Spring 2.x jmx 及应用（2）mbean注册方式

spring提供了灵活的MBean方式
除了之前介绍过的Annotation

还有Metadata方式，类似于Annotation
这种方式在创建javadoc时候会给予警告但不会影响doc的创建

package com.xmlasia.spring.test.jmx;

/**
 * @@org.springframework.jmx.export.metadata.ManagedResource 
 * (description="My Managed Bean",objectName="spring:bean=test")
 *
 */
public class CommentMBeanManager {
	private int clientStatus;

	/**
	 * @@org.springframework.jmx.export.metadata.ManagedOperation 
	 * (description="pause a single proccess")
	 * 
	 */
	public void pause(String n) {
		System.out.println("pause");
	}

	/**
	 * @@org.springframework.jmx.export.metadata.ManagedOperation 
	 * (description="shut down the proccess")
	 */
	public void monitor() {
		System.out.println("shutting down...");
	}

	public void publicMessage() {
		System.out.println("publicMessage");
	}

	/**
	 * @@org.springframework.jmx.export.metadata.ManagedAttribute 
	 * (description="client status")
	 */
	public int getClientStatus() {
		return clientStatus;
	}

	public void setClientStatus(int clientStatus) {
		this.clientStatus = clientStatus;
	}
}

使用这种方式需要改变attributeSource的实现类

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 

http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

	<!-- mbean -->
	<bean id="mbeanManager"
		class="com.xmlasia.spring.test.jmx.CommentMBeanManager" />


	<!-- JMX configuration -->
	<bean id="mbeanServer"
		class="org.springframework.jmx.support.MBeanServerFactoryBean">
	</bean>

	<!-- 注意这里将更换为AttributesJmxAttributeSource -->
	<bean id="attributeSource"
               class="org.springframework.jmx.export.metadata.AttributesJmxAttributeSource">
		<property name="attributes">
			<bean
			class="org.springframework.metadata.commons.CommonsAttributes" />
		</property>
	</bean>

	<bean id="assembler"
		class="org.springframework.jmx.export.assembler.MetadataMBeanInfoAssembler">
		<property name="attributeSource" ref="attributeSource" />
	</bean>

	<bean id="mBeanExporter"
		class="org.springframework.jmx.export.MBeanExporter">
		<property name="server" ref="mbeanServer" />
		<property name="assembler" ref="assembler" />
		 <property name="beans">  
            <!-- 将mbean注册到mBeanExporter -->
            <map>
            	<entry key="mbean:name=testBean"
            		value-ref="mbeanManager" />
            </map>
		 </property>  
	</bean>
</beans>

其他照旧不需修改

如果你有很多mbean spring也提供了很好的解决方法
你只需在修改mBeanExporter的属性autodetect=true

<bean id="mBeanExporter"
		class="org.springframework.jmx.export.MBeanExporter">
		<property name="server" ref="mbeanServer" />
		<property name="assembler" ref="assembler" />
		<property name="autodetect" value="true" />
	</bean>

spring会搜索context中所有被ManagedResource标记的mbean自动进行注册


另一种方式类似于标准的jmx mbean实现，用interface来定义将要暴露的Attribute和Operation

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 

http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

	<!-- mbean -->
	<bean id="mbeanManager"
		class="com.xmlasia.spring.test.jmx.CommentMBeanManager" />


	<!-- JMX configuration -->
	<bean id="mbeanServer"
		class="org.springframework.jmx.support.MBeanServerFactoryBean">
	</bean>

	<!--使用接口来描述mbean-->
	<bean id="assembler"
                class="org.springframework.jmx.export.assembler.InterfaceBasedMBeanInfoAssembler">
		<property name="managedInterfaces">
			<value>
				com.xmlasia.spring.test.jmx.ICommentMBeanManager
			</value>
		</property>
	</bean>

	<bean id="mBeanExporter"
		class="org.springframework.jmx.export.MBeanExporter">
		<property name="server" ref="mbeanServer" />
		<property name="assembler" ref="assembler" />
		<property name="beans">
			<!-- 将mbean注册到mBeanExporter -->
			<map>
				<entry key="mbean:name=testBean"
					value-ref="mbeanManager" />
			</map>
		</property>
	</bean>
</beans>

我们可以通过refactor快速的将CommentMBeanManager的方法和属性抽取到ICommentMBeanManager中。
注意managedInterfaces是一个Class[]的类型不用担心很多接口的问题。

最后注册mbean是有3种行为的分别是
REGISTRATION_FAIL_ON_EXISTING mbean已经存在将会抛出InstanceAlreadyExistsException异常
REGISTRATION_IGNORE_EXISTING 忽视后来注册的mbean
REGISTRATION_REPLACE_EXISTING 覆盖掉之前注册的mbean
通过MBeanExporter的registrationBehaviorName属性进行设定

 <bean id="mBeanExporter" class="org.springframework.jmx.export.MBeanExporter">  
        <property name="server" ref="mbeanServer"/>  
        <property name="assembler" ref="assembler"/>   
        <property name="registrationBehaviorName" value="REGISTRATION_REPLACE_EXISTING"/> 
    </bean>  

同样用jconsole进行测试

要了解springjmx前还是要需要掌握jdk对jmx定义，jmx在维护application方法是有很好的应用的。
继续挖掘中