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resolved SPRNET-672 (support custom model persistence)

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eeichinger
2008-10-19 11:38:02 +00:00
parent e3b13def9a
commit f05fe4a509
13 changed files with 447 additions and 63 deletions
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57
doc/reference/src/web.xml
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@@ -1311,27 +1311,27 @@ class MyControl : Control, ISupportsWebDependencyInjection
each one:<orderedlist>
<listitem>
<para>When the page is initially loaded (<literal>IsPostback ==
false</literal>), the <literal>InitializeModel</literal> method is
false</literal>), the <literal>InitializeModel</literal>() method is
called which initializes the trip object by creating a new instance
and setting its properties to desired values. Right before the page
is rendered, <literal>the SaveModel</literal> method will be invoked
and whatever the value it returns will be stored within the HTTP
Session. Finally, on each postback, <literal>the LoadModel</literal>
method will be called and the value returned by the previous call to
<literal>SaveModel</literal> will be passed to it as an
argument.</para>
is rendered, <literal>the SaveModel</literal>() method will be
invoked and whatever the value it returns will be stored within the
HTTP Session. Finally, on each postback, <literal>the
LoadModel()</literal> method will be called and the value returned
by the previous call to <literal>SaveModel</literal> will be passed
to it as an argument.</para>
<para>In this particular case the implementation is very simple
because our whole model is just the <literal>trip</literal> object.
As such, <literal>SaveModel</literal> simply returns the
<literal>trip</literal> object and <literal>LoadModel</literal>
casts the <literal>savedModel</literal> argument to
As such, <literal>SaveModel</literal>() simply returns the
<literal>trip</literal> object and <literal>LoadModel()</literal>
casts the <literal>savedModel</literal>() argument to
<literal>Trip</literal> and assigns it to the
<literal>trip</literal> field within the page. In the more complex
scenarios, you will typically return a dictionary containing your
model objects from the <literal>SaveModel</literal> method, and read
the values from that dictionary within the
<literal>LoadModel</literal>.</para>
model objects from the <literal>SaveModel</literal>() method, and
read the values from that dictionary within the
<literal>LoadModel</literal>().</para>
</listitem>
<listitem>
@@ -1799,6 +1799,37 @@ protected override void InitializeDataBindings()
The Visual Studio Web Form Editor will of course complain about binding attributes because it doesn't know them. You can safely ignore those warnings.
</note>
</sect2>
<sect2>
<title>Customizing Model Persistence</title>
<para>As was already mentioned in the introduction to this chapter,
model management needs an application developer to override
<literal>InitializeModel()</literal>, <literal>SaveModel() </literal>and
<literal>LoadModel()</literal> for storing model information between
requests in the user's session. On web farms this of course storing
information in a user's session is not a good strategy. Thus it is
possible to choose another persistence strategy by setting a
Spring.Web.UI.Page's resp. Spring.Web.UI.UserControl's
ModelPersistenceMedium property:</para>
<para><programlisting language="myxml">&lt;object id="modelPersister" type="Sample.DatabaseModelPersistenceMedium, MyCode"/&gt;
&lt;object type="UserRegistration.aspx"&gt;
&lt;property name="ModelPersistenceMedium" ref="modelPersister"/&gt;
&lt;/object&gt;</programlisting>To implement any arbitrary persistence
strategy, one simply needs to implement the IModelPersistenceMedium
interface:</para>
<para><programlisting language="myxml">public interface IModelPersistenceMedium
{
// Load the model for the specified control context.
object LoadFromMedium( Control context );
// Save the specified model object.
void SaveToMedium( Control context, object modelToSave );
}</programlisting></para>
</sect2>
</sect1>
<sect1 xml:id="web-localization">