Java tutorial
/* * RHQ Management Platform * Copyright (C) 2005-2011 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.modules.plugins.jbossas7; import java.util.ArrayList; import java.util.Arrays; import java.util.HashSet; import java.util.List; import java.util.Set; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.codehaus.jackson.map.DeserializationConfig; import org.codehaus.jackson.map.ObjectMapper; import org.rhq.core.domain.configuration.Configuration; import org.rhq.core.domain.configuration.PropertySimple; import org.rhq.core.pluginapi.inventory.DiscoveredResourceDetails; import org.rhq.core.pluginapi.inventory.ResourceDiscoveryComponent; import org.rhq.core.pluginapi.inventory.ResourceDiscoveryContext; import org.rhq.modules.plugins.jbossas7.json.Address; import org.rhq.modules.plugins.jbossas7.json.ReadChildrenNames; import org.rhq.modules.plugins.jbossas7.json.ReadResource; import org.rhq.modules.plugins.jbossas7.json.Result; /** * Discover subsystems. We need to distinguish two cases denoted by the path * plugin config: * <ul> * <li>Path is a single 'word': here the value denotes a key in the resource path * of AS7, that identifies a child type see e.g. the Connectors below the JBossWeb * service in the plugin descriptor. There can be multiple resources of the given * type. In addition it is possible that a path entry in configuration shares multiple * types that are separated by the pipe symbol.</li> * <li>Path is a key-value pair (e.g. subsystem=web ). This denotes a singleton * subsystem with a fixes path within AS7 (perhaps below another resource in the * tree.</li> * </ul> * * @author Heiko W. Rupp */ public class SubsystemDiscovery implements ResourceDiscoveryComponent<BaseComponent<?>> { private final Log log = LogFactory.getLog(this.getClass()); public Set<DiscoveredResourceDetails> discoverResources(ResourceDiscoveryContext<BaseComponent<?>> context) throws Exception { Set<DiscoveredResourceDetails> details = new HashSet<DiscoveredResourceDetails>(); ObjectMapper mapper = new ObjectMapper(); mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false); mapper.configure(DeserializationConfig.Feature.READ_ENUMS_USING_TO_STRING, true); BaseComponent parentComponent = context.getParentResourceComponent(); ASConnection connection = parentComponent.getASConnection(); Configuration config = context.getDefaultPluginConfiguration(); String confPath = config.getSimpleValue("path", ""); if (confPath == null || confPath.isEmpty()) { log.error("Path plugin config is null for ResourceType [" + context.getResourceType().getName() + "]."); return details; } boolean lookForChildren = false; if (!confPath.contains("=")) { // NO = -> no sub path, but a type lookForChildren = true; } // Construct the full path including the parent String path; String parentPath = parentComponent.getPath(); if (parentPath == null || parentPath.isEmpty()) path = ""; else path = parentPath; if (Boolean.getBoolean("as7plugin.verbose")) log.info("total path: [" + path + "]"); if (lookForChildren) { // Looking for multiple resource of type 'childType' // check if there are multiple types are present List<String> subTypes = new ArrayList<String>(); if (confPath.contains("|")) { subTypes.addAll(Arrays.asList(confPath.split("\\|"))); } else subTypes.add(confPath); for (String cpath : subTypes) { Address addr = new Address(parentPath); Result result = connection.execute(new ReadChildrenNames(addr, cpath)); if (result.isSuccess()) { @SuppressWarnings("unchecked") List<String> subsystems = (List<String>) result.getResult(); // There may be multiple children of the given type for (String val : subsystems) { String newPath = cpath + "=" + val; Configuration config2 = context.getDefaultPluginConfiguration(); String resKey; if (path == null || path.isEmpty()) resKey = newPath; else { if (path.startsWith(",")) path = path.substring(1); resKey = path + "," + cpath + "=" + val; } PropertySimple pathProp = new PropertySimple("path", resKey); config2.put(pathProp); DiscoveredResourceDetails detail = new DiscoveredResourceDetails(context.getResourceType(), // DataType resKey, // Key val, // Name null, // Version context.getResourceType().getDescription(), // subsystem.description config2, null); details.add(detail); } } } } else { // Single subsystem path += "," + confPath; if (path.startsWith(",")) path = path.substring(1); Result result = connection.execute(new ReadResource(new Address(path))); if (result.isSuccess()) { String resKey = path; String name = resKey.substring(resKey.lastIndexOf("=") + 1); Configuration config2 = context.getDefaultPluginConfiguration(); PropertySimple pathProp = new PropertySimple("path", path); config2.put(pathProp); DiscoveredResourceDetails detail = new DiscoveredResourceDetails(context.getResourceType(), // DataType path, // Key name, // Name null, // Version context.getResourceType().getDescription(), // Description config2, null); details.add(detail); } } return details; } }