如何在Spring.NET中使用DefaultAdvisorAutoProxyCreator定义线程范围的对象

时间:2012-02-15 04:21:40

标签: aop spring.net spring-aop interception

我想使用DefaultAdvisorAutoProxyCreator创建一个线程局部对象(带有拦截器)。我知道如何使用ProxyFactoryObject:

<?xml version="1.0" encoding="utf-8"?>
<objects xmlns="http://www.springframework.net">
    <object id="ConsoleLoggingBeforeAdvisor" type="Spring.Aop.Support.DefaultPointcutAdvisor" singleton="false">
        <property name="Advice">
            <object type="Spring.Examples.AopQuickStart.ConsoleLoggingBeforeAdvice"/>
        </property>
    </object>
    <object id="ServiceCommandTargetSource" type="Spring.Aop.Target.ThreadLocalTargetSource">
        <property name="TargetObjectName" value="ServiceCommandTarget"/>
   </object>
    <object id="ServiceCommandTarget" type="Spring.Examples.AopQuickStart.ServiceCommand" singleton="false"/>
    <object name="ServiceCommand" type="Spring.Aop.Framework.ProxyFactoryObject">
        <property name="TargetSource" ref="ServiceCommandTargetSource"/>
        <property name="InterceptorNames">
            <list>
                <value>ConsoleLoggingBeforeAdvisor</value>
            </list>
        </property>
    </object>
</objects>

但是,我不知道如何使用DefaultAdvisorAopCreator获得相同的效果。这是我尝试过的(但没有奏效):

<?xml version="1.0" encoding="utf-8"?>
<objects xmlns="http://www.springframework.net">
    <object id="ConsoleLoggingBeforeAdvisor" type="Spring.Aop.Support.DefaultPointcutAdvisor" singleton="false">
        <property name="Advice">
            <object type="Spring.Examples.AopQuickStart.ConsoleLoggingBeforeAdvice"/>
        </property>
    </object>
    <object id="ServiceCommand" type="Spring.Examples.AopQuickStart.ServiceCommand" singleton="false"/>
    <object type="Spring.Aop.Framework.AutoProxy.DefaultAdvisorAutoProxyCreator">
        <property name="CustomTargetSourceCreators">
            <list element-type="Spring.Aop.Framework.AutoProxy.ITargetSourceCreator">
                <object id="ThreadLocalTargetSourceCreator" type="Spring.Examples.AopQuickStart.ThreadLocalTargetSourceCreator"/>
            </list>
        </property>
    </object>
</objects>

ThreadLocalTargetSourceCreator是一个无条件返回ThreadLocalTargetSource实例的自定义类:

namespace Spring.Examples.AopQuickStart {
    public class ThreadLocalTargetSourceCreator : AbstractPrototypeTargetSourceCreator {
        protected override AbstractPrototypeTargetSource CreatePrototypeTargetSource(Type objectType, string name, IObjectFactory factory) {
            return new ThreadLocalTargetSource();
        }
    }
}

因此,总而言之,当我使用第一个配置(使用ProxyFactoryObject)从Spring.NET请求ServiceCommand时,每个线程只获得一个对象实例(正确的行为)。但是,使用第二个配置(DefaultAdvisorAutoProxyCreator),我每次都会获得一个新实例(不正确的行为;期望每个线程有一个实例)。

有什么想法吗?

2 个答案:

答案 0 :(得分:0)

未经测试,但尝试此(或类似的东西):

protected override AbstractPrototypeTargetSource CreatePrototypeTargetSource(Type objectType, string name, IObjectFactory factory) {
  ThreadLocalTargetSource ts = new ThreadLocalTargetSource();
  ts.TargetObjectName = name;
  ts.ObjectFactory = factory;
  return ts;
}

答案 1 :(得分:0)

好的,我发现为什么它没有按预期工作。看起来很傻,我正在从AbstractPrototypeTargetSourceCreator.GetTargetSource()创建并返回ThreadLocalTargetSource的新实例。当然,ThreadLocalTargetSource的每个新实例都不知道之前由其“堂兄弟”创建的任何现有目标实例,因此每次请求实例时它都会创建其目标的新实例。

分辨率非常简单。我刚刚更新了ITargetSourceCreator的实现,以确保它创建了ThreadLocalTargetSource的单个实例,并在每次调用AbstractPrototypeTargetSourceCreator.GetTargetSource()时返回该实例:

namespace Spring.Examples.AopQuickStart {
    public class ThreadLocalTargetSourceCreator : AbstractPrototypeTargetSourceCreator {
        private readonly ThreadLocalTargetSource _threadLocalTargetSource;

        public ThreadLocalTargetSourceCreator() {
            _threadLocalTargetSource = new ThreadLocalTargetSource();
        }

        protected override AbstractPrototypeTargetSource CreatePrototypeTargetSource(Type objectType, string name, IObjectFactory factory) {
            return _threadLocalTargetSource;
        }
    }
}

使用此代码,它对我来说非常有效,并且我获得了代理对象的线程本地生命时间。