- mvcdemo.zip
- MvcDemo
- MvcDeme.Core
- MvcDemo.Common
- MvcDemo.Dal
- MvcDemo.sln
- MvcDemo.suo
- MvcDemo.Tests
- App.config
- bin
- Debug
- AutoMapper.dll
- log4net.dll
- Microsoft.Practices.ServiceLocation.dll
- Microsoft.Practices.Unity.dll
- Microsoft.Practices.Unity.pdb
- Microsoft.Practices.Unity.xml
- MvcDemo.Common.dll
- MvcDemo.Common.pdb
- MvcDemo.Core.dll
- MvcDemo.Core.pdb
- MvcDemo.Dal.dll
- MvcDemo.Dal.pdb
- MvcDemo.dll
- MvcDemo.pdb
- MvcDemo.Tests.dll
- MvcDemo.Tests.dll.config
- MvcDemo.Tests.pdb
- Controllers
- MvcDemo.Tests.csproj
- obj
- Debug
- Properties
- MvcDemo
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Data.Objects;
using System.Web;
using System.Threading;
using MvcDemo.Dal.EntityModels;
namespace MvcDemo.Dal.Infrastructure
{
/// <summary>
/// Manages the lifecycle of the EF's object context
/// </summary>
/// <remarks>Uses a context per http request approach or one per thread in non web applications</remarks>
public static class ContextManager
{
#region Private Members
// accessed via lock(_threadObjectContexts), only required for multi threaded non web applications
private static readonly Hashtable _threadObjectContexts = new Hashtable();
#endregion
public static IObjectSet<T> GetObjectSet<T>(T entity, string contextKey)
where T : class
{
return GetObjectContext(contextKey).CreateObjectSet<T>();
}
/// <summary>
/// Returns the active object context
/// </summary>
public static ObjectContext GetObjectContext(string contextKey)
{
ObjectContext objectContext = GetCurrentObjectContext(contextKey);
if (objectContext == null) // create and store the object context
{
objectContext = new DmsEntities();
StoreCurrentObjectContext(objectContext, contextKey);
}
return objectContext;
}
/// <summary>
/// Gets the repository context
/// </summary>
/// <returns>An object representing the repository context</returns>
public static object GetRepositoryContext(string contextKey)
{
return GetObjectContext(contextKey);
}
/// <summary>
/// Sets the repository context
/// </summary>
/// <param name="repositoryContext">An object representing the repository context</param>
public static void SetRepositoryContext(object repositoryContext, string contextKey)
{
if (repositoryContext == null)
{
RemoveCurrentObjectContext(contextKey);
}
else if (repositoryContext is ObjectContext)
{
StoreCurrentObjectContext((ObjectContext)repositoryContext, contextKey);
}
}
#region Object Context Lifecycle Management
/// <summary>
/// gets the current object context
/// </summary>
private static ObjectContext GetCurrentObjectContext(string contextKey)
{
ObjectContext objectContext = null;
if (HttpContext.Current == null)
objectContext = GetCurrentThreadObjectContext(contextKey);
else
objectContext = GetCurrentHttpContextObjectContext(contextKey);
return objectContext;
}
/// <summary>
/// sets the current session
/// </summary>
private static void StoreCurrentObjectContext(ObjectContext objectContext, string contextKey)
{
if (HttpContext.Current == null)
StoreCurrentThreadObjectContext(objectContext, contextKey);
else
StoreCurrentHttpContextObjectContext(objectContext, contextKey);
}
/// <summary>
/// remove current object context
/// </summary>
private static void RemoveCurrentObjectContext(string contextKey)
{
if (HttpContext.Current == null)
RemoveCurrentThreadObjectContext(contextKey);
else
RemoveCurrentHttpContextObjectContext(contextKey);
}
#region private methods - HttpContext related
/// <summary>
/// gets the object context for the current thread
/// </summary>
private static ObjectContext GetCurrentHttpContextObjectContext(string contextKey)
{
ObjectContext objectContext = null;
if (HttpContext.Current.Items.Contains(contextKey))
objectContext = (ObjectContext)HttpContext.Current.Items[contextKey];
return objectContext;
}
private static void StoreCurrentHttpContextObjectContext(ObjectContext objectContext, string contextKey)
{
if (HttpContext.Current.Items.Contains(contextKey))
HttpContext.Current.Items[contextKey] = objectContext;
else
HttpContext.Current.Items.Add(contextKey, objectContext);
}
/// <summary>
/// remove the session for the currennt HttpContext
/// </summary>
private static void RemoveCurrentHttpContextObjectContext(string contextKey)
{
ObjectContext objectContext = GetCurrentHttpContextObjectContext(contextKey);
if (objectContext != null)
{
HttpContext.Current.Items.Remove(contextKey);
objectContext.Dispose();
}
}
#endregion
#region private methods - ThreadContext related
/// <summary>
/// gets the session for the current thread
/// </summary>
private static ObjectContext GetCurrentThreadObjectContext(string contextKey)
{
ObjectContext objectContext = null;
Thread threadCurrent = Thread.CurrentThread;
if (threadCurrent.Name == null)
threadCurrent.Name = contextKey;
else
{
object threadObjectContext = null;
lock (_threadObjectContexts.SyncRoot)
{
threadObjectContext = _threadObjectContexts[contextKey];
}
if (threadObjectContext != null)
objectContext = (ObjectContext)threadObjectContext;
}
return objectContext;
}
private static void StoreCurrentThreadObjectContext(ObjectContext objectContext, string contextKey)
{
lock (_threadObjectContexts.SyncRoot)
{
if (_threadObjectContexts.Contains(contextKey))
_threadObjectContexts[contextKey] = objectContext;
else
_threadObjectContexts.Add(contextKey, objectContext);
}
}
private static void RemoveCurrentThreadObjectContext(string contextKey)
{
lock (_threadObjectContexts.SyncRoot)
{
if (_threadObjectContexts.Contains(contextKey))
{
ObjectContext objectContext = (ObjectContext)_threadObjectContexts[contextKey];
if (objectContext != null)
{
objectContext.Dispose();
}
_threadObjectContexts.Remove(contextKey);
}
}
}
/*
private static string BuildContextThreadName()
{
return Thread.CurrentThread.Name;
}
private static string BuildHttpContextName()
{
return OBJECT_CONTEXT_KEY;
}*/
#endregion
#endregion
}
}
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