tomcat 7 源码分析-7 server初始化中的JMX(DynamicMBean)再续

tomcat 7 源码分析-7 server初始化中的JMX(DynamicMBean)再续

 

这里说下tomcat对DynamicMBean的实现和封装。利用tomcat包，可以轻松实现将自己的对象注册为MBeans。

看个例子就明白了。

package
 com.MBean.test;

import
 org.apache.tomcat.util.modeler.BaseNotificationBroadcaster;

public
 
class
 DyMBeanObj 
extends
 BaseNotificationBroadcaster{

    public
 
int
 getConnectionNumber() {
        return
 
this
.conNum ;
        }

        public
 
synchronized
 
void
 setConnectionNumber(
int
 con_Num ) {

        this
.conNum = con_Num ;

        System.out.println("Connection Number now "
 + 
this
.conNum );
        }
        private
 
int
 conNum = DEFAULT_CON_Num;
        private
 
static
 
final
 
int
 DEFAULT_CON_Num= 
20
;

}

package com.MBean.test;

import org.apache.tomcat.util.modeler.BaseNotificationBroadcaster;

public class DyMBeanObj extends BaseNotificationBroadcaster{
	
    public int getConnectionNumber() { 
    	return this.conNum ; 
        } 
     
        public synchronized void setConnectionNumber(int con_Num ) {

    	this.conNum = con_Num ; 
     
    	System.out.println("Connection Number now " + this.conNum ); 
        } 
        private int conNum = DEFAULT_CON_Num;
        private static final int DEFAULT_CON_Num= 20; 

}

 

package
 com.MBean.test;
import
 javax.management.*;

import
 org.apache.tomcat.util.modeler.Registry;

public
 
class
 DyMBeanTest {

    /**
     * @param args
     */
    public
 
static
 
void
 main(String[] args) 
throws
 Exception{
        // TODO Auto-generated method stub
        DyMBeanObj obj = new
 DyMBeanObj();
//将这个Object-->动态MBean
        ObjectName on = null
;
        on = new
 ObjectName(
"com.MBeans:type=test"
);
//此MBean的域和类型
        Registry.getRegistry(null
, 
null
).registerComponent(obj, on, 
null
);
        System.out.println("Waiting for incoming requests..."
);
        Thread.sleep(Long.MAX_VALUE);
    }

}

package com.MBean.test;
import javax.management.*;

import org.apache.tomcat.util.modeler.Registry;

public class DyMBeanTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception{
		// TODO Auto-generated method stub
		DyMBeanObj obj = new DyMBeanObj();//将这个Object-->动态MBean
		ObjectName on = null;
		on = new ObjectName("com.MBeans:type=test");//此MBean的域和类型		
		Registry.getRegistry(null, null).registerComponent(obj, on, null);	
		System.out.println("Waiting for incoming requests...");  
		Thread.sleep(Long.MAX_VALUE);  
	}

}

 查看运行效果，可以直接看上篇文章。

 

不管是DynamicMBean还是StandardMBean，都需要ObjectName，可以利用一串字符构造这个对象。

”com.MBeans:type=test“，其实就是Domain:key=value

 

Registry大大简化了DynamicMBean的调用，讲MBeanServer的create也封装了。