org.apache.log4j.jmx.AbstractDynamicMBean Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of activemq-osgi Show documentation
Puts together an ActiveMQ OSGi bundle
There is a newer version: 6.1.4
/*
 * 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.util.Enumeration;
import java.util.Iterator;
import java.util.Vector;

import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.DynamicMBean;
import javax.management.InstanceAlreadyExistsException;
import javax.management.InstanceNotFoundException;
import javax.management.JMException;
import javax.management.MBeanRegistration;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import javax.management.RuntimeOperationsException;

import org.apache.log4j.Logger;
import org.apache.log4j.Appender;

public abstract class AbstractDynamicMBean implements DynamicMBean,
                                                      MBeanRegistration {

  String dClassName;
  MBeanServer server;
  private final Vector mbeanList = new Vector();

    /**
     * Get MBean name.
     * @param appender appender, may not be null.
     * @return name.
     * @since 1.2.16
     */
  static protected String getAppenderName(final Appender appender){
      String name = appender.getName();
      if (name == null || name.trim().length() == 0) {
          // try to get some form of a name, because null is not allowed (exception), and empty string certainly isn't useful in JMX..
          name = appender.toString();
      }
      return name;
  }
      

  /**
   * 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