Simulating AOP injection with domain events

Jiedao jdon 2021-05-04 14:52:46
simulating aop injection domain events


Welcome to watch KylinORM Series articles :

Chapter one : Use Tag Network maintains entity relationship

Second articles : Based on business driven domain services

Third articles : Use domain event simulation AOP Inject

Use AOP Weaving domain objects makes it easy to cascade load 、 data verification 、 cache 、 Log and other functions , You don't have to put the code in the base class of domain objects or warehouse objects .


Use AOP Creating domain objects dynamically Proxy example , And implement the specified interface as needed .


unfortunately AOP(.NET) Must be used at runtime IL Bytecode dynamically creates classes , Or let the target object inherit ContextBoundObject. Is there a simpler way ? Look at this code :

public class OrderInfo
{
public IAspectMapper<OrderInfo> Mapper; // Register entity mapper 
public OrderInfo()
{
this.Mapper = AspectMapper.Inject(this, "OrderID") // Inject entities and intercept domain events 
.Before(MapperEvent.EntityCreate, Validator.Validate) // Call permission control module before entity creation. 
.AfterReturning(MapperEvent.EntityCreate, Logger.Log); // After the entity is created, the system log module is called. 
}
}
<p>

OrderInfo It's a normal entity (POCO), Declare a mapper in the entity for administration OrderInfo Association with other entities . And then use Before Interceptor interception EntityCreate event , Use AfterReturning Interceptor interception EntityCreate event .

When creating an entity 、 to update 、 Delete and so on , The data layer first checks the interceptors registered on the entity mapper , Call the relevant response method , According to the return value of the method, decide whether to perform the real operation .


The response to the incident Logger.Log Any number of overloads can be specified , The event source should automatically match the most appropriate method according to the entity and operation information .

public class Logger
{
public static void Log(OrderInfo sender, AfterReturningEventArgs e)
{
//e.EventType Entity operations to respond to 
if (e.EventType == MapperEvent.EntityCreate)
Debug.WriteLine(string.Format(" Order {0} Created ", sender.OrderNo));
}
public static void Log(object sender, AfterReturningEventArgs e)
{
Debug.WriteLine(" test ");
}
}
<p>

Data mapper can proxy any operation of any object , Just put the operation TargetClass.DO Change to AspjectManager.Invoke(TargetClass.DO) that will do . stay Invoke Before AspjectManager Will check the TargetClass.Mapper Interceptors registered on .

Although we need to POCO Object to register a small property , But this is not the cost and dynamic type 、 Inheriting base classes is trivial .

For examples and documentation, see http://www.kylinorm.org/

[ The quilt gameboyLV On 2012-04-10 23:19 A modified ]

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本文为[Jiedao jdon]所创,转载请带上原文链接,感谢
https://javamana.com/2021/05/20210504144409713q.html

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