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| Using the Geode PDX Autoserializer |
| </h1> |
| |
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| <div class="quick-links"><ul> |
| <li><a href="#auto-ser-java-interop">Java Interoperability with .NET Specific Types</a></li> |
| <li><a href="#auto-ser-remote-queries">Remote Queries of .NET Only Types</a></li> |
| <li><a href="#pdx-ser-extending-auto">Extending the PDX Autoserializer</a></li> |
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| |
| <p>It’s extremely easy for .NET applications to store and retrieve data from Geode. All that’s required |
| is a single line of code to set the <code>PdxSerializer</code> to the .NET client’s <code>ReflectionBasedAutoSerializer</code>:</p> |
| <pre class="highlight csharp"><code><span class="n">cache</span><span class="p">.</span><span class="n">TypeRegistry</span><span class="p">.</span><span class="n">PdxSerializer</span> <span class="p">=</span> <span class="k">new</span> <span class="nf">ReflectionBasedAutoSerializer</span><span class="p">();</span> |
| </code></pre> |
| |
| <p>(The autoserializer can be registered only in the application code. It cannot be configured declaratively in <code>cache.xml</code>.)</p> |
| |
| <p>After an autoserializer has been registered, all user classes can automatically be stored without needing to implement any |
| interfaces. For example, the following <code>put</code> command stores <code>value</code>, which is an instance of a user defined class, in |
| the region.</p> |
| <pre class="highlight csharp"><code><span class="n">region</span><span class="p">.</span><span class="nf">put</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="k">value</span><span class="p">);</span> |
| </code></pre> |
| |
| <p>The .NET client’s <code>ReflectionBasedAutoSerializer</code> supports the full list of .NET primitives and other common |
| built-in types.</p> |
| |
| <p>Types without a no-arg constructor are not supported by the <code>ReflectionBasedAutoSerializer</code>. This |
| includes all user defined structs. <code>System.Data.Datatable</code> is an example of a system class that is not |
| supported due to lack of a no-arg constructor.</p> |
| |
| <h2 id="java-interoperability-with-.net-specific-types"><a id="auto-ser-java-interop"></a>Java Interoperability with .NET Specific Types</h2> |
| |
| <p>Java does not have unsigned data types or exact equivalents of <code>Guid</code> and <code>Decimal</code>. Care should be |
| taken when passing these types between .NET and Java applications using the .NET |
| <code>ReflectionBasedAutoSerializer</code>. For example, if storing <code>UInt16</code> data (that is, 16-bit unsigned values), |
| be aware that values greater than <code>UInt16.MaxValue/2 - 1</code> will show up as negative numbers in |
| Java. Using that data in a Java application may have unexpected behavior. If you expect to exceed |
| half the range for the given type (<code>Byte.MaxValue/2</code>, <code>UInt16.MaxValue/2</code>, <code>UInt32.MaxValue/2</code>, or |
| <code>UInt64.MaxValue/2</code>) you should use the next larger type. This obviously breaks down for |
| <code>UInt64</code>, which has no next larger type. However, if your range exceeds <code>UIn64.MaxValue/2</code>, you likely |
| have a much more complex set of issues to deal with, such as heavy paging due to such a large data |
| set.</p> |
| |
| <h2 id="remote-queries-of-.net-only-types"><a id="auto-ser-remote-queries"></a>Remote Queries of .NET Only Types</h2> |
| |
| <p>At this time the .NET Client does not support queries against user classes that have been stored on |
| the server using the <code>ReflectionBasedAutoSerializer</code>.</p> |
| |
| <p>When you register the reflection-based serializer, Geode uses it to serialize all |
| objects that do not implement <code>IPdxSerializable</code>. You can customize the |
| auto-serialization behavior for your domain objects by adding serialization attributes to your |
| object’s fields.</p> |
| |
| <h2 id="extending-the-pdx-autoserializer"><a id='pdx-ser-extending-auto'></a>Extending the PDX Autoserializer</h2> |
| |
| <p>For each object you intend to have autoserialized, you can customize the serialization as needed.</p> |
| |
| <p><strong>Note:</strong> If you also use PDX serialization in Java for the object, customize your serialization in the same way for both languages.</p> |
| |
| <p>The following extension methods apply to autoserialization:</p> |
| |
| <ul> |
| <li> <strong>WriteTransform</strong>. Controls what field value is written during auto serialization.</li> |
| <li> <strong>ReadTransform</strong>. Controls what field value is read during auto deserialization.</li> |
| <li> <strong>GetFieldType</strong>. Defines the specific field names that will be generated during autoserialization.</li> |
| <li> <strong>IsIdentityField</strong>. Controls which field is marked as the identity field. Identity fields are used when a <code>PdxInstance</code> computes its hash code to determine whether it is equal to another object.</li> |
| <li> <strong>GetFieldType</strong>. Determines the field type that will be used when autoserializing the given field.</li> |
| <li> <strong>IsFieldIncluded</strong>. Specifies which fields of a class to autoserialize.</li> |
| </ul> |
| |
| <p>To specify an identifier field in your domain object, add the attribute <code>PdxIdentityField</code> to the field.</p> |
| |
| <p>For example:</p> |
| <pre class="highlight csharp"><code><span class="na">[PdxIdentityField]</span> <span class="k">private</span> <span class="kt">int</span> <span class="n">id</span><span class="p">;</span> |
| </code></pre> |
| |
| <p>To exclude a field from serialization, add the .NET attribute <code>NonSerialized</code> to the field.</p> |
| |
| <p>For example:</p> |
| <pre class="highlight csharp"><code><span class="na">[NonSerialized]</span> <span class="k">private</span> <span class="kt">int</span> <span class="n">myLocalData</span><span class="p">;</span> |
| </code></pre> |
| |
| <p>For each domain class Geode serializes using the autoserializer, all fields are |
| considered for serialization except those defined as <code>static</code>, <code>literal</code> or <code>readonly</code> and those you |
| explicitly exclude using the .NET <code>NonSerialized</code> attribute.</p> |
| |
| <p>This example code demonstrates how to extend the autoserializer to customize serialization.</p> |
| <pre class="highlight csharp"><code><span class="k">public</span> <span class="k">class</span> <span class="nc">AutoSerializerEx</span> <span class="p">:</span> <span class="n">ReflectionBasedAutoSerializer</span> |
| <span class="p">{</span> |
| <span class="k">public</span> <span class="k">override</span> <span class="kt">object</span> <span class="nf">WriteTransform</span><span class="p">(</span><span class="n">FieldInfo</span> <span class="n">fi</span><span class="p">,</span> <span class="n">Type</span> <span class="n">type</span><span class="p">,</span> <span class="kt">object</span> <span class="n">originalValue</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">FieldType</span><span class="p">.</span><span class="nf">Equals</span><span class="p">(</span><span class="n">Type</span><span class="p">.</span><span class="nf">GetType</span><span class="p">(</span><span class="s">"System.Guid"</span><span class="p">)))</span> <span class="p">{</span> |
| <span class="k">return</span> <span class="n">originalValue</span><span class="p">.</span><span class="nf">ToString</span><span class="p">();</span> |
| <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">FieldType</span><span class="p">.</span><span class="nf">Equals</span><span class="p">(</span><span class="n">Type</span><span class="p">.</span><span class="nf">GetType</span><span class="p">(</span><span class="s">"System.Decimal"</span><span class="p">)))</span> <span class="p">{</span> |
| <span class="k">return</span> <span class="n">originalValue</span><span class="p">.</span><span class="nf">ToString</span><span class="p">();</span> |
| <span class="p">}</span> <span class="k">else</span> |
| <span class="k">return</span> <span class="k">base</span><span class="p">.</span><span class="nf">WriteTransform</span><span class="p">(</span><span class="n">fi</span><span class="p">,</span> <span class="n">type</span><span class="p">,</span> <span class="n">originalValue</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="k">public</span> <span class="k">override</span> <span class="kt">object</span> <span class="nf">ReadTransform</span><span class="p">(</span><span class="n">FieldInfo</span> <span class="n">fi</span><span class="p">,</span> <span class="n">Type</span> <span class="n">type</span><span class="p">,</span> <span class="kt">object</span> <span class="n">serializeValue</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">FieldType</span><span class="p">.</span><span class="nf">Equals</span><span class="p">(</span><span class="n">Type</span><span class="p">.</span><span class="nf">GetType</span><span class="p">(</span><span class="s">"System.Guid"</span><span class="p">)))</span> <span class="p">{</span> |
| <span class="n">Guid</span> <span class="n">g</span> <span class="p">=</span> <span class="k">new</span> <span class="nf">Guid</span><span class="p">((</span><span class="kt">string</span><span class="p">)</span><span class="n">serializeValue</span><span class="p">);</span> |
| <span class="k">return</span> <span class="n">g</span><span class="p">;</span> |
| <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">FieldType</span><span class="p">.</span><span class="nf">Equals</span><span class="p">(</span><span class="n">Type</span><span class="p">.</span><span class="nf">GetType</span><span class="p">(</span><span class="s">"System.Decimal"</span><span class="p">)))</span> <span class="p">{</span> |
| <span class="k">return</span> <span class="n">Convert</span><span class="p">.</span><span class="nf">ToDecimal</span><span class="p">((</span><span class="kt">string</span><span class="p">)</span><span class="n">serializeValue</span><span class="p">);</span> |
| <span class="p">}</span> <span class="k">else</span> |
| <span class="k">return</span> <span class="k">base</span><span class="p">.</span><span class="nf">ReadTransform</span><span class="p">(</span><span class="n">fi</span><span class="p">,</span> <span class="n">type</span><span class="p">,</span> <span class="n">serializeValue</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="k">public</span> <span class="k">override</span> <span class="n">FieldType</span> <span class="nf">GetFieldType</span><span class="p">(</span><span class="n">FieldInfo</span> <span class="n">fi</span><span class="p">,</span> <span class="n">Type</span> <span class="n">type</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">FieldType</span><span class="p">.</span><span class="nf">Equals</span><span class="p">(</span><span class="n">Type</span><span class="p">.</span><span class="nf">GetType</span><span class="p">(</span><span class="s">"System.Guid"</span><span class="p">))</span> <span class="p">||</span> |
| <span class="n">fi</span><span class="p">.</span><span class="n">FieldType</span><span class="p">.</span><span class="nf">Equals</span><span class="p">(</span><span class="n">Type</span><span class="p">.</span><span class="nf">GetType</span><span class="p">(</span><span class="s">"System.Decimal"</span><span class="p">)))</span> |
| <span class="k">return</span> <span class="n">FieldType</span><span class="p">.</span><span class="n">STRING</span><span class="p">;</span> |
| <span class="k">return</span> <span class="k">base</span><span class="p">.</span><span class="nf">GetFieldType</span><span class="p">(</span><span class="n">fi</span><span class="p">,</span> <span class="n">type</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="k">public</span> <span class="k">override</span> <span class="kt">bool</span> <span class="nf">IsIdentityField</span><span class="p">(</span><span class="n">FieldInfo</span> <span class="n">fi</span><span class="p">,</span> <span class="n">Type</span> <span class="n">type</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">Name</span> <span class="p">==</span> <span class="s">"_identityField"</span><span class="p">)</span> |
| <span class="k">return</span> <span class="k">true</span><span class="p">;</span> |
| <span class="k">return</span> <span class="k">base</span><span class="p">.</span><span class="nf">IsIdentityField</span><span class="p">(</span><span class="n">fi</span><span class="p">,</span> <span class="n">type</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="k">public</span> <span class="k">override</span> <span class="kt">string</span> <span class="nf">GetFieldName</span><span class="p">(</span><span class="n">FieldInfo</span> <span class="n">fi</span><span class="p">,</span> <span class="n">Type</span> <span class="n">type</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">Name</span> <span class="p">==</span> <span class="s">"_nameChange"</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">fi</span><span class="p">.</span><span class="n">Name</span> <span class="p">+</span> <span class="s">"NewName"</span><span class="p">;</span> |
| <span class="k">return</span> <span class="n">fi</span><span class="p">.</span><span class="n">Name</span><span class="p">;</span> |
| <span class="p">}</span> |
| |
| <span class="k">public</span> <span class="k">override</span> <span class="kt">bool</span> <span class="nf">IsFieldIncluded</span><span class="p">(</span><span class="n">FieldInfo</span> <span class="n">fi</span><span class="p">,</span> <span class="n">Type</span> <span class="n">type</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">Name</span> <span class="p">==</span> <span class="s">"_notInclude"</span><span class="p">)</span> |
| <span class="k">return</span> <span class="k">false</span><span class="p">;</span> |
| <span class="k">return</span> <span class="k">base</span><span class="p">.</span><span class="nf">IsFieldIncluded</span><span class="p">(</span><span class="n">fi</span><span class="p">,</span> <span class="n">type</span><span class="p">);</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| </code></pre> |
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