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POWhen is JMXBean initialised
 

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  1. POWhen is JMXBean initialised
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    <p>IMEI I am new to MXbeans. I want to understand when is the MXBean actually initialized, in the application which I am supporting we have a notification system and I can not see my MXBean in JConsole until there is some notification arriving. Here is a code of my MXBean.</p> <pre><code> 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&lt;String&gt; basicCMOperations = new ArrayList&lt;String&gt;(); /** * 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() &gt; 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. } } } </code></pre>
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    1. USLoner shushman
    1. USLoner shushman
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    1. COyes you right, I have just written this code so at them moment it is not yet part of the company's repository, but you right
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      1. POWhen is JMXBean initialised
      1. USLoner shushman
    2. COGentleman, what about the question . Can you explain me how the initialisation works?
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      1. POWhen is JMXBean initialised
      1. USLoner shushman
 

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