must inherit from the C++ PdxSerializable interface.</p></li>
 <li><p>You must provide serialization instructions for objects of the custom class. Specifically:</p>

 <ul>
 <li> You must implement the <code>toData()</code> and <code>fromData()</code> methods.</li>
 <li> You must provide a &ldquo;factory method&rdquo; that returns an instance of the custom object.</li>
 </ul></li>
 <li><p>Your application must register your custom class with the cache, which takes care of informing the server of your
 serialization scheme. With registration, you provide the name of the &ldquo;factory method&rdquo; you created for instantiating
 objects of the custom class.</p></li>
 </ul>

 <p><a id="pdxsbl_examples"></a></p>

 <h2 id="pdxserializable-examples">PdxSerializable Examples</h2>

 <p>The native client release contains examples showing how a client application
 can register for serialization of custom objects using the C++ PdxSerializable interface.</p>

 <p>The examples are located in <code>examples/cpp/pdxserializable</code>.</p>

 <p>The examples define the serializable class, <code>Orders</code>, including its serialization and deserialization methods and its factory method.
 Once these pieces are in place, execution is simple: the main routine of the example registers the serializable class then performs some put and get operations.</p>

 <p><a id="pdxsbl_execution"></a></p>

 <h3 id="execution">Execution</h3>

 <p>The example performs a sequence of operations, displaying simple log entries as they run.</p>

 <ul>
 <li>To run an example, follow the instructions in the README.md file in the example directory.</li>
 <li><p>Review the source code in the example directory to see exactly how it operates.</p></li>
 <li><p>Begin by running a script that sets up the server-side environment by invoking <code>gfsh</code> commands to create a region, a locator, and a server.</p></li>
 <li><p>Run the example client application, which performs the following steps:</p>

 <ul>
 <li>Connects to the server</li>
 <li>Registers the PdxSerializable class</li>
 <li>Creates orders</li>
 <li>Stores orders</li>
 <li>Retrieves orders</li>
 </ul></li>
 </ul>

 <p><a id="pdxsbl_cpp_example"></a></p>

 <h3 id="c++-example">C++ Example</h3>

 <p>This section contains code snippets showing highlights of the C++ PdxSerialiable example. They are not intended for cut-and-paste execution.
 For the complete source, see the example source directory.</p>

 <p>The C++ example defines a PdxSerializable class called <code>Order</code> that inherits from the <code>PdxSerializable</code> interface.
 An <code>Order</code> object contains three fields:</p>

 <ul>
 <li>an integer <code>order_id</code></li>
 <li>a string <code>name</code></li>
 <li>a short-int <code>quantity</code></li>
 </ul>

 <p>From Order.hpp:</p>
 <pre class="highlight cpp"><code><span class="k">class</span> <span class="nc">Order</span> <span class="o">:</span> <span class="k">public</span> <span class="n">PdxSerializable</span> <span class="p">{</span>
  <span class="k">public</span><span class="o">:</span>
  <span class="p">...</span>

  <span class="k">private</span><span class="o">:</span>
   <span class="kt">int32_t</span> <span class="n">order_id_</span><span class="p">;</span>
   <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">name_</span><span class="p">;</span>
   <span class="kt">int16_t</span> <span class="n">quantity_</span><span class="p">;</span>
 <span class="p">};</span>

 </code></pre>

 <p>Using the PdxSerializable read and write methods, the <code>Order</code> class defines <code>fromData()</code> and <code>toData()</code>
 methods that perform the deserialization and serialization operations, respectively, and the
 <code>createDeserializable()</code> factory method:</p>

 <p>From Order.cpp:</p>
 <pre class="highlight cpp"><code><span class="kt">void</span> <span class="n">Order</span><span class="o">::</span><span class="n">fromData</span><span class="p">(</span><span class="n">PdxReader</span><span class="o">&amp;</span> <span class="n">pdxReader</span><span class="p">)</span> <span class="p">{</span>
   <span class="n">order_id_</span> <span class="o">=</span> <span class="n">pdxReader</span><span class="p">.</span><span class="n">readInt</span><span class="p">(</span><span class="n">ORDER_ID_KEY_</span><span class="p">);</span>
   <span class="n">name_</span> <span class="o">=</span> <span class="n">pdxReader</span><span class="p">.</span><span class="n">readString</span><span class="p">(</span><span class="n">NAME_KEY_</span><span class="p">);</span>
   <span class="n">quantity_</span> <span class="o">=</span> <span class="n">pdxReader</span><span class="p">.</span><span class="n">readShort</span><span class="p">(</span><span class="n">QUANTITY_KEY_</span><span class="p">);</span>
 <span class="p">}</span>

 <span class="kt">void</span> <span class="n">Order</span><span class="o">::</span><span class="n">toData</span><span class="p">(</span><span class="n">PdxWriter</span><span class="o">&amp;</span> <span class="n">pdxWriter</span><span class="p">)</span> <span class="k">const</span> <span class="p">{</span>
   <span class="n">pdxWriter</span><span class="p">.</span><span class="n">writeInt</span><span class="p">(</span><span class="n">ORDER_ID_KEY_</span><span class="p">,</span> <span class="n">order_id_</span><span class="p">);</span>
   <span class="n">pdxWriter</span><span class="p">.</span><span class="n">markIdentityField</span><span class="p">(</span><span class="n">ORDER_ID_KEY_</span><span class="p">);</span>

   <span class="n">pdxWriter</span><span class="p">.</span><span class="n">writeString</span><span class="p">(</span><span class="n">NAME_KEY_</span><span class="p">,</span> <span class="n">name_</span><span class="p">);</span>
   <span class="n">pdxWriter</span><span class="p">.</span><span class="n">markIdentityField</span><span class="p">(</span><span class="n">NAME_KEY_</span><span class="p">);</span>

   <span class="n">pdxWriter</span><span class="p">.</span><span class="n">writeShort</span><span class="p">(</span><span class="n">QUANTITY_KEY_</span><span class="p">,</span> <span class="n">quantity_</span><span class="p">);</span>
   <span class="n">pdxWriter</span><span class="p">.</span><span class="n">markIdentityField</span><span class="p">(</span><span class="n">QUANTITY_KEY_</span><span class="p">);</span>
 <span class="p">}</span>

 <span class="p">...</span>

 <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o">&lt;</span><span class="n">PdxSerializable</span><span class="o">&gt;</span> <span class="n">Order</span><span class="o">::</span><span class="n">createDeserializable</span><span class="p">()</span> <span class="p">{</span>
   <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">make_shared</span><span class="o">&lt;</span><span class="n">Order</span><span class="o">&gt;</span><span class="p">();</span>
 <span class="p">}</span>
 </code></pre>

 <p>The C++ example mainline creates a cache, then uses it to create a connection pool and a region object (of class <code>Region</code>).</p>
 <pre class="highlight cpp"><code>  <span class="k">auto</span> <span class="n">cacheFactory</span> <span class="o">=</span> <span class="n">CacheFactory</span><span class="p">();</span>
   <span class="n">cacheFactory</span><span class="p">.</span><span class="n">set</span><span class="p">(</span><span class="s">"log-level"</span><span class="p">,</span> <span class="s">"none"</span><span class="p">);</span>
   <span class="k">auto</span> <span class="n">cache</span> <span class="o">=</span> <span class="n">cacheFactory</span><span class="p">.</span><span class="n">create</span><span class="p">();</span>
   <span class="k">auto</span> <span class="n">poolFactory</span> <span class="o">=</span> <span class="n">cache</span><span class="p">.</span><span class="n">getPoolManager</span><span class="p">().</span><span class="n">createFactory</span><span class="p">();</span>

   <span class="n">poolFactory</span><span class="p">.</span><span class="n">addLocator</span><span class="p">(</span><span class="s">"localhost"</span><span class="p">,</span> <span class="mi">10334</span><span class="p">);</span>
   <span class="k">auto</span> <span class="n">pool</span> <span class="o">=</span> <span class="n">poolFactory</span><span class="p">.</span><span class="n">create</span><span class="p">(</span><span class="s">"pool"</span><span class="p">);</span>
   <span class="k">auto</span> <span class="n">regionFactory</span> <span class="o">=</span> <span class="n">cache</span><span class="p">.</span><span class="n">createRegionFactory</span><span class="p">(</span><span class="n">RegionShortcut</span><span class="o">::</span><span class="n">PROXY</span><span class="p">);</span>
   <span class="k">auto</span> <span class="n">region</span> <span class="o">=</span> <span class="n">regionFactory</span><span class="p">.</span><span class="n">setPoolName</span><span class="p">(</span><span class="s">"pool"</span><span class="p">).</span><span class="n">create</span><span class="p">(</span><span class="s">"custom_orders"</span><span class="p">);</span>
 </code></pre>

 <p>The client registers the PdxSerializable class that was created in Orders.cpp:</p>
 <pre class="highlight cpp"><code>  <span class="n">cache</span><span class="p">.</span><span class="n">getTypeRegistry</span><span class="p">().</span><span class="n">registerPdxType</span><span class="p">(</span><span class="n">Order</span><span class="o">::</span><span class="n">createDeserializable</span><span class="p">);</span>
 </code></pre>

 <p>The client then instantiates and stores two <code>Order</code> objects:</p>
 <pre class="highlight cpp"><code>  <span class="k">auto</span> <span class="n">order1</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">make_shared</span><span class="o">&lt;</span><span class="n">Order</span><span class="o">&gt;</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">"product x"</span><span class="p">,</span> <span class="mi">23</span><span class="p">);</span>
   <span class="k">auto</span> <span class="n">order2</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">make_shared</span><span class="o">&lt;</span><span class="n">Order</span><span class="o">&gt;</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="s">"product y"</span><span class="p">,</span> <span class="mi">37</span><span class="p">);</span>

   <span class="n">region</span><span class="o">-&gt;</span><span class="n">put</span><span class="p">(</span><span class="s">"Customer1"</span><span class="p">,</span> <span class="n">order1</span><span class="p">);</span>
   <span class="n">region</span><span class="o">-&gt;</span><span class="n">put</span><span class="p">(</span><span class="s">"Customer2"</span><span class="p">,</span> <span class="n">order2</span><span class="p">);</span>
 </code></pre>

 <p>Next, the application retrieves the stored values, in one case extracting the fields defined in
 the serialization code:</p>
 <pre class="highlight cpp"><code>  <span class="k">if</span> <span class="p">(</span><span class="k">auto</span> <span class="n">order1retrieved</span> <span class="o">=</span>
           <span class="n">std</span><span class="o">::</span><span class="n">dynamic_pointer_cast</span><span class="o">&lt;</span><span class="n">Order</span><span class="o">&gt;</span><span class="p">(</span><span class="n">region</span><span class="o">-&gt;</span><span class="n">get</span><span class="p">(</span><span class="s">"Customer1"</span><span class="p">)))</span> <span class="p">{</span>
     <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"OrderID: "</span> <span class="o">&lt;&lt;</span> <span class="n">order1retrieved</span><span class="o">-&gt;</span><span class="n">getOrderId</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
     <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"Product Name: "</span> <span class="o">&lt;&lt;</span> <span class="n">order1retrieved</span><span class="o">-&gt;</span><span class="n">getName</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
     <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"Quantity: "</span> <span class="o">&lt;&lt;</span> <span class="n">order1retrieved</span><span class="o">-&gt;</span><span class="n">getQuantity</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
   <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
     <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"Order 1 not found."</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
   <span class="p">}</span>
 </code></pre>

 <p>The application retrieves the second object and displays it without extracting the separate fields:</p>
 <pre class="highlight cpp"><code>  <span class="k">if</span> <span class="p">(</span><span class="n">region</span><span class="o">-&gt;</span><span class="n">existsValue</span><span class="p">(</span><span class="s">"rtimmons"</span><span class="p">))</span> <span class="p">{</span>
     <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"rtimmons's info not deleted"</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
   <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
     <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"rtimmons's info successfully deleted"</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
   <span class="p">}</span>
 </code></pre>

 <p>Finally, the application closes the cache:</p>
 <pre class="highlight cpp"><code>  <span class="n">cache</span><span class="p">.</span><span class="n">close</span><span class="p">();</span>
 </code></pre>


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