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<h1>Event Registry API</h1><script>
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<p>External callbacks should be registered with db4o
EventRegistry. Follow the steps below to start using your own event handlers:</p>
<ol>
<li>Obtain an
instance of EventRegistry object for your ObjectContainer
</p>
<span name="cs_wiki_filter" csw_filters="cs">
<p>c#:</p>
<p><code>IEventRegistry registry =
EventRegistryFactory.ForObjectContainer(container);</code> </p>
</span>
<span name="cs_wiki_filter" csw_filters="cs">
<p>VB:</p>
<p><code>Dim registry As IEventRegistry =
EventRegistryFactory.ForObjectContainer(container)</code></p>
</span>
</li>
<li>Register the required event. For "created" event the code is the following:
<span name="cs_wiki_filter" csw_filters="cs">
<p>c#:</p>
<p><code>registry.Created += new ObjectEventHandler(OnCreated);</code></p>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<p>VB:</p>
<p><code>AddHandler registry.Created, AddressOf OnCreated</code></p>
</span>
</li>
<li>Create your own event handler:
<span name="cs_wiki_filter" csw_filters="cs">
<p>c#: </p>
<p><code>private static void OnCreated(object sender, ObjectEventArgs args)<br> {<br>
// handling code
<br> }</code></p>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<p>VB: </p>
<p><code>Private Shared Sub OnCreated(ByVal sender As Object, ByVal args As ObjectEventArgs)<br>
' handling code<br>End Sub</code></p>
</span>
<p>The action raised the event can be cancelled in Creating,
Activating, Deactivating, Updating and Deleting event handlers. These events accept CancellableObjectEventArgs as a parameter. In order to cancel the action use:</p>
<span name="cs_wiki_filter" csw_filters="cs">
<p>c#:<br></p>
<p><code>cancellableEventArgs.Cancel()</code></p>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<p>VB:</p>
<p><code>cancellableEventArgs.Cancel()</code></p>
</span>
<p>Here <code>cancellableEventArgs</code> is an event argument of <code>CancellableObjectEventArgs</code> type.</p>
<span name="cs_wiki_filter" csw_filters="cs">
<p>c#:</p>
<p><code>registry.Created -= new ObjectEventHandler(OnCreated);</code></p>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<p>VB:</p>
<p><code>RemoveHandler registry.Created, AddressOf OnCreated</code></p>
</span>
</li>
</ol>
<p>EventRegistry features:</p>
<ul>
<li>You can register several event handlers for a single
event. </li>
<li>You can get different EventRegistry's for different
ObjectContainer instances using EventRegistryFactory. </li>
<li>In Java, callbacks are implemented as Listeners, .NET
uses Native events </li>
<li>Callbacks only work run in
local mode or on the server side in client/server mode. </li>
<li>Each event applies to all the objects or
queries(QueryStarted/QueryFinished events ). In order to distinguish the
specific case, to which the handler should be applied, use the event arguments.
</li>
</ul>
<p>For example:</p>
<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">CallbacksExample.cs: <span class="fscMemberName">TestCreated</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61"><div><!--
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--><span style="color: #008080;">01</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> TestCreated()
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Open_Text').style.display='inline';"/> </span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_42_660_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> File.Delete(Db4oFileName);
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IObjectContainer container </span><span style="color: #000000;">=</span><span style="color: #000000;"> OpenContainer();
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">try</span><span style="color: #000000;">
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Open_Text').style.display='inline';"/> </span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_169_568_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IEventRegistry registry </span><span style="color: #000000;">=</span><span style="color: #000000;"> EventRegistryFactory.ForObjectContainer(container);
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #008000;">//</span><span style="color: #008000;"> register an event handler, which will print all the car objects, that have been Created</span><span style="color: #008000;">
</span><span style="color: #008080;">09</span><span style="color: #008000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/></span><span style="color: #000000;"> registry.Created </span><span style="color: #000000;">+=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> ObjectEventHandler(OnCreated);
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Car car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">"</span><span style="color: #800000;">Rubens Barrichello</span><span style="color: #800000;">"</span><span style="color: #000000;">));
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Set(car);
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> }</span></span><span style="color: #000000;">
</span><span style="color: #008080;">14</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">finally</span><span style="color: #000000;">
</span><span style="color: #008080;">15</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Open_Text').style.display='inline';"/> </span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksCS.ZipsCallbacksExample.Cs_CallbacksExample.Cs_TestCreated_3301_61_601_650_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">16</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> CloseContainer();
</span><span style="color: #008080;">17</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> }</span></span><span style="color: #000000;">
</span><span style="color: #008080;">18</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">CallbacksExample.vb: <span class="fscMemberName">TestCreated</span></span></div><div class="fscCode"><pre ID="ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61"><div><!--
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--><span style="color: #008080;">01</span><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub TestCreated()</span><span id="ResourcesReferenceImplementation_StrategiesCallbackscallbacksVB.ZipsCallbacksExample.Vb_CallbacksExample.Vb_TestCreated_3428_61_15_624_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> TestCreated()
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> File.Delete(Db4oFileName)
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> container </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer </span><span style="color: #000000;">=</span><span style="color: #000000;"> OpenContainer
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Try</span><span style="color: #000000;">
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> registry </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IEventRegistry </span><span style="color: #000000;">=</span><span style="color: #000000;"> EventRegistryFactory.ForObjectContainer(container)
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #008000;">'</span><span style="color: #008000;"> register an event handler, which will print all the car objects, that have been Created</span><span style="color: #008000;">
</span><span style="color: #008080;">07</span><span style="color: #008000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/></span><span style="color: #000000;"> </span><span style="color: #0000FF;">AddHandler</span><span style="color: #000000;"> registry.Created, </span><span style="color: #0000FF;">AddressOf</span><span style="color: #000000;"> OnCreated
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> car </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">"</span><span style="color: #800000;">Rubens Barrichello</span><span style="color: #800000;">"</span><span style="color: #000000;">))
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Set(car)
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Finally</span><span style="color: #000000;">
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> CloseContainer()
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">End</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Try</span><span style="color: #000000;">
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
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This revision (11) was last Modified 2007-04-28T09:39:20 by Tetyana.
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