IMEI我是MXbeans的新手。我想了解MXBean实际初始化的时间，在我支持的应用程序中，我们有一个通知系统，在有一些通知到达之前我无法在JConsole中看到我的MXBean。这是我的MXBean的代码。
package mecomaany.instrumentation;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.AttributeNotFoundException;
import javax.management.DynamicMBean;
import javax.management.InvalidAttributeValueException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import BulkCMIRP_MxBean;
import SoapIRPLogger;
/**
* This dynamic MBean exposes a method to return the 10 latest Basic CM
* operations.
*
* @author eshtrom
*
*/
public class BasicCMIRP_MxBean implements DynamicMBean{
private static final String CLASS_NAME = BasicCMIRP_MxBean.class.getCanonicalName();
private static final String MX_BEAN_NAME = BasicCMIRP_MxBean.class.getCanonicalName() + ":Type=BasicCMIRP_MxBean";
private static final String BEAN_DESCRIPTION = "Instrumentation bean for SOAP Basic CM IRP.";
private static final int NUM_OPERATIONS_TO_RECORD = 10;
private final ArrayList<String> basicCMOperations = new ArrayList<String>();
/**
* Register the bean. This is a best effort attempt. If registration fails
* we'll report it but nothing more.
*/
public BasicCMIRP_MxBean() {
registerMxBean();
}
/**
* Attempt to unregister and clean up the MX beans.
*/
public void destroy() {
basicCMOperations.clear();
unregisterMxBean();
}
/**
* This method returns a description of this bean to the JMX interface. The
* description is just a list of names of the currently stored attributes.
*/
public synchronized MBeanInfo getMBeanInfo() {
final MBeanAttributeInfo[] attributes = new MBeanAttributeInfo[0];
final MBeanOperationInfo[] operations = { new MBeanOperationInfo("getBasicCMInstrumentation", "Get instrumentation Basic CM IRP bean.", null, "String[]",
MBeanOperationInfo.INFO) };
return new MBeanInfo(this.getClass().getName(), BEAN_DESCRIPTION, attributes, null, operations, null);
}
/**
* Callback to execute methods exposed by this dynamic MBean.
*/
public Object invoke(final String actionName, final Object[] params, final String[] signature) throws MBeanException, ReflectionException {
SoapIRPLogger.enter(CLASS_NAME, "invoke");
if (actionName != null) {
if (actionName.equals("getBulkCMInstrumentation")) {
return getBasicCMInstrumentation();
}
}
SoapIRPLogger.exit(CLASS_NAME, "invoke");
throw new ReflectionException(new NoSuchMethodException(actionName));
}
/**
* Construct a human readable very of the last 10 operations and return it.
*
* @return string array as an object.
*/
private Object getBasicCMInstrumentation() {
SoapIRPLogger.enter(CLASS_NAME, "getBasicCMInstrumentation");
String[] result = new String[basicCMOperations.size()];
int index = 0;
for (String operation : basicCMOperations) {
result[index] = operation;
index++;
}
SoapIRPLogger.exit(CLASS_NAME, "getBasicCMInstrumentation");
return result;
}
/**
* No attributes are writable so this method will throw an exception.
*/
public void setAttribute(final Attribute arg0) throws AttributeNotFoundException, InvalidAttributeValueException, MBeanException, ReflectionException {
throw new AttributeNotFoundException("All attributes on this bean are read only.");
}
/**
* No attributes are writable so this method will return an empty list.
*/
public AttributeList setAttributes(final AttributeList arg0) {
return new AttributeList();
}
public Object getAttribute(final String attribute) throws AttributeNotFoundException, MBeanException, ReflectionException {
throw new AttributeNotFoundException("No attributes are defined on this MX bean.");
}
/**
* No attributes are readable so this method will return an empty list.
*/
public AttributeList getAttributes(final String[] attributes) {
return new AttributeList();
}
/**
* Add or update and instrumentation attribute. A null attribute name will
* be ignored.
*
* @param name
* @param value
*/
public void updateInstrumentationAttibute(final String name, final String value) {
// The only attribute that this bean supports is Bulk CM operations.
if (name.compareTo("BasicCM_Operations") == 0) {
basicCMOperations.add(value);
// We'll only record a maximum of 10 operations. If we exceed the
// max, remove the oldest.
if (basicCMOperations.size() > NUM_OPERATIONS_TO_RECORD) {
basicCMOperations.remove(0);
}
}
}
public ObjectName getBeanName() throws MalformedObjectNameException, NullPointerException {
// Construct the ObjectName for the MBean we will register
return new ObjectName(MX_BEAN_NAME);
}
/**
* Register the bean.
*/
protected void registerMxBean() {
try {
ManagementFactory.getPlatformMBeanServer().registerMBean(this, this.getBeanName());
} catch (Exception e) {
SoapIRPLogger.exception(CLASS_NAME, "Constructor", "Failed to register BulkCMIRP_MxBean management beans.", e);
}
}
protected void unregisterMxBean() {
try {
ManagementFactory.getPlatformMBeanServer().unregisterMBean(this.getBeanName());
} catch (Exception e) {
// Suppress exceptions, we're closing down anyway.
}
}
}
答案 0 :(得分：0)
孤独者;
一旦构造它，您的MXBean应该在JConsole中可见，因为构造函数调用 registerMxBean（），它将MBean注册到平台MBeanServer。
假设您的JConsole在注册MBean时已经在运行，JConsole的MBean视图将由注册时生成的MBeanInfo的第一个实例决定。由于您将其编码为 DynamicMBean ，我想知道您的意图是定期修改MBeanInfo，但请注意，一旦JConsole连接检索到已注册bean的MBeanInfo，它就不会刷新它。如果MBeanInfo更改，则必须在JConsole中关闭连接并再次打开它。
因此，您的问题可能在您提供的代码之外，或者更简单地说，是什么时候创建 BasicCMIRP_MxBean 的实例？
关于在通知开始到达之前没有看到bean的评论让我想知道你的意思是： A.在通知开始到达之前，您无法看到MBean，在这种情况下，我会假设有一些激活代码在[第一个？]通知到达时创建实例，或者 B.您的意思是，在通知开始到达之前，您无法看到MBean的特定属性。
也许你可以在这里澄清更大的图片。
可能不相关的一些其他观察结果：
//尼古拉斯