?? abstractdynamicmbean.java
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/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.apache.log4j.jmx;//import java.lang.reflect.Constructor;import java.util.Iterator;import javax.management.DynamicMBean;import javax.management.AttributeList;import javax.management.Attribute;import javax.management.RuntimeOperationsException;import javax.management.MBeanRegistration;import javax.management.MBeanServer;import javax.management.ObjectName;import org.apache.log4j.Logger;public abstract class AbstractDynamicMBean implements DynamicMBean, MBeanRegistration { MBeanServer server; /** * Enables the to get the values of several attributes of the Dynamic MBean. */ public AttributeList getAttributes(String[] attributeNames) { // Check attributeNames is not null to avoid NullPointerException later on if (attributeNames == null) { throw new RuntimeOperationsException( new IllegalArgumentException("attributeNames[] cannot be null"), "Cannot invoke a getter of " + dClassName); } AttributeList resultList = new AttributeList(); // if attributeNames is empty, return an empty result list if (attributeNames.length == 0) return resultList; // build the result attribute list for (int i=0 ; i<attributeNames.length ; i++){ try { Object value = getAttribute((String) attributeNames[i]); resultList.add(new Attribute(attributeNames[i],value)); } catch (Exception e) { e.printStackTrace(); } } return(resultList); } /** * Sets the values of several attributes of the Dynamic MBean, and returns the * list of attributes that have been set. */ public AttributeList setAttributes(AttributeList attributes) { // Check attributes is not null to avoid NullPointerException later on if (attributes == null) { throw new RuntimeOperationsException( new IllegalArgumentException("AttributeList attributes cannot be null"), "Cannot invoke a setter of " + dClassName); } 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); } protected abstract Logger getLogger(); public void postDeregister() { getLogger().debug("postDeregister is called."); } public void postRegister(java.lang.Boolean registrationDone) { } public void preDeregister() { getLogger().debug("preDeregister called."); } public ObjectName preRegister(MBeanServer server, ObjectName name) { getLogger().debug("preRegister called. Server="+server+ ", name="+name); this.server = server; return name; }}
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