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@PNergard

PNergard/Singleton.cs

Last active Apr 18, 2016
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Singleton page- and blocktypes. A attribute and initializationmodule that limits page and block types to only be created once. http://world.episerver.com/blogs/Per-Nergard/Dates/2016/4/limit-block-and-page-types-to-be-created-only-once-updated/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace AlloyDemoKit.Business.DataAnnotations
{
public class Singleton : Attribute
{
}
}
using System;
using EPiServer;
using EPiServer.Core;
using EPiServer.DataAbstraction;
using EPiServer.Framework;
using EPiServer.Framework.Initialization;
using EPiServer.ServiceLocation;
using AlloyDemoKit.Business.DataAnnotations;
namespace AlloyDemoKit.Business.Initialization.CreateTypeOnlyOnce
{
[InitializableModule]
public class SingletonTypeInitialzableModule : IInitializableModule
{
public void Initialize(InitializationEngine context)
{
DataFactory.Instance.CreatedContent += Instance_CreatedContent;
DataFactory.Instance.DeletedContent += Instance_DeletedContent;
}
public void Preload(string[] parameters) { }
public void Uninitialize(InitializationEngine context)
{
DataFactory.Instance.CreatedContent -= Instance_CreatedContent; ;
DataFactory.Instance.DeletedContent -= Instance_DeletedContent;
}
void Instance_CreatedContent(object sender, ContentEventArgs e)
{
var repository = ServiceLocator.Current.GetInstance<IContentTypeRepository>();
if (repository != null)
{
var contentType = repository.Load(e.Content.ContentTypeID);
Attribute[] attributes = Attribute.GetCustomAttributes(contentType.ModelType);
foreach (var attr in attributes)
{
if (attr is Singleton)
{
var writableContentType = (ContentType)contentType.CreateWritableClone();
writableContentType.IsAvailable = false;
repository.Save(writableContentType);
}
}
}
}
void Instance_DeletedContent(object sender, DeleteContentEventArgs e)
{
var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
var contentTyperepository = ServiceLocator.Current.GetInstance<IContentTypeRepository>();
foreach (ContentReference cr in e.DeletedDescendents)
{
var content = contentRepository.Get<IContent>(cr);
if (content != null)
{
var contentType = contentTyperepository.Load(content.ContentTypeID);
System.Attribute[] attributes = System.Attribute.GetCustomAttributes(contentType.ModelType);
foreach (var attr in attributes)
{
if (attr is Singleton)
{
var writableContentType = (ContentType)contentType.CreateWritableClone();
writableContentType.IsAvailable = true;
contentTyperepository.Save(writableContentType);
}
}
}
}
}
}
}
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