初探JMX

1.標準MBean:

實現了AAAMBean或AAAMXBean接口的普通類，AAA爲該類的類名。

public interface StandardMXBean {
	public String getName();
	public String getCity();
	public int getRank();
}

import java.lang.management.ManagementFactory;
import java.util.HashMap;
import java.util.Map;

import javax.management.Attribute;
import javax.management.InstanceAlreadyExistsException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;


public class Standard implements StandardMXBean {
	private Map<String,Attribute> attrs;
	public Standard(String name, String city, int rank) {
		super();
		attrs = new HashMap<String,Attribute>();
		attrs.put("name", new Attribute("name",name));
		attrs.put("city", new Attribute("city",city));
		attrs.put("rank", new Attribute("rank",rank));
	}
	public void start() {
		
		 final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
		    ObjectName name = getMBeanName("my_service", "my_name");
		    try {
		      mbs.registerMBean(this, name);
		      
		    } catch (InstanceAlreadyExistsException ie) {
		      ie.printStackTrace();
		    } catch (Exception e) {
		    	e.printStackTrace();
		    }
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Standard test = new Standard("馬刺","聖安東尼奧",2);
		test.start();
		int time = 0;
		while(true)
			try {
				System.out.println(++time+"秒... ...");
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}
	static private ObjectName getMBeanName(String serviceName, String nameName) {
	    ObjectName name = null;
	    String nameStr = "MBeanTest:service="+ serviceName +",name="+ nameName;
	    try {
	      name = new ObjectName(nameStr);
	    } catch (MalformedObjectNameException e) {
	      System.err.println("Error creating MBean object name: "+ nameStr);
	    }
	    return name;
	  }
	@Override
	public String getName() {
		return attrs.get("name").getValue().toString();
	}

	@Override
	public String getCity() {
		// TODO Auto-generated method stub
		return attrs.get("city").getValue().toString();
	}

	@Override
	public int getRank() {
		// TODO Auto-generated method stub
		return (int)attrs.get("rank").getValue();
	}
	
}

2.動態MBean:

實現DynamicMBean接口，方法getAttribute(),getAttributes(),getMBeanInfo()必須返回正確的內容。

import java.lang.management.ManagementFactory;
import java.util.HashMap;
import java.util.Map;

import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.AttributeNotFoundException;
import javax.management.DynamicMBean;
import javax.management.InstanceAlreadyExistsException;
import javax.management.InvalidAttributeValueException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;


public class MBeanTest implements DynamicMBean{
	private Map<String,Attribute> attrs;
	public MBeanTest(String name, String city, int rank) {
		super();
		attrs = new HashMap<String,Attribute>();
		attrs.put("name", new Attribute("name",name));
		attrs.put("city", new Attribute("city",city));
		attrs.put("rank", new Attribute("rank",rank));
	}
	public void start() {
		
		 final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
		    ObjectName name = getMBeanName("my_service", "my_name");
		    try {
		      mbs.registerMBean(this, name);
		      
		    } catch (InstanceAlreadyExistsException ie) {
		      ie.printStackTrace();
		    } catch (Exception e) {
		    	e.printStackTrace();
		    }
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		MBeanTest test = new MBeanTest("馬刺","聖安東尼奧",2);
		test.start();
		int time = 0;
		while(true)
			try {
				System.out.println(++time+"秒... ...");
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}
	static private ObjectName getMBeanName(String serviceName, String nameName) {
	    ObjectName name = null;
	    String nameStr = "MBeanTest:service="+ serviceName +",name="+ nameName;
	    try {
	      name = new ObjectName(nameStr);
	    } catch (MalformedObjectNameException e) {
	      System.err.println("Error creating MBean object name: "+ nameStr);
	    }
	    return name;
	  }
	@Override
	public Object getAttribute(String attribute)
			throws AttributeNotFoundException, MBeanException,
			ReflectionException {
		return attrs.get(attribute);
	}
	@Override
	public void setAttribute(Attribute attribute)
			throws AttributeNotFoundException, InvalidAttributeValueException,
			MBeanException, ReflectionException {
		// TODO Auto-generated method stub
		
	}
	@Override
	public AttributeList getAttributes(String[] attributes) {
		AttributeList attrList = new AttributeList();
		for(String key : attrs.keySet()) {
			attrList.add(attrs.get(key));
		}
		return attrList;
	}
	@Override
	public AttributeList setAttributes(AttributeList attributes) {
		return null;
	}
	@Override
	public Object invoke(String actionName, Object[] params, String[] signature)
			throws MBeanException, ReflectionException {
		return null;
	}
	@Override
	public MBeanInfo getMBeanInfo() {
		MBeanAttributeInfo[] mbinfo = new MBeanAttributeInfo[attrs.size()];
		int i = 0;
		for(String key : attrs.keySet())  {
			mbinfo[i ++ ] = new MBeanAttributeInfo(key, "some_type", "some_desc", true, false, false); 
		}
		return new MBeanInfo("some_name", "some_description", mbinfo, null, null, null);
	}

}