import java.lang.reflect.Constructor;
import java.util.Iterator;
import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.DynamicMBean;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import javax.management.ReflectionException;
/**
* @author Sunny Peng
* @author change by Chen.Gang, add a feature for dynamic add operation
* @version 1.0
*/
public class HelloDynamic implements DynamicMBean {
//這是我們的屬性名稱(chēng)
private String name;
private MBeanInfo mBeanInfo = null;
private String className;
private String description;
private MBeanAttributeInfo[] attributes;
private MBeanConstructorInfo[] constructors;
private MBeanOperationInfo[] operations;
MBeanNotificationInfo[] mBeanNotificationInfoArray;
public HelloDynamic() {
init();
buildDynamicMBean();
} private void init() {
className = this.getClass().getName();
description = "Simple implementation of a dynamic MBean.";
attributes = new MBeanAttributeInfo[1];
constructors = new MBeanConstructorInfo[1];
operations = new MBeanOperationInfo[1];
mBeanNotificationInfoArray = new MBeanNotificationInfo[0];
} private void buildDynamicMBean() {
//設(shè)定構(gòu)造函數(shù)
Constructor[] thisconstructors = this.getClass().getConstructors();
constructors[0] = new MBeanConstructorInfo("HelloDynamic(): Constructs a HelloDynamic object", thisconstructors[0]);
//設(shè)定一個(gè)屬性
attributes[0] = new MBeanAttributeInfo("Name", "java.lang.String", "Name: name string.", true, true, false);
//operate method 我們的操作方法是print
MBeanParameterInfo[] params = null;//無(wú)參數(shù)
operations[0] = new MBeanOperationInfo("print", "print(): print the name", params, "void", MBeanOperationInfo.INFO);
mBeanInfo = new MBeanInfo(className, description, attributes, constructors, operations, mBeanNotificationInfoArray);
} //動(dòng)態(tài)增加一個(gè)print1方法
private void dynamicAddOperation() {
init();
operations = new MBeanOperationInfo[2];//設(shè)定數(shù)組為兩個(gè)
buildDynamicMBean();
operations[1] = new MBeanOperationInfo("print1", "print1(): print the name", null, "void", MBeanOperationInfo.INFO);
mBeanInfo = new MBeanInfo(className, description, attributes, constructors, operations, mBeanNotificationInfoArray);
}
public Object getAttribute(String attribute_name) {
if (attribute_name != null)
return null;
if (attribute_name.equals("Name"))
return name;
return null;
} public void setAttribute(Attribute attribute) {
if (attribute == null)
return;
String Name = attribute.getName();
Object value = attribute.getValue();
try {
if (Name.equals("Name")) {
// if null value, try and see if the setter returns any exception
if (value == null) {
name = null;
// if non null value, make sure it is assignable to the attribute
} else if ((Class.forName("java.lang.String")).isAssignableFrom(value.getClass())) {
name = (String) value;
}
}
} catch (Exception e) {
e.printStackTrace();
}
} public AttributeList getAttributes(String[] attributeNames) {
if (attributeNames == null)
return null;
AttributeList resultList = new AttributeList();
// if attributeNames is empty, return an empty result list
if (attributeNames.length == 0)
return resultList;
for (int i = 0; i < attributeNames.length; i++) {
try {
Object value = getAttribute(attributeNames[i]);
resultList.add(new Attribute(attributeNames[i], value));
} catch (Exception e) {
e.printStackTrace();
}
}
return resultList;
} public AttributeList setAttributes(AttributeList attributes) {
if (attributes == null)
return null;
AttributeList resultList = new AttributeList();
// if attributeNames is empty, nothing more to do
if (attributes.isEmpty())
return resultList;
// for each attribute, try to set it and add to the result list if successfull
for (Iterator i = attributes.iterator(); i.hasNext();) {
Attribute attr = (Attribute) i.next();
try {
setAttribute(attr);
String name = attr.getName();
Object value = getAttribute(name);
resultList.add(new Attribute(name, value));
} catch (Exception e) {
e.printStackTrace();
}
}
return resultList;
} public Object invoke(String operationName, Object params[], String signature[]) throws MBeanException, ReflectionException {
// Check for a recognized operation name and call the corresponding operation
if (operationName.equals("print")) {
//具體實(shí)現(xiàn)我們的操作方法print
System.out.println("Hello, " + name + ", this is HellDynamic!");
dynamicAddOperation();
return null;
} else if (operationName.equals("print1")) {
System.out.println("這是動(dòng)態(tài)增加的一方法print1");
return null;
} else {
// unrecognized operation name:
throw new ReflectionException(new NoSuchMethodException(operationName), "Cannot find the operation " + operationName + " in " + className);
} }
public MBeanInfo getMBeanInfo() {
return mBeanInfo;
}
}