Two applications of AOP (second)

Two applications of AOP: Entity set Update (dateentitylistupdate), deferred loading (lazyload) (bottom)

Lazyloadablesink class

//*******************************************************************
Module: Implementing deferred Load Message sinks
Date: 2009-9-19 14:08:58
Author: Faib
Copyrights: Copyright Faib Studio 2009
Official website: http://www.faib.net.cn
Email: faib920@126.com
Note:
//*******************************************************************
Using System;
Using System.Reflection;
Using System.Runtime.Remoting.Messaging;
Using FaibClass.Data.Operation;
Namespace FaibClass.Data.Aspect
{
<summary>
Implements a deferred load message sink.
</summary>
Internal class Lazyloadablesink:imessagesink
{
Private IMessageSink M_nextsink;
Private MarshalByRefObject M_target;
private static Object syncRoot = new Object ();
Public Lazyloadablesink (MarshalByRefObject target, IMessageSink nextsink)
{
Lock (SyncRoot)
{
M_target = target;
M_nextsink = Nextsink;
}
}
Public IMessage SyncProcessMessage (IMessage msg)
{
IMethodReturnMessage Returnedmessage;
Handlemessage (msg, FALSE, out returnedmessage);
return returnedmessage;
}
Public Imessagectrl asyncprocessmessage (IMessage msg, IMessageSink Replysink)
{
IMethodReturnMessage Returnedmessage;
Handlemessage (MSG, True, out returnedmessage);
Return M_nextsink.asyncprocessmessage (msg, replysink);
}
Public IMessageSink Nextsink
{
get {return m_nextsink;}
}
<summary>
Process messages
</summary>
<param name= "MSG" ></param>
<param name= "IsAsync" ></param>
<param name= "Returnedmessage" ></param>
private void Handlemessage (IMessage msg, bool IsAsync, out IMethodReturnMessage returnedmessage)
{
Returnedmessage = null;
if (! IsAsync)
{
if (msg is IMethodCallMessage)
{
Type EntityType = M_target. GetType ();
IMethodCallMessage MCM = (imethodcallmessage) msg;
BOOL Isfill = (bool) entitytype.getproperty ("Innerisfill", BindingFlags.Instance | BindingFlags.NonPublic). GetValue (m_target, NULL);
To determine whether to get a property or field or call the GetValue method
BOOL Isproperty =!isfill && (MCM. Methodname.length > 4 &&
McM. Methodname.substring (0, 4) = = "get_" && MCM. MethodName!= "Get_innerisfill" &&
McM.　MethodName!= "Get_innerdatastate") | | McM. MethodName = = "Fieldgetter" | |
McM. MethodName = = "GetValue");
Object oldvalue = null;
MemberInfo minfo = null;
Property Name Field Name
String propertyname = String. Empty;
if (Isproperty)
{
Field
if (MCM). MethodName = = "Fieldgetter")
PropertyName = MCM. INARGS[1]. ToString ();
GetValue method
else if (MCM. MethodName = = "GetValue")
PropertyName = MCM. Inargs[0]. ToString ();
Property
Else
PropertyName = MCM. Methodname.replace ("get_", "");
Minfo = Utility.getmember (m_target. GetType (), PropertyName);
if (Minfo = null)
Isproperty = false;
Determines whether a child entity set, reference entity, reference property
else if (!minfo. IsDefined (typeof (Subentitylistattribute), true) &&
!minfo. IsDefined (typeof (Referenceentityattribute), true) &&
!minfo. IsDefined (typeof (Referencepropertyattribute), true)
Isproperty = false;
if (Isproperty)
OldValue = Utility.getmembervalue (M_target, Minfo, PropertyName);
Read the database when the value is empty
if (isproperty && oldvalue = null)
{
Remove the cached Action object
String key = Datacachekeymanager.getentityinnerdata (EntityType);
Object innerdata = Innercache<object[]>. Get (key);
if (innerdata!= null)
{
Construct the Action object
Object[] _innerdata = (object[]) innerdata;
Datahelper data = (datahelper) activator.createinstance ((Type) _innerdata[0]);
if (string. IsNullOrEmpty (data. ConnectionString))
Data. ConnectionString = _innerdata[1]. ToString ();
Operationargs Operargs = new Operationargs (data);
QueryBuilder query = new QueryBuilder (data. Createparameters ());
Child entity set
if (minfo. IsDefined (typeof (Subentitylistattribute), true)
{
Subentitylistattribute Keyattribute = Datamappingmanager.getsubentitylistkey (EntityType, propertyName);
if (Keyattribute!= null)
{
Idataentitylist list = (idataentitylist) activator.createinstance (Keyattribute.entitylisttype);
Type Refentitytype = list. Modeltype;
Take primary key value
Object value = ((dataentity) m_target). GetValue (Keyattribute.primarykey);
if (value!= null)
{
Association relationship
Query. Append (querycompare.equal, Keyattribute.foreignkey, value);
if (!string. IsNullOrEmpty (keyattribute.condition))
{
Query. Append (Queryrelation.and, keyattribute.condition);
}
Querying entity Sets
List = Selectoperator.select (Operargs, refentitytype, query, NULL, NULL);
Returnedmessage = new ReturnMessage (list, NULL, 0, NULL, MCM);
((dataentity) m_target). SetValue (PropertyName, Returnedmessage.returnvalue);
}
}
}
Referencing entities
else if (minfo. IsDefined (typeof (Referenceentityattribute), true)
{
Referenceentityattribute Keyattribute = Datamappingmanager.getreferenceentitykey (EntityType, propertyName);
Take primary key value
Object value = ((dataentity) m_target). GetValue (Keyattribute.foreignkey);
if (value!= null)
{
Association relationship
Query. Append (querycompare.equal, Keyattribute.primarykey, value);
Object result = Getoperator.get (Operargs, keyattribute.referencetype, query, NULL, NULL);
Returnedmessage = new ReturnMessage (result, NULL, 0, NULL, MCM);
((dataentity) m_target). SetValue (PropertyName, Returnedmessage.returnvalue);
}
}
Referencing properties
else if (minfo. IsDefined (typeof (Referencepropertyattribute), true)
{
Referencepropertyattribute Keyattribute = Datamappingmanager.getreferencepropertykey (EntityType, propertyName);
Take primary key value
Object value = ((dataentity) m_target). GetValue (Keyattribute.foreignkey);
if (value!= null)
{
Association relationship
Query. Append (querycompare.equal, Keyattribute.primarykey, value);
Dataentity entity1 = Getoperator.get (Operargs, keyattribute.referencetype, query, NULL, NULL);
if (entity1!= null)
{
Object result = Entity1. GetValue ((Keyattribute as Referencepropertyattribute). Referencepropertyname);
Returnedmessage = new ReturnMessage (result, NULL, 0, NULL, MCM);
((dataentity) m_target). SetValue ((Keyattribute as Ikeyattribute). property, result);
}
}
}
Data. Dispose ();
}
}
}
}
if (returnedmessage = null)
Returnedmessage = (imethodreturnmessage) m_nextsink.syncprocessmessage (msg);
}
Else
{
Returnedmessage = null;
}
}
}
}