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einari committed Feb 29, 2024
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44 changes: 17 additions & 27 deletions _posts/2007/05/crossappdomainsingleton-update/index.md
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- "csharp"
---

I forgot a couple of very essential things in my [last post about a singleton that lives across appdomains](http://ingebrigtsen.blog/2007/05/18/cross-appdomain-singleton/).
I forgot a couple of very essential things in my [last post about a singleton that lives across appdomains](/2007/05/18/cross-appdomain-singleton/).

When accessing a remote object using remoting, like I did with the singleton implementation, the remoting system obtains a lease for the object. The lease period is implemented in the MarshalByRefObject class through a method called InitializeLifeTimeService(). A singleton like the one we wanted to achieve needs to live forever, therefor you need to override the InitializeLifeTimeService() method and always return null. Returning null means that it should live forever (more details can be at [http://msdn.microsoft.com/msdnmag/issues/03/12/LeaseManager/default.aspx](http://msdn.microsoft.com/msdnmag/issues/03/12/LeaseManager/default.aspx))
When accessing a remote object using remoting, like I did with the singleton implementation, the remoting system obtains a lease for the object. The lease period is implemented in the MarshalByRefObject class through a method called InitializeLifeTimeService(). A singleton like the one we wanted to achieve needs to live forever, therefor you need to override the InitializeLifeTimeService() method and always return null. Returning null means that it should live forever (more details can be found [here](http://msdn.microsoft.com/msdnmag/issues/03/12/LeaseManager/default.aspx))

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13</pre></td><td class=""><pre style="margin:0;padding:2px 2px 2px 8px;"><span style="font-weight:normal;font-size:11px;color:black;font-family:Courier New;background-color:transparent;">&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">/// &lt;summary&gt;</span>
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">/// Override of lifetime service initialization.</span>
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">/// </span>
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">/// The reason for overriding is to have this singleton live forever</span>
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">/// &lt;/summary&gt;</span>
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">/// &lt;returns&gt;object for the lease period - in our case always null&lt;/returns&gt;</span>
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">public</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">override</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">object</span> InitializeLifetimeService()
&nbsp;&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">// We want this singleton to live forever</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">// In order to have the lease across appdomains live forever,</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:green;font-family:Courier New;background-color:transparent;">// we return null.</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">return</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">null</span>;
&nbsp;&nbsp;&nbsp;&nbsp;}</span></pre></td></tr></tbody></table>
```csharp
/// <summary>
/// Override of lifetime service initialization.
///
/// The reason for overriding is to have this singleton live forever
/// </summary>
/// <returns>object for the lease period - in our case always null</returns>
public override object InitializeLifetimeService()
{
// We want this singleton to live forever
// In order to have the lease across appdomains live forever,
// we return null.
return null;
}
```

In addition I've made it all threadsafe. So look at the attachment for this post instead..

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152 changes: 52 additions & 100 deletions ...2007/07/community-server-module-for-embedding-silverlight-1-1-to-posts/index.md
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Expand Up @@ -14,106 +14,58 @@ It all started up yesterday as a simple thing, but I figured that I didn't feel

The module code turns out as follows (I've attached the entire project with source and binaries)

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</pre></td><td><pre style="margin:0;padding:2px 2px 2px 8px;"><span style="font-weight:normal;font-size:11px;color:black;font-family:Courier New;background-color:transparent;">&nbsp;&nbsp;[Module(<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"SilverlightModule"</span>)]
&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">public</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">class</span> SilverlightModule : BaseModule
&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">private</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">static</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">readonly</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> SilverlightScript <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span> <span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"Silverlight"</span>;
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">private</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">static</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">readonly</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> SilverlightApplicationScript <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"SilverlightApplication"</span>;
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;[Method(MethodType.PreRender)]
&nbsp;&nbsp;&nbsp;&nbsp;[MethodType(MethodType.PreRender)]
&nbsp;&nbsp;&nbsp;&nbsp;[ApplicationType(ApplicationType.Weblog)]
&nbsp;&nbsp;&nbsp;&nbsp;[ApplicationType(ApplicationType.ContentManagement)]
&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">public</span> <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> Render(<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> protocol,<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> xamlUri)
&nbsp;&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> completeUri <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span> protocol <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span> <span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">":"</span> <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span> xamlUri;
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Page page <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span> MethodContext.Current.Page;
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">if</span> (!page.ClientScript.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IsClientScriptBlockRegistered(SilverlightScript))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;page.ClientScript.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RegisterClientScriptBlock(&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">typeof</span>(SilverlightModule),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SilverlightScript,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resources.Silverlight, <span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">true</span>);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">if</span> (!page.ClientScript.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IsClientScriptBlockRegistered(SilverlightApplicationScript))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;page.ClientScript.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RegisterClientScriptBlock(&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">typeof</span>(SilverlightModule),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SilverlightApplicationScript,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resources.SilverlightApplication,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">true</span>);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Guid applicationGuid <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span> Guid.NewGuid();
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">string</span> hostName <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span> <span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"SilverlightControlHost_"</span>+applicationGuid.ToString();
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;completeUri <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">=</span> completeUri.Trim();
<div></div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:blue;font-family:Courier New;background-color:transparent;">return</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:#6 0;font-family:Courier New;background-color:#e4e4e4;">"&lt;div id=""</span> <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span> hostName <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span> <span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"" style="background-color:Black" &gt;"</span> <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"&lt;script type="text/javascript" style="background-color:Black"&gt;"</span> <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"createSilverlight(""</span>+completeUri+<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"",""</span>+applicationGuid.ToString()<span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span><span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"");"</span> <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"&lt;/script&gt;"</span> <span style="font-weight:normal;font-size:11px;color:red;font-family:Courier New;background-color:transparent;">+</span>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-weight:normal;font-size:11px;color:#666666;font-family:Courier New;background-color:#e4e4e4;">"&lt;/div&gt;"</span>;
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;}</span></pre></td></tr></tbody></table>
```csharp
[Module("SilverlightModule")]
public class SilverlightModule : BaseModule
{
private static readonly string SilverlightScript = "Silverlight";
private static readonly string SilverlightApplicationScript =
"SilverlightApplication";

[Method(MethodType.PreRender)]
[MethodType(MethodType.PreRender)]
[ApplicationType(ApplicationType.Weblog)]
[ApplicationType(ApplicationType.ContentManagement)]
public string Render(string protocol,string xamlUri)
{
string completeUri = protocol + ":" + xamlUri;

Page page = MethodContext.Current.Page;

if (!page.ClientScript.
IsClientScriptBlockRegistered(SilverlightScript))
{
page.ClientScript.
RegisterClientScriptBlock( typeof(SilverlightModule),
SilverlightScript,
Resources.Silverlight, true);
}

if (!page.ClientScript.
IsClientScriptBlockRegistered(SilverlightApplicationScript))
{
page.ClientScript.
RegisterClientScriptBlock( typeof(SilverlightModule),
SilverlightApplicationScript,
Resources.SilverlightApplication,
true);
}

Guid applicationGuid = Guid.NewGuid();

string hostName = "SilverlightControlHost_"+applicationGuid.ToString();

completeUri = completeUri.Trim();

return
"<div id="" + hostName + "" style="background-color:Black" >" +
"<script type="text/javascript" style="background-color:Black">" +
"createSilverlight(""+completeUri+"",""+applicationGuid.ToString()+"");" +
"</script>" +
"</div>";
}
}
```

![CommunityServermoduleforembeddi.1toposts_780E_image_1](images/CommunityServermoduleforembeddi.1toposts_780E_image_1.png)

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