Java tutorial
/* * Licensed to the Sakai Foundation (SF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The SF 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.sakaiproject.kernel.loader.server.test; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.sakaiproject.kernel.loader.common.CommonObject; import java.lang.management.ManagementFactory; import javax.management.Descriptor; import javax.management.JMException; import javax.management.JMRuntimeException; import javax.management.MBeanServer; import javax.management.ObjectName; import javax.management.modelmbean.DescriptorSupport; import javax.management.modelmbean.InvalidTargetObjectTypeException; import javax.management.modelmbean.ModelMBeanAttributeInfo; import javax.management.modelmbean.ModelMBeanInfo; import javax.management.modelmbean.ModelMBeanInfoSupport; import javax.management.modelmbean.ModelMBeanOperationInfo; import javax.management.modelmbean.RequiredModelMBean; /** * A container to hold the shared classloader for webapps as a bean. */ public class DummySharedClassLoaderContainer implements CommonObject { /** * A logger. */ private static final Log LOG = LogFactory.getLog(DummySharedClassLoaderContainer.class); private ClassLoader sharedClassLoader; /** * Create a shared classloader object. * * @param kernel * the kernel to connect to. * @param shutdownService * the shutdown service. * @throws JMRuntimeException * @throws JMException * @throws InvalidTargetObjectTypeException */ public DummySharedClassLoaderContainer(ClassLoader classLoader) throws JMRuntimeException, JMException, InvalidTargetObjectTypeException { this.sharedClassLoader = classLoader; MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); RequiredModelMBean model = new RequiredModelMBean(createMBeanInfo()); model.setManagedResource(this, "objectReference"); ObjectName common = new ObjectName(CommonObject.MBEAN_COMMON + ".sharedclassloader"); mbs.registerMBean(model, common); } /** * Stop the classloader container, removing the MBean from the MBean server. * @see org.sakaiproject.kernel.api.RequiresStop#stop() */ public void stop() { try { MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); ObjectName common = new ObjectName(CommonObject.MBEAN_COMMON + ".sharedclassloader"); mbs.unregisterMBean(common); LOG.info("Shared Classloader Container stopped Ok"); } catch (JMException e) { LOG.info( "Cant stop the shared classloader bean, this will cause problems if the kernel is restarted in this jvm " + e.getMessage(), e); } } /** * Create the the MBean Info for the Shared ClassLoader so that the methods * and properties are accessible via JMX. * * @return a new MBeanInfo structure */ private ModelMBeanInfo createMBeanInfo() { Descriptor sharedClassLoader = new DescriptorSupport( new String[] { "name=SharedClassLoader", "descriptorType=attribute", "default=null", "displayName=Shared Class Loader", "getMethod=getManagedObject" }); ModelMBeanAttributeInfo[] mmbai = new ModelMBeanAttributeInfo[1]; mmbai[0] = new ModelMBeanAttributeInfo("SharedClassLoader", ClassLoader.class.getName(), "Shared Class Loader", true, false, false, sharedClassLoader); ModelMBeanOperationInfo[] mmboi = new ModelMBeanOperationInfo[1]; mmboi[0] = new ModelMBeanOperationInfo("getManagedObject", "Get the Shared Class Loader", null, ClassLoader.class.getName(), ModelMBeanOperationInfo.INFO); return new ModelMBeanInfoSupport(this.getClass().getName(), "Sakai Shared Classloader", mmbai, null, mmboi, null); } /** * Get the shared classloader.. * @see org.sakaiproject.kernel.loader.common.CommonObject#getManagedObject() */ @SuppressWarnings("unchecked") public <T> T getManagedObject() { return (T) sharedClassLoader; } }