bboss aop 实践（3）构造函数依赖注入

bboss-aop-1.0.5，下载地址： https://sourceforge.net/project/showfiles.php?group_id=238653&package_id=290546&release_id=658454

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系列文章的前两篇介绍bboss aop框架的配置文件语法和属性依赖注入功能，本篇介绍bboss aop框架的构造函数依赖注入功能。

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构造函数注入业务组件的属性值是bboss aop框架提供的另一种依赖注入的方法，这种方法可以通过以下三种方式注入业务组件的属性：

l???????? 常量方式注入

l???????? 给定属性对应类型名称，由框架实时构建该类型的实例

l???????? 引用已有的其他业务组件

这一节详细介绍这种依赖注入法。

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准备工作，定义一个带有构造函数的业务组件

l???????? 组件接口

public interface ConstructorInf {

???

??? public void testHelloworld();

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}

l???????? 组件实现

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public class ConstructorImpl implements ConstructorInf {

??? private String message;//验证常量方式注入

??? private AI ai;// 引用已有的其他业务组件

??? private Test test;// 给定属性对应类型名称，由框架实时构建该类型的实例

??? public ConstructorImpl(String message,AI ai,Test test)//依赖注入的构造函数

??? {

?????? this.message = message;

?????? this.ai = ai;

?????? this.test = test;

??? }

???

??? public ConstructorImpl() //默认的构造函数

??? {

?????? this.message = message;

?????? this.ai = ai;

??? }

??? public void testHelloworld() { //业务方法

??????

?????? System.out.println(message);

?????? System.out.println(ai);

??? }

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}

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准备后组件之后，编写bboss aop框架的业务组件配置文件manager-constructor.xml

内容如下：

<?xml version="1.0" encoding='gb2312'?>

<manager-config>

??? <manager id="constructor.a"

?????? singlable="true">

?????? <provider type="A" default="true"

?????????? class="com.chinacreator.spi.constructor.ConstructorImpl" />???

?????? <construction>???

?????????? <param value="hello world"/>

?????????? <param refid="interceptor.a"/>

?????????? <param type="com.chinacreator.spi.constructor.Test"/>

?????? </construction>

??? </manager>

</manager-config>

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将manager-constructor.xml文件存储在classes下的包com.chinacreator.spi.constructor目录下，

再将manager-constructor.xml配置在主文件manager-provider.xml(该文件在classes根目录下)中：

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<manager-config>

??? ... ...???

??? <managerimport file="com/chinacreator/spi/interceptor/manager-interceptor.xml" />??

??? <managerimport file="com/chinacreator/spi/constructor/manager-constructor.xml" />

??? ... ...

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</manager-config>

其中引用的业务组件"interceptor.a"

<param refid="interceptor.a"/>

配置在拦截器实例配置文件manager-interceptor.xml中：

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<manager-config>

??? <manager id="interceptor.a"

?????? singlable="true">

?????? <provider type="A" default="true"

?????????? class="com.chinacreator.spi.interceptor.A" />

?????? <!-- against the loop ioc rules,because constructor.a reference interceptor.a -->

?????? <!-- <reference fieldname="const" refid="constructor.a"/>-->

??????

?????? <synchronize enabled="true">

?????????? <method name="testInterceptorsBeforeafterWithTX"/>

?????????? <method name="testInterceptorsBeforeAfter"/>

?????????? <method name="testInterceptorsBeforeThrowing"/>?

?????????? <method name="testInterceptorsBeforeThrowingWithTX">

?????????? </method>????

?????? </synchronize>

?????? <interceptor class="com.chinacreator.spi.interceptor.Insterceptor"/>

?????? <interceptor class="com.chinacreator.spi.interceptor.Insterceptor1"/>

??????

?????? <!--?

?????????? 在下面的节点对provider的业务方法事务进行定义

?????????? 只要将需要进行事务控制的方法配置在transactions中即可

?????? -->

?????? <transactions>

?????????? <method name="testInterceptorsBeforeafterWithTX"/>

?????????? <method name="testInterceptorsBeforeAfter"/>

?????????? <method name="testInterceptorsBeforeThrowing"/>?

?????????? <method name="testInterceptorsBeforeThrowingWithTX">

?????????????

?????????? </method>????????

?????? </transactions>

??? </manager>

</manager-config>

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配置完毕后，使用业务组件

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import com.chinacreator.spi.BaseSPIManager;

import com.chinacreator.spi.SPIException;

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public class TestConstructor {

??? public static void testConstructor()

??? {

?????? try {

?????????? ConstructorInf a = (ConstructorInf)BaseSPIManager.getProvider("constructor.a");

??????

????????????? a.testHelloworld();

??????????

??????????

?????? } catch (SPIException e) {

?????????? // TODO Auto-generated catch block

?????????? e.printStackTrace();

??????????

?????? }

??? }

???

??? public static void main(String[] args)

??? {

?????? testConstructor();

??? }

}