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| |
| <p>The native client release contains an example showing how a client application |
| can register for serialization of custom objects using the C++ PdxSerializable abstract class.</p> |
| |
| <p>The example is located in <code>examples/cpp/pdxserializable</code>.</p> |
| |
| <p>The example defines 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><p>To run the example, follow the instructions in the README.md file in the example directory.</p></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> abstract class. |
| 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 <code>PdxSerializable</code> 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">&</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">&</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"><</span><span class="n">PdxSerializable</span><span class="o">></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"><</span><span class="n">Order</span><span class="o">></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">cache</span> <span class="o">=</span> <span class="n">CacheFactory</span><span class="p">()</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="p">.</span><span class="n">create</span><span class="p">();</span> |
| |
| <span class="n">cache</span><span class="p">.</span><span class="n">getPoolManager</span><span class="p">()</span> |
| <span class="p">.</span><span class="n">createFactory</span><span class="p">()</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="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"><</span><span class="n">Order</span><span class="o">></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"><</span><span class="n">Order</span><span class="o">></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">-></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">-></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"><</span><span class="n">Order</span><span class="o">></span><span class="p">(</span><span class="n">region</span><span class="o">-></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"><<</span> <span class="s">"OrderID: "</span> <span class="o"><<</span> <span class="n">order1retrieved</span><span class="o">-></span><span class="n">getOrderId</span><span class="p">()</span> <span class="o"><<</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"><<</span> <span class="s">"Product Name: "</span> <span class="o"><<</span> <span class="n">order1retrieved</span><span class="o">-></span><span class="n">getName</span><span class="p">()</span> <span class="o"><<</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"><<</span> <span class="s">"Quantity: "</span> <span class="o"><<</span> <span class="n">order1retrieved</span><span class="o">-></span><span class="n">getQuantity</span><span class="p">()</span> <span class="o"><<</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"><<</span> <span class="s">"Order 1 not found."</span> <span class="o"><<</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">-></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"><<</span> <span class="s">"rtimmons's info not deleted"</span> <span class="o"><<</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"><<</span> <span class="s">"rtimmons's info successfully deleted"</span> <span class="o"><<</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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