/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.plugins.modcluster;
import java.util.HashSet;
import java.util.Set;
import org.mc4j.ems.connection.EmsConnection;
import org.mc4j.ems.connection.bean.EmsBean;
import org.rhq.core.domain.configuration.Configuration;
import org.rhq.core.pluginapi.inventory.DiscoveredResourceDetails;
import org.rhq.core.pluginapi.inventory.ResourceDiscoveryComponent;
import org.rhq.core.pluginapi.inventory.ResourceDiscoveryContext;
import org.rhq.plugins.jmx.MBeanResourceComponent;
import org.rhq.plugins.modcluster.helper.JBossHelper;
import org.rhq.plugins.modcluster.model.ProxyInfo;
/**
* Discovers mod_cluster contexts from the proxyInfo mbean property.
*
* @author Stefan Negrea
*/
public class WebappContextDiscoveryComponent implements ResourceDiscoveryComponent<MBeanResourceComponent<?>> {
private static final String JVM_ROUTE_PROPERTY = "jvmRoute";
private static final String ENGINE_OBJECT_NAME = "engineObjectName";
/* (non-Javadoc)
* @see org.rhq.core.pluginapi.inventory.ResourceDiscoveryComponent#discoverResources(org.rhq.core.pluginapi.inventory.ResourceDiscoveryContext)
*/
public Set<DiscoveredResourceDetails> discoverResources(ResourceDiscoveryContext<MBeanResourceComponent<?>> context) {
String jvmRoute = this.getJvmRoute(context);
EmsBean configBean = context.getParentResourceComponent().getEmsBean();
String rawProxyInfo = JBossHelper.getRawProxyInfo(configBean);
ProxyInfo proxyInfo = new ProxyInfo(rawProxyInfo);
Set<DiscoveredResourceDetails> entities = new HashSet<DiscoveredResourceDetails>();
for (ProxyInfo.Context availableContext : proxyInfo.getAvailableContexts()) {
if (availableContext.getJvmRoute().equals(jvmRoute)) {
DiscoveredResourceDetails detail = new DiscoveredResourceDetails(context.getResourceType(),
availableContext.createKey(), availableContext.createName(), null, "Webapp Context", null, null);
entities.add(detail);
}
}
return entities;
}
/**
* Loads the bean with the given object name.
*
* Subclasses are free to override this method in order to load the bean.
*
* @param objectName the name of the bean to load
* @return the bean that is loaded
*/
protected EmsBean loadBean(MBeanResourceComponent<?> context, String objectName) {
EmsConnection emsConnection = context.getEmsConnection();
if (emsConnection != null) {
EmsBean bean = emsConnection.getBean(objectName);
if (bean == null) {
// In some cases, this resource component may have been discovered by some means other than querying its
// parent's EMSConnection (e.g. ApplicationDiscoveryComponent uses a filesystem to discover EARs and
// WARs that are not yet deployed). In such cases, getBean() will return null, since EMS won't have the
// bean in its cache. To cover such cases, make an attempt to query the underlying MBeanServer for the
// bean before giving up.
emsConnection.queryBeans(objectName);
bean = emsConnection.getBean(objectName);
}
return bean;
}
return null;
}
/**
* Retrieves the jvm route for the node from the parent context.
*
* @param context the discovery context
* @return node's jvm route
*/
private String getJvmRoute(ResourceDiscoveryContext<MBeanResourceComponent<?>> context) {
Configuration pluginConfig = context.getParentResourceComponent().getResourceContext().getPluginConfiguration();
String[] engineObjectNames = pluginConfig.getSimple(ENGINE_OBJECT_NAME).getStringValue().split("\\|");
for (String engineObjectName : engineObjectNames) {
EmsBean engineBean = this.loadBean(context.getParentResourceComponent(), engineObjectName);
if (engineBean != null) {
return engineBean.getAttribute(JVM_ROUTE_PROPERTY).refresh().toString();
}
}
return null;
}
}